Simultaneous Quantification of Limonin, Two Indolequinazoline Alkaloids, and Four Quinolone Alkaloids in <i>Evodia rutaecarpa</i> (Juss.) Benth by HPLC-DAD Method

Zhang, Pei-ting; Pan, Bi-yan; Liao, Qiong-feng; Yao, Mei-cun; Xu, Xin-jun; Wan, Jin-zhi; Liu, Dan; Xie, Zhi-yong

doi:https://doi.org/10.1155/2013/827361

Journal of Analytical Methods in Chemistry

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Abstract Introduction Experimental Results and Discussion Conclusions Acknowledgments References Copyright Related Articles

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Quality Control of Natural Product Medicine and Nutrient Supplements

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Research Article | Open Access

Volume 2013 | Article ID 827361 | https://doi.org/10.1155/2013/827361

Simultaneous Quantification of Limonin, Two Indolequinazoline Alkaloids, and Four Quinolone Alkaloids in Evodia rutaecarpa (Juss.) Benth by HPLC-DAD Method

Pei-ting Zhang,¹Bi-yan Pan,²Qiong-feng Liao,³Mei-cun Yao,¹Xin-jun Xu,¹Jin-zhi Wan,¹Dan Liu,¹and Zhi-yong Xie¹

Academic Editor: Yu-Ming Fan

Received23 Jan 2013

Accepted16 Apr 2013

Published08 May 2013

Abstract

A simple and efficient HPLC-DAD (225 nm) method was developed and validated for the simultaneous determination of limonin and six key alkaloids (evodiamine, rutaecarpine, 1-methyl-2-undecyl-4(1H)-quinolone, evocarpine, 1-methy-2-[(6Z,9Z)]-6,9-pentadecadienyl-4-(1H)-quinolone, and dihydroevocarpine) in Evodia rutaecarpa (Juss.) Benth, which has been widely used as one of the Traditional Chinese Medicines. The chromatographic separation was carried out on a Hypersil BDS C18 column, and gradient elution was employed with a mobile phase containing acetonitrile and water. Contents of the analytes in 18 batches of samples were analyzed by ultrasonic extraction with ethanol and water mixture (80 : 20, v/v) followed by HPLC analysis. Separation of the seven analytes was achieved within 60 min with good linearity (). The RSD of both the intraday and interday precision was below 1.85%. The accuracy at different concentrations was within the range of 97.91 to 100.49%. Hierarchical clustering analysis was performed to differentiate and classify the samples based on the contents of the seven constituents. This study indicated that the quality control of E. rutaecarpa could be simplified to the measurement of four constituents, and that limonin, 1-methyl-2-undecyl-4(1H)-quinolone, and dihydroevocarpine should also be served as the chemical markers together with evodiamine for the quality control of Evodia rutaecarpa (Juss.) Benth.

1. Introduction

The dried fruit of Evodia rutaecarpa (Juss.) Benth (E. rutaecarpa, Chinese name, Wu-zhu-yu) has been used as one of the Traditional Chinese Medicines (TCM) for more than 2000 years and is officially listed in the Chinese Pharmacopoeia [1]. It has been proven to be effective in the treatment of gastrointestinal disorders, headache, postpartum hemorrhage, amenorrhea, and chill limbs. Up to now, E. rutaecarpa is known to contain a large number of compounds including limonoids, indolequinazoline and quinolone alkaloids, essential oils, carboxylic acids, and flavonoids [2].

Extensive studies have been conducted since the discovery of E. rutaecarpa and many pharmacological activities has been reported for alkaloids. Evodiamine (Evo) and rutaecarpine (Rut), two indolequinazoline alkaloids, are the characteristic chemical constituents and responsible for the beneficial effects on the human health. Several studies have shown that Rut has a variety of intriguing biological properties, such as cardioprotective [3–8], antihypertensive [8–11], antithrombotic [8, 11], antiatherosclerosis [8, 12], anti-inflammatory [8, 13], antiobesity [8, 14], and uterotonic activity [15], by modulating drug metabolizing enzymes and receptors [8, 16–18]. Recent studies demonstrated that Evo had anticancer activity and induction of apoptosis in several types of cancer cells [19–26]. In addition, pharmacological studies indicated that quinolone alkaloids of E. rutaecarpa could inhibit leukotriene biosynthesis in human granulocytes [27] and the nuclear factor of activated T cells [28] and had a highly selective antibacterial activity against Helicobacter pylori [29]. Lee et al. [30] found three quinolone alkaloids as blockers of angiotensin II receptor which modulate blood pressure. Furthermore, it was reported that limonin (Lim) had anti-HIV [31, 32], antinociceptive, and anti-inflammatory effects [33, 34], and it could inhibit P-glycoprotein activity and induce carcinogenesis [35, 36].

