Development of guar gum-based coating with castor oil for improved postharvest quality of fresh mangoes using response surface methodology.

New guar gam-based coating formulation was prepared with castor oil (CO) for enhanced postharvest quality of mangoes by Response surface methodology (RSM). In this regard, the response surface methodology was used to optimize the concentrations of guar gum (GG) containing vegetable oil i.e.CO as a natural antimicrobial cross-linked with other additives, tween 80, glycerol, and calcium chloride (CaCl₂) for coating mango (Mangifera indica) fruits. The effects of main coating components, GG (1-2%, w/w), CO (1-3% v/v), tween 80 (0.2-0.5% v/v), glycerol (0.3-0.9% v/v) and CaCl₂ (1-2% v/v) on weight loss, pH, Titratable acidity (TA) and Total Soluble Solids (TSS) of coated mangoes were studied during 7 days of storage at 35°C ± ± 2°C. Result showed that guar gum (1.5%), CO (2%), Tween 80 (0.35%) glycerol (0.6%) and CaCl₂ (1.5%) were experimentally proven to be the best formulation. In addition, Fourier transforms infrared spectroscopy...