食品科学

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蓝莓果实贮藏期间软化及相关指标的变化

纪淑娟,马 超,周 倩,程顺昌,魏宝东   

  1. 沈阳农业大学食品学院,辽宁 沈阳 110866
  • 出版日期:2013-06-25 发布日期:2013-06-17

Softening and Softening Indices Change of Blueberry during Storage

JI Shu-juan,MA Chao,ZHOU Qian,CHENG Shun-chang,WEI Bao-dong   

  1. College of Food Science, Shenyang Agricultural University, Shenyang 110866, China
  • Online:2013-06-25 Published:2013-06-17

摘要:

对蓝莓果实贮藏期间软化相关指标的变化进行分析。结果表明:常温贮藏期间腐烂率、可滴定酸含量、过氧化物酶(POD)活性、纤维素酶(Cx)活性及β-半乳糖苷酶(β-Gal)活性与果实软化关系密切,其中,腐烂率和Cx活性与果实硬度呈极显著负相关,而可滴定酸含量与硬度呈极显著正相关;冷藏期间蓝莓果实硬度、可滴定酸含量逐渐降低,腐烂率随贮藏时间的延长而升高;POD活性、Cx活性、β-Gal活性随着果实硬度的下降呈明显上升趋势,POD活性与Cx活性在贮藏后期急剧上升,活性高峰出现在贮藏60d时,β-Gal活性高峰则出现在贮藏前期,之后一直保持较高水平;与常温贮藏相比较,冷藏30d的蓝莓果实在常温货架期前4d,果实硬度和可滴定酸含量的下降率较低,腐烂率、POD活性、Cx活性变化幅度小,β-Gal活性高峰不明显。由此可见,冷藏30d的蓝莓果实在常温货架期可达到4d。

关键词: 蓝莓, 冷藏, 货架, 软化

Abstract:

Blueberry fruit softening and softening indices change during storage were analyzed. Results showed that decay
index, titratable acid content, POD activity, Cx activity and β-Gal activity were closely related with firmness during storage
at room temperature. Among them, decay index and Cx activity showed highly significant negative correlation with firmness,
whereas there was a significant positive correlation between the content of titratable acid and firmness. Firmness and titratable
acid content decreased slowly, whereas decay index rose during cold storage at 0 ℃. POD activity, Cx activity and β-Gal
activity showed an obvious increasing trend along with decreasing firmness. POD activity and Cx activity rose rapidly in the
last stage of storage. Their activity peaks occurred on the 60th day of refrigeration at 0 ℃, while β-Gal activity climax occurred
in the early stage of storage and then its activity kept at a high level. Compared with fresh blueberry, blueberry refrigerated for
30 days showed smaller decreases in firmness and titratable acid content, less changes in decay index, POD activity and Cx
activity and no significant β-Gal activity climax after 4 days of storage at room temperature. From the above results, it can be
seen that blueberry refrigerated for 30 days can keep its quality for 4 days at room temperature.

Key words: blueberry, refrigeration, shelf life, softening