Determination Of Oleanolic Acid Research Articles

Determination of oleanolic acid and ursolic acid in Oldenlandia diffusa and its substitute using high performance liquid chromatography

An improved quality evaluation method for Oldenlandia diffusa (Willd.) Roxb. and its substitute was established by a well-defined high performance liquid chromatographic (HPLC) method. Firstly, a complete separation of oleanolic acid and ursolic acid was successfully achieved by optimizing the mobile phase systems based on previous reports. The extraction method was optimized and the less toxic solvent was selected for extraction. The systematic survey of herbal markets has shown that O. corymbosa (L.) Lam are widely available and used indiscriminately as O. diffusa. Twenty-seven samples of O. diffusa and seventeen samples of O. corymbosa were analyzed. The results showed that the contents of oleanolic acid and ursolic acid in O. diffusa were generally lower by almost two times than those in O. corymbosa. Moreover, the contents of oleanolic acid and ursolic acid between the fresh and dry samples were compared. The introduction of quality evaluation method could be useful for the species identity and quality evaluation of O. diffusa and its substitute.

Extraction of Oleanolic Acid from Clematis mandshurica and Protective Effect of the Acid on Neural Function and Early Brain Injury after Subarachnoid Haemorrhage

This paper aims to design a simple and rapid way to extract and determination of oleanolic acid from Clematis mandshurica Rupr. (C. mandshurica), and to disclose the protective effect of the acid on neural function and early brain injury after subarachnoid haemorrhage. To this end, an orthogonal test was performed to examine the effects of ultrasonic-assisted extraction (UAE) variables (i.e. liquid-material ration, time, temperature and frequency) on the extraction of oleanolic acid from C. mandshurica. Then, the oleanolic acid from C. mandshurica was quantified and analysed by liquid chromatography with photodiode array detection (LC-DAD), and the fraction of oleanolic acid was collected by automatic fraction collector. Finally, the author investigated how oleanolic acid influences the neural function and early brain injury after subarachnoid haemorrhage. Through the analysis, the highest oleanolic acid yield of 0.7192% was obtained with the extraction temperature of 70°C, extraction frequency of 90kHz, extraction time of 10min and liquid-material ratio of 30:1. Meanwhile, significant improvement of neural function was observed in the oleanolic acid group of 20mg/kg, and the model group suffered from much more serious neural function injuries than the sham-operated group. This means the oleanolic acid group of 20mg/kg can effectively reduce the cerebral vascular permeability caused by subarachnoid haemorrhage. This research reveals the protective mechanism of oleanolic acid on protection against early brain injury after subarachnoid haemorrhage in rats.

Determination of oleanolic acid in human plasma and its association with olive oil intake in healthy Spanish adults within the EPIC Spain cohort study.

Oleanolic acid (OA) is an important triterpenic compound found in olive oil, however little is known about its concentrations in human plasma. We aimed to determine plasma OA levels in a healthy Spanish population and compare them with estimates of dietary olive oil intake. The final study sample included 141 individuals randomly selected from the European Prospective Investigation into Cancer and Nutrition Spanish cohort. Dietary olive oil intake was estimated using validated dietary history questionnaires. OA concentrations were determined in plasma (from the participants' stored blood samples) using a HPLC-MS method. Correlation coefficients between OA and olive oil intake were calculated, adjusting for center; sex; age; consumption of olives, apples, grapes, and red wine; and fasting state. The mean OA concentration in olive oil nonconsumers was 0.72 ng/mL (SD 0.82), while in the high olive oil intake group it was 1.32 ng/mL (SD 1.14). The fully adjusted partial Spearman correlations coefficients reached 0.36 (p-value < 0.001) overall, varying minimally by sex and fasting state. This is the first study providing steady-state concentrations of triterpenes in humans. The results show that there was low-to-moderate correlation between OA concentrations and olive oil intake in this population.

Determination of oleanolic acid, ursolic acid, lupeol, and stigmasterol by high-performance thin-layer chromatographic method in Oldenlandia corymbosa Linn.

