Magazine et Edition

Volume 26 (2022): Edition 1 (June 2022)

Volume 25 (2021): Edition 2 (December 2021)

Volume 25 (2021): Edition 1 (June 2021)

Volume 24 (2020): Edition 2 (December 2020)

Volume 24 (2020): Edition 1 (June 2020)

Volume 23 (2019): Edition 2 (December 2019)

Volume 23 (2019): Edition 1 (June 2019)

Volume 22 (2018): Edition 2 (December 2018)

Volume 22 (2018): Edition 1 (August 2018)

Volume 21 (2017): Edition 2 (December 2017)

Volume 21 (2017): Edition 1 (June 2017)

Volume 20 (2016): Edition 2 (December 2016)

Volume 20 (2016): Edition 1 (June 2016)

Volume 19 (2015): Edition 2 (December 2015)

Volume 19 (2015): Edition 1 (July 2015)

Volume 18 (2014): Edition 2 (December 2014)

Volume 18 (2014): Edition 1 (June 2014)

Volume 17 (2013): Edition 2 (December 2013)

Volume 17 (2013): Edition 1 (June 2013)

Détails du magazine
Format
Magazine
eISSN
2344-150X
Première publication
30 Jul 2013
Période de publication
2 fois par an
Langues
Anglais

Chercher

Volume 23 (2019): Edition 2 (December 2019)

Détails du magazine
Format
Magazine
eISSN
2344-150X
Première publication
30 Jul 2013
Période de publication
2 fois par an
Langues
Anglais

Chercher

14 Articles
access type Accès libre

Screening and Identification of New Types of Exopolysaccharides-Producing Lactic Acid in the Inner Mongolia Dairy Products

Publié en ligne: 30 Dec 2019
Pages: 75 - 84

Résumé

Abstract

Exopolysaccharides (EPS) is a type of polysaccharide produced by lactic acid bacteria (LAB) that can be directly used in foods to make the products more excellent. Therefore, batch studies were performed to explore the effect of different LAB on the production of EPS and antioxidant activity. Five strains with high EPS yield and antioxidant activity were screened out from 66 strains isolated from Tibetan dairy products. The results show that EPS produntion of the five strains (B55, B62, B30, 7830 and K2) were 110.66, 145.48, 132.78, 122.11 and 111.72 mg·L−1, respectively, and they have a higher DPPH free radical scavenging activity (56.29, 66.43, 62.94, 68.71, 61.87%). Five LAB strains were identified and classified based on screening, purification and 16S rDNA sequences. Molecular characterization based on partial sequence 16S rDNA homology confirmed the initial identification as Lactobacillus fermentum (B55, B62), Lactobacillus plantarum (7830), Pediococcus acidilactici (B30) and Lactobacillus helveticus (K2).

Mots clés

  • Exopolysaccharides
  • lactic acid bacteria
  • DPPH radical scavenging activity
  • Phylogenetic tree
access type Accès libre

Screening and Identification of Biosurfactant-Producing Lactic Acid Bacteria

Publié en ligne: 30 Dec 2019
Pages: 85 - 92

Résumé

Abstract

Biosurfactant attracts people’s attention because of its advantages of green and low toxicity. Lactic acid bacteria are beneficial to human and animal health. In order to make the application of surfactants safer, SDS standard curve was established, 65 strains of Lactic acid bacteria were used as screening source, and oil expanding circle was used as index to screen the strain with strong surfactant production capacity. The results showed that the standard curve of SDS was Y=34.82+(-1495.97) X1+33.11X2, and all strains had the ability to produce surfactants. Surface activity varied with bacteria. The concentration of surface activity ranged from 111.15mg/L to 736.23 mg/L. The concentration of BS in supernatant of LB6, 49, F70, 20 and Y1 strains was selected for screening. The concentration of BS in supernatant was 561.01~935.77 mg/L, and the concentration of BS on cell surface was 401.67~1076.94 mg/L. Considering the highest BS-producing strain is F70, the result of 16SrDNA showed that the strain is Pediococcus acidilactici F70. This experiment provides basic data for the production of surfactants by Lactic acid bacteria.

