Simultaneous analysis of alkaloids from Zanthoxylum nitidum by high performance liquid chromatography–diode array detector–electrospray tandem mass spectrometry

Botany, phytochemistry, pharmacologic activities, traditional applications, pharmacokinetics, quality control and toxicity of Zanthoxyli Radix: An updated review

ETHNOPHARMACOLOGICAL RELEVANCE

Zanthoxyli Radix (ZR), the dry root of Zanthoxylum nitidum (Roxb.) DC (ZN) is known as Liang Mian Zhen in China and has been the preferred Chinese medicine for the treatment of inflammation and cancer disease at home and abroad. ZR has been used as the core ingredient in anti-inflammatory traditional medicines, such as Sanjiuweitai granules and Jinji tablets, etc. AIM OF THE WORK: This review aimed to provide a comprehensive overview of ZR in terms of traditional uses, quality control, botany, phytochemistry, pharmacology, toxicology, and pharmacokinetics. Meanwhile, the anti-inflammatory substances and mechanism of ZR were emphasized, to offer new perspectives and broad scopes for future studies.

MATERIALS AND METHODS

The information was retrieved from Web of Science, Researchgate, Google Scholar, SciFinder, X-MOL, PubMed, China National Knowledge Infrastructure (CNKI), Chinese Masters and Doctoral Dissertations, and Elsevier between 1984 and 2024.

RESULTS

Till now, a total of 184 chemical components have been identified in ZR, including 91 alkaloids, 22 lignans, 4 flavonoids, 19 coumarins, 17 terpenoids, and 31 other types. Pharmacological studies have proved that ZR had a variety of biological activities, such as anti-tumour, antibacterial, antioxidant and other activities, particularly in anti-inflammation. ZR exerts anti-inflammatory disease effects by modulating various signaling pathways, including MAPK, NF-κB, P13/AKT and JAK/STAT. Pharmacokinetic studies have shown that ZR exhibits low absorption rates, broad distribution, and rapid metabolism. Additionally, this review also revealed the shortcomings of current research on ZR and possible future research directions.

CONCLUSION

Extensive literature analysis indicates that ZR and its bioactive constituents possess diverse pharmacological activities, especially anti-inflammation. Moreover, in order to promote the safety and adaptability of ZR in clinical application, it is also strongly recommended that further research should focus on toxicity studies, pharmacokinetic studies of herb-drug interactions, and quality control.

Molecular networking and collision cross section prediction for structural isomer and unknown compound identification in plant metabolomics: a case study applied to Zhanthoxylum heitzii extracts

Mass spectrometry-based plant metabolomics allow large-scale analysis of a wide range of compounds and the discovery of potential new active metabolites with minimal sample preparation. Despite recent tools for molecular networking, many metabolites remain unknown. Our objective is to show the complementarity of collision cross section (CCS) measurements and calculations for metabolite annotation in a real case study. Thus, a systematic and high-throughput investigation of root, bark, branch, and leaf of the Gabonese plant Zhanthoxylum heitzii was performed through ultra-high performance liquid chromatography high-resolution tandem mass spectrometry (UHPLC-QTOF/MS). A feature-based molecular network (FBMN) was employed to study the distribution of metabolites in the organs of the plants and discover potential new components. In total, 143 metabolites belonging to the family of alkaloids, lignans, polyphenols, fatty acids, and amino acids were detected and a semi-quantitative analysis in the different organs was performed. A large proportion of medical plant phytochemicals is often characterized by isomerism and, in the absence of reference compounds, an additional dimension of gas phase separation can result in improvements to both quantitation and compound annotation. The inclusion of ion mobility in the ultra-high performance liquid chromatography mass spectrometry workflow (UHPLC-IMS-MS) has been used to collect experimental CCS values in nitrogen and helium (CCS_N2 and CCS_He) of Zhanthoxylum heitzii features. Due to a lack of reference data, the investigation of predicted collision cross section has enabled comparison with the experimental values, helping in dereplication and isomer identification. Moreover, in combination with mass spectra interpretation, the comparison of experimental and theoretical CCS values allowed annotation of unknown features. The study represents a practical example of the potential of modern mass spectrometry strategies in the identification of medicinal plant phytochemical components.

