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큰느타리버섯의 신선도 유지기간 연장을 위한 CO<sub>2</sub> 처리 효과
이지현,최지원,홍윤표,최현진,김지강,Lee, Ji-Hyun,Choi, Ji-Weon,Hong, Yoon-Pyo,Choi, Hyun-Jin,Kim, Ji-Gang 한국버섯학회 2014 한국버섯학회지 Vol.12 No.4
큰느타리버섯은 장거리 해상운송 후 갈변 및 조직 물러짐에 의한 품질저하가 클레임의 원인이 되는데, 수출 중 신선도 유지를 위한 전처리 기술을 개발하고자 $CO_2$ 처리의 효과를 검증하였다. 버섯의 수확후 $5^{\circ}C$에서 30, 50% 농도의 $CO_2$를 3시간 처리하고 관행적인 방법으로 필름포장한 다음 $20^{\circ}C$와 $5^{\circ}C$에 저장하며 무처리와의 품질을 비교분석하였다. $CO_2$ 처리구는 무처리에 비해 저장 중 조직 경도와 색도(Hunter 'L', 'b')를 유지하였고, 관능평가에서도 품질이 급격히 저하되는 저온저장 3주차에 조직물러짐 정도와 갈변지수가 낮아 신선도 유지에 효과가 있었다. $CO_2$ 처리 농도 중 30% 처리구가 50%에 비해 상품성이 높았으며 무처리에 비해서는 $5^{\circ}C$에서 약 1주일간 신선도 유지기간이 연장되었다. 따라서 큰느타리버섯의 장거리 해상운송 중 품질유지를 위한 전처리 방법으로 $CO_2$ 처리가 효과가 있는 것으로 판단되며 현장적용을 위해 효과가 있는 $CO_2$ 처리농도의 범위 및 장해를 유발하는 한계농도의 설정과 처리시간 등 추가적인 실험이 요구된다. King oyster mushrooms(Pleurotus eryngii) are the second biggest mushroom for exporting in Korea but their browning and soft rot is the main factors of claim during long distance transportation. Fresh king oyster mushrooms were treated with $CO_2$ at 30, 50% for 3 hours at $5^{\circ}C$ prior to storage at $20^{\circ}C$ and $5^{\circ}C$. There was no difference on respiration rate after $CO_2$ treatment. However exposure to $CO_2$ for 3h prior to MA packing maintained the firmness and delayed color(hunter L and b value) change of mushrooms during storage. Especially an incubation in high $CO_2$ at 30% significantly reduced soft rot and browning symptoms resulting in one week extension of shelf-life during storage at $5^{\circ}C$ compared to control and 50% $CO_2$ treatment.
이지현,김영소,이종길,이혁구,한성순,Lee, Ji-Hyun,Kim, Young-So,Lee, Chong-Kil,Lee, Hyuk-Koo,Han, Seong-Sun 한국생약학회 1999 생약학회지 Vol.30 No.1
To search for less toxic antiherpetic agents, the inhibitory effects of twelve kinds of flavonoids including chrysin, quercetin, quercitrin, rutin, fisetin, gossypin, kaempferol, morin, naringenin, naringin, hesperetin and hesperidin on the plaque formation of herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2) in Vero cells were examined by plaque reduction assay in vitro. Some flavonoids tested in this study showed potent antiherpetic activity, reducing intracellular replication of herpes simplex viruses when Vero cell monolayers were infected and subsequently cultured in medium containing flavonoids. Naringenin showed the most potent antiviral activity against HSV-1 with selectivity index (SI) of 19.1 and hesperetin showed the most potent antiviral activity against HSV-2 with SI of 9.8. These results suggest that some flavonoids may be a potential therapeutic agent for the treatment and prevention of herpes simplex virus infections.