Mots clés

  • biosurfactant
  • Lactic acid bacteria
  • oil expanding circle
access type Accès libre

Application of Plackett-Burman Design in Screening Casein and Prebiotics for the Production of ACE Inhibitory Peptides from Cow Milk Fermented by L. bulgaricus LB6

Publié en ligne: 30 Dec 2019
Pages: 93 - 100

Résumé

Abstract

Prebiotics can play an important role in functional foods. In this paper, casein and five probiotics were selected to study the effects on ACE inhibitory peptides in fermented milk of L. bulgaricus LB6 through Plackett-Burman design, so as to improve the production of ACE inhibitory peptides. The results showed that xylooligosaccharides (XOS), fructosaccharide (FOS) and inulin had the most significant effect on the yield of ACE inhibitory peptides. Optimization added the amount of the three prebiotics added, that is, the amount of XOS added was 0.7%, the amount of FOS added was 1.1%, and the amount of inulin added was 0.7%. It provides a basis for subsequent optimization experiments.

Mots clés

  • ACE inhibition rate
  • Prebiotics
  • Plackett-Burman design
access type Accès libre

Effect of Carbon Sources, Nitrogen Sources and Prebiotics on Growth of Saccharomyces Boulardii

Publié en ligne: 30 Dec 2019
Pages: 101 - 108

Résumé

Abstract

Saccharomyces boulardii (S. boulardii) has been used as a probiotic for the prevention or treatment of various human gastrointestinal diseases for many years. Thus, S. boulardii has a wide range of application prospects in medicine and food industry. The experiments were investigated with effecting of carbon sources (galactose, sucrose, fructose, maltose, lactose, glucose, and soluble starch), nitrogen sources (tryptone, casein, yeast extract, peptone, soy peptone, beef extract and malted milk; ammonium sulfate, urea, diammonium hydrogen citrate, triammonium citrate, ammonium nitrate, ammonium chloride and potassium nitrate), prebiotics (xylo-oligosaccharide, isomaltooligosaccharide, fructo-oligosaccharide, galacto-oligosaccharide, stachyose, raffinose and inulin) on the number of viable cells and dry cell weight of S. boulardii. The optimum concentration of 5 % glucose or sucrose, 2 % peptone or yeast extract, 0.4 % urea, 0.2 % fructo-oligosaccharide and 0.6 % galacto-oligosaccharide for S. boulardii grew better in medium.

Mots clés

  • carbon source
  • nitrogen source
  • prebiotics
access type Accès libre

A Closed Model for Energy Independent Production System in Cacao Processing Industry

Publié en ligne: 30 Dec 2019
Pages: 109 - 120

Résumé

Abstract

The objective of this research was to assess energy independent and develop a model of closed system production process of cocoa butter and cocoa powder. Mass balance analysis and potential energy assessment of byproducts were used to develop the closed system of cacao processing industry. The results showed that cacao industry with 4,500 kg of cacao capacity per day has the potential energy of 14,561,290 k cal per day derived from the pod husk and bean shells. This potential energy meets the energy needs for the production process. This study explained that the cacao industry can be developed to be an energy independent industry by using the by-products for energy source.

Mots clés

  • cacao processing industry
  • energy independent
  • closed production system
access type Accès libre

Carbon Dioxide Injury Prediction Model for Fresh-Cut Apples

Publié en ligne: 30 Dec 2019
Pages: 121 - 128

Résumé

Abstract

Carbon dioxide (CO2) injury is one of the key cause affecting the sales of fresh-cut apples during the sales period. The method to warn the time till occurring CO2 injury would be convenient for businesses and consumers, but so far, no one has paid attention. This research aimed to study the change rule of the mechanism of carbon dioxide injury of fresh-cut apples treated with high CO2 concentration. The experiment was conducted at 5, 15, 25 and 35°C for 4 days. Every twelve hours, the fresh-cut apple was analyzed by measuring the changes of firmness, soluble solids concentration, browning index and sensory evaluation. The results showed that sensory scores, firmness and soluble solids concentration decreased over time, while the browning index of freshly cut apple increased rapidly with time. Based on the dynamic model of the browning index, with the CO2 Injury warning model of ready-to-eat apples treated with high CO2 concentration was determined.

