摘要
研究"福眼"龙眼和"东壁"龙眼采后果肉自溶的差异与细胞壁代谢的关系。龙眼果实处理后,在(8±1)℃、相对湿度85%条件下贮藏,定期测定龙眼果肉自溶指数、细胞壁组分(纤维素、半纤维素、原果胶和水溶性果胶)含量以及细胞壁降解酶[果胶酯酶(PE)、多聚半乳糖醛酸酶(PG)、β-半乳糖苷酶(β-Gal)和纤维素酶(CX)]活性。结果表明:贮藏14 d后,"东壁"龙眼果肉自溶指数低于"福眼"龙眼,其果肉的纤维素、半纤维素和原果胶含量高于"福眼"龙眼,而水溶性果胶含量、PE、PG、β-Gal和CX活性则低于"福眼"龙眼。综上所述,"东壁"龙眼比"福眼"龙眼耐贮藏且不易发生果肉自溶,是因"东壁"龙眼果肉细胞壁降解酶活性较低,能减少果肉细胞壁组分降解,从而较好地维持果肉细胞壁结构的完整性。
The differences of aril breakdown between harvested ‘Fuyan＇ longan（Dimocarpus longan Lour. cv. Fuyan）and ‘Dongbi＇ longan（Dimocarpus longan Lour. cv. Dongbi）, and their relation to cell wall metabolism were investigated.The harvested longan fruit were treated and then stored at（8 ± 1）℃ and 85% relative humidity. During storage, breakdown index, contents of cell wall components including cellulose, hemicellulose, protopectin and water soluble pectin,activities of cell wall-degrading enzymes like pectinesterase（PE）, polygalacturonase（PG）, β-galactosidase（β-Gal） and cellulose（CX） in aril of harvested ‘Fuyan＇ and ‘Dongbi＇ longans were determined. As compared to ‘Fuyan＇ longans,there were lower breakdown index, lower activities of PE, PG, β-Gal and CX, higher contents of cellulose, hemicellulose and protopectin, and lower contents of water soluble pectin in aril of harvested ‘Dongbi＇ longans from day 14 to 35. The results suggested that the better storability and lower aril breakdown index in harvested ‘Dongbi＇ longans than‘Fuyan＇ longans might be due to lower activities of cell wall-degrading enzymes in aril of ‘Dongbi＇ longans, which might reduce the degradation of cell wall components, and subsequently maintain higher integrity of the cell wall structure in aril of ‘Dongbi＇ longans.
出处
《中国食品学报》
EI
CAS
CSCD
北大核心
2017年第11期181-186,共6页
Journal of Chinese Institute Of Food Science and Technology
基金
"十三五"国家重点研发计划项目(2016YFD0400102)
国家自然科学基金项目(31671914
31701653)
福建省自然科学基金项目(2015J01608
2017J01429)
福建省财政厅项目(K81MLV01A)
关键词
龙眼
果实
品种
果肉自溶
细胞壁组分
细胞壁降解酶
细胞壁代谢
longan （Dimocarpus longan Lour.）
fruit
cultivar
aril breakdown
cell wall components
cell wall-de- grading enzymes
cell wall metabolism
