• Journal of Microbiology and Biotechnology
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• 제19권11호
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• pp.1342-1347
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• 2009

We have isolated endophytic fungi from the Indian yew tree, Taxus baccata, and then screened for taxol production. Out of the 40 fungal cultures screened, one fungus Gliocladium sp. was found to produce taxol and 10-DABIII (10-deacetyl baccatin III). These compounds were purified by TLC and HPLC and characterized using UV-spectroscopy, ESI-MS, MS/MS, and proton NMR. One liter of Gliocladium sp. culture yielded $10\;{\mu}g$ of taxol and $65\;{\mu}g$ of 10-DABIII. The purified taxol from the fungus showed cytotoxicity towards cancer lines HL-60 (leukemia), A431 (epidermal carcinoma), and MCF-7 (breast cancer).

• 산업식품공학
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• 제22권4호
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• pp.295-303
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• 2018

Polyphenol profiles, physicochemical properties, antioxidant activities, and inhibitory effect of adipocyte differentiation of Houttuynia cordata fermented with Lactobacillus brevis B84 were evaluated. Six polyphenols were characterized for this plant by using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS), and the results were compared with total phenolic content by a spectrophotometric method. The total amount of the identified polyphenols was lower than that determined by the spectrophotometric method. However, the fermentation process influenced polyphenol composition such as content of vanillic acid and caffeic acid. The phytochemical profiles were evaluated by high-performance liquid chromatography with UV and electrospray ionization mass spectrometry detection ($HPLC-DAD-ESI-MS^n$). Total sugar and reducing sugar contents decreased after fermentation. Antioxidant activities such as DPPH, ABTS, and superoxide anion radical scavenging and reducing power were evaluated to compare the beneficial effect after fermentation. Fermented H. cordata increased the lipolytic effect in 3T3-L1 adipocytes. Overall, the results indicate that the fermentation of H. cordata with L. brevis B84 produces changes of phenolic compounds, antioxidant activity, and lipolytic effect.

• 한국식품과학회지
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• 제38권2호
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• pp.309-312
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• 2006

식용 땅콩 40점(국산 28점, 수입산 12점)과 땅콩버터 30점(국산 12점, 수입산 18점)등 2003년 서울에서 무작위 선정된 총 70점의 국내 시판 중인 땅콩 및 그 가공품을 대상으로 aflatoxin $B_1$의 오염을 조사하였다. 본 곰팡이독소의 분석에는 형광검출 HPLC 방법이 사용되었고, 그 오염의 확인에는 HPLC-MS가 이용되었다. 두 가지 대표 시료들에 2 ppb수준으로 첨가된 aflatoxin $B_1$의 회수율은 모두 80% 이상으로 양호하였다. 또한 사용된 두 분석법 즉, HPLC-FD와 HPLC-MS의 검출한계는 각각 0.8과 0.1 ppb로 나타났다. 총 40점의 땅콩 중 10점(국산 4점, 수입산 6점)에서 aflatoxin $B_1$의 오염이 확인되었고, 국산 및 수입산 땅콩의 평균오염수준은 각각 19와 32 ppb이었다. 한편 aflatoxin $B_1$은 총 5점의 땅콩버터에서 검출되었고, 평균 오염수준이 국산과 수입산 땅콩버터 각각 10과 12 ppb이었다. 수입산 땅콩의 경우 aflatoxin $B_1$의 오염도가 보다 빈번히 나타났고, 특히 그 오염수준은 땅콩버터와는 다른 통계적으로 유의한 차이(p<0.05)를 지적하였다. 본 실험의 결과, 땅콩 및 땅콩버터는 한국인의 aflatoxin $B_1$ 노출에 있어서 주요 기여식품이 아님을 확인할 수 있었다.

• 한국식품과학회지
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• 제41권6호
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• pp.636-643
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• 2009

총 388건의 시료를 분석한 결과, 닭 143건 중 총 12건의 플루오르퀴놀론계 항생제가 검출되었으며 다른 식품군에서는 모두 불검출 되었다. 항생제 별로 보면 엔로플록사신이 12건으로 가장 많았고 시프로플록사신이 5건, 노르플록사신이 1건 순이었다. 검출농도는 엔로플록사신이 0.01-0.73 mg/kg, 시프로플록사신이 0.01-0.03 mg/kg 및 노르플록사신이 0.12 mg/kg이었다.

• Natural Product Sciences
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• 제16권2호
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• pp.116-122
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• 2010

A high-performance liquid chromatography (HPLC) with diode array detector (DAD) and electrospray ionization mass spectrometry (ESI-MS) was established for the simultaneous determination of five representative metabolites of the iridoid and phenolic classes from Rehmannia glutinosa. The optimal chromatographic conditions were obtained on an ODS column (5 mm, $4.6{\times}250\;mm$) with the column temperature at $25^{\circ}C$. The mobile phase was composed of water and acetonitrile using a gradient elution with the flow rate 0.3 mL/min. Detection wavelength was set at 205 nm. All calibration curves showed good linear regression ($r^2$ > 0.997) within test ranges. Limits of detection (LOD) and quantitation (LOQ) values were lower than 0.123 and $0.373\;{\mu}g/mL$, respectively. The developed method provided satisfactory precision and accuracy with overall intra-day and inter-day variations of 0.09 - 0.76% and 0.16 - 1.41%, respectively, and the overall recoveries of 99.03 - 102.67% for all of the compounds analyzed. In addition, effectiveness of diverse extraction methods was compared to each other for the development of standard analytic method. The verified method was successfully applied to the quantitative determination of five representative metabolites in twenty-one commercial Rehmannia glutinosa samples from different markets in Korea and China. The analytical results showed that the contents of the five analytes vary significantly with sources.