Mots clés

  • High carbon dioxide
  • Carbon dioxide injury
  • Fresh-cut apple
  • Injury prediction model
access type Accès libre

Physicochemical Characteristics and Nutritional Compositions of Some Date (Phoenix dactylifera L.) Fruit Cultivars

Publié en ligne: 30 Dec 2019
Pages: 129 - 138

Résumé

Abstract

A comparative study was carried out for eight mature date fruit cultivars to assess physicochemical and nutritional values. Results showed that fruit and flesh weights and seed sizes indicated wide diversity among studied cultivars. The highest pH, acidity, and ash levels were obtained from Tazizaout and Oukasaba cultivars; protein contents varied from 0.47 (Tazizaout) to 0.31 g/100g DM (Delat), while free amino acids concentrations were found between 1.47 (Oukasaba) and 0.79 g/100g DM (Tazarzeit). Total carbohydrates were ranged from 96.28 to 84.51 g/100g DM. The date is low in fat, the highest concentration was 0.11 g/100g DM. Principal Component Analysis indicated that Ourous and Delat cultivars have specific characteristics and can be distinguished from the other cultivars.

Mots clés

  • Date palm
  • cultivar
  • physicochemical characteristic
  • nutritional composition
  • biodiversity
access type Accès libre

Quality Evaluation of Tigernut Milk-Based Popsicles Produced with Date Palm Fruits as Sweetener

Publié en ligne: 30 Dec 2019
Pages: 139 - 146

Résumé

Abstract

Popsicle is a flavored and edible ice on stick that can be produced with dairy products. This study aimed to investigate the possibility of using milk from tigernut as a non-dairy source and date palm fruits as sweetener for producing popsicles with enhanced bioactive properties and acceptability. Tigernut milk-based popsicles sweetened with sugar, unroasted date or roasted date were made. The physical properties, antioxidant activity, total phenolic content, melting rate, and sensory characteristics were evaluated. The roasting process significantly influenced the total phenol, antioxidant activity and sensory characteristics of the popsicles. Melting resistance was higher in the popsicles containing both the roasted and unroasted dates compared to the sugar sweetened popsicles. Popsicles sweetened with roasted dates exhibited the most acceptable sensory properties in terms of flavour, taste and overall acceptability.

Mots clés

  • Popsicles
  • Roasted date
  • Antioxidant capacity
  • Tigernut milk
  • Melting rate
access type Accès libre

Chemical and Sensory Properties of Probioticated Drinks from Blends of African Yam Bean, Soybean and Coconut Milk Analogues

Publié en ligne: 30 Dec 2019
Pages: 147 - 156

Résumé

Abstract

This study assessed the physicochemical and sensory properties of ‘probiotic’ drink from blends of milk analogues from African yam bean, soybean and coconut. Milk analogues were blended at ratios of 1:1:1, 3:1:1 and 5:1:1 (African yam bean: soybean: coconut) as samples A, B and C respectively. These samples were fermented for 24 h at 43°C using Lactobacillus delbrueckii. The results showed that the fermented milk analogue of ratio 1:1:1 was the most acceptable in terms of sensory parameters. The pH of the milk analogues ranged from 5.07 to 5.85. The sample B1 (fermented (1:1:1) African yam bean: soybean: coconut) had a crude protein of 2.38%, potassium of 80.13 mg/100g, phytate of 2.85 mg/100g and saponin was 0.19 mg/100g. The study concluded that the sample with equal ratio of African yam bean, soybean and coconut adjudged the most acceptable by tasters.

Mots clés

  • milk analogues
  • phytate
  • reducing sugar
access type Accès libre

Sweet Cherry Skin Colour Measurement as an Non-Destructive Indicator of Fruit Maturity

Publié en ligne: 30 Dec 2019
Pages: 157 - 166

Résumé

Abstract

Colour measurement is one of the methods used to evaluate food quality. Aim of completed research was the evaluation of a fast and non-destructive method which consisted of assessing colour changes. It was used to determine the ripeness of cherries during their harvest. Additionally, the most significant parameter determining fruit ripeness was identified. Colour measurements of the Burlat cherry on the PHL A rootstocks were supposed to provide standards for practical evaluation of fruit ripeness of this species at an orchard. During the research, the measurements concerned the internal quality of the cherry fruit (firmness, extract content) and the force required to tear off the stem, depending on the size of the fruit. The extract appeared to be the most important indicator to be used for the determination of an optimum harvesting period. It was most prominently correlated with the cherry’s colour. Changes in the skin colour were the most reflected by the value of the parameter CIE a*. The coordinates CIE L* and b* are also important for the determination of fruit quality. Burlat cherries achieve their optimum harvesting ripeness if the coordinate a* is within the range 30.0 to 0.0, the coordinate b* within 10.0 to 0.0 and the coordinate L* within 30.0 to 20.0, which corresponds to the extract value of 12-20%.

