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• Effect of Postharvest Treatment With1-Methylcyclopropene on the Quality and Storage Life of Green Onionin Atmospheric Condition

  Vu Thi Kim Oanh, Vu Thi Hang

  Received: 15-10-2015 / Accepted: 05-05-2016

   Abstract PDF (VIETNAMESE)

  The aim of this study is to identify the optimum mode of postharvest treatment with 1-methylcyclopropene (1-MCP) forgreen onion (Allium fistulosum) in order to remain quality and prolong storage life at ambient condition. The two factors, concentration of 1-MCP and time exposed to 1-MCP, were taken into account. Singer factor experiment on concentration of 1-MCP was carried out first (with 6 concentrations of 0; 100; 200; 300; 400; 500ppm) along with 8 hours exposed to the chemical. Then the singer factor experiment on time exposed to 1-MCP was conducted (with 5 levels of 2; 5; 8; 11; and 14hours) along with the best 1-MCP concentration selected from previous experiment. Analyzed parameters include yellowingrates, chlorophyll, vitaminC content and their changes during storage period. The best green onion was obtained from the treatment with 200ppmfor8 hours exposed to 1-MCP. Also, two factors experiment was made in order to see interactions between them and look for the most optimal modeof 1-MCP postharvest treatmentforgeen onion. The results showed that the treatment laid on 208,9 ppm 1-MCP for 7 hours 44 minutes gave highest quality green onion in atmospheric condition.

• The Effects of postharvesttreatment with 1-Methylcyclopropene on Quality and Losses of Avocado Fruits in Storage

  Nguyen Minh Nam, Pham Anh Tuan, Pham Thi Thanh Tinh

  Received: 25-09-2012 / Accepted: 21-08-2012

   Abstract PDF (VIETNAMESE)

  A study was caried out to examine the effect of post-harvest treatment with 1-methylcyclopropene on avocado fruits in storage. The avocado fruits(Persea americana Mill.) at 20 weeks after flowering were harvested from orchard in Kam Leo, Thang Hoa, Daklak province in year 2011. The quality of avocado fruits was identified in terms of the firmness at 35.50 kg/cm2. Total sugar content of 7.20%, total acid content of 0.05%, vitamin C content of 68 mg%. The avocado samples were exposed with 1-MCP at the concentrations: 300ppm, 400ppm, 500ppm, 600ppm, 700ppm during the time of 12, 15, 18, 21, 24 hours, then kept at ambient temperature ( 25 to 300C; RH of 85 to 90%). Research results of single factors show that the quality of avocado fruits exposured with 1-MCP at the concentration of 500ppm during 12 hours is the best, which has weight losses lower than 10% compared with other samples after 12-day storage. Research results of multi-factor show that weight loss is lowest after 12 day storage when the concentration of 1-MCP for preserving avocado is 500 ppm and the time of 1-MCP treatment is 13hours30mins.

• Effects of Hot Water Treatment Combining with 1-Methylcyclopropene (1-MCP) on Storage Time after Harvest of Passion Fruit (Passiflora edulisSims)

  Le Van Luan, Nguyen Thi Diem Huong, Tran Thi Kim Nhi, Nguyen Van Toan

  Received: 26-07-2021 / Accepted: 27-05-2022

   Abstract PDF (VIETNAMESE)

  Passion fruits after harvest were treated with hot water atdifferent temperatures (44C, 48C and 52C) for 5 minutes and soaked in 1-Methylcyclopropene solution (440ppb, 490ppb and 540ppb) during 80 seconds. After drying, the fruits were placed in styrofoam trays inside carton boxes and stored at 5 ± 1C, 80-90% r.h. The treatments withouthot water and 1-MCP treatments were used as the control. Results showed that the treatments with hot water treatment at 48C for 5 minutes combining with 1-MCP at 490ppb for 80 seconds gained the climacteric respiration peak and had ethylene production later than control treatment. The study also identified the quality indicators of passion fruit after 39 storage days under the above conditions, i.e. soluble dry matter content 17.803%, vitamin C content 34.967 mg/100g; and total phenolic content 55.044 ml/100l.

• Effect of 1-Methylcyclopropene on the Storage Life of Litchi Fruits (Litchi sinensis Sonn.)

  Nguyen Thi Bich Thuy, Nguyen Phan Thiet

  Received: 15-04-2012 / Accepted: 24-07-2012

   Abstract PDF (VIETNAMESE)

  The objective of this study was to determine the effiect of 1-MCP, an inhibitor of cell ethylene receptor, at various concentrations on preseved litchi fruits (Litchi sinensis Sonn.. cv. Thieu). The fruits were harvested from the local orchards in Bac Giang and transported to laboratory within 3 hours. Maturity-uniform litchi fruits without any defects were selected and treated with 1-MCP at the concentrations of 0.300 and 600 ppb for 12 hours. Following treatment, litchi fruits were kept at 4°C for storage. The results indicated that 1-MCP has positive effect on maintaining the quality of litchi fruits cv. Thieu. The most effective treatment to preserve the litchi quality after storage was 600 ppb 1-MCP for 12 hours. This concentration reduced weight loss and delayed changes of skin color and browning, minimised the loss of TSS, sugar and vitamin C content within 1 month storage.

• Effect of Postharvest Treatment of 1-Methylcyclopropene (1-MCP) on (Storage) Quality of ‘Savior’ Tomato Grown in Summer

  Nguyen Minh Viet Thao, Maarten L A T M Hertog, VuThi Kim Oanh, Bart Nicolai, Tran Thi Dinh

  Received: 29-05-2022 / Accepted: 21-10-2022

   Abstract PDF (VIETNAMESE)

  The aim of the study was to investigate the effect of 1-MCP on fruit quality of ‘Savior’ tomato grown in summer (off-season) during postharvest storage. Tomatoes at mature green stage wereharvested,treated with 1-MCP at 5 µl.l-1at 18C for 24h, and then stored at 18C. The results showed that the degreening, softening, and the respiration rate were retarded in 1-MCP treated tomatoes compared to the control fruit. Furthermore, 1-MCP increased the acidity of the fruit. Theeffect of 1-MCP as ripening retardant at a concentration of 5 µl.l-1can be applied for post-harvest preservation of summer-grown 'Savior' tomatoes.