이지현,박혜영,원주인,박혜인,최인덕,이석기,박지영,조동화,전용희,오세관,한상익,최혜선,Lee, Ji Hyun,Park, Hye Young,Won, Ju In,Park, Hye In,Choi, In Duck,Lee, Seuk Ki,Park, Ji Young,Joe, Dong Hwa,Jeon, Yong Hee,Oh, Sea Kwan,Han, Sang Ik,Ch 한국식품저장유통학회 2017 한국식품저장유통학회지 Vol.24 No.6
Yogurt is produced by fermentation of milk using bacteria known as "yogurt cultures". Most of these bacteria are probiotics such as Lactobacillus delbrueckii subsp. bulgaricus, Lb. rhamnosus, Streptococcus thermophilus, and Bifidobacterium. The domestic fermented milk market is increasing, and about 30 companies are producing yogurt. The purpose of this study was to analyze the quality characteristics of domestic commercial liquid yogurt. Total 30types of commercial yogurts were sampled and their physicochemicial properties, including pH, sugar content, acidity, viscosity, and microbial characteristics of lactic acid bacteria counts, were measured. Commercial liquid type yogurt showed a pH of 4.5, sugar content of 7.4-21.2%, total acid content of 0.4-0.9%, and viscosity of 0.1-250 cP. In terms of microbial populations, lactic acid bacteria counts were 7.2-11.3 log CFU/mL and anaerobic lactic acid bacteria counts were 8.0-11.5 log CFU/mL. The quality characteristics differed depending on the constituents of the sample and the microorganisms used. These results are related to the quality characteristics of yogurts and are useful for identifying new trends in the domestic fermented milk industry. 요구르트는 유산균을 이용하여 제조한 대표적인 유발효식품이다. 국내 유통되고 있는 요구르트는 약 30개의 업체에서 생산되고 있으며, 최근 당 저감화 정책 실시로 저당제품이 출시되고 있다. 본 연구는 국내 시판되고 있는 액상타입의 요구르트를 수집하여 제품의 일반적인 특성을 조사하였고, pH, 산도, 당도, 점도, 호기성 혐기성 유산균수를 측정하여 기초자료로 사용하고자 하였다. 탈지분유(97%) 및 원유(57%)가 주된 원료로 높은 빈도로 사용되고 있으며, 발효스타터는 요구르트에 100% 이용되고 있으며 주로 수입균주가 이용되고 있다. 당은 sucrose, oligosaccharide, xylitol이 첨가되었고, 그 외 구연산, vitamin C, gum류 등이 요구르트의 기능성과 물성 등을 개선하고자 하는 부원료로 사용되고 있는 것을 확인하였다. 30종의 요구르트의 품질특성을 분석한 결과 pH는 3.6-4.6, 당도는 7.4-21.2%, 총산도는 0.4-0.9%, 호기성 유산균수 7.2-11.3 log CFU/mL, 혐기성 유산균수는 8.0-11.5 log CFU/mL로 분석되었다. 본 연구에서 도출된 시판 액상타입 요구르트의 품질분석 결과는 다양한 소재를 접목한 요구르트 개발의 품질규격설정의 기초자료로 유용 할 것으로 사료된다.
이지현,김은영,노수진,박용진,정지연,Lee, Ji-Hyun,Kim, Eun-Young,Noh, Su-Jin,Park, Yong-Jin,Jeong, Jee-Yeon 한국환경보건학회 2011 한국환경보건학회지 Vol.37 No.1
Crocidolite quality control (QC) sampling created by the wet generation method has been validated by validation tests such as the accuracy, precision, and storage tests. For this study we designed and developed a manufacturing apparatus and standard operating procedure for making these QC samples. The most important step in the procedure of making QC samples was the stage eliminating static electricity in asbestos fibers. This static electricity hampers the fibers clog functioning. In accuracy and precision tests by phase contrast microscopy analysis, the difference between the reference values and the studied values was at maximum 17.8%. This satisfies the AIHA proficiency analytical test criteria for asbestos. We could confirm the nearly even distribution of crocidolite fibers on the membrane filter. Also, there was no loss of fibers in the storage test after the one month.