Mots clés

  • CIEL*a*b*
  • dimensionality reduction
  • classification
  • harvesting date
  • fruit quality
  • L
access type Accès libre

Physicochemical and Biochemical Properties of Ground Pork Formulated with Addition of Prunus cerasus (cv Montmorency) Extract and Subjected to Freezing Storage

Publié en ligne: 30 Dec 2019
Pages: 167 - 178

Résumé

Abstract

Broad research interest is observed over last decade, toward searching for a new natural antioxidants, which could be applied in food industry. Especially attractive seems to be those rich in polyphenols, such as cherry. Thus, presented study determine the effect of cherry extract (equivalent of 20 mg and 40 mg GAE kg−1) on physicochemical properties of ground pork frozen for 80 days. Samples were analyzed for color, color change, color attractiveness, myoglobin oxidation, fat oxidation, fatty acids profile, cooking loss, texture profile. The positive effect of cherry extract was observed for fat oxidation but cooking loss was higher in samples with extract addition. Color, color change, color attractiveness, myoglobin oxidation or fatty acids profile did not differ between groups.

Mots clés

  • pork
  • cherry extract
  • polyphenols
  • freezing storage
access type Accès libre

Nutritional Evaluation of Fermented, Germinated and Roasted Pumpkin (Cucurbita maxima) Seed Flour

Publié en ligne: 30 Dec 2019
Pages: 179 - 186

Résumé

Abstract

Freshly harvested pumpkin seed was processed into flour namely; raw (RPSF), fermented (FPSF), germinated (GPSF) and roasted (ROPSF). Various pumpkin seed flour obtained were investigated for nutritional properties using standard methods. Protein was higher in the fermented flour (35.85%) while the roasted flour (46.31%) possessed the highest fat content. Results obtained from processed pumpkin seed flour further revealed that glutamic acid (10.45-13.02 g/100g) and linoleic acid (134.72-419.70 µg/ml) were the most abundant amino acid and fatty acid, respectively. Processed pumpkin seed flour contained appreciable amount of minerals and demonstrated very good functional properties. It can be concluded that subjecting pumpkin seed to various processing methods enhanced its nutritional properties and may find application in food industry.

Mots clés

  • Pumpkin seed
  • fermentation
  • germination
  • roasting
  • nutritional evaluation
access type Accès libre

Study on the Effects of Lemon Juice on Chemical and Functional Properties of Some Fruit Juices

Publié en ligne: 30 Dec 2019
Pages: 187 - 192

Résumé

Abstract

Natural antioxidants from fruit juices have been interesting in terms of safety and low risk of side effects. Lemon juice was added to apple, grape, orange, pineapple and watermelon juices to obtain various concentrations. The blends were assayed for total phenolic content and total antioxidant capacity as well as superoxide dismutase (SOD)-like activity. The highest phenolic content was present in 50% (v/v) lemon juice in pineapple blend (425.1±5.1 μg/ml) in comparison to original juice. The total antioxidant capacity and SOD-like activity in the juice blends increased with increasing the proportion of lemon juice when compared with original juice. Our study indicated that lemon juice enhanced health benefits in terms of total phenolic content, total antioxidant capacity and SOD-like activity.

