Article(id=1320883666692199191, tenantId=1146029695717560320, journalId=1260987677001138203, issueId=1320883558764359808, articleNumber=null, orderNo=null, doi=10.13386/j.issn1002-0306.2025040349, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1745683200000, receivedDateStr=2025-04-27, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1792852806971, onlineDateStr=2026-10-24, pubDate=1776182400000, pubDateStr=2026-04-15, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1792852806971, onlineIssueDateStr=2026-10-24, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1792852806971, creator=13701087609, updateTime=1792852806971, updator=13701087609, issue=Issue{id=1320883558764359808, tenantId=1146029695717560320, journalId=1260987677001138203, year='2026', volume='47', issue='8', pageStart='1', pageEnd='524', issueExtLink='null', onlineDate='null', pubDate='1776182400000', pubDateStr='2026-04-15', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1792852781239, creator='13701087609', updateTime=1792852781239, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext=null, issueFiles=null, downloadFileDto=null}, startPage=153, endPage=161, ext={EN=ArticleExt(id=1320883667031937816, articleId=1320883666692199191, tenantId=1146029695717560320, journalId=1260987677001138203, language=EN, title=Preparation, Characterization of Rosa roxburghii Tratt. Nanovesicles and Its Antioxidant, Hypoglycemic, and Antihemolytic Activities, columnId=1261336277291548795, journalTitle=Science and Technology of Food Industry, columnName=Research and Investigation, runingTitle=null, highlight=null, articleAbstract=

To deeply investigate the structural characteristics and activities of nanovesicles derived from Rosa roxburghii Tratt. (RDNs), they were isolated, extracted, and characterized. Additionally, their antioxidant, hypoglycemic, and anti-hemolytic activities against Staphylococcus aureus exotoxin were explored. The RDNs were isolated using ultracentrifugation, and their morphology was characterized through transmission electron microscopy (TEM). The protein, lipid, and RNA composition/concentrations were quantified employing the BCA assay, thin-layer chromatography (TLC), and RNA extraction kits, respectively. The antioxidant capacity was assessed using DPPH and ABTS+ radical scavenging assays, while the hypoglycemic activity was evaluated through α-glucosidase and α-amylase inhibition assays. Using 2% rat erythrocytes as the research object, the experiment was divided into blank control group, positive control group, S. aureus-EVs group, RDNs group, and RDNs+S. aureus-EVs group, and in vitro anti-hemolytic rate of RDNs was detected. The results indicated that RDNs had an average hydrodynamic diameter of 155.27±1.39 nm, a Zeta potential of −8.60±0.64 mV, and maintained stability at −80 ℃ for 12 days. The particles remained stable during the first 6 days of storage at 4 ℃, but exhibited significant particle size changes after surpassing the 6-day mark (P<0.01). Particle size remained unchanged (P>0.05) at pH1.2, while pH6.5 showed significant change in particle size (P<0.05). Biochemical analysis uncovered the presence of protein (5.50±0.00 mg/mL), lipid (4.23±0.40 mg/mL), and RNA (3.91±1.97 μg/mL). Notably, protein bands were observed at 24, 50~70, and 70 kDa. Lipid components exhibited an intricate composition, which included phytosterols and lecithins. Concentration-dependent (0~212.30 mg/mL) scavenging of DPPH and ABTS+ radicals was observed, with the half-inhibitory concentrations (IC50) for the two radicals being 112.90 and 64.38 mg/mL, respectively. Additionally, when the concentration reached 212.30 mg/mL, the RDNs were capable of eliminating 99.80% of ABTS+. The α-glucosidase and α-amylase inhibition rates were 48% and 21%, respectively, significantly lower than positive controls (P<0.01). The hemolysis rates were nearly 0 in the RDNs group, 64% in the S. aureus-EVs group, and 8% in the RDNs+S. aureus-EVs group, which was significantly lower than that in the S. aureus-EVs group (P<0.01). The RDNs had antioxidant and hypoglycemic activities and could exert anti-hemolytic effects against S. aureus exotoxins, laying a foundation for their potential applications in the fields of antioxidants and natural antibacterial agents.

