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Zhu F, Zhang X, Du BY, Zhu XX, Zhao GF, Sun Y, Yao QQ, Liang HB, Yao JC, Liu Z, Zhang GM, Qin GF. Using UPLC-LTQ-Orbitrap-MS and HPLC-CAD to Identify Impurities in Cycloastragenol, Which Is a Pre-Clinical Candidate for COPD. Molecules 2023; 28:6382. [PMID: 37687212 PMCID: PMC10489802 DOI: 10.3390/molecules28176382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 08/29/2023] [Accepted: 08/29/2023] [Indexed: 09/10/2023] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is a highly prevalent disease that has become the third leading cause of death worldwide. Cycloastragenol (CAG), which is the genuine sapogenin of the main active triterpene saponins in Astragali radix, is a bioavailable pre-clinical candidate for chronic obstructive pulmonary disease (COPD), and it was investigated in our previous study. In order to progress medical research, it was first efficiently produced on a 2.5-kg scale via Smith degradation from astragaloside IV (AS-IV). Simultaneously, since the impurity profiling of a drug is critical for performing CMC documentation in pre-clinical development, a study on impurities was carried out. As these structures do not contain chromophores and possess weak UV absorption characteristics, HPLC-CAD and UPLC-LTQ-Orbitrap-MS were employed to carry out the quality control of the impurities. Then, column chromatography (CC), preparative thin-layer chromatography (PTLC), and crystallization led to the identification of 15 impurities from CAG API. Among these impurities, compounds 1, 4, 9, 10, 14, and 15 were elucidated via spectroscopic analysis, and 2-3, 5-8, and 11-13 were putatively identified. Interestingly, the new compounds 9 and 14 were rare 10, 19-secocycloartane triterpenoids that displayed certain anti-inflammatory activities against LPS-induced lymphocyte cells and CSE-induced MLE-12 cells. Additionally, a plausible structural transformation pathway of the degradation compounds from CAG or AS IV was proposed. The information obtained will provide a material basis to carry out the quality control and clinical safety assurance of API and related prescriptions. Reasonable guidance will also be provided regarding the compounds with weak UV absorption characteristics.
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Affiliation(s)
- Feng Zhu
- State Key Laboratory of Integration and Innovation of Classic Formula and Modern Chinese Medicine, Lunan Pharmaceutical Group Co., Ltd., Linyi 273400, China; (F.Z.); (X.Z.); (B.-Y.D.); (X.-X.Z.); (G.-F.Z.); (Y.S.); (H.-B.L.); (J.-C.Y.); (Z.L.)
| | - Xiao Zhang
- State Key Laboratory of Integration and Innovation of Classic Formula and Modern Chinese Medicine, Lunan Pharmaceutical Group Co., Ltd., Linyi 273400, China; (F.Z.); (X.Z.); (B.-Y.D.); (X.-X.Z.); (G.-F.Z.); (Y.S.); (H.-B.L.); (J.-C.Y.); (Z.L.)
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China
| | - Bing-Yuan Du
- State Key Laboratory of Integration and Innovation of Classic Formula and Modern Chinese Medicine, Lunan Pharmaceutical Group Co., Ltd., Linyi 273400, China; (F.Z.); (X.Z.); (B.-Y.D.); (X.-X.Z.); (G.-F.Z.); (Y.S.); (H.-B.L.); (J.-C.Y.); (Z.L.)
| | - Xiang-Xia Zhu
- State Key Laboratory of Integration and Innovation of Classic Formula and Modern Chinese Medicine, Lunan Pharmaceutical Group Co., Ltd., Linyi 273400, China; (F.Z.); (X.Z.); (B.-Y.D.); (X.-X.Z.); (G.-F.Z.); (Y.S.); (H.-B.L.); (J.-C.Y.); (Z.L.)
| | - Gui-Fang Zhao
- State Key Laboratory of Integration and Innovation of Classic Formula and Modern Chinese Medicine, Lunan Pharmaceutical Group Co., Ltd., Linyi 273400, China; (F.Z.); (X.Z.); (B.-Y.D.); (X.-X.Z.); (G.-F.Z.); (Y.S.); (H.-B.L.); (J.-C.Y.); (Z.L.)
| | - Ying Sun
- State Key Laboratory of Integration and Innovation of Classic Formula and Modern Chinese Medicine, Lunan Pharmaceutical Group Co., Ltd., Linyi 273400, China; (F.Z.); (X.Z.); (B.-Y.D.); (X.-X.Z.); (G.-F.Z.); (Y.S.); (H.-B.L.); (J.-C.Y.); (Z.L.)
