Sulphur dioxide sheet and cold storage synergy for post-harvest management of Thompson seedless grapes (Vitis vinifera)

Purpose: This study examined the influence of various storage conditions on Thompson seedless (Vitis vinifera) grapes quality. Research method: Grapes were stored under four conditions: control (room temperature i.e., ۲۰-۲۲°C, no SO۲), T۱ with SO۲ sheets at room temperature i.e., ۲۰-۲۲°C, T۲ with SO۲ sheets in cold storage at ۱°C and T۳ without SO۲ sheets in cold storage at ۱°C. Changes in acidity, total soluble solids (TSS), total anthocyanin content, total phenols, sugars (glucose and fructose), trans-resveratrol, decay %, weight loss % and antioxidant activity were monitored over ۶۰ days. Findings: The findings revealed a synergistic effect between SO۲ and cold storage. Grapes stored with both SO۲ sheets and cold storage (T۱) exhibited the slowest decline in anthocyanin, phenols and antioxidant activity of ۲۱۱.۰۶ mg/L, ۲۱۰۲.۳۹ mg/L and ۷.۱۹ mM DPPH, respectively after ۶۰ days. T۱ grapes found to have slower reduction in sugars and trans-resveratrol concentration i.e., ۱۵.۴۷ to ۱۵.۳۷ g/۱۰۰mL and ۶۹۵ to ۵۱۶ µg/g, respectively compared to control samples ۱۵.۴۷ to ۱۴.۸۱ g/۱۰۰mL and ۶۹۵ to ۵۰۰ µg/g, respectively. Research limitations: The study focused solely on storage conditions of Thompson seedless variety grapes, limiting the generalizability of the findings to different grape varieties and maturity levels. Originality/value: These results highlighted the importance of proper storage techniques, particularly the combined use of SO۲ and cold storage, for maintaining grape quality and extending shelf life.

کلیدواژه ها:

anthocyanin ، Antioxidant activity ، Cold storage ، Grapes ، Sulphur dioxide