Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (8): 1743-1751.DOI: 10.3969/j.issn.1004-1524.2022.08.18

• Food Science • Previous Articles     Next Articles

Effects of blanching and drying on nutritional components and processing suitability of dried Promma microphylla Turcz leaves

XIN Xiaoting1(), LIU Daqun1, ZHANG Jianming1, ZHANG Chengcheng1,*(), YANG Guangting2   

  1. 1. Key Laboratory of Fruits and Vegetables Postharvest and Processing Technology Research of Zhejiang Province, Institute of Food Science, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
    2. Wuyi Xuannan Agricultural Development Co. Ltd., Wuyi 321200, Zhejiang, China
  • Received:2021-03-08 Online:2022-08-25 Published:2022-08-26
  • Contact: ZHANG Chengcheng

Abstract:

In this paper, the effects of different processing methods on the nutritional components, antioxidant properties and the processing suitability of dried Promma microphylla Turcz leaves powder were studied. Blanching and different drying methods were used to treat Promma microphylla Turcz leaves, and they were divided into fresh (F), freeze-dried (FD), hot-air dried (HAD), fresh blanched (FB), blanched freeze-dried (BFD) and blanched hot-air dried (BHAD) group. The results showed that the leaves of FD group showed the best color, and the highest contents of total amino acids, reducing sugar, total phenol and total flavonoids were 36.16 mg·g-1, 61.98 mg·g-1, 6.31 mg·g-1 and 106.56 mg·g-1, respectively. The DPPH and FRAP values of FD, BFD and HAD were significantly higher than other treatments (P<0.05). Promma microphylla Turcz tofu was made from different treated Promma microphylla Turcz leaves dried powder. The BFD group tofu showed the best color with the lowest a* value. In addition, BFD group tofu showed the shortest solidification time, highest yield, least exudate, and the best hardness, elasticity, cohesiveness, stickiness, chewiness, and sensory score of 83.33 ± 2.86. The BFD group retained the most nutritional efficacy and antioxidant capacity. As a result, blanched and freeze-dried treatment was the most suitable treatment for processing high-quality Promma microphylla Turcz leaves tofu.

Key words: Promma microphylla Turcz leaves dry powder, nutritional components, texture, sensory evaluation

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