食品科学 ›› 2010, Vol. 31 ›› Issue (2): 241-244.doi: 10.7506/spkx1002-6300-201002061

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不同分子量的壳聚糖在草莓保鲜中的作用

匡银近1,龙 晶1,徐东生1,覃彩芹1,2,*   

  1. 1.孝感学院天然多糖研究室 2.武汉大学 生物质资源化学与环境生物技术湖北省重点实验室
  • 收稿日期:2009-01-15 修回日期:2009-08-08 出版日期:2010-01-15 发布日期:2010-12-29
  • 通讯作者: 覃彩芹 E-mail:qincq@sohu.com
  • 基金资助:

    生物质资源化学与环境生物技术湖北省重点实验室开放基金项目(HBRCEBL2008002);
    湖北省科技攻关项目(2004AA101C59)

Effect of Chitosan Coating on Strawberry Preservation

KUANG Yin-jin1,LONG Jing1,XU Dong-sheng1,QIN Cai-qin1,2,*   

  1. 1. Laboratory of Natural Polysaccharides, Xiaogan University, Xiaogan 432000, China;2. Key Laboratory of Biomass-Resource
    Chemistry and Environmental Biotechnology of Hubei Province, Wuhan University, Wuhan 430072, China)
  • Received:2009-01-15 Revised:2009-08-08 Online:2010-01-15 Published:2010-12-29
  • Contact: QIN Cai-Qin E-mail:qincq@sohu.com

摘要:

采用平板法实验7 种不同相对分子质量壳聚糖的系列样品对草莓灰霉病病原真菌的抗菌性能,结果表明6种水不溶性壳聚糖的乙酸溶液表现出抑菌活性,特别是中等相对分子质量(Mw 7.8 × 104、4.8 × 104)壳聚糖的抑菌活性明显优于更高相对分子质量的壳聚糖或低相对分子质量壳聚糖,而壳寡糖的抑菌活性则很弱。水不溶性壳聚糖的乙酸溶液浸泡采后草莓30s 后,草莓受灰霉病菌的侵染和软化被显著抑制,果实含糖量和VC 含量的下降趋势也得到了延缓,提高了保鲜效果,但是壳寡糖无明显该作用。根据实验结果,相对分子质量在5 × 104~20 × 104 的壳聚糖在5~10g/L 质量浓度处理的草莓保鲜效果较好。

关键词: 壳聚糖, 相对分子质量, 草莓, 灰霉病, 保鲜

Abstract:

Seven different molecular weight chitosans were tested for antimicrobial effect against Botrytis cinerea by spread plate method. Along with this, the effect of chitosan coating on hardness and soluble solids, VC and reducing sugar contents of strawberry stored at ambient temperature was investigated. Results showed that of the 7 chitosans, 6 water insoluble ones dissolved in acetic acid exhibited a higher inhibitory effect against B. cinerea, especially medium weight molecular chitosans (7.8×104, 4.8×104), whereas chitooligomer exhibited a poorer inhibitory effect. Exposure to water insoluble chitosans dissolved in acetic acid for 30 d significantly protected strawberry from Botrytis cinerea invasion, inhibited fruit softening and delayed the decreases in contents of reducing sugar and VC, thereby providing a good preservation effect. However, no significant preservation effect of chitooligomer was observed. According to experiments, within the concentration range of 5-10 g/L, chitosans with molecular weight between 5 × 104 and 20 × 104 demonstrated a better preservation effect on strawberry.

Key words: chitosan, molecular weight, strawberry, Botrytis cinerea, coating preservation

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