Mots clés

  • Total phenolic content
  • Total antioxidant capacity
  • SOD-like activity
  • Lemon juice
  • Juice blends
access type Accès libre

Obtaining and Characterisation of Starch-Based Edible Films Incorporating Honey, Propolis and Bee Bread

Publié en ligne: 30 Dec 2019
Pages: 193 - 198

Résumé

Abstract

This research investigates the physical-chemical, sensorial and mechanical characteristics of starch-based edible films incorporating three types of bee hive products: honey, propolis and bee bread, in concentrations varying from 1% to 3%, reported to starch. The results indicates an increasing of films moisture, water activity, ash content and acidity, in the order: honey<propolis<bee bread, all values increasing with the increasing of hive products percentage into the control film; aw is remaining at very low values, under 0.4. Sensorial analysis indicated honey as the better suited for improving taste and flavour and bee bread for increasing colour intensity of the films; the sensorial characteristics are maintained during 30 days of films storage, in all cases. Compared with the control starch-based film (which is elastic, brittle and hard), the films containing 2% bee hive products are elasto-plastic and more resistant to penetration, the resistance increasing in the order: bee bread<propolis<honey.

Mots clés

  • edible film
  • starch
  • honey
  • propolis
  • bee bread
14 Articles
access type Accès libre

Screening and Identification of New Types of Exopolysaccharides-Producing Lactic Acid in the Inner Mongolia Dairy Products

Publié en ligne: 30 Dec 2019
Pages: 75 - 84

Résumé

Abstract

Exopolysaccharides (EPS) is a type of polysaccharide produced by lactic acid bacteria (LAB) that can be directly used in foods to make the products more excellent. Therefore, batch studies were performed to explore the effect of different LAB on the production of EPS and antioxidant activity. Five strains with high EPS yield and antioxidant activity were screened out from 66 strains isolated from Tibetan dairy products. The results show that EPS produntion of the five strains (B55, B62, B30, 7830 and K2) were 110.66, 145.48, 132.78, 122.11 and 111.72 mg·L−1, respectively, and they have a higher DPPH free radical scavenging activity (56.29, 66.43, 62.94, 68.71, 61.87%). Five LAB strains were identified and classified based on screening, purification and 16S rDNA sequences. Molecular characterization based on partial sequence 16S rDNA homology confirmed the initial identification as Lactobacillus fermentum (B55, B62), Lactobacillus plantarum (7830), Pediococcus acidilactici (B30) and Lactobacillus helveticus (K2).

Mots clés

  • Exopolysaccharides
  • lactic acid bacteria
  • DPPH radical scavenging activity
  • Phylogenetic tree
access type Accès libre

Screening and Identification of Biosurfactant-Producing Lactic Acid Bacteria

Publié en ligne: 30 Dec 2019
Pages: 85 - 92

Résumé

Abstract

Biosurfactant attracts people’s attention because of its advantages of green and low toxicity. Lactic acid bacteria are beneficial to human and animal health. In order to make the application of surfactants safer, SDS standard curve was established, 65 strains of Lactic acid bacteria were used as screening source, and oil expanding circle was used as index to screen the strain with strong surfactant production capacity. The results showed that the standard curve of SDS was Y=34.82+(-1495.97) X1+33.11X2, and all strains had the ability to produce surfactants. Surface activity varied with bacteria. The concentration of surface activity ranged from 111.15mg/L to 736.23 mg/L. The concentration of BS in supernatant of LB6, 49, F70, 20 and Y1 strains was selected for screening. The concentration of BS in supernatant was 561.01~935.77 mg/L, and the concentration of BS on cell surface was 401.67~1076.94 mg/L. Considering the highest BS-producing strain is F70, the result of 16SrDNA showed that the strain is Pediococcus acidilactici F70. This experiment provides basic data for the production of surfactants by Lactic acid bacteria.

Mots clés

  • biosurfactant
  • Lactic acid bacteria
  • oil expanding circle
access type Accès libre

Application of Plackett-Burman Design in Screening Casein and Prebiotics for the Production of ACE Inhibitory Peptides from Cow Milk Fermented by L. bulgaricus LB6

Publié en ligne: 30 Dec 2019
Pages: 93 - 100

Résumé

Abstract

Prebiotics can play an important role in functional foods. In this paper, casein and five probiotics were selected to study the effects on ACE inhibitory peptides in fermented milk of L. bulgaricus LB6 through Plackett-Burman design, so as to improve the production of ACE inhibitory peptides. The results showed that xylooligosaccharides (XOS), fructosaccharide (FOS) and inulin had the most significant effect on the yield of ACE inhibitory peptides. Optimization added the amount of the three prebiotics added, that is, the amount of XOS added was 0.7%, the amount of FOS added was 1.1%, and the amount of inulin added was 0.7%. It provides a basis for subsequent optimization experiments.

