• Journal of Applied Biological Chemistry
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• 제66권
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• pp.67-72
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• 2023

A simple and accurate method was developed for the quantitative analysis of oleanonic acid (OA) from mastic gum. The analysis was carried out using reverse-phase high-performance liquid chromatography combined with a photodiode array detector (HPLC/PDA). Our optimized method was validated by measuring various parameters, using an INNO C18 column fitted with a gradient elution system. The results revealed limits of detection and quantification of 0.34 and 1.042 ㎍/mL, respectively. The OA calibration curve exhibited excellent linearity over the concentration range of 0.0625 to 2.0 mg/mL, with r² =0.9996. Accuracy tests revealed a high recovery rate of 99.44-103.66%, with precision values below 0.15%. These results suggest that the present analytical method can identify and quantify OA in mastic gum with high precision. The HPLC approach developed in this study might be applied to routine analyses and large-scale extraction procedures for OA content quantification.

• 대한한의학방제학회지
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• 제18권2호
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• pp.251-257
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• 2010

Objectives : To develop and validate High-performance liquid chromatography-photodiode array methods for simultaneous determination of two constituents in Oryeong-san(ORS). Methods : Reverse-phase chromatography using a Gemini C18 column operating at $40^{\circ}C$, and photodiode array(PDA) detection at 280 nm, were used for quantification of the two marker components of ORS. The mobile phase using a gradient flow consisted of two solvent systems. Solvent A was $H_2O$ and solvent B was acetonitrile. Results : Calibration curves were acquired with correlation coefficient ($r^2$)>0.9999, and the relative standard deviation(RSD) values(%) for intra- and inter-day precision were not exceed 1.0%. The recovery rate of each compound was in the range of 93.01-104.16%, with an RSD less than 2.0%. The contents of two compounds in ORS were 1.10-3.72 mg/g. Conclusions : The established HPLC method will be helpful to improve quality control of ORS.

• 한국축산식품학회지
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• 제31권2호
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• pp.191-199
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• 2011

The objective of this study was to develop a method to simultaneously quantify vitamins A and E in infant formula. To determine the vitamin A and E content, vitamin A and four different vitamin E isomers (${\alpha}$-, ${\beta}$-, ${\gamma}$-, and ${\delta}$-tocopherol) were separated by high performance liquid chromatography with a photodiode array detector using a Develosil RPAQUEOUS RP-$C_{30}$ column ($4.6{\times}250$ mm, 5 ${\mu}M$). The vitamin A and E contents in the certified reference material determined using this method were within the certified range of standard values. The limits of detection (LODs) and limits of quantitation (LOQs) for vitamin A were 0.02 and 0.06 ${\mu}g/L$, respectively. LODs and LOQs for the vitamin E isomers ranged from 0.20 to 0.55 and from 0.67 to 1.81 ${\mu}g/L$, respectively. Linear analyses indicated that the square of the correlation coefficient for the vitamin A and E isomers was 0.9997-0.9999. The recovery of vitamins ranged from 96.69 to 97.79%. The results demonstrate that this novel method could be used to reliably analyze vitamin A and E content in infant formula.

• Journal of Applied Biological Chemistry
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• 제66권
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• pp.153-158
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• 2023

Pinus species are native to the Northern Hemisphere and some parts of the tropics to temperate regions in the Southern Hemisphere. They were used as food and medicine in prehistoric times. Massonianoside B is a compound found in pine trees and possesses antioxidant activity. In order to determine the presence and content of this compound in Pinus species, three different parts (needles, branches, and bark) of three Pinus species were extracted and investigated. High-performance liquid chromatography with a gradient elution system along with a reverse-phase INNO column with photodiode array detector was employed. Results showed that the branches of the three Pinus species had higher massonianoside B content (5.502 to 9.751 mg/g DW) than either the needles or bark. Furthermore, among the three species, P. rigida × P. taeda had the highest concentration of total massonianoside B (11.557 mg/g DW). These findings thus provide evidence of biological activity in Pinus species and establish a foundation for further research.

