Article(id=1320166043356615359, tenantId=1146029695717560320, journalId=1260987677001138203, issueId=1320165935235846995, articleNumber=null, orderNo=null, doi=10.13386/j.issn1002-0306.2025050239, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1748188800000, receivedDateStr=2025-05-26, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1792681712235, onlineDateStr=2026-10-22, pubDate=1784044800000, pubDateStr=2026-07-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792681712235, onlineIssueDateStr=2026-10-22, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792681712235, creator=13701087609, updateTime=1792681712235, updator=13701087609, issue=Issue{id=1320165935235846995, tenantId=1146029695717560320, journalId=1260987677001138203, year='2026', volume='47', issue='14', pageStart='1', pageEnd='532', issueExtLink='null', onlineDate='null', pubDate='1784044800000', pubDateStr='2026-07-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792681686457, creator='13701087609', updateTime=1792720591676, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1320329115677344178, tenantId=1146029695717560320, journalId=1260987677001138203, issueId=1320165935235846995, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1320329115681538483, tenantId=1146029695717560320, journalId=1260987677001138203, issueId=1320165935235846995, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=225, endPage=234, ext={EN=ArticleExt(id=1320166043578913472, articleId=1320166043356615359, tenantId=1146029695717560320, journalId=1260987677001138203, language=EN, title=Process Optimization, Structural Characterization, and Immunomodulatory Activity of Ultrasound-assisted Aqueous Two-phase Extraction of Anemarrhena asphodeloides Polysaccharides, columnId=1261343843090313538, journalTitle=Science and Technology of Food Industry, columnName=Processing Technology, runingTitle=null, highlight=null, articleAbstract=

This study aimed to optimize the ultrasound-assisted aqueous two-phase extraction (UATPE) process of Anemarrhena asphodeloides polysaccharide (AAPs), separate and purify the crude AAPs by different column chromatography techniques to obtain a uniform polysaccharide fraction (AAPs-1-SG), and characterize its structure. The effect of AAPs-1-SG on the viability of RAW264.7 cells was determined by the MTT method. The neutral red method was used to evaluate the effect of AAPs-1-SG on the phagocytic activity of RAW264.7 cells, and the effects of AAPs-1-SG on the levels of NO, IL-1β, IL-6 and TNF-α in RAW264.7 cells were investigated. The results showed that the process parameters of UATPE polysaccharide from Anemarrhena asphodeloides were obtained as follows: Ammonium sulfate mass fraction of 24%, ultrasonic power of 400 W, ethanol volume fraction of 45%, and solid-to-liquid ratio of 1:20 g/mL, and the yield of AAPs was 12.17%±0.25%. Ultraviolet spectral scanning revealed that AAPs-1-SG had no proteins or nucleic acids. FT-IR showed that AAPs-1-SG exhibited typical infrared absorption characteristics of polysaccharides and possessed α and β types glycosidic bonds. AAPs-1-SG was mainly composed of Glc, Ara, and Man, and its molecular weight was 11298 Da. Scanning electron microscopy and atomic force microscopy observed that AAPs-1-SG presented irregular sheet-like and porous structures. In addition, AAPs-1-SG could markedly increase the viability and phagocytic activity of RAW264.7 cells, and significantly improve the levels of NO, IL-1β, IL-6, and TNF-α (P<0.05), further revealing that AAPs-1-SG had better immunomodulatory activity. The findings can provide an important method for the efficient extraction of natural polysaccharides and also offer significant references for the development and utilization of AAPs.

, authors=Lifang LOU1, Jin LI1, Yaolei ZHANG1, 2, authorsList=Lifang LOU, Jin LI, Yaolei ZHANG, authorCompany=null, correspAuthors=null, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright © 2026 Science and Technology of Food Industry. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1320166046942745293, articleId=1320166043356615359, tenantId=1146029695717560320, journalId=1260987677001138203, language=CN, title=超声辅助双水相提取知母多糖工艺优化、结构表征及其免疫调节活性分析, columnId=1261343845481066826, journalTitle=食品工业科技, columnName=工艺技术, runingTitle=null, highlight=null, articleAbstract=

本研究旨在优化超声辅助双水相提取知母多糖(Anemarrhena asphodeloides polysaccharide,AAPs)工艺,并采用不同柱色谱技术分离纯化知母粗多糖,获得均一多糖馏分(AAPs-1-SG),并对其结构进行表征。在此基础上,通过MTT法测定AAPs-1-SG对RAW264.7细胞活力的影响;利用中性红法评价AAPs-1-SG对RAW264.7细胞的吞噬活性的影响。探究AAPs-1-SG对RAW264.7细胞中NO、IL-1β、IL-6和TNF-α水平的影响。结果表明,超声辅助双水相提取AAPs工艺参数为:硫酸铵质量分数24%、超声功率400 W、乙醇体积分数45%和料液比1:20 g/mL,AAPs得率为12.17%±0.25%。紫外光谱扫描发现AAPs-1-SG不含蛋白和核酸;红外光谱发现AAPs-1-SG具有典型的多糖红外吸收特性,具有α型和β型糖苷键;AAPs-1-SG主要由Glc、Ara和Man组成,其分子量为11298 Da;AAPs-1-SG经扫描电镜和原子力显微镜观察发现AAPs-1-SG呈不规则片状和孔状结构。此外,AAPs-1-SG可显著增加RAW264.7细胞活力、吞噬活性及提高NO、IL-1β、IL-6和TNF-α水平(P<0.05),进一步揭示AAPs-1-SG具有较好的免疫调节活性。研究结果为天然多糖高效提取提供重要的方式,也为知母多糖开发和利用提供重要参考。

