A novel edible film was developed using Lallemantia peltata (L.) seed gum (LSG), and its water sensitivity, physico-mechanical, barriers, microstructural and thermal properties as a function of glycerol concentration (20, 30, 40, 50 and 60% w/w) were studied. Different models were also used to investigate the water sorption of the LSG films. Unplasticized LSG films were brittle and difficult to handle which were effectively modified by glycerol addition. Water sensitivity, oxygen permeability, and elongation of LSG films were increased with increasing glycerol concentration. Also, increasing of glycerol concentration resulted in reduction of tensile strength, glass transition temperature (Tg) and melting temperature (Tm) of the films. Electron scanning micrographs revealed a smooth surfaceand compact cross-section microstructure in LSG films.The films showed sigmoid shape type II water sorption isotherms, representing typical features of most of biopolymers. Accordingly, the results suggest that LSG films containing desired glycerol concentration could potentially be used as edible films in food packaging. پرونده مقاله

In this study, the biological activities of whole herb extract of a medicinal plant named Smirnovia Iranica were investigated. The extraction was performed using Supercritical CO2 and phytochemical compounds, total phenolic content (TPC), total flavonoid content (TFC), antioxidant, anti-bacterial, and anti-cancer effect were determined in the extract. Based on the results, high TPC concentration (120.36 mg GAE/100 g FW) and TFC (17.41 mg quercetin/100g FW) were obtained in the extract. Besides, the extract showed significant antioxidant activity (IC50=53.97 µg mL-1). Moreover, the extract showed a notable inhibitory effect againstEscherichia coli(MIC=15.63 mg mL-1) andSalmonella enterica (MIC=31.25 mg mL-1). On the other hand, this extract showed the cytotoxic effect on glioblastoma cancer cell lines in the MTT assay. This is the first, yet comprehensive, scientific report about the chemical composition and pharmacological properties of the extract of Smirnovia Iranica whole herb. According to current results, the Smirnovia Iranica extract has excellent antioxidant properties for application as bioactive components for various objects such as as food supplements. The experiment confirmed the efficacy of the extracts as natural antimicrobials and suggested the possibility of employing them in drugs for the treatment of infectious diseases caused by the test organisms. پرونده مقاله

The dried pomegranate (Punica granatum L.) arils have several health benefits and are in demand worldwide. Beside this they are highly perishable due to their high water content and susceptibility to microbial growth, resulting in shortened shelf-life and compromised quality attributes. Therefore, in the current study, the wrapping effects of Poly L-lactide (PLA) activated with zinc oxide nanoparticles (ZnO NPs, 1.5% w/w) and Zataria multiflora Boiss. essential oil (ZEO, 1 and 1.5% w/w) were studied on pomegranate arils' storage-life extension in cold storage. The arils were periodically analyzed for physiochemical properties (weight loss, pH, total soluble solids, color measurement, antioxidant activity, and sensory attributes) and microbial properties (total aerobic bacteria and total fungi counts). Results showed that ZEO caused a decrease in pH during storage, while ZnO caused an increase. The active films were more effective than the control film in maintaining TTS and preventing weight loss of the arils. The PLA/ZnO/1.5% ZEO sample had the highest phenolic content (∼520 mg 100 ml-1 in juice) and antioxidant activity (∼90%) on day 15. However, ZEO had a greater effect on the color properties of the arils compared to ZnO, with 0.5% and 1.5% ZEO-PLA showing the highest a* (55.14) and b* (31.30) values with fresh arils, respectively. The microbial test results showed that ZEO was more effective in controlling bacterial growth than ZnO. Based on atomic absorption spectrophotometer measurement, minimal amounts (∼29 mg Kg-1 sample) of Zn2+ ions were observed to be released into the arils. Overall, the active PLA could be used as a safe and effective way to prolong the storage life of arils in refrigerated conditions. پرونده مقاله