Exploring the influence of heat moisture treatment on physicochemical, pasting, structural and morphological properties of mango kernel starches from Indian cultivars

Present study was aimed to characterize the effect of heat moisture treatment (HMT) on morphological, pasting, structural and physicochemical properties of starches from mango kernels of Indian cultivars. Mango kernel starches from Safeda, Chausa and Dussheri varieties were subjected to heat moisture treatment at 20, 25 and 30 g/100 g moisture levels. Amylose content of HMT starches has negligible effect whereas water and oil binding capacities were significantly (p < 0.05) increased following heat moisture treatment. Modification had significant effect on solubility and swelling power. Modified starches were found to have low swelling power with increased solubility when compared with native counterparts. Pasting properties were significantly (p < 0.05) affected by heat moisture treatment. HMT starches have significantly (p < 0.05) increased pasting temperature, peak viscosity, setback and final and then reduced with severity of the treatment. HMT starches have shown x-ray diffraction patterns (A-type) similar to native starches with decrease in their relative crystallinities. IR spectra of mango kernel starches remained unaffected even after treatment. HMT has produced pits and dents on the surface of granules. Low retrogradation rate and fair amylose content of HMT starches can be utilized for preparation of biodegradable films and in various other applications.