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China
| | | | - Hong-Bao Liang
- State Key Laboratory of Integration and Innovation of Classic Formula and Modern Chinese Medicine, Lunan Pharmaceutical Group Co., Ltd., Linyi 273400, China; (F.Z.); (X.Z.); (B.-Y.D.); (X.-X.Z.); (G.-F.Z.); (Y.S.); (H.-B.L.); (J.-C.Y.); (Z.L.)
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China
| | - Jing-Chun Yao
- State Key Laboratory of Integration and Innovation of Classic Formula and Modern Chinese Medicine, Lunan Pharmaceutical Group Co., Ltd., Linyi 273400, China; (F.Z.); (X.Z.); (B.-Y.D.); (X.-X.Z.); (G.-F.Z.); (Y.S.); (H.-B.L.); (J.-C.Y.); (Z.L.)
| | - Zhong Liu
- State Key Laboratory of Integration and Innovation of Classic Formula and Modern Chinese Medicine, Lunan Pharmaceutical Group Co., Ltd., Linyi 273400, China; (F.Z.); (X.Z.); (B.-Y.D.); (X.-X.Z.); (G.-F.Z.); (Y.S.); (H.-B.L.); (J.-C.Y.); (Z.L.)
| | - Gui-Min Zhang
- State Key Laboratory of Integration and Innovation of Classic Formula and Modern Chinese Medicine, Lunan Pharmaceutical Group Co., Ltd., Linyi 273400, China; (F.Z.); (X.Z.); (B.-Y.D.); (X.-X.Z.); (G.-F.Z.); (Y.S.); (H.-B.L.); (J.-C.Y.); (Z.L.)
- College of Pharmacy, Shandong University of Traditional Chinese Medicine, Jinan 250355, China
| | - Guo-Fei Qin
- State Key Laboratory of Integration and Innovation of Classic Formula and Modern Chinese Medicine, Lunan Pharmaceutical Group Co., Ltd., Linyi 273400, China; (F.Z.); (X.Z.); (B.-Y.D.); (X.-X.Z.); (G.-F.Z.); (Y.S.); (H.-B.L.); (J.-C.Y.); (Z.L.)
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Mizukoshi H, Kimura K, Ikemura H, Mori Y, Nagaoka M. Structural determination of the cell wall polysaccharide LCPS-1 in Lacticaseibacillus paracasei strain Shirota YIT 9029. Carbohydr Res 2022; 521:108670. [PMID: 36103733 DOI: 10.1016/j.carres.2022.108670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Revised: 08/29/2022] [Accepted: 08/30/2022] [Indexed: 11/02/2022]
Abstract
The neutral polysaccharides LCPS-1 and LCPS-2 play functional roles in the cell wall of the lactic acid bacterium Lacticaseibacillus paracasei strain Shirota YIT 9029 (LcS; formerly Lactobacillus casei strain Shirota YIT 9029), which has long been used as a probiotic food product. Studies have shown that LCPS-1 is associated with the immunomodulatory functions of LcS. We hypothesized that the structure of LCPS-1 is crucial for elucidating the mechanism of action of LcS on host immune responses and aimed to solve the undetermined primary structure of LCPS-1. Our results showed that LCPS-1 has a molecular weight of >400 kDa and is composed of Glc, Rha, Gal, and GlcNAc, with a repeating structure. Using limited degradation reactions, including controlled Smith and deamination degradations, we obtained key fragments with low molecular weight. Subsequently, their structures were analyzed using NMR spectra and other analytical techniques. Further, we integrated the results for each key fragment to derive the complete structure of LCPS-1. Our results indicated that the most probable structure of LCPS-1 is composed of two types of units (X, Y), each with a basic structure of seven sugars in which the C2-position of Rha is substituted with an acetyl group. The structure of X is {6[Glcβ1-2] Galα1-3[2-OAc] Rhaβ1-4Glcβ1-4[Rhaα1-3] [Glcα1-6] Glcβ1-} and that of Y is {6[Glcβ1-2] Galα1-3[2-OAc] Rhaβ1-4Glcβ1-4[Rhaα1-3] [Glcα1-6)] GlcNAcβ1-}, which can be expressed as (X6Y12)n. In this study, we identified the primary structure of LCPS-1, and our results may enable an improved understanding of the immunomodulatory abilities of LcS.
