|Year : 2016 | Volume
| Issue : 45 | Page : 4-8
An efficient high-performance liquid chromatography combined with electrospray ionization tandem mass spectrometry method to elaborate the changes of components between the raw and processed radix Aconitum kusnezoffii
Beibei Wang1, Jiaojiao Ji1, Shuang Zhao1, Jie Dong1, Peng Tan1, Shengsang Na2, Yonggang Liu1
1 School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing 100102, China
2 Department of Traditional Mongolia Medicine, Inner Mongolia Medical University, Hohehot, China
|Date of Web Publication||10-Feb-2016|
Beijing University of Chinese Medicine, Beijing 100102
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Background: Crude radix Aconitum kusnezoffii (RAK) has great toxicity. Traditional Chinese medicine practice proved that processing may decrease its toxicity. In our previous study, we had established a new method of RAK processing (Paozhi). However, the mechanism is yet not perfect. Objective: To explore the related mechanism of processing through comparing the chemical contents. Materials and Methods: A new processing method of RAK named stoving (Hong Zhi) was used. In particular, RAK was stored at 110°C for 8 h, and then high performance liquid chromatography combined with electrospray ionization tandem mass spectrometry (HPLC-ESI-MS n ) was developed for the detection of the alkaloids of the crude and processed RAK decoction pieces. Results: Thirty components of the crude RAK were discovered, among which, 23 alkaloids were identified. Meanwhile, 23 ingredients were detected in the processed RAK decoction pieces, among which, 20 alkaloids were determined yet. By comparison, eight alkaloids were found in both crude and processed RAK decoction pieces, 15 alkaloids were not found in the crude RAK, however, 10 new constituents yield after processing, which are 10-OH-hypaconine, 10-OH-mesaconine, isomer of bullatine A, 14-benzoyl-10-OH-mesaconine, 14-benzoyl-10-OH-aconine, 14-benzoyl-10-OH-hypaconine, dehydrated aconitine, 14-benzoylaconine, chuanfumine, dehydrated mesaconitine. Conclusion: The present study showed that significant change of alkaloids was detected in RAK before and after processing. Among them, the highly toxic diester alkaloids decreased and the less toxic monoester alkaloids increased. Moreover, the concentration changes significantly. HPLC-ESI-MS n are Efficient to elaborate the mechanism of reduction of toxicity and enhancement efficacy after processing.
Keywords: Alkaloids, electrospray ionization, mass spectrometry, processing (Paozhi), radix Aconitum kusnezoffii
|How to cite this article:|
Wang B, Ji J, Zhao S, Dong J, Tan P, Na S, Liu Y. An efficient high-performance liquid chromatography combined with electrospray ionization tandem mass spectrometry method to elaborate the changes of components between the raw and processed radix Aconitum kusnezoffii. Phcog Mag 2016;12:4-8
|How to cite this URL:|
Wang B, Ji J, Zhao S, Dong J, Tan P, Na S, Liu Y. An efficient high-performance liquid chromatography combined with electrospray ionization tandem mass spectrometry method to elaborate the changes of components between the raw and processed radix Aconitum kusnezoffii. Phcog Mag [serial online] 2016 [cited 2019 Jul 21];12:4-8. Available from: http://www.phcog.com/text.asp?2016/12/45/4/175989
- Stoving is a simple and effective method for the processing of radix Aconitum kusnezoffii.
- In the positive mode, the characteristic fragmentations of Aconitum alkaloids were obtained.
