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农学学报 ›› 2022, Vol. 12 ›› Issue (12): 48-55.doi: 10.11923/j.issn.2095-4050.cjas2021-0130

• 农业工程/农业机械/生物技术/食品科学 • 上一篇    下一篇

桔梗多糖复合涂膜剂在秋葵中的保鲜效果研究

郑妍(), 张晓虎(), 文佳奇   

  1. 商洛学院生物医药与食品工程学院,陕西商洛 726000
  • 收稿日期:2021-07-14 修回日期:2022-05-31 出版日期:2022-12-20 发布日期:2023-01-05
  • 通讯作者: 张晓虎 E-mail:1969492325@qq.com;zxh5462@163.com
  • 作者简介:郑妍,女,1998年出生,陕西汉中人,研究方向:食品科学与工程。E-mail:1969492325@qq.com
  • 基金资助:
    2018年商洛市科技计划项目“秦岭‘五大商药’缓控释专用肥产业化开发与应用示范”(SK2018-23)

Effect of Platycodon grandiflorum Polysaccharide Compound Coating Agent on Preserving Okra

ZHENG Yan(), ZHANG Xiaohu(), WEN Jiaqi   

  1. College of Biology Pharmacy and Food Engineering, Shangluo University, Shangluo 726000, Shaanxi, China
  • Received:2021-07-14 Revised:2022-05-31 Online:2022-12-20 Published:2023-01-05
  • Contact: ZHANG Xiaohu E-mail:1969492325@qq.com;zxh5462@163.com

摘要:

为延长秋葵货架期,以商洛桔梗为对象,研究桔梗多糖的抑菌效果,复配防腐涂膜剂并用于秋葵贮藏保鲜。采用超声辅助浸提桔梗多糖的得率为27.28%,并利用AB-8型大孔树脂对其初步纯化。桔梗多糖对供试菌种的抑菌效果顺序为大肠杆菌>金黄色葡萄球菌>沙门氏菌。以桔梗多糖、海藻酸钠、氯化钙、柠檬酸为复配物,以失重率、叶绿素含量为检测指标进行秋葵保藏实验;基于单因素实验结果,用响应面法分析各因素的交互作用,确定最优配方为2.98%桔梗多糖溶液+1.07%海藻酸钠+1.42%氯化钙+3.00%柠檬酸。制备复合涂膜剂,在25℃、RH65%下,将其应用于秋葵保藏10天后,其叶绿素含量为18.62 mg/100 g,失重率为7.65%,该复合涂膜剂对秋葵的保鲜效果良好。研究结果可作为桔梗多糖在果蔬贮藏保鲜应用中的技术参考。

关键词: 桔梗多糖, 复合涂膜剂, 秋葵, 保鲜, 抑菌, 响应面法

Abstract:

To prolong the shelf-life of okra, taking Shangluo Platycodon grandiflorum as the research material, the effect of the compound coating agent containing polysaccharide extracted from P. grandiflorum on preserving okra was studied. Ultrasonic-assisted extraction was adopted to extract P. grandiflorum and the yield was 27.28%. The polysaccharide extraction solution was preliminarily purified by AB-8 macroporous resin. The order of bacteriostatic effect of P. grandiflorum polysaccharide on tested bacteria was as follows: Escherichia coli> Staphylococcus aureus> Salmonella. The compound coating agent was made of P. grandiflorum polysaccharide, sodium alginate, calcium chloride and citric acid, and the preservation experiment of okra was carried out, taking weight loss rate and chlorophyll content as indexes. Based on single factor experiments, response surface method was applied to optimize the formula of the compound coating agent. The results showed that the optimal formula was as follows: 2.98% P. grandiflorum polysaccharide solution+ 1.07% sodium alginate+ 1.42% calcium chloride+ 3.00% citric acid. Under the above formula, the compound coating agent was used for okra preservation and performed well. After 10 days at 25℃ and RH65%, the content of chlorophyll was 18.62 mg/100 g and the weight loss rate was 7.65%. The results can provide technical reference for the application of P. grandiflorum polysaccharide in fruit and vegetable storage.

Key words: Platycodon grandiflorum polysaccharide, compound coating agent, okra, preservation, bacteriostasis, response surface method

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