Oldenlandia corymbosa Linn. (Rubiaceae) is an important herb traditionally used as a febrifuge and liver tonic. In this study, a high-performance thin-layer chromatography (HPTLC) method has been established for the quantification of four bioactive markers, oleanolic acid (OA), ursolic acid (UA), lupeol (LU), and stigmasterol (ST), in the whole plant of O. corymbosa. Separation was achieved on silica gel 60 F254 HPTLC plates using hexane-ethyl acetate-methanol (8.2:1.8:0.5, v/v) for oleanolic acid and ursolic acid; and toluene-methanol (9.4:0.6, v/v) for lupeol and stigmasterol as the mobile phases. The quantitation of the four markers was carried out using the densitometric scanning at 540 nm after derivatization using sulfuric acid reagent. The linear regression analysis data for the calibration plots showed a good linear relationship (r2 = 0.9831–0.9979) in the concentration range of 1200–4200 ng for oleanolic acid, 400–1400 ng for ursolic acid, 100–500 ng for lupeol, and 500–2500 ng per spot for stigm...

Determination of oleanolic acid and ursolic acid in loquat leaf extract by chemical derivatization coupled with liquid chromatography-tandem mass spectrometry

Determination of oleanolic acid and ursolic acid in loquat leaf extract by chemical derivatization coupled with liquid chromatography-tandem mass spectrometry

Determination of oleanolic acid and ursolic acid in Shanzhajing Jiangzhi tablet by HPLC

Objective To establish the quality standard for Shanzhajing Jiangzhi tablet by HPLC. Methods Samples were analyzed on a Agilent Zorbax SB C18 column(250 mm×4.6 mm,5 μm) with methanol and 0.06 mol/L ammonium acetate(85:15)as mobile phase at the flow rate of 0.8 ml/min. The wavelength and column temperature were set at 210 nm and 25 ℃, respectively. Results The calibration curve showed a good linear relationship within the range of 0.124-2.48 μg for oleanolic acid (r=0.999 7) and 0.498-9.96 μg for ursolic acid (r=0.999 8). The average recovery ratio of the oleanolic acid and ursolic acid were 96.9% (RSD=1.26%) and 100.4% (RSD=2.6%), respectively. Conclusion The method was proved to be good at evaluation effectiveness and practicality.

Analysis of two anti-tumor active ingredients in Radix Actinidiae chinensis by dispersive liquid–liquid microextraction coupled to high performance liquid chromatography–mass spectrometry

A very simple and effective method for the extraction and determination of oleanolic acid (OA) and ursolic acid (UA) in Radix Actinidiae chinensis was developed using ultrasound-assisted dispersive liquid–liquid microextraction (UA-DLLME) and high performance liquid chromatography–mass spectrometry (HPLC–MS). Ethanol was used as the solvent to extract OA and UA from Radix Actinidiae chinensis, assisted by ultrasonic waves. When the extraction process was finished, the two target analytes in the extraction solvent were rapidly transferred from the ethanol extract to another extraction solvent (chloroform) with the help of a dispersive solvent (tetrahydrofuran) by using DLLME. A series of extraction parameters were investigated and optimized. Under the most favorable conditions, the limits of detection (LOD, S/N = 3) and enrichment factors were 2.0 ng g−1, 89.4 and 6.0 ng g−1, 84.5 for OA and UA, respectively. The recoveries of the spiked sample solutions at three different concentration levels of 200, 500 and 1000 ng g−1 ranged between 88.2 and 96.6%. The proposed method was the first successfully applied for the extraction and determination of OA and UA in Radix Actinidiae chinensis.

Determination of oleanolic acid and ursolic acid in Chinese medicinal plants using HPLC with PAH polymeric C18

Background:The RP-HPLC resolution of two triterpenic acid isomers was unstable. Objective: To separate the oleanolic acid (OA) and ursolic acid (UA) simply within RP-HPLC.Materials and Methods:The separation ability of five stationary phases was studied with the retention effect of their carbon loads. Also the resolution effects of mobile phase composition and different column temperatures were systematically investigated by using Drylab® (Rheodyne LLC.) after evaluating chromatograms automatically.Results:The best available resolution of two bioactive isomers was achieved (r = 3.4) via using PAH (polycyclic aromatic hydrocarbons) polymeric C18 bonded phase column. The chromatographic system was applied to the quantification in ten Chinese medicinal plants and the validation was carried out and the precision (RSD ≤1.34%), the linearity (r ≥ 0.9998) and the recovery (range from 92.1% to 102.6%) were acceptable.Conclusion:It is clear that the method was simple, rapid and reliable for the quantification of two compounds in new HPLC method within PAH polymeric C18.

