3种保鲜剂及其复合物体外抗灵武长枣采后主要病原菌研究

以灵武长枣采后主要病原真菌黑根霉、皮落青霉、链格孢、粉红聚端孢为试验材料,研究了离体条件下壳聚糖、海藻酸钠、百里香酚及其复合物处理和基质pH值对这4种供试菌的抑菌活性。结果表明,3种保鲜剂及其复合物对供试菌均有不同程度的抑制作用,其中对粉红聚端孢的抑制作用最强,对黑根霉的抑制作用最弱。此外,3种保鲜剂及其复合物在pH 5.4时具有较强的抗菌活性,其中以壳聚糖-百里香酚的抗菌活性最强。

Antibacterial effect of three preservatives and their combinations on major pathogenic fungi in post-harvest Zizphus jujube Mill cv.Lingwu changzao in vitro

In this paper,the antifungal activities of chitosan,sodium alginate,thymol and their combinations and pH levels of culture mediums on major pathogenic fungi in post-harvest Lingwu changzao,such as Rhizopus stolonifer,Penicillium crustosum,Alternaria alternate(Fr.) Keiss and Trichoderma roseum(Pers.) were investigated in vitro.The results indicated that the three preservatives and their combinations had an inhibitory effect on the four experimental fungi in different degrees.They had a remarkable inhibitory effect on Trichoderma roseum(Pers.) but a weak inhibitory effect on Rhizopus stolonifer.Besides,three preservatives and their combinations had a strong inhibitory effect on the four experimental fungi when pH was 5.4,especially chitosan-thymol had remarkable inhibitory effect on the four experimental fungi.