تاثیر بسته بندی اصلاح شده حاوی نانوذرات مس بر رشد آسپرژیلوس فلاووس و آفلاتوکسین B1 در پسته تازه

Nuts are very popular in the world because of their taste and high nutritional value. Nanoparticles are antimicrobial agents that are obtained by adding active substances to the packaging system and/or using active polymers and are capable of destroying or inhibiting rotten and pathogenic microorganisms. Nano technology has advantages such as higher health safety, lower price and higher quality. Metal nanoparticles include copper, zinc, gold, titanium and silver. The purpose of this study was to use polymer films containing copper nanoparticles as a new method to increase the shelf life and maintain the quality of fresh pistachios (Pistacia vera L. Ahmad Aghaei). Fresh pistachios were packed in nanocomposite films containing copper nanoparticles (3, 5, and 7% weight) in four temperature treatments (0, 4, 12, 25 °C) and stored for 10, 15, 30, and 45 days.The results showed that the amount of aflatoxin and Aspergillus flavus increased with the increase in storage time, and the application of nano copper particles in different concentrations could significantly reduce the growth of Aspergillus flavus and aflatoxin B1. Pistachios packed with 5% w copper nanoparticles, after 30 days of storage and temperature 4 °C, the amount of Aspergillus flavus was 300 CFU/g and aflatoxin was 10.2 (ppb). In the same time conditions and at 12 °C, the amount of Aspergillus flavus was 533.33 CFU/g and aflatoxin was 0.41(ppb). In the control treatment, after 30 days of storage at a temperature of 25 °C, the amount of Aspergillus flavus and aflatoxin was 1033.33 CFU/g and 2.7 (ppb), respectively. Therefore, the application of nano copper particles on fresh pistachios was able to significantly reduce the amount of Aspergillus flavus and aflatoxin B1.