, authors=Mingwei CAO1, Yuxin PANG1, *, Yongyao WEI2, Tiantian WANG1, Fangxue DENG1, Bingnan LIU1, Chang LIU1, *, authorsList=Mingwei CAO, Yuxin PANG, Yongyao WEI, Tiantian WANG, Fangxue DENG, Bingnan LIU, Chang LIU, authorCompany=null, correspAuthors=Yuxin PANG, Chang LIU, 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=1320883668776768293, articleId=1320883666692199191, tenantId=1146029695717560320, journalId=1260987677001138203, language=CN, title=刺梨纳米囊泡的制备、表征及其抗氧化、降血糖与抗毒溶血活性研究, columnId=1261336277849391232, journalTitle=食品工业科技, columnName=研究与探讨, runingTitle=null, highlight=null, articleAbstract=

为深入研究刺梨来源纳米囊泡(Rosa roxburghii Tratt.-derived nanovesicles,RDNs)的结构特征及其活性,对其进行分离提取及表征,并探究其抗氧化、降血糖及抗金黄色葡萄球菌(Staphylococcus aureus,S. aureus)外毒素溶血活性。采用超速差速离心法提取RDNs,通过透射电镜(TEM)观察形态,结合BCA法、薄层色谱法和RNA提取等方法分别检测蛋白质、脂质和RNA的成分及浓度。利用DPPH和ABTS+自由基清除体系评估抗氧化能力,检测RDNs对α-葡萄糖苷酶和α-淀粉酶的抑制能力以评估降血糖活性,以2%大鼠红细胞为研究对象,将实验分为空白对照组、阳性对照组、S. aureus-EVs(S. aureus-derived extracellular vesicles)组、RDNs组和RDNs+S. aureus-EVs组,检测RDNs的体外抗溶血率。结果表明,RDNs平均粒径为155.27±1.39 nm,Zeta电位为−8.60±0.64 mV,−80 ℃保存12 d稳定,4 ℃保存6 d以内稳定,超过6 d则粒径显著变化(P<0.01),pH为1.2时粒径无显著变化(P>0.05),pH为6.5时粒径变化显著(P<0.05);RDNs含蛋白质(5.50±0.00 mg/mL)、脂质(4.23±0.40 mg/mL)和RNA(3.91±1.97 μg/mL),蛋白分布于24、50~70、70 kDa,脂质类成分复杂,其中含有植物甾醇类和卵磷脂类。在0~212.30 mg/mL范围内,RDNs对DPPH、ABTS+自由基的清除效果与浓度呈正相关,且其对两种自由基的半抑制浓度(IC50)分别为112.90和64.38 mg/mL,此外,当浓度为212.30 mg/mL时,RDNs对ABTS+自由基的清除率可达99.80%;对α-葡萄糖苷酶和α-淀粉酶的抑制率分别为48%和21%,但其活性显著低于阳性药组(P<0.01);RDNs组溶血率趋近于0,S. aureus-EVs组溶血率为64%,RDNs+S. aureus-EVs组溶血率为8%,显著低于S. aureus-EVs组(P<0.01)。刺梨纳米囊泡具有抗氧化、降血糖活性且能发挥抗S. aureus外毒素溶血的作用,为其在抗氧化领域和天然抗菌剂领域的潜在应用奠定了基础。

, authors=曹明未1, 庞玉新1, *, 魏永耀2, 王甜甜1, 邓芳雪1, 刘炳楠1, 刘畅1, *, authorsList=曹明未, 庞玉新, 魏永耀, 王甜甜, 邓芳雪, 刘炳楠, 刘畅, authorCompany=null, correspAuthors=庞玉新, 刘畅, authorNote=

曹明未(2000−),女,硕士研究生,研究方向:中药民族药开发研究,E-mail:

, correspAuthorsNote=
庞玉新(1975−),男,博士,教授,研究方向:中药民族药开发研究,E-mail:。
刘畅(1988−),女,博士,副教授,研究方向:中药民族药开发研究,E-mail:。
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曹明未(2000−),女,硕士研究生,研究方向:中药民族药开发研究,E-mail:

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曹明未(2000−),女,硕士研究生,研究方向:中药民族药开发研究,E-mail:

