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QuEChERS 방법을 이용한 농산물 중 Demeton-S-methyl 및 대사체의 잔류 분석법 확립
이가영 ( Ga Yeong Lee ),김창조 ( Chang Jo Kim ),노현호 ( Hyun Ho Noh ),문병철 ( Byeng-chul Moon ),김택겸 ( Taek-gyum Kim ),오민석 ( Min-seok Oh ),김이선 ( Leesun Kim ),백수진 ( Sudal-soon Choi ),최달순 ( Danbi Kim ),김단비 한국환경농학회 2020 한국환경농학회 학술대회집 Vol.2020 No.-
이 연구는 농산물 중 demeton-S-metiiyl과 대사체 demeton-O, demeton-S, demeton-S-methyl sulfoxide 및 demeton-S-methyl sulfone의 잔류 분석법을 확립하기 위하여 수행되었다. 시험에 사용한 농산물은 잔류농약 안전성 조사에서 다빈도 검출 작물과 우리나라 국민 식품섭취량 및 식품 분류의 분포도를 고려하여 현미, 배추, 대두, 고추, 사과로 선정하였다. 대표적인 QuEChERS 방법인 AOAC Official Method 2007.01과 EN 15662 method를 변형하여 잔류농약 분석법을 확립하였다. 추출방법을 확립하기 위하여 AOAC 방법(6 g MgSO<sub>4</sub>, 1.5 g NaOAc)과 EN 방법(4 g MgSO<sub>4</sub>, 1 g NaCl, 1 g Na<sub>3</sub>Cit · 2H<sub>2</sub>O, 0.5 g Na<sub>2</sub>HCit · 1.5H<sub>2</sub>O)을 이용하여 추출효율을 측정한 결과 평균 회수율은 70-120% 범위로 두 방법 모두 유효한 회수율을 보였다. 하지만 AOAC 방법으로 추출한 일부 작물에서 중간 정도의 matrix effect를 보여 EN 방법이 보다 효율적인 것으로 판단되었다. 또한 정제 방법은 PSA, GCB 및 C18을 이용한 d-SPE 방법으로 확립하였다. 모용요의 양에 따른 정제 효율을 측정하기 위하여 PSA 25 mg과 50 mg을 이용하여 정제한 후 회수율을 산출하였으며, GCB 의 양에 따른 정제 효율을 측정하기 위하여 GCB 2.5 mg과 7.5 mg을 이용하여 정제하였다. 또한 유지 제거에 탁월한 흡착제인 C18 첨가 여부에 따른 정제 효율을 측정하기 위하여 C18 25 mg을 첨가한 후 정제하여 회수율을 산출한 결과 모든 경우에서 70-120%의 회수율을 보였다. 따라서 농산물 중 demeton-S-methyl 및 대사체의 잔류분석을 위해서 EN 방법으로 추출하는 것이 합리적이며, 정제는 농산물의 색소 함유 정도와 유지 함유 정도를 고려하여 다양한 흡착제를 적용하여 분석이 가능할 것으로 판단되었다.
