Abstract
For exploration of a type of synthetic antioxidant dietary fiber (ADF), porous starch (PS), modified by esterification with ferulic acid (FA) moieties, was synthesized successfully, with different degree of substitution (DS). The ester linkage of FA modified PS was confirmed by 13C solid-state NMR and FT-IR. XRD analysis showed that starch ferulates had a different crystal structure from the V-type pattern of native starch, suggesting that the starch gelled during the esterification reaction, then re-crystallized into a different structure. Morphological studies revealed that FA modified PS esters had a different morphology of irregular beehive-like and dense fibrous-like structures compared with that of native starch. In vitro antioxidant assays showed that starch ferulates had excellent antioxidant capacity. In particular, FA modified PS esters had a much higher antioxidant capacity than free FA in the β-carotene–linoleic acid assay. This study has advanced the technology of using porous starches for modifying the biological activity of an antioxidant polyphenol. We expect this work would inspire further studies on the interactions of phenolics with other food ingredients in the food industry.
Highlights
Epidemiological studies indicate that regular consumption of fruits and vegetables is associated with lower risk of diseases including stroke, cancer and other chronic diseases.[1]
X-ray diffraction analysis (XRD) analysis showed that starch ferulates had a different crystal structure from the V-type pattern of native starch, suggesting that the starch gelled during the esterification reaction, re-crystallized into a different structure
In vitro antioxidant assays showed that starch ferulates had excellent antioxidant capacity
Summary
Epidemiological studies indicate that regular consumption of fruits and vegetables is associated with lower risk of diseases including stroke, cancer and other chronic diseases.[1]. Intravenous aCollege of Food Science and Engineering, Gansu Agricultural University, Lanzhou 730070, China bGansu Provincial Key Laboratory of Arid Land Crop Science, Lanzhou, 730070, China cState Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, China dCollege of Science, Gansu Agricultural University, Lanzhou 730070, China administration has low bioavailability to the circulatory system and little in vivo biological activity.[10] Starch-based carriers, which are almost completely degraded in the colon, are an effective approach for improving the bioavailability of ferulic acid in ADFs; the colon micro ora releases ferulic acid from starch ferulates much more extensively than from wheat bran.[6] Starch ferulates, as a food-ingredient, have better functional and physicochemical properties than native starch, including lower viscosity, higher water holding capacity and a reduced tendency for retrogradation during low temperature storage.[11,12] Starch ferulates, showed a feasible alternative strategy to improve starch physicochemical properties with higher bioavailability of ferulic acid.[6,10]. Porous starch modi ed with FA (donated as FA@PS) was synthesized successfully, using N,N0-carbonyldiimidazole (CDI) to promote the esteri cation reaction of starch hydroxyl groups with the carboxyl group of ferulic acid. The ndings from this study will provide improved understanding of ADFs to facilitate new applications for lowering the risk of chronic disease and expanding the applications of functional polysaccharides
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