, authors=娄丽芳1, 李晋1, 张耀磊1, 2, authorsList=娄丽芳, 李晋, 张耀磊, authorCompany=null, correspAuthors=null, authorNote=

娄丽芳(1987−),女,硕士,讲师,研究方向:代谢生理与代谢性疾病的机制,E-mail:

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注:A:硫酸铵质量分数;B:乙醇体积分数;C:超声功率;D:料液比;不同字母表示具有显著性差异P<0.05,图5、图6同。

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注:A:粗AAPs经DEAE-52纯化;B:AAPs-1经Sephadex-G100纯化。

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注:A:分子量;B:单糖组成;C:UV光谱;D:FT-IR光谱。

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注:A和B:SEM;C和D:AFM。

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Orthogonal experimental design

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水平试验因素
A:硫酸铵质量分数(%)B:乙醇体积分数(%)C:超声功率(W)
12035300
22240400
32445500
), ArticleFig(id=1320166051376124667, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320166043356615359, language=CN, label=表1, caption=

正交试验设计

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水平试验因素
A:硫酸铵质量分数(%)B:乙醇体积分数(%)C:超声功率(W)
12035300
22240400
32445500
), ArticleFig(id=1320166051455816444, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320166043356615359, language=EN, label=Table 2, caption=

Results of orthogonal experiment

, figureFileSmall=null, figureFileBig=null, tableContent=
实验号ABCAAPs得率(%)
硫酸铵质量
分数
乙醇体积
分数
超声功率
111110.16±0.28
212211.28±0.31
313310.95±0.25
422310.01±0.29
523111.42±0.33
62129.83±0.21
733211.38±0.19
831311.24±0.23
932110.80±0.27
K132.3931.2332.38
K231.2632.0932.49
K333.4233.7532.20
k110.79710.41010.793
k210.42010.69710.830
k311.14011.25010.733
R0.7200.8400.097
), ArticleFig(id=1320166051535508221, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320166043356615359, language=CN, label=表2, caption=

正交试验结果

, figureFileSmall=null, figureFileBig=null, tableContent=
实验号ABCAAPs得率(%)
硫酸铵质量
分数
乙醇体积
分数
超声功率
111110.16±0.28
212211.28±0.31
313310.95±0.25
422310.01±0.29
523111.42±0.33
62129.83±0.21
733211.38±0.19
831311.24±0.23
932110.80±0.27
K132.3931.2332.38
K231.2632.0932.49
K333.4233.7532.20
k110.79710.41010.793
k210.42010.69710.830
k311.14011.25010.733
R0.7200.8400.097
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超声辅助双水相提取知母多糖工艺优化、结构表征及其免疫调节活性分析
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娄丽芳 1 , 李晋 1 , 张耀磊 1, 2
食品工业科技 | 工艺技术 2026,47(14): 225-234
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食品工业科技 |工艺技术 2026 , 47 (14) : 225 -234
超声辅助双水相提取知母多糖工艺优化、结构表征及其免疫调节活性分析
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娄丽芳1 , 李晋1, 张耀磊1, 2
作者信息
  • 1郑州铁路职业技术学院药学院,河南郑州 451460
  • 2河南省铁路食品安全管理工程技术研究中心,河南郑州 451460
作者简介:

娄丽芳(1987−),女,硕士,讲师,研究方向:代谢生理与代谢性疾病的机制,E-mail:

Process Optimization, Structural Characterization, and Immunomodulatory Activity of Ultrasound-assisted Aqueous Two-phase Extraction of Anemarrhena asphodeloides Polysaccharides
Lifang LOU1 , Jin LI1, Yaolei ZHANG1, 2
Affiliations
  • 1School of Pharmacy, Zhengzhou Railway Vocational & Technical College, Zhengzhou 451460, China
  • 2Henan Railway Food Safety Management Engineering Technology Research Center, Zhengzhou 451460, China
出版时间: 2026-07-15 doi: 10.13386/j.issn1002-0306.2025050239
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本研究旨在优化超声辅助双水相提取知母多糖(Anemarrhena asphodeloides polysaccharide,AAPs)工艺,并采用不同柱色谱技术分离纯化知母粗多糖,获得均一多糖馏分(AAPs-1-SG),并对其结构进行表征。在此基础上,通过MTT法测定AAPs-1-SG对RAW264.7细胞活力的影响;利用中性红法评价AAPs-1-SG对RAW264.7细胞的吞噬活性的影响。探究AAPs-1-SG对RAW264.7细胞中NO、IL-1β、IL-6和TNF-α水平的影响。结果表明,超声辅助双水相提取AAPs工艺参数为:硫酸铵质量分数24%、超声功率400 W、乙醇体积分数45%和料液比1:20 g/mL,AAPs得率为12.17%±0.25%。紫外光谱扫描发现AAPs-1-SG不含蛋白和核酸;红外光谱发现AAPs-1-SG具有典型的多糖红外吸收特性,具有α型和β型糖苷键;AAPs-1-SG主要由Glc、Ara和Man组成,其分子量为11298 Da;AAPs-1-SG经扫描电镜和原子力显微镜观察发现AAPs-1-SG呈不规则片状和孔状结构。此外,AAPs-1-SG可显著增加RAW264.7细胞活力、吞噬活性及提高NO、IL-1β、IL-6和TNF-α水平(P<0.05),进一步揭示AAPs-1-SG具有较好的免疫调节活性。研究结果为天然多糖高效提取提供重要的方式,也为知母多糖开发和利用提供重要参考。

