[1. International Coffee Organization, Global Coffee Consumption. The Current State of the Global Coffee Trade. [Online]. Available: http://www.ico.org/monthly_coffee_trade_stats.asp.]Search in Google Scholar
[2. FERNANDES, A. S. et al. 2017. Impacts of discarded coffee waste on human and environmental health. In Ecotoxicology and Environmental Safety, Vol. 141, pp. 30–36.]Search in Google Scholar
[3. HAILE, M. 2015. Biofuel Energy: spent coffee grounds biodiesel, bioethanol and solid fuel. Anchor Academic Publishing, Hamburg, ISBN: 978-3-95489-805-3.]Search in Google Scholar
[4. MARTINEZ-SAEZ, N. et al. 2017. Use of spent coffee grounds as food ingredient in bakery products. Food Chemistry, Vol. 216, pp. 114–122.]Search in Google Scholar
[5. CAMPOS-VEGA, R. et al. 2015. Spent coffee grounds: A review on current research and future prospects. Trends in Food Science & Technology, Vol. 45(1), pp. 24–36.]Search in Google Scholar
[6. BLINOVÁ, L. et al. 2015. Cultivation of microalgae (Chlorella vulgaris) for biodiesel production. Research Papers Faculty Of Materials Science And Technology In Trnava, 23(36), pp. 87–95.]Search in Google Scholar
[7. PHIMSEN, S. et al. 2016. Oil extracted from spent coffee grounds for bio-hydrotreated diesel production. Energy Conversion and Management, Vol. 126, pp. 1028–1036.]Search in Google Scholar
[8. BLINOVÁ, L. et al. 2014. Biodiesel production from waste cooking oil in laboratory scale. Applied Mechanics and Materials, Vol. 448–453, pp. 1656–1659.]Search in Google Scholar
[9. AL-HAMAMRE, Z. et al. 2012. Oil extracted from spent coffee grounds as a renewable source for fatty acid methyl ester manufacturing. Fuel, Vol. 96, pp. 70–76.10.1016/j.fuel.2012.01.023]Open DOISearch in Google Scholar
[10. LIU, Y. et al. 2017. Direct transesterification of spent coffee grounds for biodiesel production. Fuel, Vol. 199, pp. 157–161.]Search in Google Scholar
[11. HAILE, M. 2014. Integrated volarization of spent coffee grounds to biofuels. Biofuel Research Journal, Vol. 2, pp. 65–69.]Search in Google Scholar
[12. PICHAI, E., KRIT, S. 2015. Optimization of solid-to-solvent ratio and time for oil extraction process from spent coffee grounds using response surface methodology. ARPN Journal of Engineering and Applied Sciences, 10(16), pp. 7049–7052.]Search in Google Scholar
[13. MISRA, M. et al. 2008. High quality biodiesel from spent coffee grounds. Clean Technology, pp. 39–42.]Search in Google Scholar
[14. KONDAMUDI, N. et al. 2008. Spent coffee grounds as a versatile source of green energy. Journal of Agricultural and Food Chemistry, 56(24), pp. 11757–11760.]Search in Google Scholar
[15. CAETANO, N. S. et al. 2012. Valorization of coffee grounds for biodiesel production. Chemical Engineering Transactions, Vol. 26, pp. 267–272.]Search in Google Scholar
[16. PARK, J. et al. 2016. In-situ transesterification of wet spent coffee grounds for sustainable biodiesel production. Bioresource Technology, Vol. 221, pp. 55–60.]Search in Google Scholar
[17. CAETANO, N. S. et al. 2014. Spent coffee grounds for biodiesel production and other applications. Clean Technologies and Environmental Policy, 16(7), pp. 423–1430.]Search in Google Scholar
[18. AHANGARI, B., SARGOLZAEI, J. 2013. Extraction of lipids from spent coffee grounds using organic solvents and supercritical carbon dioxide. Journal of Food Processing and Preservation, 37(5), pp. 1014–1021.]Search in Google Scholar
[19. ROCHA, M. V. P. et al. 2014. Ultrasound-assisted production of biodiesel and ethanol from spent coffee grounds. Bioresource Technology, Vol. 167, pp. 343–348.]Search in Google Scholar
[20. ABDULLAH, M., BULENT KOC, A. 2013. Oil removal from waste coffee grounds using two-phase solvent extraction enhanced with ultrasonication. Renewable Energy, Vol. 50, pp. 965–970.10.1016/j.renene.2012.08.073]Open DOISearch in Google Scholar
[21. CHAIMA, B. 2016. Valorization of waste coffee grounds in to biodiesel: final report. Al Akhawayn University In Ifrane.]Search in Google Scholar
[22. LE, P. T. K. et al. 2017. Extraction and Evaluation the Biological Activities of Oil from Spent Coffee Grounds. Chemical Engineering Transactions, Vol. 56, pp. 1729–1734.]Search in Google Scholar
[23. ARAÚJO, J. M. A., SANDI, D. 2006. Extraction of coffee diterpenes and coffee oil using supercritical carbon dioxide. Food Chemistry, 101(3), pp. 1087–1094.]Search in Google Scholar
[24. DE AZEVEDO, Á. B. A. et al. 2008. Supercritical CO2 recovery of caffeine form green coffee oil: new experimental solubility data and modeling. Quim. Nova, 31(6), pp. 1319–1323.]Search in Google Scholar
[25. COUTO, R. M. et al. 2009. Supercritical fluid extraction of lipids from spent coffee grounds. Journal of Supercritical Fluids, 51(2), pp. 159–166.10.1016/j.supflu.2009.09.009]Open DOISearch in Google Scholar
[26. DE MELO, M. M. R. et al. 2014. Supercritical fluid extraction of spent coffee grounds: Measurement of extraction curves, oil characterization and economic analysis. Journal of Supercritical Fluids, Vol. 86, pp. 150–159.10.1016/j.supflu.2013.12.016]Open DOISearch in Google Scholar
[27. ANDRADE, K. S. et al. 2012. Supercritical fluid extraction from spent coffee grounds and coffee husks: Antioxidant activity and effect of operational variables on extract composition. Talanta, Vol. 88, pp. 544–552.10.1016/j.talanta.2011.11.031]Open DOISearch in Google Scholar
[28. BLINOVÁ, L. et al. 2016. Types of catalysts used in biodiesel production. Journal of Environmental Protection, Safety, Education and Management, Vol. 4, pp. 17–23.]Search in Google Scholar
[29. ABDULLAH, A. Z. et al. 2007. Critical technical areas for future improvement in biodiesel technologies. In Environmental Research Letters, Vol. 2.]Search in Google Scholar
[30. ZHANG, Y. et al. 2003. Biodiesel production from waste cooking oil: 1. Process design and technological assessment. Bioresource Technology, 89(1), pp. 1–16.10.1016/S0960-8524(03)00040-3]Open DOISearch in Google Scholar
[31. CANAKCI, M., VAN GERPEN, J. 2001. Biodiesel Production From Oils and Fats With High Free Fatty Acids. In Society, 44(6), pp. 1429–1436.]Search in Google Scholar
[32. VARDON, D. R. et al. 2013. Complete utilization of spent coffee grounds to produce biodiesel, bio-oil, and biochar. ACS Sustainable Chemistry and Engineering, Vol. 1, pp. 1286–1294.]Search in Google Scholar