บทคัดย่องานวิจัย

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Polyphenol oxidase activity, color changes, and dehydration in table grape rachis during development and storage as affected by N-(2-chloro-4-pyridyl)-N-phenylurea.

Carvajal-Millan, E.; Carvallo, T.; Orozco, J. A.; Martinez, M. A.; Tapia, I.; Guerrero, V. M.; Rascon-Chu, A.; Llamas, J.; Gardea, A. A.;

Journal of Agricultural and Food Chemistry Year: 2001 Vol: 49 Issue: 2 Pages: 946-951 Ref: 25 ref.

2000

บทคัดย่อ

Polyphenol oxidase activity, color changes, and dehydration in table grape rachis during development and storage as affected by N-(2-chloro-4-pyridyl)-N-phenylurea.

Flame Seedless grapes were sprayed with N-(2-chloro-4-pyridyl)-N-phenylurea (CPPU) at 0, 2.5 and 5.0 ppm to develop rachis resistant to browning and dehydration. Rachis polyphenol oxidase (PPO) activity was determined during cluster development. Cluster components were weighed at commercial (CM) and physiological maturity (PM). PPO activity, rachis colour changes (L* and a*) and cluster weight loss were evaluated at 0 deg C for 8, 16, 32 and 56 d. CPPU-treated rachis had a decrease of 36% in PPO activity and a week delay in peak activity. At PM, dry weight of CPPU-treated rachis increased by 3 g. Postharvest rachis PPO activity declined with CPPU application and colour changes followed the same pattern for CM and PM. After 32 d of storage, L* and a* in lateral branches were significantly superior in CPPU treatments. Weight losses below 2.1% were significantly lowest in CPPU-treated clusters for 16 d of storage regardless of cluster maturity.