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Affiliation(s)
- Harumi Mizukoshi
- Yakult Central Institute for Microbiological Research, 5-11 Izumi Kunitachi-shi, Tokyo, 186-8650, Japan.
| | - Kazumasa Kimura
- Yakult Central Institute for Microbiological Research, 5-11 Izumi Kunitachi-shi, Tokyo, 186-8650, Japan
| | - Haruo Ikemura
- Yakult Central Institute for Microbiological Research, 5-11 Izumi Kunitachi-shi, Tokyo, 186-8650, Japan
| | - Yoko Mori
- Yakult Central Institute for Microbiological Research, 5-11 Izumi Kunitachi-shi, Tokyo, 186-8650, Japan
| | - Masato Nagaoka
- Yakult Central Institute for Microbiological Research, 5-11 Izumi Kunitachi-shi, Tokyo, 186-8650, Japan
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Yoshiba K, Saheki T, Christensen BE, Dobashi T. Conformation and cooperative order-disorder transition in aqueous solutions of β-1,3-d-glucan with different degree of branching varied by the Smith degradation. Biopolymers 2019; 110:e23315. [PMID: 31180595 DOI: 10.1002/bip.23315] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Revised: 05/22/2019] [Accepted: 05/23/2019] [Indexed: 11/05/2022]
Abstract
β-1,3-d-glucan with different degrees of branching were obtained by selectively and gradually removing side chains from schizophyllan, a water-soluble triple helical polysaccharide, using the Smith degradation. Size exclusion chromatography combined with a multi-angle light scattering detection was performed in aqueous 0.1 M NaCl. The degree of branching decreased after the Smith degradation, while the molar mass distributions were almost unchanged. The molecular conformation of the Smith-degraded β-1,3-d-glucan was analyzed on the basis of the molar mass dependency of the radius gyration, and found to be comparable to the original triple helix of schizophyllan. Differential scanning calorimetry in deuterium oxide-hexadeuterodimethylsulfoxide mixtures was performed to investigate the effects of the degree of branching on the cooperative order-disorder transition. Removal of side chains affects both the transition temperature and transition enthalpy. The ordered structure is formed by the residual side chains in the triplex unit, so that the linear cooperative system of the triplex is maintained after the Smith degradation.
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Affiliation(s)
- Kazuto Yoshiba
- Division of Molecular Science, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma, Japan
| | - Toshihiko Saheki
- Division of Molecular Science, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma, Japan
| | - Bjørn E Christensen
- NOBIPOL, Department of Biotechnology and Food Science, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
| | - Toshiaki Dobashi
- Division of Molecular Science, Graduate School of Science and Technology, Gunma University, Kiryu, Gunma, Japan
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Sato K, Hara K, Yoshimi Y, Kitazawa K, Ito H, Tsumuraya Y, Kotake T. Yariv reactivity of type II arabinogalactan from larch wood. Carbohydr Res 2018; 467:8-13. [PMID: 30036728 DOI: 10.1016/j.carres.2018.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 07/05/2018] [Accepted: 07/06/2018] [Indexed: 10/28/2022]
Abstract
Larch arabinogalactan (AG) is classified as a plant type II AG. Its basic structure is constituted by a β-1,3-galactan main chain with β-1,6-galactan side chains. But its properties are distinct from other type II AGs. Whereas most type II AGs are found as glycan moieties of arabinogalactan-protein (AGP), larch AG lacks a protein moiety. Larch AG itself is also unlike other type II AGs as it lacks Yariv reactivity, the capability of AG to form insoluble precipitate with β-Yariv reagents, 1,3,5-tri-(p-glycosyloxyphenylazo)-2,4,6-trihydroxybenzene with β-glucosyl or β-galactosyl residues at the termini. For the present study, we prepared β-galactan I, II, and III from larch AG by performing single, double, and triple Smith degradation, which breaks β-1,6-galactan side chains, and examined Yariv reactivity of the products. Methylation analysis revealed that β-galactans II and III had lost more than 90% of their β-1,6-galactan branches. In the radial gel diffusion assay, β-galactans II and III showed Yariv reactivity, indicating the presence of a Yariv-reactive structure in larch AG, although native larch AG does not have Yariv reactivity. The Yariv reactivity of the β-galactans was completely lost after treatment with endo-β-1,3-galactanase. These results confirm that β-1,3-galactan is necessary for Yariv reactivity of type II AG. The present results also suggest that high substitution of β-1,3-galactan with β-1,6-galactan side chains affects Yariv reactivity in larch AG.