• 한국물환경학회지
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• 제32권6호
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• pp.670-699
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• 2016

In this study, 16 antibiotics were selected from among the top 30 veterinary antibiotics sold in South Korea in 2014, as well as from among the pharmaceuticals targeted by EPA method 1694, in order to review analytical methods for the detection of trace levels of antibiotics in environmental samples: surface water, soils, animal origin foods, and manures. LC-MS/MS was heavily used. In the chromatography for the detection of the selected antibiotics, the $C_{18}$ column was mostly used at the temperature of $30{\sim}40^{\circ}C$. Water and methanol/acetonitrile were commonly chosen as a nonpolar and a polar mobile phase, respectively. Gradient elution was applied to separate multiclass antibiotics. Volatile additives, such as formic acid, acetic acid, and ammonium acetate were mixed with the mobile phase to improve the ionization efficiency of analytes and the sensitivity in MS detection. Electrospray ionization (ESI) was widely used in the LC-MS/MS and positive ionization was preferred to determine the selected antibiotics. A protonated $[M+H]^+$ molecule was selected as a precursor ion, and its two transitions were analyzed, one for quantitative measurement and the other for confirmation. This study reviewed linearity of the calibration curve, recovery, repeatability, method detection limits (MDLs), and method quantification limits (MQLs) for each target compound used to validate the developed analytical methods.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 추계학술대회
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• pp.303-303
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• 2017

• Mass Spectrometry Letters
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• 제5권1호
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• pp.24-29
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• 2014

An advanced and reliable high performance liquid chromatography (HPLC)/ultraviolet detector (UV)/ion-trap time-of-flight (IT-TOF) mass spectrometry was developed for the simultaneous quantification of 19 marker compounds in Bang-poong-tong-sung-san (BPTS), a traditional oriental prescription. Various parameters affecting HPLC separation and IT-TOF detection were investigated, and optimized conditions were identified. The separation was achieved on a Capcell PAK C18 column ($1.5mm{\times}250mm$, $5{\mu}m$ particle size) using a gradient elution of acetonitrile and water containing 0.1% formic acid at a flow rate of 0.1 mL/min. The column temperature was maintained at $40^{\circ}C$ and the injection volume was $2{\mu}L$. IT-TOF system was equipped with an electrospray ion source (ESI) operating in positive or negative ion mode. The optimized electrospray ionization parameters were as follows: ion spray voltage, +4.5 kV (positive ion mode), or -3.5 kV (negative ion mode); drying gas ($N_2$), 1.5 L/min; heat block temperature, $200^{\circ}C$. Automatic $MS^n$ (n = 1~3) analyses were carried out to obtain structural information of analytes. Elemental compositions and their mass errors were calculated based on their accurate masses obtained from a formula predictor software. The marker compounds in BPTS were identified by comparisons between $MS^n$ spectra from standards and those from extracts. Moreover, the libraries of $MS^2$ and $MS^3$ spectra and accurate masses of parent and fragment ions for marker compounds were constructed. The developed method was successfully applied to the BPTS extracts and identified 17 out of 19 marker compounds in the BPTS extracts.

• Natural Product Sciences
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• 제11권4호
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• pp.248-252
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• 2005

Schisandra chinensis Baill. (Shisandraceae) is used commonly in traditional Korean herbal medicine. One new dibenzocyclooctene lignan compound, benzoylgomisin Q, was found, for the first time, in the fruits of Schisandra chinensis Baill., together with five known lignan compounds; schisandrin, gomisin A, gomisin G, deoxyschisandrin, and gomisin N, using an ESI-positive MS-preparative HPLC auto-purification system. The structures of these compounds were determined via UV, MS, and NMR spectral studies.

• Journal of Microbiology and Biotechnology
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• 제22권8호
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• pp.1059-1065
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• 2012

Biocatalytic transfer of oxygen in isolated cytochrome P450 or whole microbial cells is an elegant and efficient way to achieve selective hydroxylation. Cytochrome P450 CYP105P2 was isolated from Streptomyces peucetius that showed a high degree of amino acid identity with hydroxylases. Previously performed homology modeling, and subsequent docking of the model with flavone, displayed a reasonable docked structure. Therefore, in this study, in a pursuit to hydroxylate the flavone ring, CYP105P2 was co-expressed in a two-vector system with putidaredoxin reductase (camA) and putidaredoxin (camB) from Pseudomonas putida for efficient electron transport. HPLC analysis of the isolated product, together with LC-MS analysis, showed a monohydroxylated flavone, which was further established by subsequent ESI/MS-MS. A successful 10.35% yield was achieved with the whole-cell bioconversion reaction in Escherichia coli. We verified that CYP105P2 is a potential bacterial hydroxylase.