Chlorogenic acid as an innovative strategy to delay postharvest senescence and maintain quality in strawberries during cold storage

Strawberries ( Fragaria × ananassa Duch.) are highly perishable fruits due to their high metabolic activity and susceptibility to postharvest manipulation and storage. This study evaluated, for the first time, the application of chlorogenic acid (CGA), a natural polyphenol and antioxidant, as a postharvest treatment to extend the storability of strawberries during cold storage. Different concentrations of CGA (0, 1, 10, and 50 mg L⁻¹) were applied, and key quality parameters were assessed, including weight loss, respiration rate, ethylene production, colour, firmness, soluble solids, titratable acidity, and bioactive compounds. The results showed that CGA treatments, especially at higher concentrations, delayed senescence, reduced metabolism, and maintained fruit firmness. Moreover, lower membrane degradation was observed, as indicated by reduced electrolyte leakage, along with greater retention of calyx chlorophylls and total polyphenols, suggesting improved antioxidant balance and reduced enzymatic activity. CGA-treated fruit exhibited a delayed evolution of individual anthocyanins. These findings highlight the potential of CGA as an effective natural strategy for maintaining strawberry quality and reducing postharvest losses during refrigerated storage. Furthermore, the positive impact of this approach could support the use of extracts derived from agro-industrial residues of chlorogenic acid-rich byproducts as sustainable postharvest treatments.