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Microorganisms, 2024, 12(3): 531., articleTitle=null, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1320883668986483494, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, xref=1, ext=[AuthorCompanyExt(id=1320883668994872103, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, companyId=1320883668986483494, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China), AuthorCompanyExt(id=1320883669003260712, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, companyId=1320883668986483494, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1贵州中医药大学药学院,贵州贵阳 550025)]), AuthorCompany(id=1320883670655816489, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, xref=2, ext=[AuthorCompanyExt(id=1320883670664205098, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, companyId=1320883670655816489, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China), AuthorCompanyExt(id=1320883670672593707, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, companyId=1320883670655816489, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2广东药科大学药学院,广东广州 510006)])], figs=[ArticleFig(id=1320883673226924889, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=EN, label=Fig.1, caption=Extraction process of RDNs, figureFileSmall=CX50JsYLceyV3AIMV7ldmQ==, figureFileBig=1aJMH/UPNSk/KY0Mcf2P9g==, tableContent=null), ArticleFig(id=1320883673352754010, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=CN, label=图1, caption=RDNs的提取流程, figureFileSmall=CX50JsYLceyV3AIMV7ldmQ==, figureFileBig=1aJMH/UPNSk/KY0Mcf2P9g==, tableContent=null), ArticleFig(id=1320883673516331867, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=EN, label=Fig.2, caption=Extraction of RDNs, figureFileSmall=RYmy6XFynjAllhqH9GxSSw==, figureFileBig=qbCSYw1XWZTnvI0ULWrDWw==, tableContent=null), ArticleFig(id=1320883673604412252, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=CN, label=图2, caption=RDNs的提取

注:A:RDNs的形态;B:RDNs的粒径分布图;C:RDNs的TEM(左图标尺200 nm,右图标尺100 nm)。

, figureFileSmall=RYmy6XFynjAllhqH9GxSSw==, figureFileBig=qbCSYw1XWZTnvI0ULWrDWw==, tableContent=null), ArticleFig(id=1320883675256968029, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=EN, label=Fig.3, caption=Components of RDNs, figureFileSmall=0eeL9wMRXWH01kmGWuDfwg==, figureFileBig=Nc6GsKaBYNHOAbO/RhWy1g==, tableContent=null), ArticleFig(id=1320883675336659806, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=CN, label=图3, caption=RDNs 的组成成分

注:A:RDNs蛋白分布图;B:RDNs脂质类别分布图(左侧为在紫外下有荧光脂质类成分的斑点;右侧为在正常光下其他无荧光脂质类成分的斑点);泳道1为RDNs样品,泳道2为β-谷甾醇标准品,泳道3为卵磷脂标准品。

, figureFileSmall=0eeL9wMRXWH01kmGWuDfwg==, figureFileBig=Nc6GsKaBYNHOAbO/RhWy1g==, tableContent=null), ArticleFig(id=1320883675399574367, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=EN, label=Fig.4, caption=Stability of RDNs, figureFileSmall=VzfDy02OAVHmauX1irZOAQ==, figureFileBig=pf3BuPeX6fBD3tOIisrPUA==, tableContent=null), ArticleFig(id=1320883675470877536, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=CN, label=图4, caption=RDNs的稳定性

注:A:RDNs不同温度下的粒径随时间的变化;B:4 ℃下RDNs粒径随时间的变化;C:RDNs不同pH下的粒径变化;D:RDNs结构破坏后的粒径变化;图A中,**表示与−80 ℃组相比数据差异显著,P<0.01;图B中,**表示与0 d相比数据差异显著,P<0.01;图C中,*表示与ddH2O组相比数据差异显著,P<0.05;图D中,**表示与空白对照组相比数据差异显著,P<0.01。

, figureFileSmall=VzfDy02OAVHmauX1irZOAQ==, figureFileBig=pf3BuPeX6fBD3tOIisrPUA==, tableContent=null), ArticleFig(id=1320883675533792097, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=EN, label=Fig.5, caption=Antioxidant activity of RDNs, figureFileSmall=n19flsr/n/IexrGn9eYEEg==, figureFileBig=UNLpBkl+bj1VIwkStGbXqQ==, tableContent=null), ArticleFig(id=1320883675600900962, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=CN, label=图5, caption=RDNs 的抗氧化活性

注:A:RDNs对DPPH自由基的清除率;B:RDNs对ABTS+自由基的清除率。

, figureFileSmall=n19flsr/n/IexrGn9eYEEg==, figureFileBig=UNLpBkl+bj1VIwkStGbXqQ==, tableContent=null), ArticleFig(id=1320883675663815524, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=EN, label=Fig.6, caption=Antibacterial activity of RDNs, figureFileSmall=SNaqGzclD6bL7PbZrMahSA==, figureFileBig=ubAPLParJfyg3ZqEmv4RGw==, tableContent=null), ArticleFig(id=1320883675722535781, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=CN, label=图6, caption=RDNs抗菌活性