Unlike the synthetic drugs, herbal medicines have more complicated compositions. The effectiveness of herbal medicines may be attributed to the overall effect of all the components rather than a single component. Besides, the interactions among different components in different herbs are always a concern. Thus, the quality evaluation of herbal medicine should contain the information of as much bioactive components as possible.

To date, there have already been some preliminary researches about the quantitative analysis of E. rutaecarpa. Analytical techniques such as TLC [37, 38], CE [39], HPLC [40–44], UPLC [45], and LC-MS [46–48] have been applied for the determination of indoloquinazoline and/or quinolone alkaloids in E. rutaecarpa. GC-MS has been used to detect the volatile oils in Evodia species [49]. Meanwhile, Huang et al. found that three species of Fructus Evodiae revealed 20 major common peaks, and the similarities of internal transcribed spacer (ITS) sequences were 97% in E. rutaecarpa, but only Evo and Rut were identified and quantitative analyzed [42]. Zhao et al. developed an HPLC method for the determination of wuchuyuamide-I, quercetin, Lim, Evo, and Rut within 55 min [44]. Although only a little pharmacological effect of quinolone alkaloids has been reported so far, it is possible that these compounds may play a vital role in comprehensive effect of E. rutaecarpa. The determination of quinolone alkaloids may provide additional information for the overall quality control. Zhou et al. [48] developed an LC-ESI-MSⁿ method purposed for the analysis and characterization of indolequinazoline and quinolone alkaloids in the extract of E. rutaecarpa. Though 15 peaks were identified by MS data, the method focused on chromatographic fingerprint study and could not be used to quantitative determination of Lim, Evo, and Rut, the contents of which were defined in Chinese Pharmacopoeia.

However, to the best of our knowledge, there has been no method for simultaneous quantitation of limonin, indolequinazoline, and quinolone alkaloids in Evodia rutaecarpa (Juss.) Benth by HPLC-DAD by now. Since DAD can offer peak purity analysis and absorption spectrum of analyte for qualitative analysis, it is a very useful tool in identifying the different compounds simultaneously. The present study is proposed aiming to develop a simple HPLC-DAD method for the simultaneous determination of limonin, two indolequinazoline alkaloids (Evo and Rut), and four quinolone alkaloids (1-methyl-2-undecyl-4(1H)-quinolone (Q1), evocarpine (Q2), 1-methy-2-[(6Z,9Z)]-6,9-pentadecadienyl-4-(1H)-quinolone (Q3), and dihydroevocarpine (Q4)) in 18 batches of E. rutaecarpa (the chemical structures of them are shown in Figure 1). As a result, the method provides a rapid, simple, and accurate simultaneous quantification of Lim and six alkaloids in E. rutaecarpa, which could provide a more suitable method and significantly improve the quality evaluation of the raw material of E. rutaecarpa.

2. Experimental

2.1. Reagents and Materials

Lim, Evo, and Rut standards were purchased from the National Institute for Food and Drug Control (Beijing, China). 1-methyl-2-undecyl-4(1H)-quinolone (Q1), evocarpine (Q2), 1-methy-2-[(6Z,9Z)]-6,9-pentadecadienyl-4-(1H)-quinolone (Q3), and dihydroevocarpine (Q4) were isolated by high-speed counter-current chromatography (HSCCC). Their structures (shown in Figure 1) were confirmed on the basis of spectral analysis comprising ultraviolet spectrometry (UV), ¹H Nuclear Magnetic Resonance (NMR), ¹³C NMR, and electrospray ionisation tandem mass spectrometry (ESI-MS/MS). The purities calculated by normalization of the peak areas were 94.3%, 95.2%, 96.8%, and 98.3%, respectively. Acetonitrile (ACN) used for HPLC was of chromatographic grade (Tedia Company Inc, Beijing, China), and water used was distilled water. Other reagent solutions were of analytical grade. Eighteen batches of samples collected from different regions and time were investigated and authenticated as E. rutaecarpa (Table 1). Voucher specimens were stored away from light and water in sealed dryer before use in order to avoid moisture and chemical changes.