A Review on Classification and Biological Activities of Alkaloids from the Genus Zanthoxylum Species

Many plants in the genus Zanthoxylum, belonging to the Rutaceae family, are used as folk medicines for the treatment of various diseases, which have gained much attention for their phytochemical and pharmacological activity investigations. Alkaloids are the largest secondary metabolites with structurally diverse types found in this genus and they demonstrate a wide range of biological activities. The aim of this review is to provide a summary on the isolation, classification, and biological properties of alkaloids from Zanthoxylum species, which also will bring more attention to other researchers for further biological study on alkaloids for the new drug development.

Zanthoxylum nitidum (Roxb.) DC: Traditional uses, phytochemistry, pharmacological activities and toxicology

ETHNOPHARMACOLOGICAL RELEVANCE

Zanthoxylum nitidum (Roxb.) DC. (Z. nitidum), which is known in China as Liang-Mian-Zhen, is mainly distributed in southern China and is widely used in traditional Chinese medicine. It is traditionally used for treating stomach ache, toothache, rheumatic arthralgia, traumatic injury and venomous snake bites. Additional medical applications include the treatment of inflammations, various types of cancer, bacterial and viral infections, gastric and oral ulcers and liver damage.

AIM OF THIS REVIEW

This paper aims to offer up-to-date information on the botany, traditional uses, phytochemistry, pharmacology and toxicity of Z. nitidum. This review also discussed the perspectives for possible future research on Z. nitidum.

MATERIALS AND METHODS

A comprehensive review was carried out on studies about Z. nitidum conducted in the past 60 years by using different resources, including Flora of China, Pharmacopoeia of the People's Republic of China and academic databases.

RESULTS

At present, more than 150 chemical constituents have been separated and identified from Z. nitidum, most of which include alkaloids. Biological activities, including anti-inflammation, analgesia, haemostasis, anticancer and antibacterial, were determined via in vitro and in vivo studies. The variations in the efficacy of Z. nitidum can be attributed to the biological activities of its natural products, especially alkaloids. Toxicity studies on Z. nitidum are relatively few, thus requiring further study.

CONCLUSIONS

This article generalises the current research achievements related to Z. nitidum, which is an important medicinal material in China. Some traditional uses of Z. nitidum have been assessed by pharmacological studies. Unresolved problems remain, including molecular mechanisms underlying biological activities, pharmacokinetics, toxicology and therapeutic effect, which are still being studied and explored before Z. nitidum can be integrated into clinical medicine.

Rapid identification and pharmacokinetic studies of multiple active alkaloids in rat plasma through UPLC-Q-TOF-MS and UPLC-MS/MS after the oral administration of Zanthoxylum nitidum extract

Zanthoxylum nitidum (Roxb.) DC. (ZN) belongs to the genus Zanthoxylum of Rutaceae and has various chemical ingredients and pharmacologic effects. Alkaloids are its main active constituents responsible for diverse pharmacologic effects, such as anti-tumor, anti-bacterial, anti-inflammatory, and analgesic activities. The chemical and pharmacological effects of ZN are well reported, but the in vivo pharmacokinetic profiles of its main active alkaloids are poorly investigated. This study aims to elucidate the absorbed constituents and pharmacokinetic behavior of main active ingredients in rat plasma after the oral administration of ZN extract. The absorbed constituents in rat plasma were qualitatively analyzed using ultra-high-performance liquid chromatography with quadrupole time-of-flight mass spectrometry (UPLC-Q-TOF-MS). Ultra-high-performance liquid chromatography with triple quadrupole mass spectrometry (UPLC-MS/MS) method was developed for the simultaneous determination and pharmacokinetic studies of dihydrochelerythrine (DHCHE), nitidine chloride (NIT), chelerythrine (CHE), sanguinarine (SAN), liriodenine (LIR), skimmianine (SKI), γ-fagarine (FAG), and dictamnine (DIC) in rat plasma. Eighteen prototypes and metabolites were identified according to exact mass, characteristic diagnostic fragment ions, and reference standards. The established UPLC-MS/MS quantitative method met the requirements of FDA for biological analysis methods. Method validation showed that this method has good linearity (r ≥ 0.9910), precision (RSD ≤ 18.63 %), accuracy (88.11 %-117.50 %), and stability. The limit of detection (LOD) could reach 1 ng/mL, and the limit of quantitation could reach 2 ng/mL. The plasma drug concentration of benzophenanthridine alkaloids, such as NIT, CHE, and DHCHE, were still low even after dose differences were deducted. For the furan quinoline alkaloids (such as SKI, FAG, and DIC), only SKI showed high plasma drug concentration, although SKI content comprised only approximately 1/6 of benzophenanthridine alkaloids. This study is the first to simultaneously determine the above-mentioned active alkaloids in rat plasma and would contribute to the comprehensive understanding of in vivo pharmacokinetic behavior on active alkaloids in ZN extract.