注:A:RDNs平板抑菌实验;B:RDNs体外抗溶血实验;C:RDNs体外抗溶血实验溶血率;**表示与空白对照组相比,P<0.01;##表示与S. aureus-EVs组相比,P<0.01,ns表示无显著差异。

, figureFileSmall=SNaqGzclD6bL7PbZrMahSA==, figureFileBig=ubAPLParJfyg3ZqEmv4RGw==, tableContent=null), ArticleFig(id=1320883675781256038, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=EN, label=Table 1, caption=

Dosage of reagents added to the experiment for inhibition of α-glucosidase by RDNs

, figureFileSmall=null, figureFileBig=null, tableContent=
组别药物反应组药物对照组空白反应组空白对照组
RDNs/阿卡波糖(μL)4040−−
蒸馏水(μL)−4040
酶液(μL)40−40−
缓冲液(μL)−40−40
PNPG(μL)60606060
Na2CO3溶液(μL)60606060
), ArticleFig(id=1320883675856753511, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=CN, label=表1, caption=

RDNs对α-葡萄糖苷酶的抑制作用实验试剂添加量

, figureFileSmall=null, figureFileBig=null, tableContent=
组别药物反应组药物对照组空白反应组空白对照组
RDNs/阿卡波糖(μL)4040−−
蒸馏水(μL)−4040
酶液(μL)40−40−
缓冲液(μL)−40−40
PNPG(μL)60606060
Na2CO3溶液(μL)60606060
), ArticleFig(id=1320883675940639592, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=EN, label=Table 2, caption=

Dosage of reagents added to the experiment for inhibition of α-amylase by RDNs

, figureFileSmall=null, figureFileBig=null, tableContent=
组别药物反应组药物对照组空白反应组空白对照组
RDNs/阿卡波糖(μL)100100−−
蒸馏水(μL)−−100100
酶液(μL)300−300−
缓冲液(μL)−300−300
1%淀粉(μL)400400400400
DNS液(μL)200200200200
), ArticleFig(id=1320883676011942761, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=CN, label=表2, caption=

RDNs对α-淀粉酶的抑制作用实验试剂添加量

, figureFileSmall=null, figureFileBig=null, tableContent=
组别药物反应组药物对照组空白反应组空白对照组
RDNs/阿卡波糖(μL)100100−−
蒸馏水(μL)−−100100
酶液(μL)300−300−
缓冲液(μL)−300−300
1%淀粉(μL)400400400400
DNS液(μL)200200200200
), ArticleFig(id=1320883676079051627, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=EN, label=Table 3, caption=

Dosage of additives for in vitro anti-hemolysis experiment of RDNs

, figureFileSmall=null, figureFileBig=null, tableContent=
项目空白
对照组
阳性
对照组
S. aureus-EVs组RDNs组RDNs+S. aureus-EVs组
2%红细胞溶液(μL)360360360360360
PBS(μL)360−30060−
H2O(μL)−360−−−
S.aureus-EVs(μL)−−60−60
RDNs(μL)−−−300300
), ArticleFig(id=1320883676171326316, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=CN, label=表3, caption=

RDNs体外抗溶血实验试剂添加量

, figureFileSmall=null, figureFileBig=null, tableContent=
项目空白
对照组
阳性
对照组
S. aureus-EVs组RDNs组RDNs+S. aureus-EVs组
2%红细胞溶液(μL)360360360360360
PBS(μL)360−30060−
H2O(μL)−360−−−
S.aureus-EVs(μL)−−60−60
RDNs(μL)−−−300300
), ArticleFig(id=1320883676234240877, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=EN, label=Table 4, caption=

Inhibitory effects of RDNs on α-glucosidase and α-amylase

, figureFileSmall=null, figureFileBig=null, tableContent=
组别对α-葡萄糖苷酶的
抑制作用(%)
对α-淀粉酶的
抑制作用(%)
阿卡波糖组99.91±0.0194.12±9.95
RDNs组48.37±1.54**21.32±9.36**
), ArticleFig(id=1320883676292961134, tenantId=1146029695717560320, journalId=1260987677001138203, articleId=1320883666692199191, language=CN, label=表4, caption=