• 한국자원식물학회지
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• 제30권6호
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• pp.693-698
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• 2017

The quality control of natural products is principal key to guarantee the Good Manufacturing Practices (GMP) and Good Clinical Practices (GCP) for the functional food, pharmaceuticals and cosmeceuticals in the industry. In this study, we examined the quantitative analysis of berberine as marker substance of Coptidis Rhizoma by high performance liquid chromatography-photodiode array detector (HPLC-DAD). The HPLC method was validated and met all the requirements for the quality control analysis recommended by FDA and ICH. The berberine was separated on a Xterra $C_{18}$ column ($5{\mu}m$, $4.6{\times}250mm$) using mobile phase consisting of distilled water and acetonitrile with $KH_2PO_4$ (3.4 g) and $Na_2SO_4$ (1.7 g). Calibration curve of berberine has been estimated (y = 42293.47x-41589 with the correlation coefficient 0.9999). The amount of berberine was calculated as 4.25%. And berberastine, palmatine, columbamine, jatrorrhizine, epiberberine, berberine and coptisine in the Coptidis Rhizoma were identified by high performance liquid chromatography - electrospray ionization-mass spectrometer (HPLC-ESI-MS) method.

• 한국식품과학회지
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• 제31권1호
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• pp.30-35
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• 1999

기존의 PC나 TLC에 의한 타르색소의 정성은 많은 시간이 소요되고 회수율이 낮아 혼합색소의 경우 주 색소만이 검출되는 단점이 있고, 많은 표준용액이 동시에 전개되어질 수 없다는 단점이 있어 분 실험에서는 Polyamide와 Photodiode array 검출기가 장착된 HPLC를 이용하여 타르색소의 추출, 정제 및 정량을 여러 각도로 검토하여 정량분석의 최적 조건을 확립하였다. 검출 파장은 각 타르색소마다 고유의 최대흡수부가 있으나 동시분석을 위해서는 254 nm의 파장에서 가장 광범위한 타르색소의 검출이 가능하였으며 적색 계통은 $520{\sim}540\;nm$, 청색이나 녹색계통은 620 nm에서 최소검출한계가 낮음을 알 수 있었다. 따라서 타르색소의 분석에는 photodiode array detector가 장착된 HPLC를 이용함으로써 220 nm에서 800 nm까지의 넓은 영역의 파장에 걸쳐 일시에 분석하므로서 시간 절약과 함께 타르색소 피크마다 3차원 스펙트럼을 제공함으로서 실험의 정확도를 높일 수 있었다. 한편 Polyamide column을 사용하였을 때의 회수율을 측정한 결과 청색 1호가 가장 낮은 94.4%를 보였으며, 전체적으로 100% 부근의 아주 높은 만족할만한 회수율을 얻었다. 타르색소를 사용한 국내산 빙과류, 캔디류, 청량음료류를 시료로 하여 타르색소의 정량을 시도한 결과 허용의 타르색소는 검출되지 않았으며, 주로 적색 계통의 적색 2호와 40호가, 황색계통의 황색 4호, 5호가 많이 사용되고 있음을 알 수 있었고 타르색소의 사용량도 200 ppm을 초과하는 것은 발견되지 않았다. 한편 녹색은 황색 4호에 청색 1호를, 보라색은 적색과 청색을 혼합한 혼합색소를 사용되어지고 있는 것을 알 수 있었다.

• 대한한의학회지
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• 제25권3호
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• pp.45-54
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• 2004

Objectives : This study was aimed to evaluate marker substances in Gami-Honghwa-Tang (KH-19) by high performance liquid chromatography-photodiode array detector (HPLC-DAD). Gami-Honghwa-Tang is composed of nine crude herbs, Rehmanniae Radix Preparata, Angelicae Gigantis Radix, Cnidii Rhizoma, Paeoniae Radix, Corni Fructus, Moutan Cortex Radicis, Lycii Fructus, Carthami Flos and Glycyrrhizae Radix. Methods : The separation was performed on an Aquasil C18 (4.6×250mm) column by gradient elution with 0.05% TFA in H2O - 0.05% TFA in acetonitrile (0 min 100:0, 20 min 90:10, 40 min 70:30, 60 min 50:50, 80 min 0:100, 90 min 100:0) as the mobile phase at a flow-rate of 1.0 ml/min with detection at 190-800nm. Also we examined the contents for bacteria, pesticide residue and harmful heavy metals. Results : HPLC-DAD was employed to determine the quantities and the qualities of several marker substances such as 5­hydroxymethyl-2-furaldehyde (5-HMF), paeonol, loganin, paeoniflorin, glycyrrhizin, and decursin in the KH-19. There were no bacterial contents, pesticide residues, or harmful heavy metals. Conclusions : We suggest these results could be a useful evidence for quality control of KH-19. This method permits fingerprints of selected individual marker substances from herbal prescriptions without derivatization, multiple purification steps, or lengthy separation times.