Hyun Min Ko,Seon Kyung Song,Ga Yeong Jo,Tae Kil Eom,Ju Sung Kim 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.10
Background : Some of invasive plants, which were introduced from foreign countries, have caused problems in Korea. Invasion of these invasive plants in the ecosystem threatens the habitat of endemic species, reducing biodiversity, and causing a disturbance in the ecological system. Hypochaeris radicata L. (Asteraceae), the most invasive plants in Korea, particularly in Jeju Island, invade farmland, and autochthonous forest, establishing monocultures and modifying the ecosystem structure. This invasive species has become a serious environmental problem because they displace the indigenous plant species. This study was conducted to evaluate the antioxidantive effects of ethanolic extracts from different parts (root, stem, seed and leaf) of the invasive exotic species Hypochaeris radicata L. Methods and Results : The aim of present study was to estimate the total phenolic and flavonoid contents and to investigate in vitro antioxidant potential of ethanolic leaf, root, seed, and stem extracts of the Hypochaeris radicata. Antioxidant activity was assessed by using 2,2-diphenyl-1-picryl-hydrazyl (DPPH) assay, reducing power activity, [2,2-azino-bis(3-ethylbenzthiazoline-6-sulphonic acid)] ABTS+ assay and ferrous ion chelating activity. The total phenolic and flavonoid contents were also determined and expressed in gallic acid and quercetin equivalent respectively. The results of the study indicate that the ethanolic extracts of the leaf, root, seed, and stem of H. radicata posses significant scavenging activity against DPPH (21.25% for leaf, 34.98% for root, 60.76% for seed and 45.25% for stem at 250 μg/ml each) and ABTS+ radical scavenging activity (14.85% for leaf, 17.40% for root, 35.91% for seed and 24.70% for stem at 250 μg/ml each), reducing power activity (0.178 absorbance at 300 μg/ml for leaf, 0.211 absorbance at 300 μg/ml for root, 0.447 absorbance at 300 μg/ml for seed, 0.276 absorbance at 300 μg/ml for stem). The free radical scavenging and antioxidant activities may be attributed to the presence of adequate phenolic (gallic acid content is 361.92.98 μg/g in leaf, 356.59μg/g in root, 719.72 μg/g in seed and 512.08 μg/g stem) and flavonoid compounds (219.52 μg/g in leaf, 75.67μg/g in root, 281.39 μg/g in seed and 215.66 μg/g stem). This study revealed that the ethanolic extracts of both leaf, root, seed and stem of H. radicata has demonstrated significant antioxidant activity. Conclusion : In conclusion, the present study has demonstrated that Hypochaeris radicata seed ethanol extracts are rich in phenolics and have a strong antioxidant activity and a radical-scavenging action in all of the tested methods. This suggests that Hypochaeris radicata is a good source of natural antioxidants.
테이핑이 맨몸 하프 스쿼트 세트에 따라 %MVIC에 미치는 영향
이경순(책임저자) ( Kyung Soon Lee ),강영호 ( Gyeong Ho Kang ),김가희 ( Ga Hui Kim ),이재송 ( Jae Song Lee ),이현지 ( Hyeon Ji Lee ),전진영 ( Jin Yeong Jeon ),정은식 ( Eun Sik Jeong ),조성희 ( Seong Hui Jo ),최태근 ( Tae Geun Choi ) 대한신경치료학회 2015 신경치료 Vol.19 No.2
Purpose This study is intended to examine an effect that taping has on %MVIC according to bodyweight half squat set exercise. Methods Participants in this study are composed of 10 male college students. Rectus femoris and erector spinae was measured by using surface electromyography. SPSS(version 20) was used through normalization process for electromyography data collected before ? after taping. And a paired t-test was used for comparison between before and after taping treatment, and one-way repeated measures ANOVA was used for comparison between sets. Statistical significance level was fixed at .05. Results Statistically significant difference was not shown in comparing MVIC befor e·after the treatment of taping applied on the rectus femoris and erector spinae. A statistically significant decrease was shown in muscle strength after taping in comparing %MVIC before·after the treatment of taping applied on the rectus femoris and erector spinae. A statistically significant increase was shown in %MVIC value in comparison between sets before the treatment of taping applied on rectus femoris No statistical difference was shown in %MVIC value according to each set before the treatment of taping applied on erector spinae. No statistical difference was shown in %MVIC value according to each set after the treatment of taping applied on erector spinae. Conclusion In comparison between before and after the treatment of taping applied on rectus femoris in bodyweight half squat, the taping was efficacious, and the efficacy of taping was shown in comparison between bodyweight half squat sets as well. The efficacy of taping was shown in comparison between before and after the treatment of taping applied on erector spinae. However, the efficacy of taping was not shown in comparison between sets. Accordingly, a change in the muscle strength of erector spinae requires experimental design where it is loaded with weight or the number of sets is increased.