RDNs对α-葡萄糖苷酶和α-淀粉酶的抑制作用

, figureFileSmall=null, figureFileBig=null, tableContent=
组别对α-葡萄糖苷酶的
抑制作用(%)
对α-淀粉酶的
抑制作用(%)
阿卡波糖组99.91±0.0194.12±9.95
RDNs组48.37±1.54**21.32±9.36**
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刺梨纳米囊泡的制备、表征及其抗氧化、降血糖与抗毒溶血活性研究
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曹明未 1 , 庞玉新 1, * , 魏永耀 2 , 王甜甜 1 , 邓芳雪 1 , 刘炳楠 1 , 刘畅 1, *
食品工业科技 | 研究与探讨 2026,47(8): 153-161
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食品工业科技 |研究与探讨 2026 , 47 (8) : 153 -161
刺梨纳米囊泡的制备、表征及其抗氧化、降血糖与抗毒溶血活性研究
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曹明未1 , 庞玉新1, * , 魏永耀2, 王甜甜1, 邓芳雪1, 刘炳楠1, 刘畅1, *
作者信息
  • 1贵州中医药大学药学院,贵州贵阳 550025
  • 2广东药科大学药学院,广东广州 510006
通讯作者:
庞玉新(1975−),男,博士,教授,研究方向:中药民族药开发研究,E-mail:。
刘畅(1988−),女,博士,副教授,研究方向:中药民族药开发研究,E-mail:。
作者简介:

曹明未(2000−),女,硕士研究生,研究方向:中药民族药开发研究,E-mail:

Preparation, Characterization of Rosa roxburghii Tratt. Nanovesicles and Its Antioxidant, Hypoglycemic, and Antihemolytic Activities
Mingwei CAO1 , Yuxin PANG1, * , Yongyao WEI2, Tiantian WANG1, Fangxue DENG1, Bingnan LIU1, Chang LIU1, *
Affiliations
  • 1School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
  • 2School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China
出版时间: 2026-04-15 doi: 10.13386/j.issn1002-0306.2025040349
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为深入研究刺梨来源纳米囊泡(Rosa roxburghii Tratt.-derived nanovesicles,RDNs)的结构特征及其活性,对其进行分离提取及表征,并探究其抗氧化、降血糖及抗金黄色葡萄球菌(Staphylococcus aureus,S. aureus)外毒素溶血活性。采用超速差速离心法提取RDNs,通过透射电镜(TEM)观察形态,结合BCA法、薄层色谱法和RNA提取等方法分别检测蛋白质、脂质和RNA的成分及浓度。利用DPPH和ABTS+自由基清除体系评估抗氧化能力,检测RDNs对α-葡萄糖苷酶和α-淀粉酶的抑制能力以评估降血糖活性,以2%大鼠红细胞为研究对象,将实验分为空白对照组、阳性对照组、S. aureus-EVs(S. aureus-derived extracellular vesicles)组、RDNs组和RDNs+S. aureus-EVs组,检测RDNs的体外抗溶血率。结果表明,RDNs平均粒径为155.27±1.39 nm,Zeta电位为−8.60±0.64 mV,−80 ℃保存12 d稳定,4 ℃保存6 d以内稳定,超过6 d则粒径显著变化(P<0.01),pH为1.2时粒径无显著变化(P>0.05),pH为6.5时粒径变化显著(P<0.05);RDNs含蛋白质(5.50±0.00 mg/mL)、脂质(4.23±0.40 mg/mL)和RNA(3.91±1.97 μg/mL),蛋白分布于24、50~70、70 kDa,脂质类成分复杂,其中含有植物甾醇类和卵磷脂类。在0~212.30 mg/mL范围内,RDNs对DPPH、ABTS+自由基的清除效果与浓度呈正相关,且其对两种自由基的半抑制浓度(IC50)分别为112.90和64.38 mg/mL,此外,当浓度为212.30 mg/mL时,RDNs对ABTS+自由基的清除率可达99.80%;对α-葡萄糖苷酶和α-淀粉酶的抑制率分别为48%和21%,但其活性显著低于阳性药组(P<0.01);RDNs组溶血率趋近于0,S. aureus-EVs组溶血率为64%,RDNs+S. aureus-EVs组溶血率为8%,显著低于S. aureus-EVs组(P<0.01)。刺梨纳米囊泡具有抗氧化、降血糖活性且能发挥抗S. aureus外毒素溶血的作用,为其在抗氧化领域和天然抗菌剂领域的潜在应用奠定了基础。

