Quinclorac, bentazone, 2,4-D, bensulfuron-methyl, dymuron, capropamide, pencycuron 및 ethofenprox를 동시에 분석할 수 있는 전처리 방법과 0.1% 인산 및 아세토니트릴을 이동상으로하고 225 nm를 측정파장으로 사용한 RP-HPLC(reverse phase-high performance liquid chromatography)법을 개발하였다. 동 농약성분들의 검출 및 정량한계는 각각 0.12〜0.84 ppm 및 0.34〜1.20 ppm이었고, 회수율은 78〜96%이었다. 본 방법을 통하여 시료 전처리에서 분석까지 기존 13시간이 소요된 총 분석시간을 3시간 이내로 줄일 수 있었다.

미강에 함유되어 있는 토코페롤 및 토코트리에놀의 함량을 비파괴적으로 신속하게 추정하기 위하여 NIRS(근적외선 분광분석기)를 이용한 분석 방법을 검토하였다. 벼 유전자원 80계통의 미장을 사용하여 HPLC에서 분석된 토코페롤 및 토코트리에놀의 함량치를 NIRS 스펙트럼에 적용시킨 후 검량식을 작성하였다. NIRS의 검량식을 몇가지 방법에 의하여 비교 분석한 결과 2차 미분된 스펙트럼을 MPLS(Modified Partial Least Squares)를 이용한 회귀식에 이용하는 것이 가장 적합하였다. HPLC를 이용한 유전자원들의 성분 함량과 NIRS에서 도출된 검량식과의 상관계수는 토코페롤과 토코트리에놀이 각각 0.992, 0.953을 나타내었다. 이들 검량식은 validation file 에서도 0.846 및 0.956의 높은 상관을 보여 미강 상태에서 토코페롤 및 토코트리에놀의 함량을 NIRS를 이용하여 신속하게 분석할 수 있을 것으로 판단되었다.

The objective of this study was to determine the role of storing years with the variation of total phenol and individual phenolic compounds in soybean (Glycine max L.) seeds. The total phenol content varied from 0.36 to 0.42% over four years, with the highest value (0.42%) found at storage for two and three years. Among the nine soybean varieties examined, Daweonkong had the highest total average phenol content (0.58%). The total content of 11 phenolics varied from 730.0 to 1812.8 ~mu~textrmg~;~textrmg-1 over storage for four years, and the highest concentration (1812.8 ~mu~textrmg~;~textrmg-1 ) was found at storage for two years. Myeongjunamulkong (1465.4 ~mu~textrmg~;~textrmg-1 ) had the highest mean content among the nine soybean varieties. The total content of 11 phenolic compounds measured in this study occupied from 20.96 to 47.73% of the total phenol contents. The highest total phenol contents were in seeds with black coats (5279.4 ~mu~textrmg~;~textrmg-1 ), while the highest concentration of individual phenolic compounds were in seeds with green coats (1419.5 ~mu~textrmg~;~textrmg-1 ). Our study suggests that it may be feasible to improve soybean varieties with high functional substances such as phenolic compounds.

Compositae plants are known to contain biologically active substances that are allelopathic to agricultural crops as well as weed species. Aqueous extracts from leaves of Xanthium occidentale were assayed against alfalfa (Medicago sativa) to determine their allelopathic effects, and the result showed that the extracts applied onto filter paper significantly inhibited seed germination as well as root growth of alfalfa. Untreated seeds germinated in 60h, but extract concentrations greater than 30g ~textrmL-1 delayed seed germination. The extracts significantly inhibited seed germination of alfalfa, and β -amylase activity of alfalfa and barley seeds during 24-36 hours after treatment. Aqueous extracts of 40 g ~textrmL-1 from X. occidentale were completely inhibited the hypocotyl and root growth of alfalfa. Aqueous leaf extracts showed the highest inhibitory effect and followed by root and stem extracts. Early seedling growth of both alfalfa and barnyard grass (Echinochloa crus-galli) was significantly reduced by methanol extracts. By means of high-performance liquid chromatography, chlorogenic acid and trans-cinnamic acid were quantified as the highest amounts from water and EtOAc fractions, respectively. BuOH and EtOAc fractions of X. occidentale reduced alfalfa root growth more than did hexane and water fractions. The findings of the bioassays for aqueous or methanol extracts reflected that the inhibitory effect of extract was closely related to the level of responsible allelochemicals found in plant extracts.

Cyanidin 3-glucoside (C3G) content contained in the grains of blackish purple rice varieties, Heugjinjubyeo, Kilimheugmi, Heugnambyeo, Sanghaehy-anghyeolla, and the progenies derived from their crosses was evaluated by HPLC and UV-Vis spectroscopy. C3G content was higher in the range of 10-30% by using UV-Vis method compared to HPLC method. A significant linear relationship was, however, observed between two analytical methods. The correlation coefficient was 0.98. Thus, this results suggested that it would be able to use UV-Vis spectroscopy to determine C3G content which does not demanded precise value like selection.

