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Effects of pretreatment methods on the physicochemical properties of dried longan (Dimocarpus longan Lour.) pulps

文献类型： 外文期刊

作者： Deng, Yuanyuan 1 ; Lai, Chunxiang 1 ; Zhang, Yan 1 ; Zhou, Pengfei 1 ; Liu, Guang 1 ; Tang, Xiaojun 1 ; Li, Ping 1 ; Zhao, Zhihao 1 ; Zhang, Mingwei 1 ; Wei, Zhencheng 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Sericultural & Agrifood Res Inst, Key Lab Funct Foods, Guangdong Key Lab Agr Prod Proc,Minist Agr & Rural, Guangzhou, Peoples R China

2.133,Dongguanzhuang Yihenglu, Guangzhou 510610, Peoples R China

关键词： Dimocarpus longan Lour; hot air drying; longan; physicochemical property; pretreatment; pulps

期刊名称：JOURNAL OF FOOD SCIENCE （ 影响因子：3.9； 五年影响因子：4.0 ）

ISSN： 0022-1147

年卷期： 2023 年 88 卷 8 期

页码：

收录情况： SCI

摘要： Several pretreatment methods were used before hot air drying to determine the effects of pretreatment on the physicochemical properties of dried longan pulps to address issues of low efficiency and excessive browning of pulps in dried longan. The results showed that pretreatment methods such as sodium chloride steeping, hot blanching, and freeze-thawing reduced the moisture content in dried longan pulps and increased the hardness of dried longan pulps. Ultrasound, microwave, and hot blanching methods reduced the degree of browning of dried longan pulps. Freeze thawing led to a decrease in polysaccharide content in dried longan pulps. The use of ultrasound- and microwave-based pretreatment methods increased the contents of free phenolics and total phenolics and increased the oxygen radical absorbance capacity indices. Alkenes and alcohols constituted the primary volatile flavor substances in longan. It was inferred that it was favorable to use the hot blanching method before subjecting the samples to conditions of hot air drying as the moisture content and degree of browning could be reduced effectively. The results reported herein can potentially help manufacturers improve drying efficiency. The results provide a platform to produce high-quality products from dried longan pulps. Practical ApplicationLongan pulps should be subjected to conditions of the hot blanching method before subjecting the samples to conditions of hot air drying to reduce the moisture content and degree of browning. The results reported herein can help manufacturers improve the drying efficiency of pulps. The results can be exploited to produce high-quality products from dried longan pulps.

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