Evaluation of quality parameter variations and aflatoxin contamination of corn seeds (Zea mays) stored in Purdue improved crop storage (PICS) bags in North Central Province, Sri Lanka

Abstract

Post-harvest grain storage is crucial for maintaining the grain quality and ensuring food security. This study assesses the variation in quality parameters and aflatoxin contamination of corn seeds under two storage conditions. Treatments included Poly Propylene (PP) Woven bags (T0), and Purdue Improved Crop Storage (PICS) bags (T1), evaluated as a safer and cost effective alternative. Dried corn seeds (Jet 999 variety, <13% moisture) were stored under warehouse conditions (Temperature: 31-37 0C and Relative Humidity (RH): 55-70%) in Ihalagama, Kekirawa, North Central Province, Sri Lanka. A total number of 54 corn seed samples (27 per treatment) were evaluated to measure changes in moisture content, seed color, and aflatoxin contamination during an eight week storage period in PICS and PP woven bags. A significant (p <0.05) increase in aflatoxin content was observed in PP woven bag by the eighth week (2.87±0.25), whereas it aflatoxin levels remained lowest in PICS bag (0.90±0.10). Moisture content in T0 (PP woven bags) significantly increased from 12.37% to 13.01%, compared to a smaller increase in T1 (PICS bags) from 12.34% to 12.50%. No significant differences were observed in L, a, or b color values between treatments over time (p >0.05). These findings confirm that PICS bags provide a chemical-free, cost-effective, and sustainable alternative for safer corn storage in Sri Lanka, with important implications for food safety, postharvest policy, and industry adoption.