Enrichment and analysis of quaternary alkaloids from Zanthoxylum simulans using weak cation exchange solid-phase extraction coupled with LC-MS

INTRODUCTION

Quaternary alkaloids (QAs) are the major alkaloids in several traditional Chinese medicines, especially in Zanthoxylum simulans. However, few studies on enrichment of QAs from Z. simulans were conducted due to their high polarity and low content.

OBJECTIVE

To develop a weak cation exchange (WCX) solid-phase extraction (SPE) coupled with liquid chromatography mass spectrometry (LC-MS) method to enrich and identify QAs from Z. simulans. Meanwhile, the qualitative and quantitative analyses of QAs were carried out based on the optimum conditions of the method.

METHODS

Fresh stem bark of Z. simulans was extracted with 70% aqueous methanol and enriched by WCX-SPE. A high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS) with an electrospray ionisation (ESI) source was used for the qualitative and quantitative analyses of QAs.

RESULTS

Significant improvements were observed in resolution and abundance of the peaks with WCX-SPE. The linearity, limit of detection (LOD) and limit of quantification (LOQ) were determined for this analytical method. The linear relationship (A = 338.85C - 187.72, R²  = 0.99) was explored in the range of 0.5 to 312.5 μg/mL for chelerythrine. The LOD and LOQ for chelerythrine standard solutions were 0.0539 μg/mL and 0.1798 μg/mL, respectively. In addition, 22 peaks were detected successfully with WCX-SPE and nine of them are undetectable without the processing of WCX-SPE.

CONCLUSION

A highly selective and efficient method for simultaneous enrichment and identification of QAs from crude extract of Z. simulans was developed for the first time by combining WCX-SPE with LC-MS.

Comparative study on alkaloids and their anti-proliferative activities from three Zanthoxylum species

Background

Alkaloids have been considered as the most promising bioactive ingredients in plant species from the genus Zanthoxylum. This study reports on the compositions and contents of the Zanthoxylum alkaloids (ZAs) from three Zanthoxylum species, and their potential anti-proliferation activities.

Methods

An HPLC-UV/ESI-MS/MS method was established and employed to analyze the alkaloids in different Zanthoxylum extracts. The common and unique peaks and their relative contents were summarized and compared to evaluate the similarity and dissimilarity of the three Zanthoxylum species. Meanwhile, inhibitory activity tests to four carcinoma cell lines, i.e., stomach tumor cells (SGC-7901), cervical tumor cells (Hela), colon tumor cells (HT-29) and Hepatic tumor cells (Hep G2), were carried out in vitro to evaluate the bioactivities of the ZAs.

Results

Seventy peaks were detected in the crude total alkaloid samples, and 58 of them were identified. As a result, 13 common peaks were found in the extracts of all the three Zanthoxylum species, while some unique peaks were also observed in specific species, with 17 peaks in Z. simulans, 15 peaks in Z. ailanthoides and 11 peaks in Z. chalybeum, respectively. The comparison of the composition and relative contents indicated that alkaloids of benzophenanthridine type commonly present in all the three Zanthoxylum species with high relative contents among the others, which are 60.52% in Z. ailanthoides, 30.52% in Z. simulans and 13.84% in Z. chalybeum, respectively. In terms of activity test, Most of the crude alkaloids extracts showed remarkable inhibitory activities against various tumor cells, and the inhibitory rates ranged from 60.71 to 93.63% at a concentration of 200 μg/mL. However, SGC-7901 cells seemed to be more sensitive to the ZAs than the other three cancer cells.

Conclusion

The alkaloid profiles detected in this work revealed significant differences in both structures and contents among Zanthoxylum species. The inhibitory rates for different cancer cells in this study indicated that the potential anti-cancer activity should be attributed to quaternary alkaloids in these three species, which will provide great guidance for further exploring this traditional medicinal resource as new healthcare products.