Qualitative and quantitative analysis of effective components in Fructus Ligustri Lucidi by near infrared spectroscopy

In an attempt to establish the qualitative and quantitative analysis of Fructus ligustri lucidi, near-infrared spectroscopy (NIRS) was applied. The qualitative model can identify nine alcohol-broiled products from eight different geographical origins and one crude sample with a factorization algorithm and pretreatment of the second-derivative (2-Der). For the quantitative models, a partial least squares (PLS) algorithm with optimum parameters was applied for determination of oleanolic acid (OA) and ursolic acid (UA) in Fructus ligustri lucidi. There is no significant difference for the observed values between the NIRS and HPLC method since the results of the t-tests are 0.590 and 0.441, respectively, both less than t(0.05,19) = 2.093 with a 95% confidence level. The data obtained revealed the proposed NIRS method is viable for the rapid qualitative and quantitative analysis of the active ingredients in Fructus ligustri lucidi.

Utilization of Dispersive Liquid-Liquid Microextraction Coupled with HPLC-UV as a Sensitive and Efficient Method for the Extraction and Determination of Oleanolic Acid and Ursolic Acid in Chinese Medicinal Herbs

Isomeric triterpenic acids of oleanolic acid (OA) and ursolic acid (UA) both have very low ultraviolet absorption and always exist in the same plant, so the separation and simultaneous determination of them have been a difficult task. In this study, a sensitive method combining dispersive liquid-liquid microextraction (DLLME) with HPLC-UV was developed for the extraction and determination of OA and UA in traditional Chinese medicinal herbs (CMHs). Variables influencing DLLME such as type and volume of extraction solvent, volume of dispersive solvent, ionic strength, aqueous phase pH, extraction time, centrifugation speed and time, and sample volume were investigated and optimized. Under the optimum conditions, both OA and UA attained favorable extraction efficiencies with enrichment factors 1378 and 933, respectively. The linear dynamic ranges of 0.07 - 30.4 μg?mL–1 for OA and 0.08 - 33.6 μg?mL–1 for UA were obtained with square correlation coefficients of 0.9963. The detection limits of OA and UA were both 0.02 μg?mL–1. The method recoveries ranged between 88.2% - 116.2% for OA and 85.7% - 108.2% for UA with the RSDs (n = 5) lower than 8.6%. The proposed method was successfully applied to concentrate and simultaneously determine these two triterpenic acids in Hedyotis diffusa and Eriobotrya japonica samples.

Development and validation of an HPTLC method for the analysis of oleanolic acid from the roots ofHelicteres isoraLinn.

A sensitive and reliable high-performance thin-layer chromatographic (HPTLC) method has been developed for the quantitative determination of oleanolic acid in the dried roots of Helicteres isora Linn. Total sapogenins were isolated from the roots, and their alcoholic extract was applied on silica gel G 60 F254 plates with toluene-ethyl acetate-glacial acetic acid, 7:3:0.1 (ν/ν/ν) as mobile phase. Detection and quantification were performed by densitometric scanning at 529 nm. The accuracy of the method was confirmed by conducting recovery studies at three different levels using the standard addition method. The average recovery of oleanolic acid was found to be 98.98%. The proposed HPTLC method provides good resolution of oleanolic acid from other constituents present in sapogenin extract of dried roots of H. isora and can be used for quantification of oleanolic acid present in the extract. The method is simple, accurate, and precise.

Determination of Oleanolic Acid In Ligustrum Lucidum and its Medicinal Preparation by Capillary Electrophoresis

ABSTRACT A simple, rapid, accurate, selective and reproducible capillary electrophoretic method was developed for the assay of oleanolic acid in traditional Chinese herb Ligustrum lucidum and its medicinal preparation. The buffer solution used in this method was 10% acetonitrile and 0.010 M borax solution adjusted to pH 7.50 with 0.10M hydrochloric acid. The Effects of pH value and modifier on the migration behavior of oleanolic acid was investigated and a simulated equation as well as the apparent dissociation constant were obtained. The linear calibration range was 0.040-1.50 mg/ml(r=0.9979). The relative standard deviation of the migration time of oleanolic acid was 0.46% under the optimized conditions. The content of it in Ligustrum lucidum and a kind of Ligustrum lucidum-containing Chinese medicinal preparation was succesfully determined within 4 min.