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Food Technology and Biotechnology, Vol. 43 No. 4, 2005.

Original scientific paper

Effects of Pure Oxygen on the Rate of Skin Browning and Energy Status in Longan Fruit

Xingguo Su ; Institute of Economic Botany, South China Botanic Garden, The Chinese Academy of Sciences, Guangzhou LeYiJu 510650, PR China
Yueming Jiang ; Institute of Economic Botany, South China Botanic Garden, The Chinese Academy of Sciences, Guangzhou LeYiJu 510650, PR China
Xuewu Duan ; Institute of Economic Botany, South China Botanic Garden, The Chinese Academy of Sciences, Guangzhou LeYiJu 510650, PR China
Hai Liu ; Institute of Economic Botany, South China Botanic Garden, The Chinese Academy of Sciences, Guangzhou LeYiJu 510650, PR China
Yuebiao Li ; Institute of Economic Botany, South China Botanic Garden, The Chinese Academy of Sciences, Guangzhou LeYiJu 510650, PR China
Wenbin Lin ; Institute of Economic Botany, South China Botanic Garden, The Chinese Academy of Sciences, Guangzhou LeYiJu 510650, PR China
Yonghua Zheng ; College of Food Science and Technology, Nanjing Agricultural University, Nanjing WeiGang 210095, PR China

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Abstract

Postharvest pericarp browning is one of the main problems resulting in reduced shelf life of longan fruit. Experiments were conducted to examine the changes in concentrations of adenosine triphosphate (ATP), adenosine diphosphate (ADP) and adenosine monophosphate (AMP), energy charge levels and activities of polyphenol oxidase (PPO) and peroxidase (POD) in relation to pericarp browning of longan fruit. Fruit kept for 6 days in pure oxygen atmosphere at 28 C showed lower browning indices and higher ATP concentrations but lower AMP concentrations and higher respiratory rates, compared to those kept in air. While energy charge decreased during storage, the decrease was delayed markedly by exposure to pure oxygen. There was a lower energy charge in the browned fruit, which was associated with rapid increase in malondialdehyde concentration. Enhanced respiration of longan fruit exposed to pure oxygen can result in the production of ATP. However, fruit exposed to pure oxygen exhibited higher activities of PPO and POD, which was not associated with reduced skin browning inhibition. These results supported the hypothesis that skin browning of postharvest longan fruit may be a consequence of membrane injury caused by the lack of maintenance energy.

Keywords

browning; longan (Dimocarpus longan Lour.); peroxidase; polyphenol oxidase; pure oxygen; respiration

Hrčak ID:

110573

URI

https://hrcak.srce.hr/110573

Publication date:

15.12.2005.

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