Isolation and characterization of the alkaloid Nitidine responsible for the traditional use of Phyllanthus muellerianus (Kuntze) Excell stem bark against bacterial infections

Phyllanthus muellerianus (Kuntze) Excell (family Euphorbiaceae) stem bark methanol extract inhibited the growth of Clostridium sporogenes and Streptococcus pyogenes, responsible for gas gangrene and suppurative and non suppurative diseases, respectively. After the HPLC fingerprint acquisition a bioguided fractionation of the defatted methanol extract allowed the isolation of six fractions whose activity was evaluated against the two pathogen bacteria. A further purification of the most active fraction afforded a pure compound responsible for the very interesting inhibitory activity against C. sporogenes and S. pyogenes (MIC 0.91 μM, MIC 3.64 μM). (1)H NMR and MS analytical techniques allowed the identification of the bioactive as Nitidine; this quaternary ammonium alkaloid was observed in the genus Phyllanthus for the first time. A study on Nitidine counter ion, performed using energy dispersive spectroscopy (EDS) coupled with scanning electron microscopy (SEM) was also carried out.

LC-MS/MS determination and pharmacokinetic study of dehydrocorydaline in rat plasma after oral administration of dehydrocorydaline and Corydalis yanhusuo extract

A rapid, sensitive and selective liquid chromatography/tandem mass spectrometry method (LC-MS/MS) was developed and validated for determination of dehydrocorydaline (DHC) in rat plasma using nitidine chloride as an internal standard. The analytes were solid-phase extracted and eluted on a C18 chromatography column using a mobile phase of acetonitrile and water (containing 0.8% formic acid and 10 mM ammonium acetate) (28:72, v/v). Detection was performed using positive ion electrospray ionization in multiple reaction monitoring modes. The assay was linear over the concentration range 0.625-250 ng/mL with a quantification limit of 0.625 ng/mL. The precision was <13.7%, the accuracy >93.1%, and extraction recovery ranged from 92.1% to 107%. The validated method was successfully applied to the pharmacokinetics and excretion study of DHC in rat plasma after oral administration of pure DHC and an effective fraction of Corydalis yanhusuo (EFY). The pharmacokinetic parameters showed that DHC from EFY was absorbed more rapidly and eliminated more slowly than pure DHC. The result suggests that the differences might be due to the presence of P-glycoprotein (P-gp) inhibitors and that other alkaloids co-existing in the EFY may compete with DHC for transportation by P-gp, metabolization by P450, and binding to plasma proteins.

Antinociceptive activity of Rhoifoline A from the ethanol extract of Zanthoxylum nitidum in mice

AIM OF THE STUDY

Antinociceptive activity of Rhoifoline A (RA), a benzophenanthridine alkaloid obtained from the ethanol extract of Zanthoxylum nitidum, was evaluated in mice using chemical and thermal models of nociception.

MATERIALS AND METHODS

RA was evaluated on anti-nociceptive activity in mice using chemical and thermal models of nociception.

RESULTS

RA administered intraperitoneally at doses of 10, 20, 40 and 80 mg/kg exhibited significant inhibitions on chemical nociception induced by intraperitoneal acetic acid and subplantar formalin, and on thermal nociception in the tail-flick test and the hot plate test. RA neither significantly impaired motor coordination in the rotarod test nor did spontaneous locomotion in the open-field test. RA did not enhance the pentobarbital sodium induced sleep time. These results indicated that the observed antinociceptive activity of RA was unrelated to sedation or motor abnormality. Core body temperature measurement showed that RA did not affect temperature during a 2-hour period. Furthermore, RA-induced antinociception in the hot plate test was insensitive to naloxone or glibenclamide but significantly antagonized by L-NAME, methylene blue and nimodipine.

CONCLUSIONS

Therefore, it is reasonable that the analgesic mechanism of RA possibly involved the NO-cGMP signaling pathway and L-type Ca(2+) channels.

Plasma pharmacochemistry based approach to screening potential bioactive components in Huang-Lian-Jie-Du-Tang using high performance liquid chromatography coupled with mass spectrometric detection

ETHNOPHARMACOLOGICAL RELEVANCE

Huang-Lian-Jie-Du-Tang (HLJDT), a classic prescription of traditional Chinese medicine (TCM), has been used in clinical over 1700 years for the treatment of gastrointestinal disorders, cardiovascular diseases and Alzheimer disease. But the active components of HLJDT were ambiguous, which seriously restricted its clinical application.

MATERIALS AND METHODS

The methodology of plasma pharmacochemistry was applied to screen the bioactive components in HLJDT. A reliable LC/MS system was established for detecting the prototype compounds and metabolites in dosed plasma after oral administration of HLJDT. By comparative analysis of the chemical profiles of HLJDT extracts, blank plasma and dosed plasma, potential bioactive compounds in HLJDT may be discovered.

RESULTS

By comparing the retention time, MS and MS/MS spectra with those of reference standard and literature data, 30 components including 22 prototype compounds and 8 metabolites from HLJDT were discovered as potential bioactive components in rat plasma.

