Effect of blanching and convective drying on phytochemical constituents of dried tea from white mulberry (Morus alba) leaf

Q3 Agricultural and Biological Sciences Research on Crops Pub Date : 2023-03-07 DOI:10.31830/2348-7542.2023.roc-887

N. Minh

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Abstract

White mulberry (Morus alba) leaf is highly valued due to its health-promoting attributes. It is specified by a great content of phytochemical constituents with excellent antioxidant properties. This research was conducted at STNanotech Laboratory in 2021 to evaluate the dried tea production from the white mulberry leaf. The total phenolic content, total flavonoid content, DPPH free radical scavenging, FRAP ferric reducing antioxidant and beta-carotene bleaching activity in the raw white mulberry leaf were primarily analyzed. The raw white mulberry leaf was blanched in different conditions (100/5, 95/10, 90/15, 85/20 and 80/25 oC/s) to inactivate enzymes. The blanched leaves were cut into small pieces with dimension of 0.5 × 3.5 cm. The cut mulberry leaves were then convective-dried at different conditions (50/18, 55/15, 60/12, 65/9, and 70/6 oC/h) by a convective dryer. Dried tea was left to cool and ready for testing of total phenolic content, total flavonoid content, DPPH free radical scavenging, FRAP ferric reducing antioxidant and beta-carotene bleaching activity. Results showed that raw mulberry leaves should be blanched in hot water at 95/10 (oC/s) and convective-dried at 60/12 (oC/h) to maintain the highest bioactive contents and antioxidant properties. The dried mulberry leaf tea still retained the most valuable ingredients in raw material.

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烫漂和对流干燥对白桑叶干茶植物化学成分的影响

白桑叶因其促进健康的特性而受到高度重视。它含有丰富的植物化学成分，具有优异的抗氧化性能。这项研究于2021年在stnm实验室进行，以评估白桑叶的干茶生产。对生桑叶的总酚含量、总黄酮含量、DPPH自由基清除能力、FRAP铁还原抗氧化能力和β -胡萝卜素漂白活性进行了初步分析。分别在100/5、95/10、90/15、85/20和80/25℃/s的条件下对生桑叶进行热烫，灭活酶。将焯过水的叶片切成0.5 × 3.5 cm的小片。将切下的桑叶分别在50/18、55/15、60/12、65/9和70/6℃/h条件下进行对流干燥。将干茶晾凉后进行总酚含量、总黄酮含量、DPPH自由基清除能力、FRAP铁还原抗氧化能力和β -胡萝卜素漂白活性测试。结果表明，桑叶经95/10 (oC/s)热水烫烫，60/12 (oC/h)对流干燥可保持最高的生物活性含量和抗氧化性能。干燥后的桑叶茶仍然保留了原料中最有价值的成分。

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来源期刊

Research on Crops Agricultural and Biological Sciences-Soil Science

CiteScore

1.50

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： The Research on Crops is a peer-reviewed journal publishing original research papers, review articles and short communications in English on all basic and applied aspects of crop sciences, agricultural water management, agro-climatology, agroforestry, agronomy, crop production, crop protection, cropping systems, food science & technology, genetics & plant breeding, horticulture, plant & soil science, plant biotechnology, plant nutrition, post-harvest management of crops, seed science, soil management & tillage, vegetables, weed science, agricultural engineering, agri-business, agricultural economics and extension, etc. The aim of the journal is to provide a forum for the scientific community to publish their latest research findings. The manuscripts submitted for publication should not contain data older than 4 years on the date of submission. The articles submitted for publication in this journal should not be submitted elsewhere simultaneously for publication in another journal. These should not carry any copyright material without prior permission of copyright holder. The articles should present a complete picture of the investigation made and should not be split into parts. There is no prescribed limit regarding the number of pages in case of full-length articles. However, the authors are advised to keep the length of their articles from 4 to 10 full printed pages of the journal. The articles should be divided into the sub-sections: ABSTRACT, INTRODUCTION, MATERIALS AND METHODS, RESULTS AND DISCUSSION, CONCLUSIONS, and REFERENCES. Tables and figures should be appended separately at the end.