- The highly toxic alkaloids have decreased, and the new constituents appeared, which has explained successfully the processing mechanism of radix Aconitum kusnezoffii in chemistry.
| Introduction|| |
Radix Aconitum kusnezoffii (RAK), a commonly used Traditional Chinese Medicine (TCM), termed as Caowu, originated from the dried root of Aconitum kusnezoffii Reichb. (Family Ranunculaceae).  With the efficiency of dispelling wind and dampness, warming the channels and relieving pain, RAK was found to possess many biological activities, such as, the treatment of wind cold damp impediment symptom, joint pain, abdominal pain with cold sensation, and anesthesia pain. ,,,, Whereas, the crude is with strong toxicity and can generally be used externally. , Chemical compositions of the plant contain C-19 (C-18)-diterpenoidalkaloids, lycoctonine-type and aconitine-type alkaloids, as well as a small amount of volatile oil, polysaccharides, heavy metals, proteins and other ingredients. ,,,,,,,,,,,,,, Mainly, diester-type alkaloids, including aconitine, hypaconitine, mesaconitine and so on are both the active ingredients and the toxic components, since the therapeutic dose is close to the toxic dose with a small safety range. ,
The processing of Chinese herbal medicine (TCM)  was strictly required and displayed an efficient effect of efficacy enhancing and toxicity reducing in TCM clinical application in China. ,, Until now, there are varieties of herbal processing methods. In summary, these methods can be divided into three types: Dealing with water (immersion, bubbling, wetting with water or other liquid excipients), drying with heat (stoving, to a sting, fumigating), (moistening and frying). ,,,, As for RAK, the traditional processing method is immersion, achieving a phenomenon of tasting with a little benumbing, which aims to accelerate hydrolysis of diester-type alkaloids, thus reducing its toxicity. However, it is worth noting that many alkaloids are lost by water processing and the RAK efficacy decreases. Steaming and boiling, that is, treatment of RAK with thermal pressure steaming after completely moistening, has varieties of advantages, such as high contents of total alkaloids, lower content of toxic diester-type alkaloids, short production cycle and keep similar analgesic effect with the herb. However, they need high-pressure equipment which is not suitable for large-scale production. In our previous study, we compared seven documented processing methods according to the purpose of RAK processing and proved that the most optimal way is to stove, which facilitates toxic diester-type alkaloids hydrolysis under appropriate temperature. It can not only accelerate hydrolysis of aconitine and decrease its toxicity, but also guarantee the amount of total alkaloids. 
To investigate the mechanism of the new processing method of RAK, termed as stoving, the components change of RAK before and after stoving were detected using high-performance liquid chromatography combined with electrospray ionization tandem mass spectrometry (HPLC-ESI-MS n ). This is a sensitive, accurate and rapid technique, which can acquire the mass spectrum information of pure compounds from complex system. ,,, In this paper, a HPLC-ESI-MS n method was applied to lay the foundation for the further study of RAK processing.
| Materials and Methods|| |
The HPLC/MS was recorded on an Agilent 1100 HPLC/MSD Trap XCT/plus mass spectrometer (Wilmington, Germany), which equipped with an ESI source, a diode array detector, a binary pump, an auto-sampler, a column compartment and a Chem Station (Agilent, USA). Samples for detection, benzoylaconine, neoline and fuziline (HPLC-ELSD >98%), were isolated by our lab (School of Chinese Materia Medica, Beijing University of Chinese Medicine). Samples of RAK were collected from (Xinlinhot, China), and were air-dried. All the samples were authenticated by Prof. Shengsang Na. HPLC-grade (MeCN) was purchased from Fisher (USA). Water for HPLC was double distilled and filtrated by 0.45 μm filter membrane.
High-performance liquid chromatography method
Separation of the samples was performed on an Agilent XDB-C 18 (250 mm × 4.6 mm, 5 μm). Solvent A (water/ammonia, 99.6:0.4 v/v), and solvent B (MeCN) were used as mobile phase (gradient eluting), 33% (B) in 0-15 min, 33-50% (B) in 15-45 min, 50-80% (B) in 45-60 min, with the flowing rate of 1.0 ml/min and an column temperature of 30°C. The detection wavelength was 240 nm.