• Bulletin of the Korean Chemical Society
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• 제32권8호
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• pp.2666-2670
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• 2011

High-performance liquid chromatography (HPLC) and capillary electrophoresis (CE) were used to identify five active components in the modified herbal decoction Bo-Yang-Hwan-O-Tang (mBHT), i.e., amygdalin, decursin, paeoniflorin, salvianolic acid B, and calycosin-7-O-${\beta}$-D-glycoside. These components were identified by comparing their retention times and mass spectra with those of reference compounds. The conditions of both analytical methods were optimized and validated. Sufficient separation of target analytes was achieved using a buffer consisting of 40 mM sodium borate and 60 mM sodium dodecylsulfate (SDS) containing 10% methanol (pH 9.5) at 250 nm for CE analysis and gradient elution with a water-methanol mobile phase and ultraviolet (UV) photodiode array detector (DAD) at 250 nm for HPLC analysis. The mBHT components were determined within 65 min by HPLC and 16 min by CE. All calibration curves showed high linearity (R > 0.999) within the ranges tested. Intra-day and inter-day precision were less than 1.6% and 1.8% for HPLC and 2.5% and 4.8% for CE, respectively. The accuracy of the methods ranged from 98.8% to 102.3% for HPLC and from 95.9% to 108.2% for CE.

• Bulletin of the Korean Chemical Society
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• 제25권5호
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• pp.694-698
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• 2004

A new method for the simultaneous determination of seven transition metal ions in water and food by microcolumn high-performance liquid chromatography has been developed. The lead, cadmium, mercury, nickel, cobalt, silver and tin ions were pre-column derivatized with tetra-(4-aminophenyl)-porphyrin ($T_4$-APP) to form the colored chelates which were then enriched by solid phase extraction with $C_{18}$ cartridge. The enrichment factor of 50 was achieved by eluted the retained chelates from the cartridge with tetrahydrofuran (THF). The chelates were separated on a ZORBAX Stable Bound microcolumn ($2.0{\times}50\;mm,\;1.8\;{\mu}m$)with methanol-tetrahydrofuran (95 : 5, v/v, containing 0.05 mol/L pyrrolidine-acetic acid buffer salt, pH = 10.0) as mobile phase at a flow rate of 0.5 mL/min and detected with a photodiode array detector from 350-600 nm. The seven chelates were separated completely within 2.0 min. The detection limits of lead, cadmium, mercury, nickel, cobalt, silver and tin are 4 ng/L, 3 ng/L, 6 ng/L, 5 ng/L, 5 ng/L, 6 ng/L, 4 ng/L respectively in the original samples. This method was applied to the determination of the seven transition metal in water and food samples with good results.

• Asian-Australasian Journal of Animal Sciences
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• 제32권8호
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• pp.1205-1210
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• 2019

Objective: The inhibitory effects of dietary antioxidants, diallyl disulfide (DADS) and quercetin, in marinade were investigated on the formation of carcinogenic polycyclic aromatic hydrocarbons (EPA priority 16 PAHs) in grilled pork. Methods: The formation of PAHs in grilled sirloin pork with different marinades after charcoal-grilling for 2 min/side were evaluated using high performance liquid chromatography with a photodiode array detector (HPLC-DAD). Results: Compared with the control marinade treatment (without antioxidant), the addition of DADS (500 mg/kg meat sample) in marinade significantly decreased benzo[a]pyrene (BaP) (100%) and heavy PAHs (84%) in charcoal-grilled pork, while the addition of quercetin at the same concentration could reduce 23% and 55% of BaP and heavy PAHs, respectively. Conclusion: The results of this study suggested that the addition of DADS in the marinade could be important in decreasing the levels of PAHs in grilled meat.