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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
- Source :
- Journal of agricultural and food chemistry. 49(2)
- Publication Year :
- 2001
-
Abstract
- 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 color changes (L* and a*), and cluster weight loss were evaluated at 0 °C for 8, 16, 32, and 56 days. 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 color changes followed the same pattern for CM and PM. After 32 days 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 days of storage regardless of cluster maturity. Keywords: Polyphenol oxidase; table grapes; rachis, dar...
- Subjects :
- Cytokinins
Time Factors
Food Handling
Pyridines
Flame Seedless
Color
Forchlorfenuron
Polyphenol oxidase
chemistry.chemical_compound
Dry weight
Botany
Browning
Desiccation
Rosales
Catechol oxidase
biology
Plant Stems
Phenylurea Compounds
Table grape
General Chemistry
biology.organism_classification
Maillard Reaction
Horticulture
chemistry
Postharvest
biology.protein
General Agricultural and Biological Sciences
Catechol Oxidase
Subjects
Details
- ISSN :
- 00218561
- Volume :
- 49
- Issue :
- 2
- Database :
- OpenAIRE
- Journal :
- Journal of agricultural and food chemistry
- Accession number :
- edsair.doi.dedup.....acbdc7819f795605f26c7e58a8bd9c23