Journal
FOOD HYDROCOLLOIDS
Volume 119, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodhyd.2021.106831
Keywords
Ultrasonication; In vitro digestibility; Semigelatinization; High amylose maize starch
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High- and low-temperature ultrasonication enhanced the short-range ordered molecular structure and apparent amylose content of semigelatinized high amylose maize starch. High-temperature ultrasonication increased slowly digestible starch and resistant starch, while low-temperature ultrasonication only decreased resistant starch.
This study aimed to observe and quantify the high- and low-temperature ultrasonication impact of semigelatinized high amylose maize starch on physicochemical properties and in vitro digestibility. High- and lowtemperature ultrasonication did not increase the degree of gelatinization, but generated cracks and pores on the starch granule surface and enhanced the short-range ordered molecular structure and apparent amylose content (AAC). Compared with incubation treatments, high-temperature ultrasonication gradually increased the slowly digestible starch (SDS) and resistant starch (RS), whereas low-temperature ultrasonication only decreased RS. Principal component analysis (PCA) and multivariate linear regression results showed that SDS and RS were significantly affected by the long-range ordered molecular structure, a molecular weight distribution of amylopectin, enthalpy change and AAC, whereas the short-range ordered molecular structure further dominated RS. Our results improved the understanding of physicochemical property changes in low- and high-temperature ultrasonication on semigelatinized high amylose maize starch and differentiated the significant principal components of SDS and RS formation.
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