2.2. Standard Solution Preparation

Lim, Evo, Rut, Q1, Q2, Q3, and Q4 were weighed accurately and dissolved in ACN in a 10 mL volumetric flask to make a stock solution (800, 250, 250, 150, 250, 250, and 150 μg/mL, resp.). Working standard solutions were prepared from the stock solution by further dilution with the appropriate volume of methanol. These solutions were stored protected from light at −20°C.

2.3. Sample Solution Preparation

Pulverized sample (120 mesh, 0.5 g) was weighed accurately into a 100 mL conical flask with cover and dipped in 20 mL of ethanol-water (80 : 20, v/v) for 1 h, and then extracted in an ultrasonic bath (35°C, 40 Hz) for 1 h. The extracts were then filtrated through a 0.22 μm membrane filter and diluted with ethanol-water (80 : 20, v/v) to 20 mL for analysis. Each sample was prepared with the previous protocol for HPLC analysis.

2.4. Instrumentation and Chromatographic Conditions

A Waters HPLC instrument equipped with a 1525 QuatPump, a 2996 UV-Vis photodiode array detector, a 717 autosampler, and an Empower workstation was used. Chromatographic separations were carried out on an Hypersil BDS C18 column (200 mm × 4.6 mm, id 5 μm) protected by a guard column (4.0 mm × 3.0 mm, id 5 μm). The mobile phase consisted of water (A) and ACN (B). The gradient program was as follow: 0–30 min, linear gradient 40–50% B; 30–35 min, linear gradient 50–75% B; 35–55 min, linear gradient 75–80% B; 55–60 min, isocratic 80% B. The column temperature was maintained at 25°C. The flow rate of the mobile phase was 1.0 mL/min. The effluents were monitored at 225 nm by a photodiode array detector. A typical injection volume was 20 μL.

2.5. Hierarchical Clustering Analysis (HCA) of 18 Samples Based on Chemical Markers

HCA is a statistical method for finding relatively homogeneous clusters of cases based on measured characteristics. It starts with each case in a separate cluster and then combines the clusters sequentially, reducing the number of clusters at each step until only one cluster is left. When there are cases, this involves clustering steps or fusions. This hierarchical clustering process can be represented as a tree or dendrogram, where each step in the clustering process is illustrated by a joint of the tree. HCA method was used in our study to find relatively homogeneous clusters of the 18 batches of E. rutaecarpa based on the contents of the seven markers as the measured characteristics, which was operated in Minitab 15.0 software.

Ward’s method, which is a very efficient method for the analysis of variance between clusters, was applied, and Euclidean distance was selected as a measurement.

3. Results and Discussion

3.1. Selection and Identification of Markers

Alkaloids and limonoids are the major active compounds in E. rutaecarpa. In the present study, the selected markers, which contained one limonoid (Lim), two indolequinazoline alkaloids (Evo and Rut), and four quinolone alkaloids (Q1, Q2, Q3, and Q4), are the main constituents of E. rutaecarpa and have significant pharmacological effect reported before. Peaks of these seven chemical markers were assigned in HPLC by comparing individual peak retention times and UV spectra with those of the standards. Peaks at retention times 10.2, 14.7, 17.7, 43.5, 44.9, 46.8, and 52.8 min were determined to be Lim, Evo, Rut, Q1, Q2, Q3, and Q4, respectively (Figure 2).

(a)

(b)

3.2. Optimization of Chromatographic Conditions

The optimization of the chromatographic conditions was performed by using the solution of sample number 11. To obtain good resolution and peaks sharp, different compositions of mobile phases (ACN-water or methanol-water) and different gradient elution programs were tried. The results showed that sharp and symmetrical peaks were obtained by using ACN as organic phases. Because the analytes had a great difference in polarity, the ratio of organic phases was changed rapidly in 30–35 min. According to the UV spectra of seven markers recorded by DAD full scan in the range from 210 to 400 nm, 225 nm was selected for monitoring the seven markers, which provided the optimum S/N and the highest value of the marker with the lowest content for simultaneously quantitative analysis of all the markers. Compared with [44, 48], the usage of single-wavelength UV detection instead of multiwavelength and MS detection was essential to the popular application of the method.

