Effect of Circadian Variation of Temperature and Relative Humidity on Physicochemical Changes in Potatoes Stored in a Solar-Powered Battery-Less Cold Store
摘要
Long-term storage of potatoes is adversely affected by physicochemical changes such as rotting, sprouting and starch loss, especially under inadequate storage conditions. This study evaluated the effect of circadian variations in temperature (3–12 °C) and relative humidity (85–100%) on the quality of Kufri Bahar (KB) and Kufri Chandramukhi (KCM) variety of potatoes stored in the Pusa Farm Sun Fridge (PFSF), a solar-powered evaporative cooling system. Quality parameters including physiological loss in weight (PLW), rotting, sprouting, color, starch and sugar contents were observed and compared with potatoes stored under ambient conditions (average temperature: 38 ± 5 °C and relative humidity: 65 ± 5%) at 15 days interval for 90 days. After 90 days, potatoes stored in PFSF, showed lower weight loss (8.4% for KB and 6.7% for KCM) than ambient-stored potatoes (17.9% for KB and 12.7% for KCM). Sprouting was also reduced in PFSF (32.65% for KB and 25.64% for KCM) compared to ambient storage (72.95% and 63.56%, respectively). Rotting losses were significantly lower in PFSF (4.92% for KB and 2.6% for KCM) than in ambient conditions (23.46% and 17.78%, respectively). However, greater starch degradation was observed in PFSF (reduced to 7.04% in KB and 6.89% in KCM), though reducing sugar levels (231.6 mg/100 g in KB and 198.7 mg/100 g in KCM) remained within the acceptable threshold (0.33%). Total sugar accumulation was higher in PFSF (425.69 mg/100 g in KB and 408.60 mg/100 g in KCM) than in ambient storage. Overall, PFSF significantly minimizes storage losses while maintaining acceptable quality parameters, making it an efficient and sustainable storage option. Among the two varieties, KCM exhibited better storability.