Retraction Note

51st Conference Synthesis and Analysis of Drugs (SAD 2023)

Book of Abstracts 51<sup>st</sup> Conference Synthesis and Analysis of Drugs (SAD 2023) Poster Session

Book of Abstracts 51st Conference Synthesis and Analysis of Drugs (SAD 2023) Oral Presentations

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<p>Aminopeptidase N (APN) is a broad specificity zinc metallopeptidase with many functions that do not always depend on its enzymatic activity. Among others, it is involved in tumor angiogenesis and metastasizing and also serves as a cellular receptor of some coronaviruses. Some APN inhibitors, such as bestatin or tosedostat, were used or tested as anticancer drugs in the past. Within the past two decades, we have prepared several series of potential APN inhibitors. Some of them reached interesting values of inhibitory activity and were also successfully tested for antiproliferation activity in cancer cell lines. We also performed some QSAR studies with APN inhibitors prepared by us and other authors.</p>
</abstract>

Aminopeptidase N as a potential drug target

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<p>Mushrooms from the genus <italic>Cordyceps</italic> are characterized by a wide range of biological effects due to the diverse amount of substances contained in them and are an important source of bioactive compounds. In China, mushrooms of the genus <italic>Cordyceps</italic> have been used as a medicinal preparation of traditional Chinese medicine for centuries. So far, a considerable number of studies have been conducted that focused on analyzing the effects of <italic>Cordyceps</italic>, which include their antioxidant, antibacterial, immunomodulatory, antidiabetic, antitumor, and many other effects. The ability of fungi to form complexes with various metals is also interesting. It is believed that polysaccharides are the main component of the extracts involved in the complexation with metals, after which their biological effects are improved and deepened. The work deals with the comparison of the antioxidant and antibacterial effects of <italic>Cordyceps</italic> extracts with extracts of this mushroom enriched with silver ions. Based on scientific studies, it is assumed that there is a complexation between the chemical compounds of the extracts and silver.</p>
</abstract>

Medicinal Mushrooms Cordyceps as a New Source of Bioactive Compounds and Their Complexation With Silver Ions

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<p>Metal complexes, which, under physiologic conditions, show redox properties and are able to bind to DNA, are great tools to cleave the DNA chain. This aspect is of great importance for their use as antineoplastic drugs. We synthesized ligands derived from short-chain amino acids and from salicylaldehyde. The prepared ligands of the type of reduced Schiff bases were subsequently used for the preparation of copper(II) complexes. The aim of the study was in vitro testing of copper(II) complexes, where it was confirmed that they are capable of cleaving DNA. Their cytotoxic activity was also confirmed by the resazurin redox method on Saccharomyces cerevisiae based on preserved healthy mitochondrial function.</p>
</abstract>

DNA Cleavage and Cytotoxic Activity of Copper(II) Complexes Based on Reduced Schiff Bases Derived From Salicylaldehyde and Amino Acids

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<sec><h3>Aim</h3>
<p>The present study was aimed at preparing stable dry adsorbed nanoparticles (DANs) of olanzapine (OLZ) loaded solid lipid nanoparticles (SLNs) for sustained release.</p>
</sec>
<sec><h3>Materials/methods</h3>
<p>OLZ SLNs were prepared by hot melt emulsification and ultrasonication using Precirol ATO 5 (PRE) as a solid lipid, combination of Kolliphor ELP (KELP) and Tween 80 (T80) as surfactants, after optimising formulation and process variables. The SLN system was subjected to evaluation of particle size, zeta potential, entrapment efficiency (EE), <italic>in-vitro</italic> drug release and <italic>ex-vivo</italic> intestinal permeability studies using the chicken intestinal segments (jejunum). Further, these SLNs were converted into stable DANs by adsorbing onto a Neusilin US2 (NUS2) and Avicel CL 611 (ACL) carriers using the granulation-evaporative drying method. The DANs were characterised for redispersion properties, <italic>in-vitro</italic> drug release, thermal behaviour, crystallinity, and morphology.</p>
</sec>
<sec><h3>Results</h3>
<p>The SLN and DAN had a particle size of 238.0 nm [0.274 polydispersity index (PdI)] and 302.4 [0.494 PdI] respectively. The zeta potentials of SLN and DAN were found to be −29.3 mV and −26.3 mV, respectively. The SLN had 67% EE, and showed a sustained drug release in various media. The highest permeability of SLNs was observed in <italic>ex-vivo</italic> permeation model compared to the OLZ suspension, indicating that SLNs have the potential to bypass hepatic metabolism. The adsorption of SLNs onto carriers was confirmed by surface morphology. The DAN had good flow properties and sustained drug release similar to that of SLNs. The X-ray diffraction (XRD) patterns and endothermic peaks confirmed the complete encapsulation of actives in lipid matrices.</p>
</sec>
<sec><h3>Conclusion</h3>
<p>The encapsulating of OLZ in SLNs and converting it into DAN showed a sustained release and adsorption technique that can be used for improving the stability of NLC dispersion. The DANs can be offered in dosage forms such as filling into sachets, capsules and compressed into tablets.</p>
</sec>
</abstract>

Formulation development, in-vitro and ex-vivo evaluation of dry adsorbed solid lipid nanoparticles: an approach of overcoming olanzapine drawbacks

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