Antibacterial Activity and Component Analysis of Water Chestnut Stem and Water Chestnut Pericarp Extracts
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摘要: 采用滤纸片扩散法研究菱角梗、菱角壳乙醇提取液及其不同溶剂萃取物的抑菌活性，并考察不同温度、pH、紫外辐照对菱角梗、菱角壳乙酸乙酯萃取物抑菌活性稳定性的影响，最后，采用高效液相色谱法和超高效液质联用法对菱角梗、菱角壳乙酸乙酯萃取物中的成分进行鉴定。结果表明：菱角梗、菱角壳乙酸乙酯萃取物对金黄色葡萄球菌、大肠杆菌和酿酒酵母菌的最小抑菌浓度分别为0.391、0.391、3.125 mg/mL和0.098、0.195、1.563 mg/mL，抑菌效果显示，菱角壳乙酸乙酯萃取物优于菱角梗乙酸乙酯萃取物，二者萃取物均对革兰氏阳性菌具有显著抑菌作用，且效果强于革兰氏阴性菌，对真菌的抑菌作用最弱；菱角梗、菱角壳乙酸乙酯萃取物在温度20~100℃、pH5~9和紫外光处理10~40 min时，均表现出良好的抑菌稳定性。经鉴定，菱角梗乙酸乙酯萃取物中含量最高的是没食子酸和1，2，6-三-O-没食子酰-β-D-葡萄糖，含量为45.87%，菱角壳乙酸乙酯萃取物中含量最高的是1，2，3，6-四-O-没食子酰-β-D-葡萄糖、槲皮素-3-O-半乳糖苷和1，2，6-三-O-没食子酰-β-D-葡萄糖，含量为57.84%。本文为菱角梗、菱角壳提取物作为抑菌剂的实际应用提供了参考。Abstract: Filter paper diffusion method was used to study the bacteriostatic activity of ethanol extracts from water chestnut stem and water chestnut pericarp and their different solvent extracts. The effects of different temperature,pH and UV irradiation on the stability of bacteriostatic activity of ethyl acetate extracts from water chestnut stem and water chestnut pericarp were also investigated. Finally,the components of ethyl acetate extracts from water chestnut stem and water chestnut pericarp was studied by HPLC and HPLC-MS to identify. The results showed that the minimum inhibitory concentrations of the extracts of water chestnut stem and water chestnut pericarp to Staphylococcus aureus,Escherichia coli and Saccharomyces cerevisiae were 0.391,0.391,3.125 mg/mL and 0.098,0.195 and 1.563 mg/mL,respectively,the antibacterial effect showed that the ethyl acetate extract of the water chestnut pericarp was superior to the ethyl acetate extract of the water chestnut stem. Both extracts had a significant bacteriostatic effect on Gram-positive bacteria,and the effect was stronger than Gram-negative bacteria,and they had the weakest antibacterial effect on fungi. The ethyl acetate extracts of water chestnut stem and water chestnut pericarp showed good antibacterial stability when treated at 20~100 ℃,pH5~9 and ultraviolet light for 10~40 min. The content of gallic acid and 1,2,6-tri-O-galloyl-β-D-glucose in the ethyl acetate extract of water chestnut stem was 45.87%. The content of 1,2,3,6-tetra-O-galloyl-β-D-glucose,Quercetin-3-O-galactoside and 1,2,6-tri-O-galloyl-β-D-glucose in the ethyl acetate extract of water chestnut pericarp was 57.84%. This paper provides a reference for the practical application of the extracts of water chestnut stem and water chestnut pericarp as bacteriostatic agents.
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Keywords:
- water chestnut stem /
- water chestnut pericarp /
- antibacterial activity
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