4.3 Article

Effect of Crosslinking Agents on the Physicochemical and Digestive Properties of Corn Starch Aerogel

Journal

STARCH-STARKE
Volume 73, Issue 3-4, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/star.202000161

Keywords

crosslinking agents; digestibility; physicochemical properties; starch aerogels; vacuum drying

Funding

  1. Open Project Program of Beijing Key Laboratory of Flavor Chemistry, Beijing Technology and Business University (BTBU), Beijing, China [SPFW2020YB03]
  2. Pre-Research Project of Innovation Project of Beijing Academy of Science and Technology [PXM2020_178305_000007]
  3. Fundamental Research Funds to the Central Universities of China [2015ZCQ-SW-04]

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The study demonstrates that specific materials used in crosslinking reactions can alter the structure and properties of corn starch aerogels, increasing their swelling power and solubility, decreasing crystallinity, and slowing down the digestion rate.
In this study, sodium trimetaphosphate, adipic acid, sodium hexametaphosphate, and epichlorohydrin (EPI) are used to investigate the effect of the crosslinking reaction on the physicochemical properties and in vitro digestibility of corn starch aerogel (CSA). Gelatinization destroys the morphology of the corn starch granules, and the crosslinking reaction which is performed in the gelatinization stage considerably alters the structure of the gel. The aerogel prepared by adding 0.5% EPI shows the highest Brunauer-Emmett-Teller surface area among the crosslinked starch aerogels. Corn starch xerogels and aerogels all have porous network structures which may be related to the high amylose structure of corn starch. Gelatinization and crosslinking agents disrupt the short-range molecular order of corn starch, and the crosslinked CSA has relatively lower crystallinity and higher swelling power and solubility than the control. After crosslinking, rapidly digestible starch and resistant starch content of CSAs increase, while slowly digestible starch decreases slightly. Thus, the crosslinked CSA may be used for encapsulation with low digestibility.

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