3.3. Optimization of Extraction Method

The constituents of E. rutaecarpa could be extracted by reflux [41–43], ultrasonic water bath [46–48], and supercritical fluid [45]. To simplify the extraction process, ultrasonic extraction was chosen, and the efficiency of extraction procedure was evaluated by using different solvents, such as methanol, ethanol, ethyl acetate, and chloroform. The best solvent was found to be ethanol-water, which was less poisonous and provided the highest values in the contents of the seven markers.

A method involving four-factor-three-level orthogonal array design (OAD) including composition of extraction solvent (ethanol-water 70 : 30, 80 : 20, and 90 : 10, v/v), volume of extraction solvent (10, 15, and 20 mL), and duration of extraction (30, 45, and 60 min) was developed for the optimization of the extraction. The results demonstrated that the established extraction method without the procedure of concentration was adequate and appropriate for the analysis. Therefore, the sample preparation method was optimized as in “Section 2.3. Sample Solution Preparation.”

3.4. Method Validation

Specificity was investigated by comparing the chromatograms of mixed standards and the extract of E. rutaecarpa (Figure 2). Furthermore, according to the three-dimensional plot of the absorbance as a function of retention time and wavelength in the HPLC-DAD data for sample number 11, no evidence of peak of impurity which overlapped with those of markers was found.

The stock solution containing the seven markers was prepared and diluted to appropriate concentration ranges for the establishment of calibration curves. The calibration graphs were plotted after linear regression of the peak areas versus the corresponding concentrations, and good linear behaviors were observed with the values of higher than 0.999 for all the analytes. LOD and LOQ were determined at S/N of about 3 and 10, respectively (data shown in Table 2).

Precision was evaluated with the solution of sample number 11 under the selected optimal conditions six times in 1 day for intraday variation and twice a day on 3 consecutive days for interday variation. Repeatability was confirmed with six different working solutions prepared from sample number 11 and, one of them was injected into the apparatus in 0, 2, 4, 8, 12, 24, and 36 h to evaluate the stability of the solution. All the results were expressed as RSDs which were shown in Table 3.

The recovery was performed by adding known amounts of the seven standards at low (80% of the known amounts), medium (same as the known amounts), and high (120% of the known amounts) levels. The spiked samples were then extracted, processed, and quantified in accordance with the methods mentioned above. The recoveries measured at three levels varied from 97.91 to 100.49% with RSDs from 0.13 to 1.94% (data shown in Table 4).

The comparison with those previous study [42, 46, 48] demonstrates that our proposed method has many advantages. It is the first time that limonin, two indolequinazoline alkaloids, and four quinolone alkaloids were analyzed simultaneously with acceptable performance of linearity, precision, repeatability, and accuracy. In addition, the developed method can offer better precision (RSDs < 1.9%) compared with HPLC-MS method [46] (RSDs < 6.6%), so that it can be an economic alternative for experiments in which a higher degree of sensitivity is not required.

3.5. Quantitative Determination of Seven Markers

The contents of seven markers in 18 batches of E. rutaecarpa were measured with the developed method. The representative HPLC chromatograms of mixed standards and the extract of E. rutaecarpa (sample number 11) are shown in Figure 2. The contents of seven markers were calculated from the regression equations obtained from calibration curves, and the results are shown in Table 1, expressed as the percentage of each constituent in crude drug. Among these markers, it was defined in the newest Chinese Pharmacopoeia that the total content of Evo and Rut in E. rutaecarpa should not be less than 0.15%, and the content of Lim should not be less than 1.0%, otherwise it would not be used as the raw material and is regarded as substandard herb. Based on this definition, all samples met the requirement of Chinese Pharmacopoeia and could be put into production, but the content of each marker differed greatly, which might cause serious waste of the herbs.

Moreover, eight samples were stored for several years at a dry and good ventilation place under ambient temperature in order to evaluate storage stability. The results showed that the similarities within samples from the same location were high. It proved that the raw materials could be stored steadily for three years in the previous conditions.