知母多糖  /  超声辅助双水相提取  /  工艺优化  /  结构表征  /  免疫活性

This study aimed to optimize the ultrasound-assisted aqueous two-phase extraction (UATPE) process of Anemarrhena asphodeloides polysaccharide (AAPs), separate and purify the crude AAPs by different column chromatography techniques to obtain a uniform polysaccharide fraction (AAPs-1-SG), and characterize its structure. The effect of AAPs-1-SG on the viability of RAW264.7 cells was determined by the MTT method. The neutral red method was used to evaluate the effect of AAPs-1-SG on the phagocytic activity of RAW264.7 cells, and the effects of AAPs-1-SG on the levels of NO, IL-1β, IL-6 and TNF-α in RAW264.7 cells were investigated. The results showed that the process parameters of UATPE polysaccharide from Anemarrhena asphodeloides were obtained as follows: Ammonium sulfate mass fraction of 24%, ultrasonic power of 400 W, ethanol volume fraction of 45%, and solid-to-liquid ratio of 1:20 g/mL, and the yield of AAPs was 12.17%±0.25%. Ultraviolet spectral scanning revealed that AAPs-1-SG had no proteins or nucleic acids. FT-IR showed that AAPs-1-SG exhibited typical infrared absorption characteristics of polysaccharides and possessed α and β types glycosidic bonds. AAPs-1-SG was mainly composed of Glc, Ara, and Man, and its molecular weight was 11298 Da. Scanning electron microscopy and atomic force microscopy observed that AAPs-1-SG presented irregular sheet-like and porous structures. In addition, AAPs-1-SG could markedly increase the viability and phagocytic activity of RAW264.7 cells, and significantly improve the levels of NO, IL-1β, IL-6, and TNF-α (P<0.05), further revealing that AAPs-1-SG had better immunomodulatory activity. The findings can provide an important method for the efficient extraction of natural polysaccharides and also offer significant references for the development and utilization of AAPs.

