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Taye, Adanech Melaku,Tilahun, Shimeles,Park, Do Su,Seo, Mu Hong,Jeong, Cheon Soon Korean Society of Horticultural Science 2017 원예과학기술지 Vol.35 No.3
'Unicon' cherry tomato (Solanum lycopersicum) is one of the most highly perishable horticultural crops due to its high water content and respiration rate. This study was carried out to assess the effect of continuous application of $CO_2$ (control [air], 3%, and 5%) on the quality and shelf life of cherry tomato fruits stored at $10^{\circ}C$ and $85{\pm}5%$ relative humidity (RH) at two maturity stages (pink and red). Continuous application of $CO_2$ did not affect the soluble solids content (SSC) or titratable acidity (TA) of the fruit at either maturity stage during storage. However, there was a significant difference among treatments in terms of flesh firmness, cell wall thickness, pectin content, vitamin C content, skin color, lycopene content, weight loss, ethylene production rate, respiration rate, and acetaldehyde and ethanol production. Fruits treated with 5% $CO_2$ maintained their high quality with regards to vitamin C, skin color ($a^*$), lycopene content, weight loss, physiological parameters (ethylene production rate, respiration rate, and volatile compounds), flesh firmness, cell wall thickness, and pectin content at both maturity stages compared with 3% $CO_2$ treatment and the control. Continuous application of $CO_2$ (5%) reduced the ethylene production rate and the production of volatile compounds during storage. Therefore, cherry tomato 'Unicon' fruit can be stored for two weeks without losing fruit quality at both maturity stages under continuous application of 5% $CO_2$ as a postharvest treatment.
Adanech Melaku Taye,Shimeles Tilahun,Do Su Park,Mu Hong Seo,Cheon Soon Jeong 한국원예학회 2017 원예과학기술지 Vol.35 No.3
‘Unicon’ cherry tomato (Solanum lycopersicum ) is one of the most highly perishable horticultural crops due to its high water content and respiration rate. This study was carried out to assess the effect of continuous application of CO₂ (control [air], 3%, and 5%) on the quality and shelf life of cherry tomato fruits stored at 10°C and 85 ± 5% relative humidity (RH) at two maturity stages (pink and red). Continuous application of CO₂ did not affect the soluble solids content (SSC) or titratable acidity (TA) of the fruit at either maturity stage during storage. However, there was a significant difference among treatments in terms of flesh firmness, cell wall thickness, pectin content, vitamin C content, skin color, lycopene content, weight loss, ethylene production rate, respiration rate, and acetaldehyde and ethanol production. Fruits treated with 5% CO₂ maintained their high quality with regards to vitamin C, skin color (a*), lycopene content, weight loss, physiological parameters (ethylene production rate, respiration rate, and volatile compounds), flesh firmness, cell wall thickness, and pectin content at both maturity stages compared with 3% CO₂ treatment and the control. Continuous application of CO₂ (5%) reduced the ethylene production rate and the production of volatile compounds during storage. Therefore, cherry tomato ‘Unicon’ fruit can be stored for two weeks without losing fruit quality at both maturity stages under continuous application of 5% CO₂ as a postharvest treatment.
Shimeles Tilahun,박도수,Adanech Melaku Taye,정천순 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.2
This study was conducted to assess the physicochemical changes and overall nutritional implications of greenhouse-grown “TY Megaton” and “Yureka” tomato cultivars under on-vine and postharvest ripening conditions. In the first group, tomatoes were harvested from a vine at the breaker, pink, and red ripening stages and sampled immediately. The second group was harvested at the breaker stage and allowed to ripen under room conditions to the pink and red stages based on color values, similar to the vine-ripened samples. The results of the present study revealed that fresh weight loss was below the maximum acceptable weight loss and firmness was above the minimum limit of marketing after postharvest ripening to the pink and red stages; moreover, this process did not have any deleterious effect on the antioxidant properties or antioxidant activity of the tomatoes. Hence, the results clearly indicate that breaker-stage tomatoes can be postharvest-ripened under room conditions without affecting their marketability and nutritional components.
Shimeles Tilahun,Do Su Park,Adanech Melaku Taye,Cheon Soon Jeong 한국원예학회 2017 원예과학기술지 Vol.35 No.1
This study explored the physicochemical and nutritional changes associated with storage duration of fresh tomatoes. Fruits of the ‘TY Megaton’ and ‘Yureka’ tomato cultivars were harvested at the pink stage and stored at 12℃ for 20 days. During storage, firmness, weight loss, skin color (Hunter L, a, b, a / b values), soluble solids content (SSC), titratable acidity (TA), pH, antioxidant contents (lycopene, ascorbic acid, and total phenolics) and antioxidant activity were evaluated. Firmness was above the minimum marketable limit and fresh weight loss was below maximum acceptable weight loss after 3 weeks of storage, and no deleterious effect on antioxidant contents or activities were observed. Significant differences in SSC, TA, and pH were seen between varieties, but not between fruits stored for different durations. In both varieties, Hunter a values increased more than five-fold after 8 days of storage; this correlated with a more than four-fold accumulation of lycopene after two weeks of storage. The antioxidant activity of tomatoes was highest at the beginning of the storage period, likely because of the effective DPPH - reducing power of ascorbic acid and total phenolics. Antioxidant activity increased after 12 days of storage because of increasing lycopene content. Hence, this study indicates that pink - stage tomatoes may be stored at 12℃ for up to 3 weeks without affecting marketability or nutritional value.