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Affiliation(s)
- Kazuki Sato
- Department of Biochemistry and Molecular Biology, Faculty of Science, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama, 338-8570, Japan
| | - Katsuya Hara
- Division of Life Science, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama, 338-8570, Japan
| | - Yoshihisa Yoshimi
- Division of Life Science, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama, 338-8570, Japan
| | - Kiminari Kitazawa
- Division of Life Science, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama, 338-8570, Japan
| | - Haruka Ito
- Department of Biochemistry and Molecular Biology, Faculty of Science, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama, 338-8570, Japan
| | - Yoichi Tsumuraya
- Division of Life Science, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama, 338-8570, Japan
| | - Toshihisa Kotake
- Division of Life Science, Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama, 338-8570, Japan; Institute for Environmental Science and Technology, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama, 338-8570, Japan.
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Sigida EN, Fedonenko YP, Shashkov AS, Arbatsky NP, Zdorovenko EL, Konnova SA, Ignatov VV, Knirel YA. Elucidation of a masked repeating structure of the O-specific polysaccharide of the halotolerant soil bacteria Azospirillum halopraeferens Au4. Beilstein J Org Chem 2016; 12:636-42. [PMID: 27340454 PMCID: PMC4902059 DOI: 10.3762/bjoc.12.62] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Accepted: 03/16/2016] [Indexed: 01/14/2023] Open
Abstract
An O-specific polysaccharide was obtained by mild acid hydrolysis of the lipopolysaccharide isolated by the phenol-water extraction from the halotolerant soil bacteria Azospirillum halopraeferens type strain Au4. The polysaccharide was studied by sugar and methylation analyses, selective cleavages by Smith degradation and solvolysis with trifluoroacetic acid, one- and two-dimensional (1)H and (13)C NMR spectroscopy. The following masked repeating structure of the O-specific polysaccharide was established: →3)-α-L-Rhap2Me-(1→3)-[β-D-Glcp-(1→4)]-α-D-Fucp-(1→2)-β-D-Xylp-(1→, where non-stoichiometric substituents, an O-methyl group (~45%) and a side-chain glucose residue (~65%), are shown in italics.
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Affiliation(s)
- Elena N Sigida
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Prospekt Entuziastov 13, Saratov 410049, Russia
| | - Yuliya P Fedonenko
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Prospekt Entuziastov 13, Saratov 410049, Russia
| | - Alexander S Shashkov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, Moscow 119991, Russia
| | - Nikolay P Arbatsky
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, Moscow 119991, Russia
| | - Evelina L Zdorovenko
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, Moscow 119991, Russia
| | - Svetlana A Konnova
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Prospekt Entuziastov 13, Saratov 410049, Russia
- Chernyshevsky Saratov State University, Ulitsa Astrakhanskaya 83, Saratov 410012, Russia
| | - Vladimir V Ignatov
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Prospekt Entuziastov 13, Saratov 410049, Russia
| | - Yuriy A Knirel
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospekt 47, Moscow 119991, Russia
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Ghosh K, Ray S, Bera K, Ray B. Isolation and structural elements of a water-soluble free radical scavenger from Nyctanthes arbor-tristis leaves. Phytochemistry 2015; 115:20-6. [PMID: 25749618 DOI: 10.1016/j.phytochem.2015.02.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 12/02/2014] [Accepted: 02/05/2015] [Indexed: 05/21/2023]
Abstract
The leaves of Nyctanthes arbor-tristis L. (Oleaceae) are used in Ayurvedic medicine for the management of a range of diseases, but reports on its phytochemicals and pharmacological properties are inadequate. Herein, we report purification of an antioxidative polysaccharide (F2) extracted from its leaves by water. The presence of a highly branched polysaccharide (75 kDa) containing esterified phenolic acids was revealed by chemical, chromatographic and spectroscopic analyses. Particularly, ESMS analysis of per acetylated oligomeric fragments derived by Smith degradation provides important structural information on a spectrum of glycerol tagged oligosaccharides. This polysaccharide showed dose dependent free radical scavenging capacity as evidenced by DPPH and Ferric reducing power assay. This pharmacologically active compound (F2) formed a water soluble complex with bovine serum albumin over pH 4.0-7.4. Accordingly, traditional aqueous extraction method provides a molecular entity that induces a pharmacological effect: this could epitomize a smart approach in phytotherapeutic management.