Anemarrhena asphodeloides polysaccharides  /  ultrasound-assisted aqueous two-phase extraction  /  process optimization  /  structural characterization  /  immunomodulatory activity
娄丽芳, 李晋, 张耀磊. 超声辅助双水相提取知母多糖工艺优化、结构表征及其免疫调节活性分析. 食品工业科技, 2026 , 47 (14) : 225 -234 . DOI: 10.13386/j.issn1002-0306.2025050239
Lifang LOU, Jin LI, Yaolei ZHANG. Process Optimization, Structural Characterization, and Immunomodulatory Activity of Ultrasound-assisted Aqueous Two-phase Extraction of Anemarrhena asphodeloides Polysaccharides[J]. Science and Technology of Food Industry, 2026 , 47 (14) : 225 -234 . DOI: 10.13386/j.issn1002-0306.2025050239
知母(Anemarrhena asphodeloides Bunge)为百合科多年生草本植物,是传统中医常用的清热泻火、滋阴润燥药,其主要活性成分包括多糖、皂苷、黄酮等[1−2]。近年来,知母多糖(Anemarrhena asphodeloides polysaccharide,AAPs)因其显著的生物活性和良好的生物相容性备受关注。大量研究表明AAPs具有免疫调节、抗氧化、抗肿瘤、降血糖、调节肠道菌群等多种药理作用,其生物活性与结构特征密切相关[3−4]。然而,目前对AAPs的研究多集中于药理活性,其提取效率低、结构解析不完善等问题限制进一步开发与应用。因此,建立高效、环保的提取方法、阐明其结构特征,对推动AAPs的深度开发和利用具有重要意义。
目前,AAPs的提取方法主要包括热水浸提法、酸碱辅助提取法、酶解法及微波辅助提取法等[5]。热水浸提法操作简单,但存在提取效率低、耗时长、能耗高等问题,且高温可能导致多糖结构降解[6];酸碱辅助提取法虽能提高得率,但强酸或强碱环境易破坏多糖的糖苷键,影响其生物活性[7];酶解法条件温和、选择性高,但酶成本较高,且酶解产物复杂,后续纯化难度大[8]。近年来,超声辅助提取技术因其空化效应可有效破坏植物细胞壁,提高传质效率,被广泛应用于多糖提取,但其单独使用时仍存在选择性不足、提取物杂质较多等问题[9]。在纯化方面,传统方法主要依赖乙醇沉淀结合Sevage法脱蛋白,再经DEAE纤维素柱或凝胶色谱分离[10]。然而,乙醇沉淀法回收率较低,且有机溶剂用量大,不符合绿色化学发展趋势;Sevage法虽能有效去除蛋白质,但需多次重复操作,过程繁琐;柱层析法虽纯化效果好,但耗时较长,且规模化生产成本较高。双水相提取(Aqueous two-phase extraction,ATPE)作为一种新兴的绿色分离技术,通过两相体系的选择性分配,可实现多糖的高效富集和初步纯化,具有操作简便、条件温和、环境友好等优势[11−12]。目前,双水相体系在AAPs提取纯化中的应用研究较少,其最佳双水相体系组成尚不明确。因此,开发超声辅助双水相提取技术,优化工艺参数,解析AAPs结构特征,这已成为当前研究的关键问题。因此,在优化提取工艺的同时,需通过高效凝胶排阻色谱(High performance gel permeation chromatography,HPGPC)、红外光谱(Fourier transform infrared,FT-IR)、核磁共振等技术全面表征多糖结构,并结合体外细胞模型评价其免疫调节活性,以期明确“提取-结构-活性”三者之间的内在联系,这为高效开发和利用知母多糖提供重要参考。
本研究以知母为原料,采用超声辅助双水相系统提取AAPs,通过单因素实验结合正交试验优化硫酸铵质量分数、乙醇体积分数、超声功率、料液比关键参数,建立高效、低耗的提取工艺;进一步通过分级纯化(DEAE-52纤维素柱和Sephadex G-100凝胶柱)获得均一性多糖组分(AAPs-1-S),并采用紫外光谱(Ultraviolet-visible,UV)、FT-IR、HPGPC、气相色谱-质谱联用(Gas chromatography-mass spectrometry,GC-MS)等技术表征其结构,并通过RAW264.7细胞评价其免疫调节活性。本文研究结果旨在为AAPs的深度开发和利用提供重要参考。
知母 安徽协和成药业有限公司;DEAE-52纤维素和Sephadex G-100葡聚糖凝胶 石家庄盛平工业科技有限公司;硫酸铵、氯化钠 分析纯,兰州朗博精细化工试剂有限公司;氢氧化钠、苯酚、浓硫酸 分析纯,天津华岐试剂有限公司;3500 Da透析袋 北京艾文生物试剂有限公司;RAW264.7细胞 北京协和细胞库;脂多糖(Lipopolysaccharides,LPS) 上海源叶生物科技有限公司;NO(ml059000)、IL-1β(ml106733)、IL-6(ml064292)、TNF-α(ml059784)测定试剂盒 上海酶联生物科技有限公司。
CP-2超声波提取仪 昆山舒美机械设备有限公司;SNE-3200M台式扫描电镜 深圳市武训科技有限公司;RE-3002旋转蒸发仪 郑州凯瑞仪器设备有限公司;TU-1901双光束红外分光光度计 青岛精诚仪器仪表有限公司;7230G紫外分光光度计 上海百利仪器设备有限公司;KL05R离心机 上海沃信仪器设备有限公司;VF-600真空冷冻干燥机 北京瑞科仪器有限公司;SE-2200高效凝胶排阻色谱 浙江福立分析仪器有限公司;Flex-Axiom原子力显微镜 纳瑟(上海)纳米科技有限公司;Heracell 240i CO2培养箱 赛默飞世尔科技公司;HBS-1096A全自动酶标仪 南京德铁生物科技有限公司。
