Pretreatment of defatted wheat germ proteins (by-products of flour mill industry) using ultrasonic horn and bath reactors: Effect on structure and preparation of ACE-inhibitory peptides

文献类型： 外文期刊

第一作者： Zhou, Cunshan

作者： Zhou, Cunshan;Ma, Haile;Yu, Xiaojie;Yagoub, Abu El-Gasim A.;Pan, Zhongli;Zhou, Cunshan;Ma, Haile;Yu, Xiaojie;Zhou, Cunshan;Ma, Haile;Yu, Xiaojie;Liu, Bin;Yagoub, Abu El-Gasim A.;Pan, Zhongli

作者机构：

关键词： Ultrasonic horn reactor;Ultrasonic bath reactor;Defatted wheat germ;Protein structure;ACE-inhibitory activity

期刊名称：ULTRASONICS SONOCHEMISTRY （ 影响因子：7.491； 五年影响因子：7.537 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The ultrasonic horn and bath reactors were compared based on production of angiotensin-converting-enzyme (ACE) inhibitory peptides from defatted wheat germ proteins (DWGP). The DWGP was sonicated before hydrolysis by Alcalase. Degree of hydrolysis, ACE-inhibitory activity, surface hydrophobicity, fluorescence intensity, free sulfhydryl (SH), and disulfide bond (SS) were determined. The highest ACE-inhibitory activity of DWGP hydrolysate was obtained at power intensity of 191.1 W/cm2 for 10 min in the ultrasonic horn reactor. The fixed frequency of 33 kHz and the sweep frequency of 40 ± 2 kHz resulted in the maximum ACE-inhibitory activity. The combined irradiation of dual fixed frequency (24/68 kHz) produced significant increase in ACE-inhibitory activity compared with single frequency (33 kHz). The ultrasonic probe resulted in significant higher ACE-inhibitory activity compared with ultrasonic bath operating at single or dual fixed and sweep frequencies. The changes in conformation of the DWGP due to sonication were confirmed by the changes in fluorescence intensity, surface hydrophobicity, SHf and SS contents and they were found in conformity with the ACE-inhibitory activity in case of the ultrasonic horn reactor but not in bath reactor.

分类号： O644.3

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