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<p>The in-house developed Pusa Farm Sun Fridge (PFSF) is a solar-refrigerated evaporatively cooled (SREC) structure. It exhibits distinct circadian variations (cyclic daily changes) in both temperature and relative humidity (RH). Temperature and RH critically influence the ripening and storage quality of fruit. This study assessed the impact of circadian variations in temperature and RH on the storability and quality of ‘<i>Safeda</i>’ and ‘<i>Kesar</i>’ varieties of mangoes stored in PFSF (4 to 15&#xa0;°C and 85 to 100% RH) along with two other storage conditions: cold storage (CS) (8 ± 1&#xa0;°C and 85 ± 3% RH), and ambient room (34 ± 3&#xa0;°C and 60 ± 5% RH) storage. The key quality attributes of mangoes were evaluated over a 28-day period in CS, 20 days in PFSF, and 6 days in ambient storage. Mangoes stored in CS showed the lowest physiological loss in weight (PLW) of 4.65% in ‘<i>Safeda</i>’ and 3.45% in ‘<i>Kesar</i>’, while PFSF maintained moderate losses (5.78% and 4.02%) compared to ambient (14.8% and 12.8%). Firmness declined least in CS (2.05&#xa0;N to 0.95&#xa0;N for ‘<i>Safeda</i>’; 3.67&#xa0;N to 1.25&#xa0;N for ‘<i>Kesar</i>’), whereas ambient storage caused rapid softening (2.05&#xa0;N to 0.67&#xa0;N and 3.67&#xa0;N to 1.15&#xa0;N). Ambient storage accelerated deterioration, as evident by faster loss in firmness, increased total soluble solid (TSS), and rapid decline in titrable acidity (TA), total phenolic content (TPC), and total flavonoid content (TFC). However, mangoes stored in the PFSF maintained the quality parameters of mangoes closely comparable to cold storage. Cold storage preserved mango quality most effectively due to its stable microclimate, though the PFSF also significantly extended shelf life (up to 20 days) using active and passive cooling. ANOVA (<i>p</i> &lt; 0.05) showed significant quality differences among the main effects of storage conditions as well as variety, and Duncan’s Multiple Range Test (DMRT) pinpointed that cold storage performed best compared to PFSF and ambient conditions. The results highlight the efficacy of using SREC structure for sustainable postharvest storage of mangoes, offering a viable solution for rural and smallholder farmers to reduce postharvest losses and improve income through extended marketability.</p>

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Comparative assessment of mango quality under solar-refrigerated evaporative cooling, cold storage, and ambient conditions

  • 期刊论文

  • 发表日期：

    2025年12月6日

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  • Subrata Mandal,
  • Sangeeta Chopra,
  • Shalini Gaur Rudra,
  • Devinder Dhingra,
  • Roaf Ahmad Parray,
  • Ravi Pandiselvam,
  • Makdud Islam,
  • Akshay Kinge,
  • Dharmender

摘要

The in-house developed Pusa Farm Sun Fridge (PFSF) is a solar-refrigerated evaporatively cooled (SREC) structure. It exhibits distinct circadian variations (cyclic daily changes) in both temperature and relative humidity (RH). Temperature and RH critically influence the ripening and storage quality of fruit. This study assessed the impact of circadian variations in temperature and RH on the storability and quality of ‘Safeda’ and ‘Kesar’ varieties of mangoes stored in PFSF (4 to 15 °C and 85 to 100% RH) along with two other storage conditions: cold storage (CS) (8 ± 1 °C and 85 ± 3% RH), and ambient room (34 ± 3 °C and 60 ± 5% RH) storage. The key quality attributes of mangoes were evaluated over a 28-day period in CS, 20 days in PFSF, and 6 days in ambient storage. Mangoes stored in CS showed the lowest physiological loss in weight (PLW) of 4.65% in ‘Safeda’ and 3.45% in ‘Kesar’, while PFSF maintained moderate losses (5.78% and 4.02%) compared to ambient (14.8% and 12.8%). Firmness declined least in CS (2.05 N to 0.95 N for ‘Safeda’; 3.67 N to 1.25 N for ‘Kesar’), whereas ambient storage caused rapid softening (2.05 N to 0.67 N and 3.67 N to 1.15 N). Ambient storage accelerated deterioration, as evident by faster loss in firmness, increased total soluble solid (TSS), and rapid decline in titrable acidity (TA), total phenolic content (TPC), and total flavonoid content (TFC). However, mangoes stored in the PFSF maintained the quality parameters of mangoes closely comparable to cold storage. Cold storage preserved mango quality most effectively due to its stable microclimate, though the PFSF also significantly extended shelf life (up to 20 days) using active and passive cooling. ANOVA (p < 0.05) showed significant quality differences among the main effects of storage conditions as well as variety, and Duncan’s Multiple Range Test (DMRT) pinpointed that cold storage performed best compared to PFSF and ambient conditions. The results highlight the efficacy of using SREC structure for sustainable postharvest storage of mangoes, offering a viable solution for rural and smallholder farmers to reduce postharvest losses and improve income through extended marketability.