在预实验的基础上,称取5 g知母粉末样品置于200 mL锥形瓶中,然后加入150 mL双水相体系(无水乙醇:硫酸铵:水=3:2:5,V/W/V),充分搅拌,随后置于超声提取仪中进行超声辅助提取,提取结束后,将提取液置于分液漏斗中,待提取液完全分层后,收集下层的提取液进行离心(8000 r/min,20 min),收集上清液,然后置于真空冷冻干燥机中将其冻干,最终获得粗AAPs。
依据Tan等[13]的方法测定AAPs得率,具体如下:分别取0、0.1、0.2、0.3、0.4 mL的0.1 mg/mL的D-无水葡萄糖标准品于5 mL的试管,随后加入去离子水将其补至0.5 mL,充分混匀,再加入0.5 mL 5%苯酚溶液和2.5 mL浓硫酸,沸水浴反应30 min后,在波长490 nm 处测定样品吸光值。以样品吸光度和葡萄糖标准品浓度分别为纵坐标和横坐标,构建标准方程:Y=0.0082X+0.1075,R2=0.9998。该方程在0~100 μg/mL葡萄糖质量浓度范围内具有较好的线性关系。将AAPs(10 mg)配制成0.1 mg/mL的待测样品溶液,取0.5 mL待测样品加入0.5 mL 5%苯酚溶液和2.5 mL浓硫酸沸水浴反应30 min,冷却后测定样品吸光度,按式(1)计算粗AAPs得率(Y)。
$\rm Y=\frac{C\times V}{m}\times 1000\times 100 $
式中:Y为粗AAPs得率(%),C为质量浓度(μg/mL),V为样品总体积(mL),m为粗AAPs质量(mg)。
称取5.0 g知母样品作为提取对象,考察硫酸铵质量分数、乙醇体积分数、超声功率和料液比对AAPs得率的影响。
固定乙醇体积分数、超声功率和料液比分别为45%、300 W和1:20 g/mL,探究硫酸铵质量分数16%、18%、20%、22%、24%对AAPs得率的影响。
固定硫酸铵质量分数、超声功率和料液比分别为20%、300 W和1:20 g/mL,探究乙醇体积分数35%、40%、45%、50%、55%对AAPs得率的影响。
固定硫酸铵质量分数、乙醇体积分数和料液比分别为20%、45%和1:20 g/mL,探究超声功率100、200、300、400、500 W对AAPs得率的影响。
固定硫酸铵质量分数、乙醇体积分数和超声功率分别为20%、45%和300 W,探究料液比1:10、1:15、1:20、1:25、1:30 g/mL对AAPs得率的影响。
在单因素实验的基础上,以AAPs得率为指标。对本研究三个主要因素(硫酸铵质量分数、乙醇体积分数和超声功率)进行3因素3水平正交试验,优化超声辅助双水相提取AAPs工艺,正交试验设计如表1所示。
首先利用无水乙醇醇沉粗AAPs,然后通过Sevage法去除粗AAPs中的蛋白质,最后利用透析袋(截留分子量为3500 Da)连续透析72 h,待透析结束后,将其离心(8000 r/min,15 min)以获得上清液,随后采用真空冷冻干燥机将其冻干。将冻干的样品配制成质量浓度为20 mg/mL的样品溶液。将1 mL样品首先通过预处理好的DEAE-52纤维素色谱柱(2.6 cm×20 cm),然后用蒸馏水平衡层析柱,再利用蒸馏水和不同浓度的NaCl溶液(0、0.1、0.2、0.4 mol/L NaCl)进行分步洗脱,按照每管5 mL收集不同多糖馏分,并利用苯酚-硫酸法在波长490 nm处测定样品的吸光度,绘制洗脱曲线,最终收集得到两种多糖馏分(AAPs-1和AAPs-2)。随后将主要馏分(AAPs-1)再通过Sephadex G-100柱(1.6 cm×40 cm)进一步纯化,采用同样方式收集馏分(AAPs-1-SG)和检测其吸光度,绘制洗脱曲线,然后通过不同方式对AAPs-1-SG进行结构表征。
采用Xue等[14]描述的采用高效凝胶排阻色谱(HPSEC)法测定AAPs-1-SG分子量,并略微修改。本研究设定柱温、进样量、流动相质量浓度和流速分别为40 ℃、20 µL、0.2 mol/L NaCl和0.6 mL/min。选取6种葡聚糖标准品作为标准品,以分子量1、5、10、25、50、500 kDa来绘制标准方程,并以保留时间(TR)为横坐标和分子量对数(lgMw)为纵坐标,通过Origin软件拟合获得回归方程。同时在相同条件下,将AAPs-1-SG样品进行相同分析,获得TR,将其代入到回归方程中,即可获得AAPs-1-SG的分子量。
采用桑雨梅[15]的方法测定AAPs-1-SG中的单糖组成,并略微修改。具体操作如下:配制标准品溶液:准确称取阿拉伯糖(Ara)、葡萄糖(Glu)、甘露糖(Man)、半乳糖(Gal)、木糖(Xyl)和岩藻糖(Fuc)标准品,利用水配制成一系列浓度梯度为0.5、1、5、10、20和30 μg/mL的混合标准溶液;样品前处理:将适量AAPs-1-SG置于色谱瓶中,加入1 mL浓度为2 mol/L的三氟乙酸(TFA)溶液,于121 ℃恒温水浴中进行2 h的酸水解反应,水解完成后通入氮气吹干溶剂,并用99.99%甲醇进行三次循环清洗去除残留TFA。最后,加水溶解样品移至样品瓶中待测。
将AAPs-1-SG溶解于去离子水中,配制成质量浓度为1.0 mg/mL的溶液。以去离子水为参比,在200~400 nm波长范围内进行紫外光谱扫描,分析其紫外吸收特性。
精确称量经干燥处理的AAPs-1-SG样品置于玛瑙研钵内进行研磨分散,随后按照KBr粉末与AAPs-1-SG样品的质量比300:1(g/g)加入KBr,通过研磨混合至均匀粉末状态,进行压片。将制备好的样品置于红外光谱仪中,在4000~400 cm−1波数范围内对AAPs-1-SG样品进行红外光谱扫描,分辨率为4 cm-1,扫描64次,分析其官能团信息。
