Bread will age during storage, with problems such as hardness, moisture loss, roughness, and crumbling.In this study, the synergistic effect of grape seed proanthocyanidins (GSP) and malic acid (MA) on the anti-ageing of bread was investigated.The pasting characteristics of flour were determined using a rapid viscometer.The changes in moisture content, hardness, and moisture distribution of bread during storage were measured.Regeneration of starch during storage was characterized by rapid visco analyzer (RVA), differential scanning calorimeter (DSC), and X-ray diffractometer (XRD).Results showed that GSP and MA reduced the rate of decrease in the moisture content of bread during storage.Compared to the control group, the hardness of bread with 0.1% GSP, 0.3% GSP, and 0.5% GSP at 7 days of storage was reduced by 9.91%, 9.92%, and 2.62%, respectively.The hardness of bread compounded with 0.1% MA, 0.3% MA, and 0.5% MA in 0.3% GSP was reduced by 9.34%, 10.49%, and 8.04% relative to 0.3% GSP bread, respectively.DSC and XRD data of bread storage for 5 d showed that the enthalpy of regeneration and crystallinity of starch were significantly reduced by the addition of GSP and MA.The crystallinity of the bread compounded with 0.3% GSP-0.1% MA, 0.3% GSP-0.3% MA, and 0.3% GSP-0.5% MA was decreased by 33.54%, 36.08%, and 34.18%, respectively, compared to 0.3% GSP.In summary, the phenolic hydroxyl structure of GSP interacts with wheat starch to affect the regeneration of starch.The acid hydrolysis of starch by malic acid causes the formation of low molecular weight dextrins and a decrease in starch crystallinity, thus slowing down the ageing of bread.GSP and MA play a synergistic role in delaying the ageing of bread.
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