期刊
FOOD QUALITY AND SAFETY
卷 3, 期 2, 页码 99-106出版社
OXFORD UNIV PRESS
DOI: 10.1093/fqsafe/fyz009
关键词
azoxystrobin; difenoconazole; red dragon fruit; dissipation; dietary risk
资金
- Standards and Trade Development Facility (STDF), World Trade Organization
- Directorate of Quality and Standardization, D. G. of Processing and Marketing for Agric, Indonesia [10993]
Background: Cultivation of red dragon fruit (Hylocereus polyrhizus) in Indonesian orchards is hampered by anthracnose and stem canker. A mixture of azoxystrobin 200 g/L + difenoconazole 125 g/L is recommended in supporting the obligated integrated pest management. For the consumer safety, dietary intake of the residues from fresh edible part should be assessed; therefore, information on correct dissipation pattern of the applied pesticide is required. Materials and Methods: Field residue trials in Indonesian highland (West Java) and coastal area (Special Region of Yogyakarta) were done at recommended dose was 0.151 kg ai/ha azoxystrobin and 0.094 kg ai/ha difenoconazole, three times at 10 days interval. Whole fruit samples were collected at 70%-100% ripeness at -1, 0, 1, 3, 7, 10, and 14 days after last application, processed and determined its residue as soon as possible. Result and Discussion: Photoisomerization of azoxystrobin was observed at Day 0, especially in coastal area; however, it has been dissipated to below lowest validated level in the following day. At Day 0, 3%-5% of the deposited azoxystrobin and difenoconazole penetrate into the flesh; however, most residues (95%-97%) were retained in peel, and dissipated in prolonged day. The dissipation pattern was non-linear. The dissipation data were better fit with bi-exponential double-first-order in parallel than single first-order kinetics model. The DT50 of both azoxystrobin and difenoconazole was 3 days. At harvest time, seventh day, only azoxystrobin residue was detected in flesh at 0.006 mg/kg; therefore, the long-term dietary risk was 0 per cent acceptable daily intake. Conclusion: Fresh red dragon fruit is safe to consume.
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