在SEM样品台座表面均匀涂抹导电胶,取适量干燥后的AAPs-1-SG样品粉末分散于胶表面,通过轻敲台座基底使样品均匀附着,最后采用洗耳球垂直于台座表面吹拂,去除松散未固定的多余颗粒,确保样品表面清洁度满足成像要求。最后,将处理后AAPs-1-SG样品置于真空镀膜仪中进行溅射镀金处理2 min,以增强导电性能并减少表面电荷积累,并置于真空环境下进行形貌观察与图像采集。
采用AFM观察冻干后的AAPs-1-SG样品的表观形貌。具体操作步骤如下:将冻干后的AAPs-1-SG样品制备成质量浓度为2 μg/mL样品溶液,然后通过0.22 μm膜,随后取10 μL AAPs-1-SG样品溶液均匀滴在云母片表面,自然晾干,利用Multimode 8模块观察AAPs-1-SG样品的形态。
通过MTT法评价RAW264.7细胞活力。选取对数RAW264.7细胞(100 μL/孔,2×105个/mL)接种至96孔板中,置于37 ℃、5% CO2培养箱中,培养24 h后,吸弃培养基,后向每孔中加入100 μL不同质量浓度(0、5、10、20、40 μg/mL)AAPs-1-SG的培养基。其中,0 μg/mL AAPs-1-SG的培养基为对照组,不含RAW264.7细胞的培养基为空白对照,参考王歆彤[5]的方法,以LPS(1 μg/mL)的培养基为阳性对照组,每组为6个复孔进行重复实验,待培养24 h后,再向空白组、对照组和实验组中加入100 μL MTT溶液,37 ℃避光培养4 h,随后再向每孔中加入100 μL DMSO,充分振荡,然后静置15 min,随后利用全自动酶标仪在波长490 nm处测定每孔的吸光度,依据式(2)计算RAW264.7细胞活力。
$\rm 细胞活力(\text{%})=\frac{{A}_{样品}-{A}_{空白}}{{A}_{对照}-{A}_{空白}}\times 100 $
本实验利用中性红法评价RAW264.7细胞的吞噬活性。具体实验步骤如下:首先按照1.2.7.1方式进行细胞分组,参考王歆彤[5]的方法选取LPS剂量,并增加阳性对照组(1 μg/mL的LPS处理RAW264.7细胞),待处理结束后,向每个孔中加入(100 μL,0.1%)中性红染液,在37 ℃培养4 h,然后采用缓冲液PBS洗涤3次,随后再向每孔中加入100 μL醇酸裂解液。通过全自动酶标仪在波长540 nm处测定每孔吸光度,按照式(3)计算RAW264.7细胞的吞噬活性。
$\rm \text{RAW264.7}细胞中性红吞噬率(\text{%})=\frac{{A}_{样品}-{A}_{空白}}{{A}_{对照}-{A}_{空白}}\times 100 $
利用试剂盒说明书测定AAPs-1-SG对RAW264.7细胞中NO和细胞因子(IL-1β、IL-6、TNF-α)分泌水平的影响。
本研究中单因素和正交试验均重复三次,采用Origin 9.0软件绘图,并利用SPSS 20.0统计学软件对数据进行统计分析,结果以平均值±标准差表示,P<0.05为差异显著。
硫酸铵质量分数可显著影响AAPs得率。因此,本研究探究硫酸铵质量分数对AAPs得率的影响,其结果如图1A所示。由图1A可知,硫酸铵质量分数低于22%时,随硫酸铵质量分数增加AAPs得率显著增加(P<0.05)。这可能是由于随硫酸铵质量分数增加,双水相下相中溶解多糖能力增加,进而增加其提取率[16]。然而,当硫酸铵质量分数超过22%,进一步增加硫酸铵质量分数,反而显著降低AAPs得率(P<0.05)。这可能归因于高浓度硫酸铵会诱导AAPs与盐形成复合沉淀,导致AAPs在盐相中的有效浓度降低,进而导致AAPs得率下降[17]。该研究结果与Xue等[14]利用超声辅助双水相提取百合多糖的结果一致,多糖得率也随硫酸铵质量分数增加而显著降低(P<0.05)。基于上述分析,选定20%、22%和24%三个硫酸铵质量分数水平进行正交试验。
乙醇体积分数对双水相体系至关重要,同时也在一定程度上影响AAPs得率。因此,本研究选择乙醇体积分数作为重要因素,探究其对AAPs得率的影响,其结果如图1B所示。由图1B可知,当乙醇体积分数在35%~45%范围内,随乙醇体积分数增加AAPs得率呈现显著增加的趋势(P<0.05)。这种现象主要归因于乙醇体积分数增加有利于提高有机相中多糖分子的溶解度及传质系数,促进多糖向下相中迁移,进而提高AAPs得率[18]。然而,当乙醇体积分数超过45%并提升至55%时,随乙醇体积分数增加AAPs得率呈现显著下降趋势(P<0.05)。这一方面可能是由于高乙醇体积分数引发硫酸铵盐与多糖的共沉淀效应[14];另一方面高乙醇体积分数可促进醇溶性杂质的溶解,进而降低AAPs得率[19]。基于上述分析,选择35%、40%和45%三个乙醇体积分数水平做后续的正交试验。
超声功率作为超声辅助双水相提取知母多糖最重要的实验因素之一。因此,本研究探究超声功率对AAPs得率的影响,其结果如图1C所示。由图1C可知,当超声功率在100~400 W范围内,随超声功率增加AAPs得率呈显著增加的趋势(P<0.05)。这种现象主要归因于超声功率增加有利于增强其空化效应,高频声波产生的空化泡崩塌可有效破坏知母细胞壁的物理屏障,提高细胞内多糖分子的传质阻力系数,进而提高AAPs得率[20]。继续增加超声功率,AAPs得率呈显著降低的趋势(P<0.05)。这可能是由于高超声功率会引发较强的机械剪切力及热效应,导致多糖糖苷键被破坏,并发生降解,进而导致AAPs得率降低[14]。基于上述分析,选择300、400及500 W作为超声功率的三个水平进行后续的正交试验。
料液比也在一定程度上影响AAPs得率。因此,本研究选择料液比作为影响AAPs得率的重要因素进行单因素实验,其结果如图1D所示。由图1D可知,当料液比1:10、1:15、1:20 g/mL三个水平下,随料液比增加AAPs得率呈显著增加的趋势(P<0.05)。这主要是由于随着料液比增加AAPs细胞内外的多糖浓度差较大,可进一步促进多糖由内向外扩散,进而增加AAPs得率[21]。当料液比大于1:20 g/mL时,进一步增加料液比,AAPs得率无显著变化(P>0.05)。该研究结果与田艳花等[22]采用微波辅助双水相提取百合多糖的结果一致。基于上述分析,本研究最终选择1:20 g/mL作为最优料液比。
