Zhang Shenggui, Li Haiyan, Li Min, Chen Guopeng, Ma Yunxiang, Wang Yue, Chen Jinfeng
College of Food Science and Engineering, Gansu Agricultural University Lanzhou 730070 China.
Gansu Provincial Key Laboratory of Arid Land Crop Science Lanzhou 730070 China.
RSC Adv. 2022 Feb 2;12(7):4253-4262. doi: 10.1039/d1ra08172a. eCollection 2022 Jan 28.
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 C 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. 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.
为了探索一种合成抗氧化膳食纤维（ADF），成功合成了用阿魏酸（FA）部分酯化改性的多孔淀粉（PS），其具有不同的取代度（DS）。通过碳固体核磁共振（C solid-state NMR）和傅里叶变换红外光谱（FT-IR）证实了FA改性PS的酯键。X射线衍射（XRD）分析表明，阿魏酸淀粉酯具有与天然淀粉V型模式不同的晶体结构，这表明淀粉在酯化反应过程中发生了凝胶化，然后重新结晶成不同的结构。形态学研究表明，与天然淀粉相比，FA改性PS酯具有不规则蜂窝状和致密纤维状结构的不同形态。抗氧化试验表明，阿魏酸淀粉酯具有优异的抗氧化能力。特别是，在β-胡萝卜素-亚油酸试验中，FA改性PS酯的抗氧化能力比游离FA高得多。这项研究推进了利用多孔淀粉改变抗氧化多酚生物活性的技术。我们期望这项工作能激发食品工业中关于酚类与其他食品成分相互作用的进一步研究。
