Grain has been heat-processed to alter rumen degradation characteristics and improve nutrient availabilities for ruminants. However, limited study was found on internal structure changes induced by processing on a molecular basis. The objectives of this study were to use advanced vibrational molecular spectroscopy to: (1) determine the processing induced carbohydrate (CHO) structure changes on a molecular basis, (2) investigate the effect of pressure heating on changes of CHO chemical profiles, CHO subfractions in cool-climate CDC Chickpea varieties, and (3) to reveal the association between carbohydrates related molecular spectra with carbohydrate metabolic profiles. The cool-climate CDC chickpea varieties with multisource were pressure heated in an autoclave at 120 °C for 60 min; and FTIR vibrational spectroscopy was used to detect the molecular spectra. Molecular spectroscopic results showed that compared to raw chickpea varieties, autoclave heating induced changes in both total CHO (region and baseline ca. 1186-946 cm) and structural CHO (STCHO, region and baseline ca. 1482-1186 cm), except for cellulosic compounds (CELC, region and baseline ca. 1374-1212 cm). The CHO chemical profile and rumen degradation results showed that autoclave heating decreased rumen degradable, undegradable and intestinal digestible sugar (CA4) content, but increased available fiber (CB3) content, without affecting available energy of chickpeas. The changes of CHO molecular spectra in chickpea varieties were strongly correlated with CHO chemical profiles, CHO subfractions, and CHO rumen degradation characteristics. Moreover, the regression analysis showed that STCHO peak 1 height could be used to predict sugar content, its rumen degradability and digestibility of chickpeas. Our results suggest that autoclave heating markedly changes sugar and fiber degradation characteristics. The carbohydrate molecular spectral profiles are associated with carbohydrate metabolic profiles in raw and pressure heated cool-climate chickpeas.
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