超声辅助双水相提取AAPs的正交试验结果如表2所示。由表2可知,超声功率、硫酸铵质量分数和乙醇体积分数极差分别为0.097、0.720和0.840,进一步表明这三个因素对AAPs的影响主次为:乙醇体积分数(B)>硫酸铵质量分数(A)>超声功率(C),最优水平组合为A3B3C2,即A:24%、B:45%、C:400 W和料液比1:20 g/mL为最优水平。本研究利用优化得到的最优参数进行3次重复试验,最终AAPs得率为12.17%±0.25%,说明正交试验可优化超声辅助双水相提取AAPs。
本研究首先采用DEAE-52纤维素树脂对在最优工艺下获得的AAPs粗提物进行分离纯化,其结果如图2A。由图2A可知,本试验通过梯度洗脱成功制备两个多糖馏分分别为AAPs-1(纯水洗脱馏分)和AAPs-2(0.1 mol/L NaCl洗脱馏分)。其中AAPs-1为中性多糖,且含量高于AAPs-2。因此,本研究选择主要馏分(AAPs-1)进一步采用Sephadex-G100葡聚糖凝胶柱分离纯化,其结果见图2B。由图2B可知,AAPs-1经Sephadex-G100葡聚糖凝胶柱分离纯化后最终获得单一的对称峰,进一步说明AAPs-1-SG为均一多糖馏分,后续采用不同方式对其进行结构表征。
多糖分子量是决定其理化特性与生物功能活性的关键参数。本研究采用HPSEC法对AAPs-1-SG进行分子量测定,其结果如图3A所示。由图3A可知,以保留时间(TR)为横坐标,并以分子量对数(lgMw)为纵坐标,进行线性拟合,所得方程为lgMw=5.945−0.215TR(R2=0.9926)。将AAPs-1-SG样品在相同色谱条件下进行分析,AAPs-1-SG特征峰保留时间为8.8 min,通过方程计算得到AAPs-1-SG的分子量11298 Da。陈君诚[2]通过分级醇沉和DEAE-52柱层析分离纯化获得的中性多糖馏分(AABP-1B)的分子量为105 kDa,显著高于AAPs-1-SG的分子量。这可能是由于多糖纯化方式和来源不同所导致。
采用离子色谱法结合电化学检测器分析AAPs-1-SG的单糖组成,其结果如图3B所示。由图3B可知,AAPs-1-SG是由阿拉伯糖(Ara)、葡萄糖(Glc)和甘露糖(Man)组成,其中Glc占比最大,其次是Man和Ara。表明AAPs-1-SG是一种主要以Glc为主的杂多糖。该结果与陈君诚[2]通过分级醇沉和DEAE-52柱层析分离纯化获得的中性多糖馏分(AABP-1B)由Man、Glc、Gal、GalA、Ara和Rha组成的结果存在一定的差异。这可能归因于知母多糖的来源和提取/纯化方式不同所造成的。
本实验采用紫外光谱仪在波长200~400 nm范围内对AAPs-1-SG进行紫外光谱扫描,其结果如图3C所示。由图3可知,AAPs-1-SG样品在260 nm和280 nm处无特征紫外吸收峰,进一步表明AAPs-1-SG不含有核酸和蛋白质,也证实粗AAPs经DEAE-52和Sephadex G-100柱色谱技术的纯化效果较好。
FT-IR光谱是一种能够有效表征多糖分子中官能团类型、糖苷键连接方式及糖环构型的光谱分析技术。本研究采用该技术对纯化后的AAPs-1-SG样品进行红外光谱扫描,结果见图3D。由图3D可知,AAPs-1-SG样品在3263 cm−1处出现强而宽吸收峰。该吸收峰主要是由AAPs-1-SG样品中O-H基团的伸缩振动引起[23]。AAPs-1-SG样品在2958 cm−1处也出现明显的吸收峰,这可能是由于AAPs-1-SG样品糖环结构中C-H化学键的伸缩振动引起[24]。此外,AAPs-1-SG样品在1414 cm−1和1625 cm−1处也出现特征峰,该峰是分别是由于AAPs-1-SG样品中C=O双键的伸缩振动和-COOH伸缩振动引起[25]。AAPs-1-SG样品在828 cm−1、871 cm−1和964 cm−1处均出现特征吸收峰,表明AAPs-1-SG样品主链含有α-型和β-型糖苷键[26]。
多糖的表面微观形貌特征与其性质密切相关。因此,本研究利用SEM在1000×和2000×放大倍数下观察AAPs-1-SG样品的微观结构,其结果如图4A和图4B可知,AAPs-1-SG呈不规则片状和棒状结构,且表面呈现多孔状和不规则的凸起结构。在2000×高倍放大倍率下,AAPs-1-SG也呈现不同孔径的孔状和球形结构,且表面平滑。综上分析发现AAPs-1-SG结构复杂,这可能是由于AAPs-1-SG具有复杂的糖链结构和分支结构,使其结构复杂,进而有助于发挥其生物活性。此外,AAPs-1-SG在形态上的差异可源于多糖的分子量、单糖组成及空间结构等多种因素的综合影响[4]。
目前,AFM被广泛用于解析多糖的形貌、聚集态、分子链构象及力学性质。本研究采用AFM观察AAPs-1-SG的表面形貌,其结果如图4C和图4D所示。由图4C可知,AAPs-1-SG表面呈现不规则状凸起。此外,AAPs-1-SG的2D平面图出现大量斑点。这可能是由于AAPs-1-SG分子链上的羟基提供了强大的分子间和分子内相互作用力,使得多糖链能够相互聚集或与水分子产生紧密结合,进而呈现不规则的形状[14]。这种差异上很可能与其较低的分子量密切相关,因为较小的分子量往往使得分子构象更为紧凑[27]。这与AAPs-1-SG的SEM结果一致,进一步证实AAPs-1-SG呈不规则的微观结构。
MTT法测定AAPs-1-SG对RAW264.7细胞活力的影响,其结果如图5A所示。与对照组(0 μg/mL AAPs-1-SG)相比,LPS组的RAW264.7细胞活力显著增加(P<0.05),低剂量(5 μg/mL)AAPs-1-SG干预组中RAW264.7细胞活力提高13.28%,高剂量(40 μg/mL)AAPs-1-SG干预组中RAW264.7细胞活力提高41.17%。进一步表明AAPs-1-SG在浓度范围为5~40 μg/mL时对RAW264.7细胞无毒副作用。因此,根据本实验的结果选择AAPs-1-SG的浓度范围为5~40 μg/mL进行后续的实验。