3.6. HCA of 18 Samples Based on 7 Chemical Markers

A dendrogram of HCA was generated (Figure 3), which revealed the relationships among the samples. Using this method, 18 samples were classified into two broad categories. Samples numbers 8 and 17 were in category I, and the other samples were in category II, which was further divided into two clusters. Samples numbers 1, 3, and 5 were in cluster A, and the others were in cluster B. The result indicated that samples with similar chemical profiles could be divided into one group.

The results obtained from the HCA statistical methods accorded well with those of Zhao et al. [44], because we also found that some samples could be classified to the main domain. Generally speaking, 18 samples could be classified into three groups. Samples numbers 8 and 17 were in Group I, which had high contents of seven markers; samples numbers 1, 3, and 5 were in Group II, which had high relative content of Q1; and the other samples were in Group III. The similarities of the herbs were relative to their collecting locations, but the relative content of Q1 was significantly high in three samples (samples numbers 1, 3, and 5) originating from Guangxi and Guizhou Provinces. These results indicated that Q1 played a significant role in HCA. The samples from Guizhou Province showed relatively high contents of all markers; however, the differences between samples came from Guizhou, and other provinces were not obvious. In addition, sample number 17 was found to have extraordinary high contents of all markers, and it might due to the degree of drying of the herb.

At the beginning of manufactory, the content of key constituents in TCMs should be determined in order to adjust the ratio of the prescription, so that the quality of medicine could be controlled easily. According to Zhao et al. [44], blending the low-content samples with the high-content ones is a conductive way to save resources and to guide rational herb use. Actually, it is not encouraged to mix different material in industry. Because the content of key constituents may not have the same trends, the result of mixture is hard to control. As a result, further study should be paid on the quality evaluation of E. rutaecarpa.

3.7. HCA of 18 Samples Based on Lim, Evo, Q1, and Q4

The contents of the seven markers were defined as seven variables in the analysis so as to analyze, differentiate, and classify the seven chemical constituents.

A dendrogram was generated (Figure 4), which revealed the relationships among the chemical constituents. It was noticeable that seven variables were divided into two main clusters. Q1 was in cluster I, and the other samples were in cluster II, which was divided into two subgroups again. Lim was in subgroup A, and the others were in subgroup B.

As shown in the results, Q1 and Lim were essential markers in quality control, and Evo, Rut, and Q3 had similar effect, so as Q2 and Q4. The results indicated that there was no need to analyze all markers to evaluate the quality of E. rutaecarpa. Then several combinations were tried. It was found that the HCA result was mostly accordant with that obtained from seven markers, when the contents of Lim, Evo, Q1, and Q4 were chosen as markers to analyze, differentiate, and classify the 18 samples. Samples numbers 8 and 17 were in category I, and the other samples were in category II, which was divided into two clusters again. Samples numbers 1, 3, and 5 were in cluster A, and the others were in cluster B. Compared with the results attained from seven markers (Figure 3), a little difference occurred in cluster A, and the other samples had the same classification. The results indicated that the quality evaluation of E. rutaecarpa could be simplified to the measurement of Lim, Evo, Q1, and Q4, and it will be of great use in reasonable application of E. rutaecarpa.

4. Conclusions

In the present study, the limonoid of Lim, the alkaloids of Evo and Rut, and four quinolone alkaloids in E. rutaecarpa were simultaneously determined by the developed HPLC-DAD method. It was the first time that these seven chemical constituents were analyzed by HPLC simultaneously with acceptable performance of linearity, precision, repeatability, accuracy, and robustness. The method also met the requirements of convenience and time efficiency for evaluating the markers content of large quantities of raw materials. More importantly, the optimized method was successfully applied to analyze 18 batches of E. rutaecarpa. HCA was utilized to differentiate and classify the 18 samples for guiding reasonable herb use and controlling its quality better. Further study showed that the quality control of E. rutaecarpa could be simplified to the measurement of Lim, Evo, Q1, and Q4. It is proposed that the determination of key biomarkers may be useful standards to adopt for the quality control of E. rutaecarpa.

Conflict of Interests

The authors declare that they do not have conflict of interests.

Acknowledgments

Financial support was provided by the National Natural Science Foundation of China (Grant nos. 81173564 and 81274028).

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Copyright © 2013 Pei-ting Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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