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Affiliation(s)
- Kanika Ghosh
- Natural Products Laboratory, Department of Chemistry, The University of Burdwan, West Bengal 713 104, India
| | - Sayani Ray
- Natural Products Laboratory, Department of Chemistry, The University of Burdwan, West Bengal 713 104, India
| | - Kaushik Bera
- Natural Products Laboratory, Department of Chemistry, The University of Burdwan, West Bengal 713 104, India
| | - Bimalendu Ray
- Natural Products Laboratory, Department of Chemistry, The University of Burdwan, West Bengal 713 104, India.
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Feng LM, Lin XH, Huang FX, Cao J, Qiao X, Guo DA, Ye M. Smith degradation, an efficient method for the preparation of cycloastragenol from astragaloside IV. Fitoterapia 2014; 95:42-50. [PMID: 24613799 DOI: 10.1016/j.fitote.2014.02.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Revised: 02/21/2014] [Accepted: 02/25/2014] [Indexed: 10/25/2022]
Abstract
Cycloastragenol (CA) is the genuine sapogenin of astragaloside IV (ASI). This study focuses on the preparation of CA from ASI. Five hydrolysis methods were compared including H2SO4 hydrolysis, HCl hydrolysis, two-phase acid hydrolysis, mild acid hydrolysis, and Smith degradation. Seven hydrolysis products were purified, and five of them were identified as new compounds. The results indicated that Smith degradation was the most effective approach to prepare CA. In contrast, mild acid hydrolysis produced CA at a low yield, accompanied with the artificial sapogenin astragenol. The other three acid hydrolysis methods mainly produced astragenol. Furthermore, the reaction conditions for Smith degradation were optimized as follows: ASI was dissolved in 60% MeOH-H2O solution, oxidized with 5 equiv. NaIO4 for 12h, followed by reduction with 3 equiv. NaBH4 for 4h, and finally acidified with 1M H2SO4 at pH2 for 24h. Under the optimal conditions, CA could be prepared from ASI at a yield of 84.4%.
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Affiliation(s)
- Lin-min Feng
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Xiong-hao Lin
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Fei-xia Huang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Jing Cao
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Xue Qiao
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - De-an Guo
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China
| | - Min Ye
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, China.
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Huang X, Zhao Y, Jin X. Structural characterisation of a polysaccharide from radix ranunculus ternati. Iran J Pharm Res 2014; 13:1403-7. [PMID: 25587330 PMCID: PMC4232807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A water soluble polysaccharide, HB-1, with a molecular weight of 23,930, was isolated from radix Ranunculi ternati. by hot water extraction, ethanol precipitation, deproteination,ultrafiltration and gel-filtration column chromatography. Its sugar composition was determined by GLC as Glc, Ara, and Gal in a molar ration of 16.071: 2.722: 1. And the absolute configuration of Glc was identified as D. Smith degradation and methylation reaction showed the proportion of -(1)Glc (A) was about 16%, -(1)Glc(4)- (B) about 62%, (C) about 14%, and -(1)Gal(6)- (D) about 8%. The repetitive unit was likely composed of 3 As, 3 Cs, 13 Bs and 1 D. Together with the average molecular weight, it was predictable that HB-1 consisted of about seven of the repetitive unit. The inhibition activity of HB-1 on human glioma cell line SF188 was also measured, only to find it inactive.
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Affiliation(s)
- Xuefeng Huang
- Zhongshan Hospital, Xiamen University, Xiamen 361000, China.
| | - Yun Zhao
- Medical College of Xiamen University, Xiang’an District, Xiamen 361000, China.,E-mail:
| | - Xin Jin
- Medical College of Xiamen University, Xiang’an District, Xiamen 361000, China.
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