巨噬细胞的吞噬能力作为天然免疫系统中的关键吞噬因子,能够吞噬病原微生物。AAPs-1-SG对RAW264.7细胞吞噬活性的影响可通过评估RAW264.7细胞摄入中性红的数量来评价,其结果如图5B所示。由图5B可知,与对照组(0 μg/mL AAPs-1-SG)相比,当AAPs-1-SG浓度在5~20 μg/mL范围内,随AAPs-1-SG浓度增加,AAPs-1-SG对RAW264.7细胞的吞噬率显著增加(P<0.05),且呈剂量依赖性,进一步表明AAPs-1-SG可激活RAW264.7细胞,并增强其吞噬活性,进而提高其免疫活性。该研究结果与Xue等[28]探究纯化后的玉米须酸性多糖馏分对RAW264.7细胞吞噬活性的影响一致。
NO作为RAW264.7细胞免疫应答过程中释放的信号传导分子,对肿瘤细胞和病毒微生物具有较好的毒性作用[29]。因此,本研究采用试剂盒测定AAPs-1-SG对RAW264.7细胞NO和细胞因子的影响,其结果如图6A所示。与空白对照组(0 μg/mL AAPs-1-SG)相比,AAPs-1-SG能显著刺激RAW264.7细胞分泌NO,且呈剂量依赖关系(P<0.05)(图6A),进一步表明AAPs-1-SG具有较强的免疫刺激作用。
巨噬细胞分泌多种细胞因子,如IL-1β、IL-6和TNF-α,这些细胞因子是评估生物活性成分免疫调节活性的重要因子[30]。其中,IL-1β被认为是关键的炎症介质之一。大量研究表明天然多糖通过调节IL-1β的分泌可以增强免疫活性[28]。IL-6是一种多效性细胞因子,在免疫调节、炎症反应、造血及代谢中发挥核心作用。其与免疫活性的关系复杂,具有双向调控特性,既可促进炎症和免疫激活,也可参与免疫抑制和组织修复[31]。TNF-α是一种核心促炎细胞因子,由活化的巨噬细胞、T细胞、NK细胞及肥大细胞等产生,在免疫调节、炎症反应、细胞凋亡及组织稳态中发挥多效性作用[32]。因此,本研究通过测定RAW264.7细胞内IL-1β、IL-6和TNF-α的水平来评估AAPs-1-SG的免疫调节活性,其结果如图6B~图6D所示。由图6B~图6D可知,与对照组(0 μg/mL AAPs-1-SG)相比,AAPs-1-SG(5~40 μg/mL)处理RAW264.7细胞,AAPs-1-SG可显著增加RAW264.7细胞分泌IL-1β、IL-6和TNF-α水平(P<0.05),进一步表明AAPs-1-SG具有较好的免疫调节活性。因此,AAPs-1-SG可用作天然免疫增强剂,用于功能性食品、药物和保健品的开发中。
多糖的免疫活性与分子量与单糖组成等密切相关[33−34],而且具有高Glc和Man的多糖较易与巨噬细胞甘露糖受体结合,进一步激活免疫应答反应[35]。此外,多糖的分子量也影响其免疫活性[36]。这也解释了AAPs-1-SG具有较高免疫增强活性的原因。此外,通过FT-IR也证实AAPs-1-SG具有α型和β型糖苷键,这也是其具有较好免疫活性的重要原因[37]。值得注意的是,当多糖分子量>10 kDa时,较大的分子量提供更多抗原表位(B细胞表位和T细胞表位),能有效激活B细胞和T细胞,引发体液免疫和细胞免疫[38]。本研究通过HPGPC测得AAPs-1-SG分子量为11298 Da,这也是AAPs-1-SG具有较高免疫增强活性的原因。
本研究获得最优的超声酶辅助双水相提取AAPs工艺参数为:硫酸铵质量分数24%、超声功率400 W、乙醇体积分数45%和料液比1:20 g/mL,AAPs得率为12.17%±0.25%。利用不同柱色谱技术最终获得均一的多糖馏分(AAPs-1-SG),其主要由Glc、Ara和Man组成,分子量为11298 Da。此外,AAPs-1-SG中不含蛋白和核酸,具有α型和β型糖苷键,并呈不规则片状和孔状结构。AAPs-1-SG可增加RAW264.7细胞活力和提高其吞噬活性。此外,AAPs-1-SG可增加NO、IL-1β、IL-6和TNF-α水平,进一步表明AAPs-1-SG具有较好的免疫调节活性。本研究仅仅局限于对AAPs-1-SG的初级结构进行表征,也未对其免疫调节的分子机制进行探究。后续可通过甲基化和核磁进一步明确AAPs-1-SG结构,并利用蛋白质组学和代谢组学等手段继续深入分析其免疫调节的分子机制,并结合体内实验进一步验证AAPs-1-SG的有效性。

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2026年第47卷第14期
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doi: 10.13386/j.issn1002-0306.2025050239
  • 接收时间:2025-05-26
  • 首发时间:2026-10-22
  • 出版时间:2026-07-15
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  • 收稿日期:2025-05-26
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    1郑州铁路职业技术学院药学院,河南郑州 451460
    2河南省铁路食品安全管理工程技术研究中心,河南郑州 451460
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2种不同金属材料的力学参数
科
Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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