Mass spectrometry method
All experiments were performed on a mass spectrometer equipped with an electro spray source and capable of analyzing ions up to m/z 1000. The ion source temperature was maintained at 350°C. The spray voltage was 40 psi in the positive ion mode. Sheath gas (N 2 ) was infused at 10 L/min. The capillary voltage was fixed at 3000 ev.
Processing of radix Aconitum kusnezoffii
Herbs of RAK were processed, briefly, removing impurity, then placing in a drying oven at an constant temperature (110°C) for 8 h, and took out. The processed sample was reserved in School of Chinese Materia Medica, Beijing University of Chinese Medicine.
Preparation of samples
Preparation of the standards
Benzoylaconine, neoline and fuziline were weighed and fully dissolved with 15 ml methanol to conical flasks, finally, diluted to 50 ng/ml for reserving. The result of mass spectrometer was shown in [Figure 1].
|Figure 1: Mass spectrometer of the benzoylaconine (a), fuziline (b), and neoline (c)|
Click here to view
Preparation of the samples
The 0.5 g air-dried power and 0.5 g processed power of RAK, accurately weighted, were fully dissolved with 25 ml methanol to conical flasks, separately. Weighted, after circumfluence extraction for 30 min, cooled and weighed again, compensating the losing weight with methanol and amply shaking. Supernatant of the samples was filtrated with a 0.45 μm Nylon filter (Iwaki Glass, Tokyo, Japan) into a HPLC amber sample vial for HPLC-MS n analysis. The result of the mass spectrometer was shown in [Figure 2].
|Figure 2: Total ion-chromatogram of the raw and processing radix Aconitum kusnezoffii|
Click here to view
| Results|| |
Establishment of mass spectrometry cracking regulation
A sensitive detector of MS was developed for the detection of benzoylaconine, neoline and fuziline, with the MS 1-4 spectral data shown in [Figure 1]. After further analysis, regulations were represented as follows: Peaks of [M + H] + is prone to appear, easy to lose CH 3 OH, H 2 O, CH 3 COOH, as well as C 6 H 5 COOH, which laid the foundation for rapid identification of alkaloids.
Identification of alkaloids in radix Aconitum kusnezoffii by liquid chromatography-mass spectrometry
In the experiments, 30 alkaloids in RAK were discovered, and 23 compounds were tentatively identified by detailed study of their fragmentation regulations [Table 1]; whereas 23 alkaloids were detected in the processed product, and 20 compounds identified [Table 2], simultaneously. The comparison between the compounds identified from RAK before and after processing on MS 1-4 shows, 15 alkaloids were not observed in the processed part, including sachaconitine, dehydrated deoxyhypaconine, chasmanine, karakolidine, aconitine, neoline, dehydrated hypaconitine, 10-OH-mesaconitine, 10-OH-hypaconitine, dehydrated-3,13-deoxyaconine, mesaconitine, 10-OH-aconitine, 14-acetylneoline, hypaconitine and deoxymesaconitine. However, 10-OH-mesaconitin, 10-OH-hypaconitin, mesaconitine, 10-OH-aconitine, aconitine, hypaconitine, deoxymesaconitine, these seven compounds were diester-type alkaloids with great toxicity and easily hydrolyzed after heating. Ten new compounds were identified in processed RAK, including 10-OH-mesaconine, 14-benzoyl-10-OH-mesaconine, 14-benzoyl-10-OH-hypaconine, 14-benzoyl-10-OH-aconine, 14-benzoylaconine, chuanfumine, isomer of bullatine A, 10-OH-hypaconine, dehydrated mesaconitine and dehydrated aconitine, among which the first five compounds are hydrolyzates of diester-type alkaloids and two compounds dehydrated mesaconitine, dehydrated aconitine, are decomposition products of diester-type alkaloids. The results provide direct evidence that hydrolysis and decomposition reactions of the components with great toxicity occurred in the processing program. By this way, components with little toxicity produce and the toxicity of the herbs decreases.
