Changes in pectin methyl esterase activity with different packaging materials and stages of fruit harvesting during cold storage of pear cv. Punjab beauty

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• 作者：Kirandeep Kaur ; W. S. Dhillon ; B. V. C. Mahajan
• 关键词：Pear (Pyrus communis) ; Fruit ripening ; Pectin ; Pectin methyl esterase ; Firmness
• 刊名：Journal of Food Science and Technology
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：51
• 期：10
• 页码：2867-2871
• 全文大小：213 KB
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• 作者单位：Kirandeep Kaur (1)
  W. S. Dhillon (1)
  B. V. C. Mahajan (1)
  
  1. Department of Horticulture, Punjab Agricultural University, Ludhiana, 141 004, Punjab, India
  
• ISSN：0975-8402

文摘

Pear cv. Punjab Beauty has become quite popular in Punjab. Excessive softening during cold storage leading to low shelf life is the major factor limiting its wider adoption. Studies were, therefore, conducted to determine the firmness and pectin methyl esterase (PME) activity at 4 harvest dates (2nd, 3rd and 4th week of July, and 1st week of August). Various packaging materials i.e. corrugated fiber board boxes and crates with high and low density polyethylene liners, corrugated fiber board boxes, crates and wooden boxes were also evaluated for their role in extending the shelf life of fruits. The enzyme activity and fruit firmness was evaluated periodically after 30, 45, 60 and 75?days of storage at 0-?°C and 90-5?% RH. The firmness of the fruits decreased with the increase in storage intervals but the enzyme activity increased with the storage period up to 60?days and declined thereafter. Ripening-related changes in all the harvests were characterized mainly by an increase in the solubilization of pectin with a concomitant decrease in the degree of firmness. There was a continuous increase in enzyme activity with the advancement in harvesting dates and then fell sharply in the advanced ripening stages. Highest pectin methyl esterase activity was in fruits packed in crates followed by wooden boxes and corrugated fiber board boxes while the lowest was recorded in fruits packed in corrugated fiber board boxes with high density polyethylene liners. Therefore, high density polyethylene lined CFB boxes proved to be most effective in preventing the loss in firmness.