이지현,정연화,조봉혜,황대석,Lee, Ji-Hyun,Jung, Yun-Hoa,Cho, Bong-Hae,Hwang, Dae-Seok 대한영상치의학회 2010 Imaging Science in Dentistry Vol.40 No.1
Purpose : The purpose of this study was to evaluate the diagnostic efficacy of panoramic radiographs for detection of mandibular fractures. Materials and Methods : The sample was comprised of 65 patients (55 fractured, 10 non-fractured) with 92 fracture sites confirmed by multi-detector computed tomography (CT). Panoramic radiographs were evaluated for mandibular fractures by six examiners; two oral & maxillofacial radiologists (observer A&B), two oral & maxillofacial surgeons (observer C&D), and two general dentists (observer E&F). Results : Sensitivity of panoramic radiography for mandibular fractures was 95.7% in observer A&B, 93.5% in observer C&D and 80.4% in observer E&F. The lowest sensitivity was shown in symphyseal/parasymphyseal areas, followed by subcondylar/condylar regions. Conclusion : Panoramic radiography is adequate for detection of mandibular fractures. However, additional multidetector CT is recommended to ascertain some indecisive fractures of symphysis and condyle, and in complicated fractures.
Molecular Structure of PCP Pincer Complexes: Poisoning Catalyst on the Dehydrogenation of Alkanes
이지현,전상진,권기혁,이도원,Lee Ji Hyun,Chun Sang Jin,Kwon Ki Hyeok,Lee Do Weon Korea Crystallographic Association 2005 韓國結晶學會誌 Vol.16 No.1
알칸화합물(alkanes)에서 탄소-수소결합을 활성화시켜서 더욱 값이 비싸고 더 유용한 알켄화합물(alkenes)로 만들 수 있는 촉매를 만들고자 지난 수 십 년간 많은 화학자들이 연구해왔다 이러한 목적의 하나로서 두개의 수소를 가지는 이리디움 P-C-P핀서(pincer) 착물 $(IrH_2{C_6H_3-2,6-(CH_2PBu_2^t)_2})$을 성공적으로 합성하였다. 이 착물은 알칸의 탈수소화반응(dehyrogenation)에 아주 효과적인 촉매로 알려졌다 알칸의 탈수소화반응에 촉매독으로 작용하는 질소, 물, 이산화탄소 및 일산화탄소와 같은 작은 화합물들과 직접 반응시켜서 어떻게 촉매독으로 작용하는지를 알아봤다. 촉매독으로 작용할 수 있는 화합물들을 합성하여 핵자기공명분광법(NMR)과 적외선분광법(IR)으로 확인하였고 분자구조를 알아보기 위해서 단결정X-ray 회절법을 통하여 확인하였다. 본 논문에서는 촉매 및 촉매독물질의 합성과 분자구조와 각각의 화합물의 반응성과 특이성을 알아보았다. The dihydrido P-C-P pincer complex, $IrH_2{C_6H_3-2,6-(CH_2PBu_2^t)_2}$ (1), was successfully prepared from the reaction of the hydrochloride complex, $IrClH (C_6H_3-2,6-(CH_2PBu_2^t)_2}$, and super acid $(LiBEt_3H)$ under 1 atm of hydrogen in pentane solution at room temperature and followed by Heating at $130^{\circ}C$ in vacuo. Jensen recently found that the dihydrido P-C-P pincer complex 1 is a highly active homogeneous catalyst for the transfer dehydrogenation of alkanes with unusual longterm stability at temperatures as high as $200^{\circ}C$. The treatment of dihydrido complex 1 with nitrogen, water, carbon dioxide, and carbon monoxide in presence of tert-butylethylene (the) at room temperature in an appropriate solution gave the dinitrogen complex, $[Ir{C-6H_3-2,6-(CH_2PBu_2^t)_2}]_2({\mu}-N_2)$ (2), the hydrido hydroxyl complex, $IrH(OH){C_6H_3-2,6-(CH_2PBu_2^t)_2}$ (3), the carbon dioxide complex, $Ir({\eta}^2-CO_2) {C_6H_3-2,6-(CH_2PBu_2^t)_2}$ (including the bicarbonate complex, $IrH({\kappa}^2-O_2COH){C_6H_3-2,6-(CH_2PBu_2^t)_2}\;(4))$, and the carbonyl complex, $Ir(CO) {C_6H_3-2,6-(CH_2PBu_2^t)_2}\;(5)$ (including the carboxyl complex, $IrH(C(O)OH) {C_6H_3-2,6-(CH_2PBu_2^t)_2}\;(6))$, in good yield, respectively. These P-C-P iridium complexes were isolated and characterized by $^1H,\;^{13}C,\;^{31}P\; NMR$, and IR spectroscopy. In addition, the complexes (1-6) were characterized by a single crystal X-ray crystallography. These complexes account for these small molecules' inhibition of dehydrogenation of alkanes catalyzed by the dihydrido complex 1.
