食品科学 ›› 2019, Vol. 40 ›› Issue (5): 57-62.doi: 10.7506/spkx1002-6630-20180201-006

• 基础研究 • 上一篇    下一篇

桃仁多肽螯合亚铁的抑菌活性及结构表征

杨玉蓉1,李安平1,2,*,钟政昌3,喻舟峰1   

  1. 1.中南林业科技大学食品科学与工程学院,湖南 长沙 410004;2.特医食品加工湖南省重点实验室,湖南 长沙 410004;3.西藏农牧学院食品科学学院,西藏 林芝 860000
  • 出版日期:2019-03-15 发布日期:2019-04-02
  • 基金资助:
    湖南省科技创新平台与人才计划项目(2017TP1021);西藏自治区农业重大专项项目(Z2016B01N04)

Antibacterial Activity and Structural Characterization of Peach Kernel Peptide-Ferrous Chelate

YANG Yurong1, LI Anping1,2,*, ZHONG Zhengchang3, YU Zhoufeng1   

  1. 1. College of Food Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China; 2. Hunan Key Laboratory of Processed Food for Special Medical Purpose, Changsha 410004, China; 3. College of Food Science, Tibet Agriculture and Animal Husbandry University, Linzhi 860000, China
  • Online:2019-03-15 Published:2019-04-02

摘要: 分别对亚铁离子与不同分子质量桃仁多肽和不同植物多肽形成的螯合物,以及亚铁、锌、钙和镁离子与桃仁多肽形成螯合物的抑菌活性进行比较,并对螯合物进行结构表征。结果表明:小分子质量(小于5 000 Da)桃仁多肽PKP3组分与亚铁离子螯合后的抑菌活性强于大分子质量(大于10 000 Da)桃仁多肽亚铁螯合物,桃仁多肽与亚铁离子和锌离子螯合后有较强抑菌活性;4 种植物多肽与亚铁离子所形成的螯合物间的抑菌活性存在显著性差异(P<0.05),其中桃仁多肽螯合亚铁和小麦多肽螯合亚铁的抑菌活性最强,对大肠杆菌的最小抑菌浓度(minimum inhibitory concentration,MIC)均为5.0 mg/mL,对金黄色葡萄球菌的MIC分别为2.5、5.0 mg/mL;傅里叶变换红外光谱分析表明亚铁离子与4 种植物多肽分子的—COO-、N—H、C=O形成配位键,多肽与亚铁离子能有效地螯合形成多肽螯合亚铁。

关键词: 桃仁, 多肽, 螯合, 抑菌活性, 傅里叶变换红外光谱

Abstract: The antibacterial activity of chelates formed by ferrous ions with peach kernel peptides with different molecular masses or peptides from other plant sources and chelates of ferrous, zinc, calcium or magnesium with peach kernel peptide were compared. Then, the structures of all chelates were characterized by Fourier transform infrared (FTIR) spectroscopy. Results indicated that the antibacterial activity of low-molecular-mass peach kernel peptide-ferrous chelate (PKP3, < 5 000 Da) was stronger than that of high-molecular-mass peptide-ferrous chelate (> 10 000 Da). Peach kernel peptide chelates with ferrous and zinc both had strong antibacterial activity. There were significant differences (P < 0.05) in the antibacterial activity of the ferrous-chelating peptides from peach kernel, soybean, corn and wheat. Among them, peach kernel peptide-ferrous and wheat peptide-ferrous chelates had the strongest antibacterial activity, with minimum inhibitory concentrations (MICs) of 5.0 mg/mL for Escherichia coli, and MICs of 2.5 and 5.0 mg/mL for Staphylococcus aureus, respectively. FTIR spectra illustrated that –COO-, N–H and C═O in each of the four peptides were involved in the chelation reaction with ferrous ions to form ferrous-chelating peptides.

Key words: peach kernel, peptide, chelating, antibacterial activity, Fourier transform infrared spectroscopy

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