Mots clés

  • ACE inhibition rate
  • Prebiotics
  • Plackett-Burman design
access type Accès libre

Effect of Carbon Sources, Nitrogen Sources and Prebiotics on Growth of Saccharomyces Boulardii

Publié en ligne: 30 Dec 2019
Pages: 101 - 108

Résumé

Abstract

Saccharomyces boulardii (S. boulardii) has been used as a probiotic for the prevention or treatment of various human gastrointestinal diseases for many years. Thus, S. boulardii has a wide range of application prospects in medicine and food industry. The experiments were investigated with effecting of carbon sources (galactose, sucrose, fructose, maltose, lactose, glucose, and soluble starch), nitrogen sources (tryptone, casein, yeast extract, peptone, soy peptone, beef extract and malted milk; ammonium sulfate, urea, diammonium hydrogen citrate, triammonium citrate, ammonium nitrate, ammonium chloride and potassium nitrate), prebiotics (xylo-oligosaccharide, isomaltooligosaccharide, fructo-oligosaccharide, galacto-oligosaccharide, stachyose, raffinose and inulin) on the number of viable cells and dry cell weight of S. boulardii. The optimum concentration of 5 % glucose or sucrose, 2 % peptone or yeast extract, 0.4 % urea, 0.2 % fructo-oligosaccharide and 0.6 % galacto-oligosaccharide for S. boulardii grew better in medium.

Mots clés

  • carbon source
  • nitrogen source
  • prebiotics
access type Accès libre

A Closed Model for Energy Independent Production System in Cacao Processing Industry

Publié en ligne: 30 Dec 2019
Pages: 109 - 120

Résumé

Abstract

The objective of this research was to assess energy independent and develop a model of closed system production process of cocoa butter and cocoa powder. Mass balance analysis and potential energy assessment of byproducts were used to develop the closed system of cacao processing industry. The results showed that cacao industry with 4,500 kg of cacao capacity per day has the potential energy of 14,561,290 k cal per day derived from the pod husk and bean shells. This potential energy meets the energy needs for the production process. This study explained that the cacao industry can be developed to be an energy independent industry by using the by-products for energy source.

Mots clés

  • cacao processing industry
  • energy independent
  • closed production system
access type Accès libre

Carbon Dioxide Injury Prediction Model for Fresh-Cut Apples

Publié en ligne: 30 Dec 2019
Pages: 121 - 128

Résumé

Abstract

Carbon dioxide (CO2) injury is one of the key cause affecting the sales of fresh-cut apples during the sales period. The method to warn the time till occurring CO2 injury would be convenient for businesses and consumers, but so far, no one has paid attention. This research aimed to study the change rule of the mechanism of carbon dioxide injury of fresh-cut apples treated with high CO2 concentration. The experiment was conducted at 5, 15, 25 and 35°C for 4 days. Every twelve hours, the fresh-cut apple was analyzed by measuring the changes of firmness, soluble solids concentration, browning index and sensory evaluation. The results showed that sensory scores, firmness and soluble solids concentration decreased over time, while the browning index of freshly cut apple increased rapidly with time. Based on the dynamic model of the browning index, with the CO2 Injury warning model of ready-to-eat apples treated with high CO2 concentration was determined.

Mots clés

  • High carbon dioxide
  • Carbon dioxide injury
  • Fresh-cut apple
  • Injury prediction model
access type Accès libre

Physicochemical Characteristics and Nutritional Compositions of Some Date (Phoenix dactylifera L.) Fruit Cultivars

Publié en ligne: 30 Dec 2019
Pages: 129 - 138

Résumé

Abstract

A comparative study was carried out for eight mature date fruit cultivars to assess physicochemical and nutritional values. Results showed that fruit and flesh weights and seed sizes indicated wide diversity among studied cultivars. The highest pH, acidity, and ash levels were obtained from Tazizaout and Oukasaba cultivars; protein contents varied from 0.47 (Tazizaout) to 0.31 g/100g DM (Delat), while free amino acids concentrations were found between 1.47 (Oukasaba) and 0.79 g/100g DM (Tazarzeit). Total carbohydrates were ranged from 96.28 to 84.51 g/100g DM. The date is low in fat, the highest concentration was 0.11 g/100g DM. Principal Component Analysis indicated that Ourous and Delat cultivars have specific characteristics and can be distinguished from the other cultivars.