|Table 1: The MS1-4 data and the identification of alkaloids before processing|
Click here to view
|Table 2: The MS1-4 data and the identification of alkaloids after processing|
Click here to view
| Conclusions and Discussion|| |
According to the references, there are 26 alkaloids from RAK have been reported, which are aconitine, hypaconitine, mesaconitine, deoxyaconitine, beiwutin,  beiwusines A, beiwusine B,  beiwudine,  acsonine,  10-aconifine, benzoylaconine, benzoyl mesaconitine, neoline, 15-α-hydroxyneoline, chasmanine, talatizamine, foresticine, lycoctonine, anthranoyllycoctonine,  lepenine, denudatine,  songorine, 1, 15-dimethoxy-3-hydroxy-14-benzoyl-16-ketoneoline, 8-ethoxyl-14-benzoyl-15-methyoxyaconoine,  songoramine and karakoline.  In our paper, another 16 alkaloids were identified in both crude RAK and the processed product for the first time, includingmesaconine, sachaconitine, 10-OH-aconine, aconine, fuziline, dehydrated deoxyhypaconine, karakolidine, dehydrated aconine, 10-OH-mesaconitine, 10-OH-hypaconitine, dehydrated-3, 13-deoxyaconine, dehydrated deoxyaconine, 10-OH-aconitine, dehydrated hypaconitine, 14-acetylneoline, and deoxymesaconitine.
Chinese medicine processing is the important means to ensure clinical medication safety. In this paper, we demonstrated once again that HPLC-ESI-MS n was rapid and effective to clarify the mechanism of processing from the perspective of the chemical compositions. As far as RAK is concerned, both chemical constituents and content change significantly before and after processing. However, it is necessary to obtain all kinds of standard materials, so that the changes of chemical constituents can be analyzed accurately and quantitatively.
Financial support and sponsorship
This study was supported by National Natural Science Foundation of China (No. 81441135).
Conflicts of interest
There are no conflicts of interest.
| References|| |
National Pharmacopoeia Committee. Pharmacopoeia of the People's Republic of China. Beijing, China: People's Medical Publishing House;2010. p. 220.
Yang YZ, Liu SF. Antihistaminic effects of total alkaloids of Aconitum kusnezoffii
Reichb (author's transl). Zhongguo Yao Li Xue Bao 1980;1:131-3.
Nesterova YV, Povet'yeva TN, Suslov NI, Zyuz'kov GN, Pushkarskii SV, Aksinenko SG, et al
. Analgesic activity of diterpene alkaloids from Aconitum baikalensis
. Bull Exp Biol Med 2014;157:488-91.
Wu G, Huang W, Zhang H, Li Q, Zhou J, Shu H. Inhibitory effects of processed Aconiti tuber on morphine-induced conditioned place preference in rats. J Ethnopharmacol 2011;136:254-9.
Liao WJ, Hu Y, Zhu BR, Zhao XQ, Zeng YF, Zhang DY. Female reproductive success decreases with display size in monkshood, Aconitum kusnezoffii
). Ann Bot 2009;104:1405-12.
Tang L, Ye L, Lv C, Zheng Z, Gong Y, Liu Z. Involvement of CYP3A4/5 and CYP2D6 in the metabolism of aconitine using human liver microsomes and recombinant CYP450 enzymes. Toxicol Lett 2011;202:47-54.
Liu ZM, Niu X, Yang XZ, Niu SD. Percutaneous absorption of aconitine and mesaconitine in extracts of radix Aconitum kusnezoffii
. Zhong Xi Yi Jie He Xue Bao 2006;4:68-72.
Chen SP, Ng SW, Poon WT, Lai CK, Ngan TM, Tse ML, et al.
Aconite poisoning over 5 years: A case series in Hong Kong and lessons towards herbal safety. Drug Saf 2012;35:575-87.
Li ZB, Wang FP. Two new diterpenoid alkaloids, beiwusines A and B, from Aconitum kusnezoffii
. J Asian Nat Prod Res 1998;1:87-92.
