In this study, a controlled atmosphere (CA) storage system is proposed as a storage method for prolonging processing period. Persimmon was placed in CA storage at 0.5oC±0.5 for 92 d. The qualities of the stored persimmons were compared to determine the possibility of extending shelf life. ‘Sangjudungsi,’ which was harvested on October 26, 2017, was applied to the persimmons. In order to compare differences according to size, the persimmons were classified into Size No. 2 (170 g) and Size No. 3 (145 g). In the result, the yellowness of CA-stored persimmons was 26.3% lower than that of cold-stored ones, confirming that after-ripening was delayed. The firmness of CAstored and Size No. 3 persimmon was higher than that of cold-stored and Size No. 2 persimmon. Tannin decreased significantly in cold storage, but it tended to increase in CA storage. The sugar content of Size No. 3 was lower than that of Size No. 2, but there was no difference in tendencies according to the storage method. Weight loss in CA storage was lower than that in cold storage. A comparison of color difference, firmness, sugar content, tannin, and weight loss ratio showed that CA storage was more effective in improving shelf life than cold storage.

The O2 and CO2 concentrations in controlled atmosphere (CA) rooms are determined by the respiration of produce like apples and the airtightness of the CA room, with gas in the CA room controlled by O2 and CO2 removal as well as respiration (CO2 increase and O2 decrease). The purpose of this study was to evaluate the validity of the gas exchange model for O2 removal, CO2 removal, the rate of O2 decrease and CO2 increase by respiration of apples, and airtightness of the CA room. It took 17.5 hours to reduce O2 concentration from 20.9% to 2.0% after loading 4.3 tons of Fuji apples into the CA room, which was 4.2 hours longer than the 13.3 hours of the model formula. After the CO2 concentration rose to 0.5% due to respiration, it took 4.7 hours to lower the CO2 concentration to 0.2%, which was 0.6 hours longer than that of the model equation. The rate of CO2 increase by respiration was 0.021%/ h, which was similar to the model equation (0.017%/h). Also after 4.7 hours, the O2 concentration decreased by 0.1% which was also in line with the model equation (0.13%/h).

This study was conducted to propose the conditions of controlled atmosphere (CA) storage suitable for the storage of winter Chinese cabbage and to investigate the maximum storage period of Chinese cabbage based on the results of the quality analysis for CA storage. The weight loss rate of Chinese cabbage stored at 194 days in low temperature storage was about 2 times higher than that in CA storage. The trimming loss rate of Chinese cabbage stored at low temperature was 1.5 times higher than that of CA storage after 83 days of storage. Bolting of Chinese cabbage was observed in only low temperature storage. The Chinese cabbage firmness of CA storage was not different in the range of 5.7-6.2 N, while low temperature storage gradually increased after 83 days of storage and was 7.5 N at 194 days. The incidence of mold occurred after 83 days in low temperature storage, while in CA storage it occurred after 153 days. In the quality evaluation, CA storage for Chinese cabbage was rated 1.5-1.9 points higher than the low temperature storage. The maximum storage period of Chinese cabbage at low temperature storage was 83 days and that at CA storage 153 days.

This study was carried out to indirectly predict the storage time limit, hardness, and acidity of Fuji apples in controlled atmosphere (CA) storage. A sensor installed inside the CA storage measured temperature, relative humidity, and gas composition data in real time. The respiration rate from five tons of apples in CA storage was calculated to predict the weight loss rate. As a result, the predicted and actual weight loss rate induced a predictable residual storage time equation that showed a significantly high correlation. The apple storage period showed a high reliability (R2=0.9322) because the predicted equation using respiration rate and number of days stored was about nine months for five tons of apples. Furthermore, the hardness and acidity prediction equation were derived from the quality analysis. However, there was not enough analysis sample correlation (the coefficient was as low as 0.3506 and 0.3144, respectively), but the tendency could be confirmed by reduced hardness and acidity. As a result, these quality prediction equations could encourage CA container distribution, effective for agricultural shipment regulation and increasing the ease of operations.

This study was conducted to develop and evaluate an appropriate control device for a purge type controlled atmosphere (CA) storage in Korea. To determine ideal performance, oxygen and carbon dioxide control capability and airtightness were analyzed according to the postharvest management manual of CA storage of Fuji apples. In shortened experiments for CA storage, the condition was delayed CA at 0-0.5oC for three days and stored at 0.1-0.5% carbon dioxide levels for 3 days and then further stored 6 days under 1% carbon dioxide. As a result, the temperature control range of a developed CA container was 0.0-0.5oC, and the relative humidity was more than 90%, except for the defrosting step for the freezer during the storage period. The rate of pressure reduction for the CA container in the negative and positive pressure states was 0.45 and 0.21 mmH2O/min, respectively, and it was twofolds higher than standard airtightness for CA storage. After nitrogen injection, oxygen concentration was achieved at 2%, and carbon dioxide concentration was maintained at 0.1-0.5% for 6 days. Afterwards, carbon dioxide levels were tightly controlled between 0.1-1.0%. These results suggest that a developed purge type CA container could be effective in commercially maintaining the quality of agricultural products.