CONCLUSIONS

A reliable and effective method was established to screen the potential bioactive components in the formula of HLJDT, which provided useful information for the further study of action mechanism of HLJDT.

Study on the inclusion interaction of cucurbit[n]urils with sanguinarine by spectrofluorimetry and its analytical application

The characteristics of host-guest complexation between cucurbit[n]uril (CB[n], n=5, 6, 7, 8) and sanguinarine (SA) were investigated by spectrofluorimetry. The result showed that CB[n] (n=5, 6, 7, 8) reacted with SA to form an inclusion complex. At the optimum reaction conditions, the rectilinear calibration graphs were obtained in the range from 0.1 to 2800 ng mL(-1) for the investigated drug, with correlation coefficients 0.9998, 0.9997, 0.9999 and 0.9997 and detection limits 0.052, 0.26, 0.03 and 0.058 ng mL(-1) using CB[5], CB[6], CB[7], and CB[8], respectively. The apparent association constants of the complexes were 1.23 x 10(4), 6.73 x 10(3), 4.53 x 10(4) and 1.21 x 10(4) L mol(-1), for the reagents in the same order. The result demonstrated that CB[7] exhibited a higher fluorescence signal than CB[5], CB[6], and CB[8]. The proposed method was successfully applied for the determination of the drug in human urine and serum samples.

Traditional Chinese medicine and separation science

Traditional Chinese medicines (TCMs) are getting more and more popular nowadays in the whole world for improving health condition of human beings as well as preventing and healing diseases. TCM is a multi-component system with components mostly unknown, and only a few compounds are responsible for the pharmaceutical and/or toxic effects. The large numbers of other components in the TCM make the screening and analysis of the bioactive components extremely difficult. So, separation and analysis of the desired chemical components in TCM are very important subjects for modernization research of TCM. Thus, many novel separation techniques with significant advantages over conventional methods were introduced and applied to separation and analysis of the chemical constituents in TCM. This review presents just a brief outline of the applications of different separation methods for the isolation and analysis of TCM constituents.

Simultaneous determination of eight components in Radix Tinosporae by high-performance liquid chromatography coupled with diode array detector and electrospray tandem mass spectrometry

High-performance liquid chromatography (HPLC) coupled with electrospray tandem mass spectrometry (ESI-MS-MS) and diode array detection (DAD) was used to identify and simultaneously determine eight major ingredients in Radix Tinosporae. The assay was performed on a Diamonsil C(18) analytical column with a gradient solvent system of A (water containing 0.2% formic acid, 20mM ammonium acetate) and B (methanol/acetonitrile=1/1, v/v). The 217, 248, 270 and 347 nm, respectively, were chosen as the monitoring wavelengths to determine four structural types of components, say columbin, phytoecdysteroids (including 20-hydroxyecdysone, 2-deoxy-20-hydroxyecdysone 3-O-beta-d-glucopyranoside and 2-deoxy-20-hydroxyecdysone), menisperine and protoberberine alkaloids (including columbamine, jatrorrhizine and palmatine). This method was validated in respect to precision, repeatability and accuracy, and was successfully applied to quantify the eight components in 39 batches of R. Tinosporae for quality control purpose. The results indicated that the proposed method could be readily utilized as a quality control method for traditional Chinese medicine (TCM).

Rapid structural characterization of isomeric benzo[c]phenanthridine alkaloids from the roots of Zanthoxylum nitidium by liquid chromatography combined with electrospray ionization tandem mass spectrometry

The fragmentation mechanism of six alkaloids, namely: dihydronitidine, dihydrochelerythrine, 8-acetonyldihydronitidine, 8-acetonyldrochelerythrine, nitidine and 1,3-bis(8-dihydronitidinyl)acetone, was investigated by electrospray ionization multi-stage tandem mass spectrometry (ESI-MSn). Tandem mass spectrometry experiments indicated that different substitution sites of the methoxyl groups at C-9 and C-10 or at C-10 and C-11 determined the different abundances of the MS2 fragmentation ions using the same collision energy. According to the different abundances of MS2 product ions, positional isomeric benzo[c]phenanthridine alkaloids can be differentiated. Moreover, ten constituents in the crude alkaloidol extract from the roots of Zanthoxylum nitidium were rapidly identified by high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC/MSn), through comparing the retention times and ESI-MSn spectra with the authentic standards. This work demonstrates that not only the characteristic fragments but also the characteristic abundances of the fragment ions can be used for detailed structural characterization.