Zinurova EG, Khakimova TV, Spirikhin LV, Yunusov MS, Gorovoi PG, Tolstikov GA. A new norditerpenoid alkaloid acsonine from the roots of Aconitum kusnezoffii
Reichb. Russ Chem Bull 2001;50:311-2.
Xu N, Zhao DF, Liang XM, Zhang H, Xiao YS. Identification of diterpenoid alkaloids from the roots of Aconitum kusnezoffii
Reihcb. Molecules 2011;16:3345-50.
Liu J, Li Q, Liu R, Yin Y, Chen X, Bi K. Enrichment and purification of six Aconitum
alkaloids from Aconiti kusnezoffii
radix by macroporous resins and quantification by HPLC-MS. J Chromatogr B Analyt Technol Biomed Life Sci 2014;960:174-81.
Uhrin D, Proksa B, Zhamiansan J. Lepenine and denudatine: New alkaloids from Aconitum kusnezoffii
. Planta Med 1991;57:390-1.
Wang YG, Zhu YL, Zhu RH. Alkaloids of the Chinese drugs, Aconitum
spp. XIII. Alkaloids from Pei Cao Wu, Aconitum kusnezoffii
(author's transl). Yao Xue Xue Bao 1980;15:526-31.
Wang FP, Li ZB, Che CT. Beiwudine, a norditerpenoid alkaloid from Aconitum kusnezoffii
J Nat Prod 1998;61:1555-6.
Xiao PG, Wang FP, Gao F, Liu Y. A pharmacophylogenetic study of Aconitum L. (
Ranunculaceae) from China. Acta Phytotaxonomica Sin 2006;44:1246.
Zhao YY, Dai Y, Cui XM, Miao H. Study on chemical composition of volatile oil of Radix Aconiti kusnezoffii
. Chin Tradit Pat Med 2007;29:588-90.
Sun YJ, Chen Y, Wu JJ, Wang BS, Guo ZR. Studies on the isolation, purification and composition of Aconitum kusnezoffii
polysaccharide. Chin Pharm J 2000;35:731-3.
Gao T, Bi H, Ma S, Lu J. Structure elucidation and antioxidant activity of a novel alpha-(1à3),(1à4)-D-glucan from Aconitum kusnezoffii
Reichb. Int J Biol Macromol 2010;46:85-90.
Zhao YY, Cui XM, Dai Y, Zhang WJ, Gao MJ, Wang CL. Heavy metal contents of the traditional Chinese medicine Radix Aconiti kusnezoffii
. J Chin Med Mater 2005;29:588-90.
Zhao YY, Cui XM, Dai Y, Zhang WB, Feng GQ, Miao H. Contents of heavy metal, BHC and DDT in Radix Aconiti kusnezoffii
Preparata. Chin Tradit Pat Med 2005;27:1165-8.
Xie Y, Jiang ZH, Zhou H, Xu HX, Liu L. Simultaneous determination of six Aconitum
alkaloids in proprietary Chinese medicines by high-performance liquid chromatography. J Chromatogr A 2005;1093:195-203.
Liu W, Pi Z, Wang X, Song F, Liu S. HPLC/ESI-MSn and ESI-MS studies on the Aconitum
alkaloids in three Chinese medicinal herbs. J Sep Sci 2010;33:2898-906.
Peng C, Zheng T, Yang F, Li YX, Zhang DK. Study of neurotoxic effects and underlying mechanisms of aconitine on cerebral cortex neuron cells. Arch Pharm Res 2009;32:1533-43.
Gutser UT, Friese J, Heubach JF, Matthiesen T, Selve N, Wilffert B, et al.
Mode of antinociceptive and toxic action of alkaloids of Aconitum
spec. Naunyn Schmiedebergs Arch Pharmacol 1998;357:39-48.
Singhuber J, Zhu M, Prinz S, Kopp B. Aconitum
in traditional Chinese medicine: A valuable drug or an unpredictable risk? J Ethnopharmacol 2009;126:18-30.