살균수 발생장치에 의해 생성된 양치용액이 치주질환에 미치는 효과
이지현,윤정호,최성호,조규성,Lee, Ji-Hyun,Yun, Jeong-Ho,Choi, Seong-Ho,Cho, Kyoo-Sung 대한치주과학회 2004 Journal of Periodontal & Implant Science Vol.34 No.3
The aim of this study was to evaluate the clinical efficacy of mouthrinses prepared by sterilized water-generating $device(Purister^{(R)})$ on the control of gingivitis and incipient periodontitis when it was used as a adjunctives to the mechanical plaque control. 40 healthy patients with gingivitis or incipient periodontitis were divided into two groups. Patients in the experimental group use mouthrinses prepared by sterilized water-generating $device(Purister^{(R)})$ after tooth brushing while patients in the control group do only tooth brushing for plaque control. All patients received scaling and tooth brushing instruction. 1 week after scaling was set as baseline. Probing pocket depth, clinical attachment level, and bleeding on probing were scored at baseline, 4 weeks. Gingival index and plaque index were scored at baseline, 2 weeks, and 4 weeks. The results were as follows: 1. In the experimental group, gingival index, plaque index, probing pocket depth, and clinical attachment level showed statistically significant decrease, but in the control group, significant increase(p<0.05). 2. There was no significant difference between the experimental and the control group in bleeding on probing, but significant decrease in the experimental group and Significant increase in the control group In a time-dependent manner(p <0.05). From these results, it can be concluded that regular use of mouthrinses prepared by sterilized water-generating $device(Purister^{(R)})$ as adjunctives of mechanical plaque control, may be effective to prevent and treat gingivitis and incipient periodontitis.
이지현,Lee, Ji-hyun 대한건축사협회 2015 建築士 Vol.2015 No.8
이번호에 소개하는 해외건축동향은 지난 6월호에 이어 여전히 인도, 북쪽 지방의 뉴 델리에 위치해 있는 Indian Habitat Centre이다. Habitat을 번역하면 "서식지" 라는 뜻을 가진 이 곳은 도시개발과 환경관련 업무를 보는 사무실의 개념을 떠나서 인간의 이상적 서식지라는 좀 더 큰 근본적 개념을 가지고 계획된 곳이다.
급성기 허혈성 뇌경색 환자들의 변증 분형과 위험 요인들간의 관련성 연구
이지현,두경희,여서원,심소라,박주영,조승연,정우상,문상관,박정미,고창남,조기호,김영석,배형섭,박성욱,Lee, Ji-Hyun,Doo, Kyeong-Hee,Lu, Hsu-Yuan,Shim, So-Ra,Park, Joo-Young,Cho, Seung-Yeon,Jung, Woo-Sang,Moon, Sang-Kwan,Park, Jung-Mi,Ko, Chang-Nam 대한중풍순환신경학회 2012 대한중풍.순환신경학회지 Vol.13 No.1
Object : The purpose of this study was to evaluate the relationship between pattern identification (PI) and stroke risk factors, such as hypertension, diabetes mellitus, dyslipidemia, stroke history, obesity, abdominal obesity and metabolic syndrome. Methods : 46 patients with acute ischemic stroke were recruited from May 2012 to November, 2012. We analyzed the data of 32 patients, and pattern identification was identified by resident and specialist of Korean medicine. We analized patient's PI and risk factor by Fisher's exact test. Results : We found that Dampness-phlegm group was more related with patient's metabolic syndrome than non Dampness-Phlegm group. And Yin deficiency group had less relationship with patient's metabolic syndrome, obesity, abdominal obesity and dyslipidemia than non Yin deficiency group. Conclusions : According to the analysis, these results provide evidence for relationship between the Dampness-phlegm group, Yin deficiency and metabolic syndrome.