This study was conducted to develop the domestic production of a controlled atmosphere (CA) storage system, including nitrogen generator and carbon dioxide eliminator using selective gas separation membrane and operating program. Generally, the gas composition inside general cold stores constantly changes due to the metabolic activity of the respiring vegetables and fruits and leakage of gases through doors and walls. However, the CA container developed by our research team is able to control of the level of oxygen and carbon dioxide inside the reefer, making it simple and effective in operation. The efficiency of the nitrogen generator to replace oxygen with nitrogen inside the CA container was approximately 1.33% per hour. The change in oxygen concentration inside the CA container during the operation refrigerator almost did not show any difference for 8 days. Therefore, CA storage container should be a promising approach to maintaining the high quality of agricultural products during storage.

The quality properties of peeled ginger (PG) were investigated during CA storage at different CO₂concentrations. O₂ concentration was kept constant at 5% while CO₂of 6%, 14%, 22% and 30% were used. It was found that the weight loss rate tended to decrease with an increase of CO₂. In the case of fixed 10 ℃ storage, the Lvalue and a-value of the exterior color in treatment increased more than that of control with respect to time, while the b-value of the exterior color and the cutting plane color showed no significant difference. In the exterior color, the results of PG-25 ℃ showed similar with PG-10 ℃ except b-value of the exterior color which showed not a little change. The cutting plane color did not showed significantly difference in the PG samples between 25 ℃ and 10 ℃ . Hardness of the PG during storage was found to decrease most severely at 6% of CO₂concentration regardless of storage temperature. The growth of microorganisms during storage of the PG tended to be restrained as CO₂concentration increased. However, microorganisms, when maintained at 25 ℃ storage, multiplied rapidly to 10^8 CFU/g within 4 days regardless of concentration.

This study was conducted to investigate the change in the quality of early season Fuji apples that were subjected to eight different storage conditions using the developed controlled atmosphere (CA) storage system. Early season Fuji apples grown at Mungyeong, in the South Korea, were harvested in September 2014 for storage studies. Flesh firmness, titratable acidity, total soluble solid content, weight loss, and internal browning disorder were used as quality indicators for the stored apples. Flesh firmness and weight loss were better than that of the control after 70 days of storage. However, there was no significant difference in the titratable acidity or total soluble solid content among the apple samples from eight chambers after storage. The internal browning disorder of apple samples in CA chambers occurred when exposed to 1% CO2+2% O2 and 1% CO2+0.5% O2, resulting in a higher incidence rate of 2 and 8% after 70 days of storage than that in the control. In addition, the CA storage conditions at 3, 4 and 5% CO2+2% O2 increased the rate of internal browning disorder by 26%. Therefore, CA storage can be used to maintain the quality of the apple if the optimal gas concentrations in the CA are applied to the storage strategy.

방울 토마토의 환경기체조절 저장 중 품질특성을 측정하기 위하여 대조구인 air 저장구를 포함하여 7개의 저장조건에서 저장실험을 수행하였다. 저장기간 중 방울 토마토의 중량 감소율은 저장기간이 경과함에 따라 감소하였다. CA 저장구에서는 초기 중량의 90%를 유지하였으나, air 저장구에서는 초기중량의 85%를 유지하는 것으로 나타났다. 저장 중 적정 산도의 변화는 저장 기간이 경과함에 따라 계속적으로 감소하는 경향이었다. air 저장구와 6.4%

CA저장에 적합한 떫은감 품종을 선발하기 위해 청도반시, 사곡시, 고종시, 봉옥시 4품종을 공시하여 농도를 12, 16%로 하였으며 농도는 같이 3%로 하여서 약 160일간 저장하여 품질변화를 조사한 결과는 다음과 같다. 가용성 고형분 함량은 저장기간이 경과함에 따라 거의 변화가 없거나 감소하였으며, 청도반시, 사곡시, 고종시는 12%, 16% 모두 일반 저온저장고와 비슷한 수준이었으나, 봉옥시는 고농도의 로 가용성 고형분의 감소가 현저하였다.

폴리이미드 고분자막을 사용한 질소부하 장치를 설계하고, 이를 CA 저장에 활용하기 위한 기술적 기본 데이터를 제시하였다. 순수 산소 및 질소의 투과특성은 dual-mode sorption 모델로서 설명될 수 있었으며, 공기 중의 산소의 투과율은 공기 중에 존재하는 질소의 영향으로 순수 산소의 투과율에 비해 크게 감소하나, 공기 중의 질소의 투과율은 산소의 영향으로 순수 질소의 투과율에 비해 증가하였다. 수행한 압력 및 온도 범위 내에서 이상분리인