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자외선 조사에 의한 버섯의 ergocalciferol(비타민 D) 함량의 증진
최성진,Choi, Seong-Jin 한국식품저장유통학회 2017 한국식품저장유통학회지 Vol.24 No.3
Ergocalciferol은 vitamin D의 활성을 가지는 것으로 알려져 있다. 본 연구에서는 팽이(Flammulina velutipes), 느타리 (Pleurotus ostreatus), 애느타리(Pleurotus ostreatus), 새송이(Pleurotus eryngii), 양송이(Agaricus bisporus), 표고(Lentinula edodes), 목이(Auricularia auricula-judae) 등 7종의 버섯을 대상으로 자외선 조사에 따른 ergocalciferol(EC, 비타민 $D_2$) 함량의 증진 효과를 조사하였다. 자외선을 조사하지 않은 버섯의 ergocalciferol 함량은 극히 낮았으나 자외선 조사에 의해 ergocalciferol 함량이 크게 증가하였으며, 자외선 A, B, C 중 특히 자외선 B가 EC 함량 증진에 효과적이었다. 버섯에서 ergocalciferol의 생성은 자외선에 직접 노출되는 부위 즉 깊이 1 mm 이내의 버섯 표면에서만 일어나는 것으로 조사되었다. 따라서 세절하지 않은 생 버섯에 자외선을 조사할 경우 팽이 버섯과 같이 체적에 비해 표면적인 넓은 종류의 버섯에서 ergocalciferol 생성이 많았고, 건조 및 세절할 경우에는 EC 생성의 기질인 ergosterol의 함량이 높은 버섯에서 ergocalciferol 생성이 많았는데, 새송이, 표고, 양송이 등이 이에 속하였다. Ergocalciferol is known as having vitamin D activity. In this study, the effects of UV irradiation on the increase of egocalciferol content were investigated in 7 kinds of mushrooms, i.e, lily mushroom (Flammulina velutipes), oyster mushroom (Pleurotus ostreatus), young oyster mushroom (Pleurotus ostreatus), king oyster mushroom (Pleurotus eryngii), button mushroom (Agaricus bisporus), shiitake (Lentinula edodes), and wood ear mushroom (Auricularia auricula-judae). Mushrooms which were not exposed to UV light contained negligible amount of ergocalciferol in all kinds of tested mushrooms, but UV irradiation increased their content of ergocalciferol. Of UV A, B and C, UV B light was the most effective to increase ergocalciferol contents. In mushrooms, the increase in ergocalciferol content occurred only in the peel within 1 mm depth from the surface, which was directly exposed to the UV light. Therefore, when fresh whole mushrooms were irradiated with UV light, lily mushroom, the mushroom with a larger surface area compared to volume, such as lily mushroom, was more favorable in producing ergocalciferol. On the other hand when the mushrooms were freeze-dried and cut, the mushrooms with a higher ergosterol, such as king oyster mushroom, shiitake or button mushroom, were more favorable in generating ergocalciferol.
노인장기요양보험제도에 대한 노인복지관 이용 노인의 인식 및 서비스 이용의향 조사
최성진(Choi, Seong Jin),박영숙(Park, Yeong Sook) 계명대학교 간호과학연구소 2009 계명간호과학 Vol.13 No.1
Purpose: This study was to identify the awareness about initial phase of senior welfare center users about long-term care insurance for the elderly(LTCIE) and their intention of using its services. Method: This study is a descriptive investigational study surveying total 204 aged people (age: 65 or older) who use 3 senior welfare center in the region of Daegu, and was also carried out under their permission for data collection. The survey tools that this study employed to determine awareness and intension about LTCIE were modified and complemented versions of survey tools developed by Kim(2006), Shin(2008) and Choi(2006). Results: 1) Respondents who heard of LTCIE : 65.2%, 2) Respondents who recognized the importance of nursing role and home aid role : 70.7% and 61.7% respectively, 3) Intention to use service: 73.0%, 6) Mean score in the intension to use each category of service: 2.58(0.92) Conclusion: By identifying changes of awareness about LTCIE and Their Intention of Using Its Services, it is expected that this study will be helpful for researchers to seek possible ways to improve awareness about LTCIE and administer LTCIE services for higher availability on practical sites.
Aminoethoxyvinylglycine 및 1-Methycyclopropene 처리에 따른 저장 ‘부유’ 단감의 에틸렌 생성, 호흡 및 과육 경도의 변화
최성진(Seong-Jin Choi) 한국원예학회 2010 원예과학기술지 Vol.28 No.2
Non-astringent ‘Fuyu’ persimmon fruits has an excellent crispy texture due to a firm flesh. The flesh, however, softens rapidly, if the fruits are exposed to an ambient temperature after low temperature storage. Softening is the most ethylene sensitive ripening response, thus in this study the ethylene production of the fruits was investigated in relation to the flesh softening. The ‘Fuyu’ fruits produced and accumulated only very small amounts of ethylene and ACC, especially during storage at low temperature. The flesh firmness was also well maintained for 4 months so long as they were stored at a low temperature. Such a reduced softening rate seems to be closely related to the inhibited ethylene production at low temperature. However, longer storage at low temperature resulted in more rapid softening when exposed to an ambient temperature. Immediately after exposure to ambient temperature, the fruits showed a transitional ethylene peak concomitantly with a respiration burst. The AVG treatment could not only inhibit the transitional ethylene production, but rather shortened the time to the initiation of climateric ethylene production. Unlike AVG, 1-MCP reduced the respiration burst and effectively retarded the softening rate at the ambient temperature.
일광에 의해 야기되는 ‘부유’ 단감의 저장 중 과피흑변
최성진(Seong-Jin Choi) 한국원예학회 2015 원예과학기술지 Vol.33 No.1
Skin blackening is a serious postharvest disorder occurring in ‘Fuyu’ persimmon fruits (Diospyros kaki, ‘Fuyu’). Phenolic content, polyphenol oxidase (PPO) and peroxidase (POD) activity, and lipid saturation were investigated in skin tissue of ‘Fuyu’ fruits. The phenolic compounds were accumulated unevenly on fruit skin depending on sunlight exposure, i.e., the most accumulation on sunny side and the least on the opposite, shaded side. The fruits harvested from shaded branches inside the canopy showed relatively even distribution of phenolic compounds in the skin. The activity distribution of PPO and POD were also uneven but only in fruits suffering f rom skin b lackening disorder, w ith the h ighest and the lowest a ctivity of PPO and P OD, respectively, in the blackened area of the fruit. When the sunny, southern sides of fruits were marked at harvesting time and fruits were stored at low temperature, a round black spot, as a symptom of skin blackening disorder, developed during storage exactly on the marked region. In addition, the sunny side of fruit showed higher lipid saturation, thus indicating adaptation to high temperature caused by the sunlight. These results suggest that the skin blackening disorder of ‘Fuyu’ fruits can be considered as a kind of chilling injury symptom that develops on the high-temperature-acclimated skin tissue of sunlight-exposed fruits when they are later exposed to low temperature.