Cai BC, Nie CX, Nan BH, Fu BZ, Yang XW. Research on the processing of preparing Aconitum
Chinese past. Acta Pharm Sin 1990;3:30-2+82.
Liu ZG, Ming ZE, Gong SQ, Ao DB. Introduction of traditional Mongolian processing. J Chin Med Mater 1995;06:294-7.
Zhao Z, Liang Z, Chan K, Lu G, Lee EL, Chen H, et al.
A unique issue in the standardization of Chinese Materia Medica: Processing. Planta Med 2010;76:1975-86.
Yang M, Sun J, Lu Z, Chen G, Guan S, Liu X, et al.
Phytochemical analysis of traditional Chinese medicine using liquid chromatography coupled with mass spectrometry. J Chromatogr A 2009;1216:2045-62.
Li FQ, Wang CL, Li ZY, Xing X, Tu Y. Toxicity of total alkaloids of Aconitum kusnezoffii
Reichb processed with myrobalan on primary cultured myocardial cells of neonatal rats. Chin Tradit Pat Med 2012;05:823-8.
Yang HX, Du YZ, Xiao YC, Li C, Wei LX. Study of processing aconitum with myrobalan. West China J Pharm Sci 2011;06:572-6.
Tu Y, Zhang GJ, Liu ZQ, Wang SM. Study on traditional Mongolian Aconitum kusnezoffii
Reichb with mass spectrometry coupled with electrospray ionization. J Chin Med Mater 2008;02:204-6.
Zou EJ, Bai YF, Jian BY, Jia GH. A preliminary study of the processing of Mongolian Aconitum kusnezoffii
Reichb with artificial urine. J Chin Med Mater 1993;12:22-3.
Liu Y, Tan P, Li F, Qiao Y. Study on the aconitine-type alkaloids of radix Aconiti lateralis
and its processed products using HPLC-ESI-MSn. Drug Test Anal 2013;5:480-4.
Tu Y, Zhang GJ, Liu ZQ, Wang SM. Study on bioactive components of Aconitum kusnezoffii
Reichb. by ESI-MSn. Chin J Tradit Chin Med Pharm 2008;06:531-2.
Chen X, Tan P, He RR, Liu YG. Study on the fragmentation pathway of the aconitine-type alkaloids under electrospray ionization tandem mass spectrometry utilizing quantum chemistry. J Pharm Innov 2013;8:83-9.
Yue H, Pi Z, Song F, Liu Z, Cai Z, Liu S. Studies on the aconitine-type alkaloids in the roots of Aconitum carmichaeli debx
. by HPLC/ESIMS/MS (n). Talanta 2009;77:1800-7.
Ge Y, Mu S, Zhang J, Wang Y, Sun Q, Hao X. Diterpenoid alkaloids from roots of Aconitum
recemulosum and their inhibitory effects on PAF-induced platelet aggregation. Zhongguo Zhong Yao Za Zhi 2009;34:1935-7.
Zhang JM, Wu FE, Chen YZ. Isolation and identification of chasmanine in Aconifum chrysotrichum
. China J Chin Mater Med 1994;19:613-4.
Qi Y, Li SZ, Zhu HB, Song FR, Lin N, Liu ZQ. Chemical constituent changes of wu-tou-tang in compatibility process with Fritillariae cirrhosae
and Fritillariae thunbergii. Chem J Chin Univ 2013;34:1374-8.
Li ZB, Lv GH, Chen DL, Wang FP. Chemical study on the alkaloids of "Caowu". Nat Prod Res Dev 1997;9:9-14.
| Authors|| |
Dr.Yonggang Liu, is an associate professor of School of Traditional Chinese Medicine, Beijing University of Chinese Medicine. His research focus ismaterial basis of Traditional Chinese Medicine and other ethnic medicine.
[Figure 1], [Figure 2]
[Table 1], [Table 2]