Mots clés

  • Date palm
  • cultivar
  • physicochemical characteristic
  • nutritional composition
  • biodiversity
access type Accès libre

Quality Evaluation of Tigernut Milk-Based Popsicles Produced with Date Palm Fruits as Sweetener

Publié en ligne: 30 Dec 2019
Pages: 139 - 146

Résumé

Abstract

Popsicle is a flavored and edible ice on stick that can be produced with dairy products. This study aimed to investigate the possibility of using milk from tigernut as a non-dairy source and date palm fruits as sweetener for producing popsicles with enhanced bioactive properties and acceptability. Tigernut milk-based popsicles sweetened with sugar, unroasted date or roasted date were made. The physical properties, antioxidant activity, total phenolic content, melting rate, and sensory characteristics were evaluated. The roasting process significantly influenced the total phenol, antioxidant activity and sensory characteristics of the popsicles. Melting resistance was higher in the popsicles containing both the roasted and unroasted dates compared to the sugar sweetened popsicles. Popsicles sweetened with roasted dates exhibited the most acceptable sensory properties in terms of flavour, taste and overall acceptability.

Mots clés

  • Popsicles
  • Roasted date
  • Antioxidant capacity
  • Tigernut milk
  • Melting rate
access type Accès libre

Chemical and Sensory Properties of Probioticated Drinks from Blends of African Yam Bean, Soybean and Coconut Milk Analogues

Publié en ligne: 30 Dec 2019
Pages: 147 - 156

Résumé

Abstract

This study assessed the physicochemical and sensory properties of ‘probiotic’ drink from blends of milk analogues from African yam bean, soybean and coconut. Milk analogues were blended at ratios of 1:1:1, 3:1:1 and 5:1:1 (African yam bean: soybean: coconut) as samples A, B and C respectively. These samples were fermented for 24 h at 43°C using Lactobacillus delbrueckii. The results showed that the fermented milk analogue of ratio 1:1:1 was the most acceptable in terms of sensory parameters. The pH of the milk analogues ranged from 5.07 to 5.85. The sample B1 (fermented (1:1:1) African yam bean: soybean: coconut) had a crude protein of 2.38%, potassium of 80.13 mg/100g, phytate of 2.85 mg/100g and saponin was 0.19 mg/100g. The study concluded that the sample with equal ratio of African yam bean, soybean and coconut adjudged the most acceptable by tasters.

Mots clés

  • milk analogues
  • phytate
  • reducing sugar
access type Accès libre

Sweet Cherry Skin Colour Measurement as an Non-Destructive Indicator of Fruit Maturity

Publié en ligne: 30 Dec 2019
Pages: 157 - 166

Résumé

Abstract

Colour measurement is one of the methods used to evaluate food quality. Aim of completed research was the evaluation of a fast and non-destructive method which consisted of assessing colour changes. It was used to determine the ripeness of cherries during their harvest. Additionally, the most significant parameter determining fruit ripeness was identified. Colour measurements of the Burlat cherry on the PHL A rootstocks were supposed to provide standards for practical evaluation of fruit ripeness of this species at an orchard. During the research, the measurements concerned the internal quality of the cherry fruit (firmness, extract content) and the force required to tear off the stem, depending on the size of the fruit. The extract appeared to be the most important indicator to be used for the determination of an optimum harvesting period. It was most prominently correlated with the cherry’s colour. Changes in the skin colour were the most reflected by the value of the parameter CIE a*. The coordinates CIE L* and b* are also important for the determination of fruit quality. Burlat cherries achieve their optimum harvesting ripeness if the coordinate a* is within the range 30.0 to 0.0, the coordinate b* within 10.0 to 0.0 and the coordinate L* within 30.0 to 20.0, which corresponds to the extract value of 12-20%.

