食品科学

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采后短波紫外线处理对苹果耐贮性和品质的影响

李玉娟,尹明安*,任小林   

  1. 西北农林科技大学园艺学院,陕西 杨凌 712100
  • 出版日期:2015-07-25 发布日期:2015-07-15
  • 通讯作者: 尹明安
  • 基金资助:

    国家现代农业(苹果)产业技术体系建设专项(nycytx08-05-02)

Effects of UV-C Radiation on Storability and Quality in Harvested Apple

LI Yujuan, YIN Ming’an*, REN Xiaolin   

  1. College of Horticulture, Northwest A&F University, Yangling 712100, China
  • Online:2015-07-25 Published:2015-07-15
  • Contact: YIN Ming’an

摘要:

以红富士苹果为试材,研究7.5 kJ/m2剂量短波紫外线(ultraviolet-C,UV-C)处理对苹果常温和低温条件下贮藏性和品质的影响。供试苹果经7.5 kJ/m2 UV-C照射后,分别贮藏在20 ℃和0 ℃条件下,定期测定果实质量损失率、呼吸强度、硬度、可溶性固形物含量(soluble solids content,SSC)、可滴定酸含量、超氧化物歧化酶(superoxide dismutase,SOD)活性及丙二醛(malondialdehyde,MDA)含量。结果表明,不论是常温还是低温条件下,整个贮藏过程中,UV-C处理组果实质量损失率、呼吸强度均较对照低;果实硬度、可滴定酸含量呈下降趋势,但处理组高于对照组;SSC整体呈先上升后下降趋势,但处理组较对照组下降缓慢;SOD活性总体呈先上升后下降趋势,但UV-C处理组活性始终高于对照组;果实MDA含量均呈上升趋势,但处理组上升缓慢。可见,采后苹果经适宜剂量UV-C照射能减轻质量损失,降低呼吸强度,减缓果实硬度、SSC及可滴定酸含量下降,保护膜完整性,延缓衰老,对保障品质,延长贮藏保鲜期有良好效果。

关键词: 苹果, 短波紫外线, 贮藏, 保鲜, 品质

Abstract:

In the present work, we examined the effects of treatment with 7.5 kJ/m2 UV-C on the storability and quality of
Fuji apple fruits at room temperature and low temperature. Test apples were stored at 20 or 0 ℃ after being treated with
7.5 kJ/m2 UV-C. Weight loss rate, respiration rate, soluble solids content (SSC), titratable acid content (TAC), superoxide
dismutase (SOD) activity and malondialdehyde (MDA) content were measured regularly during storage. The results showed
that weight loss rate and respiration rate of UV-C treated fruits were lower than those of controls; fruit firmness and titratable
acid content decreased but their levels in the treatment group were higher than those of control; SSC increased first and then
declined, but compared with the control fruits, SSC of the treated fruits decreased more slowly; SOD activity rose first and then
decreased, but was always higher in the fruited treated with UV-C than in the control ones; and MDA content in both control and
treated fruits showed an upward trend, but increased more slowly in the treated ones. Therefore, treatment with the appropriate
dose of UV-C can exert good effects on maintaining the quality and extending the storage period of harvested apple.

Key words: apple, ultraviolet-C (UV-C), storage, preservation, quality

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