길경의 부탄올 분획으로부터 지표성분을 분리, 정제하기 위해 SiO2 컬럼크마토그래피를 실시한 결과 1종(화합물 1)의 단일 물질을 순수 분리하였으며 화합물 1의 구조는 1H, 13C NMR 등 분광학적 관측 결과 platycodin D로 확인되었다. Platycodin D의 HPLC 정량법을 검토한 결과, 검출기는 증기화광산란검출기(ELSD)를, 컬럼은 역상컬럼을 사용하여 길경 MeOH 추출액으로부터 효율적인 지표성분 정량이 가능하였다. 추출조건을 재검토한 결과 환류추출보다는 초음파 추출이 더 효율적이었으며 추출용매로는 80% MeOH이 다른 용매조건보다 추출효율이 우수하였다. 건조조건의 검토에서는 platycodin D의 함량이 양건이나 양건과 건조기 혼용건조 보다 건조기 단독 건조시 더 높았으며 특히 60℃ 열풍건조에서 그함량이 0.083%로서 가장 높았다. 묽은 에탄올 엑스 함량도 건조기만을 이용한 열풍건조가 양건과 건조기 열풍건조를 혼용한 방법보다 4% 정도 더 높았다.

지모의 고품질 품종 육성 및 재배법 개선과 유통중인 생약으로서의 안전성을 위한 품질 평가 기준을 설정하기 위해 지모의 지표성분의 HPLC 분석법을 확립하고자 하였다. 먼저 지모의 유효성분을 분리하고 지표성분화 한 후 HPLC 분석 정량법을 검토하므로써 지모의 품질 분석법을 구명한 결과는 다음과 같다. 지모를 MeOH로 대량 추출하여 계통 추출법으로 용매분배 후 조사포닌 분획인 n-BuOH ext.를 얻었으며 이 n-BuOH ext. 을 silica gel 컬럼 크로마토그래피를 수행하여 화합물 1를 순수 분리 정제하였다. 화합물 1의 1H, 13C NMR spectra 등을 검토한 결과 화합물 1은 지모의 주요 약효성분인 timosaponin A III로 확인되었다. Timosaponin A III은 지모의 주요 성분이자 혈당 강하작용과 항암활성 등의 주요 약효를 보이는 성분으로 지모의 품질 평가 기준으로서 지모의 지표성분으로 하기에 적합하였다. Timosaponin A III의 HPLC 분석법 확립을 위해 ELSD 검출기 가 사용되었으며 ODS계 컬럼을 사용하고 60% acetonitrile를 이동상으로 하여 0.9ml/min의 유속으로 분석을 한 것이 가장 적절한 timosaponin AIII의 HPLC 분석 조건이었다. Timosaponin AIII의 HPLC 분석을 위한 지모 시료의 추출조건 검토에서는 1g 분말시료를 80% MeOH를 추출용매로 할 때 80℃에서 총 2회 환류 추출하는 것이 성분의 총 회수율을 가장 높이는 추출조건이었다.

New HPLC method was developed for determination of some flavonoids such as naringin, hesperidin, neohesperidin, rutin, quercitrin, naringenin, hesperetin and apigenin and their contents in citrus juice and citrus peel from citrus varieties Brown in Cheju. Detection was at 280nm and reverse phase -Bondapak C-18 column was used. Water/methanol/acetic acid as the mobile phase was better than water/acetonitrile/acetic acid. Flavonoids were more stable in 20% n,n-dimethylformamide in methanol(20% DMF) than methanol and pH 12 adjusted by 1N-sodium hydroxide solution. Standard flavonoid solutions were injected three times consecutively and the reproduciability was 0.236 to 3.550%, Correlation coefficient of the calibration curve was 0.9946 to 0.9999. The exiraction efficiency of hesperidin from citrus peel was evaluated with different extraction method such as reflux, ultra-sonicating method, using three solvents (aqueous solutions with pH12 adjusted by 1N-sodium hydroxide, methanol and 20% DMF), respectively. The reflux for 4 hour in 20% DMF was the most efficient of the tested methods and solvents, and recovery percentage were 78.0∼130.0%. Flavonoids were determined in citrus juice. Naringin was 68.2mg/100 in Natsudaidai, Hesperidin were 85.6mg/100 in Sankyool and Neohesperidin was 25.3mg/100 in Dangyooja. Flavonoids were determined in citrus peel. Naringin was 110mg/g in Dangyooja, Hesperidin was 242mg/g in Hungjin and Neohesperidin was 87.9mg/g in Dangyooja.