Mots clés

  • CIEL*a*b*
  • dimensionality reduction
  • classification
  • harvesting date
  • fruit quality
  • L
access type Accès libre

Physicochemical and Biochemical Properties of Ground Pork Formulated with Addition of Prunus cerasus (cv Montmorency) Extract and Subjected to Freezing Storage

Publié en ligne: 30 Dec 2019
Pages: 167 - 178

Résumé

Abstract

Broad research interest is observed over last decade, toward searching for a new natural antioxidants, which could be applied in food industry. Especially attractive seems to be those rich in polyphenols, such as cherry. Thus, presented study determine the effect of cherry extract (equivalent of 20 mg and 40 mg GAE kg−1) on physicochemical properties of ground pork frozen for 80 days. Samples were analyzed for color, color change, color attractiveness, myoglobin oxidation, fat oxidation, fatty acids profile, cooking loss, texture profile. The positive effect of cherry extract was observed for fat oxidation but cooking loss was higher in samples with extract addition. Color, color change, color attractiveness, myoglobin oxidation or fatty acids profile did not differ between groups.

Mots clés

  • pork
  • cherry extract
  • polyphenols
  • freezing storage
access type Accès libre

Nutritional Evaluation of Fermented, Germinated and Roasted Pumpkin (Cucurbita maxima) Seed Flour

Publié en ligne: 30 Dec 2019
Pages: 179 - 186

Résumé

Abstract

Freshly harvested pumpkin seed was processed into flour namely; raw (RPSF), fermented (FPSF), germinated (GPSF) and roasted (ROPSF). Various pumpkin seed flour obtained were investigated for nutritional properties using standard methods. Protein was higher in the fermented flour (35.85%) while the roasted flour (46.31%) possessed the highest fat content. Results obtained from processed pumpkin seed flour further revealed that glutamic acid (10.45-13.02 g/100g) and linoleic acid (134.72-419.70 µg/ml) were the most abundant amino acid and fatty acid, respectively. Processed pumpkin seed flour contained appreciable amount of minerals and demonstrated very good functional properties. It can be concluded that subjecting pumpkin seed to various processing methods enhanced its nutritional properties and may find application in food industry.

Mots clés

  • Pumpkin seed
  • fermentation
  • germination
  • roasting
  • nutritional evaluation
access type Accès libre

Study on the Effects of Lemon Juice on Chemical and Functional Properties of Some Fruit Juices

Publié en ligne: 30 Dec 2019
Pages: 187 - 192

Résumé

Abstract

Natural antioxidants from fruit juices have been interesting in terms of safety and low risk of side effects. Lemon juice was added to apple, grape, orange, pineapple and watermelon juices to obtain various concentrations. The blends were assayed for total phenolic content and total antioxidant capacity as well as superoxide dismutase (SOD)-like activity. The highest phenolic content was present in 50% (v/v) lemon juice in pineapple blend (425.1±5.1 μg/ml) in comparison to original juice. The total antioxidant capacity and SOD-like activity in the juice blends increased with increasing the proportion of lemon juice when compared with original juice. Our study indicated that lemon juice enhanced health benefits in terms of total phenolic content, total antioxidant capacity and SOD-like activity.

Mots clés

  • Total phenolic content
  • Total antioxidant capacity
  • SOD-like activity
  • Lemon juice
  • Juice blends
access type Accès libre

Obtaining and Characterisation of Starch-Based Edible Films Incorporating Honey, Propolis and Bee Bread

Publié en ligne: 30 Dec 2019
Pages: 193 - 198

Résumé

Abstract

This research investigates the physical-chemical, sensorial and mechanical characteristics of starch-based edible films incorporating three types of bee hive products: honey, propolis and bee bread, in concentrations varying from 1% to 3%, reported to starch. The results indicates an increasing of films moisture, water activity, ash content and acidity, in the order: honey<propolis<bee bread, all values increasing with the increasing of hive products percentage into the control film; aw is remaining at very low values, under 0.4. Sensorial analysis indicated honey as the better suited for improving taste and flavour and bee bread for increasing colour intensity of the films; the sensorial characteristics are maintained during 30 days of films storage, in all cases. Compared with the control starch-based film (which is elastic, brittle and hard), the films containing 2% bee hive products are elasto-plastic and more resistant to penetration, the resistance increasing in the order: bee bread<propolis<honey.

Mots clés

  • edible film
  • starch
  • honey
  • propolis
  • bee bread

Planifiez votre conférence à distance avec Sciendo