刺梨  /  纳米囊泡  /  生物活性  /  金黄色葡萄球菌  /  外毒素

To deeply investigate the structural characteristics and activities of nanovesicles derived from Rosa roxburghii Tratt. (RDNs), they were isolated, extracted, and characterized. Additionally, their antioxidant, hypoglycemic, and anti-hemolytic activities against Staphylococcus aureus exotoxin were explored. The RDNs were isolated using ultracentrifugation, and their morphology was characterized through transmission electron microscopy (TEM). The protein, lipid, and RNA composition/concentrations were quantified employing the BCA assay, thin-layer chromatography (TLC), and RNA extraction kits, respectively. The antioxidant capacity was assessed using DPPH and ABTS+ radical scavenging assays, while the hypoglycemic activity was evaluated through α-glucosidase and α-amylase inhibition assays. Using 2% rat erythrocytes as the research object, the experiment was divided into blank control group, positive control group, S. aureus-EVs group, RDNs group, and RDNs+S. aureus-EVs group, and in vitro anti-hemolytic rate of RDNs was detected. The results indicated that RDNs had an average hydrodynamic diameter of 155.27±1.39 nm, a Zeta potential of −8.60±0.64 mV, and maintained stability at −80 ℃ for 12 days. The particles remained stable during the first 6 days of storage at 4 ℃, but exhibited significant particle size changes after surpassing the 6-day mark (P<0.01). Particle size remained unchanged (P>0.05) at pH1.2, while pH6.5 showed significant change in particle size (P<0.05). Biochemical analysis uncovered the presence of protein (5.50±0.00 mg/mL), lipid (4.23±0.40 mg/mL), and RNA (3.91±1.97 μg/mL). Notably, protein bands were observed at 24, 50~70, and 70 kDa. Lipid components exhibited an intricate composition, which included phytosterols and lecithins. Concentration-dependent (0~212.30 mg/mL) scavenging of DPPH and ABTS+ radicals was observed, with the half-inhibitory concentrations (IC50) for the two radicals being 112.90 and 64.38 mg/mL, respectively. Additionally, when the concentration reached 212.30 mg/mL, the RDNs were capable of eliminating 99.80% of ABTS+. The α-glucosidase and α-amylase inhibition rates were 48% and 21%, respectively, significantly lower than positive controls (P<0.01). The hemolysis rates were nearly 0 in the RDNs group, 64% in the S. aureus-EVs group, and 8% in the RDNs+S. aureus-EVs group, which was significantly lower than that in the S. aureus-EVs group (P<0.01). The RDNs had antioxidant and hypoglycemic activities and could exert anti-hemolytic effects against S. aureus exotoxins, laying a foundation for their potential applications in the fields of antioxidants and natural antibacterial agents.

Rosa roxburghii Tratt.  /  nanovesicles  /  bioactivity  /  Staphylococcus aureus  /  exotoxin
曹明未, 庞玉新, 魏永耀, 王甜甜, 邓芳雪, 刘炳楠, 刘畅. 刺梨纳米囊泡的制备、表征及其抗氧化、降血糖与抗毒溶血活性研究. 食品工业科技, 2026 , 47 (8) : 153 -161 . DOI: 10.13386/j.issn1002-0306.2025040349
Mingwei CAO, Yuxin PANG, Yongyao WEI, Tiantian WANG, Fangxue DENG, Bingnan LIU, Chang LIU. Preparation, Characterization of Rosa roxburghii Tratt. Nanovesicles and Its Antioxidant, Hypoglycemic, and Antihemolytic Activities[J]. Science and Technology of Food Industry, 2026 , 47 (8) : 153 -161 . DOI: 10.13386/j.issn1002-0306.2025040349
植物来源纳米囊泡(plant-derived nanovesicles,PDEVs)是植物向胞外分泌的30~1000 nm膜性囊泡,具有多组分、多功能、生物安全性高、易被生物体吸收等特点[1]。其中中草药植物来源的纳米囊泡(Chinese herbal medicine-derived nanovesicles,CHMDNs)粒径为30~400 nm,组成成分多为脂质、蛋白质、核酸等活性分子[2−3],在植物各生理活动中起到关键作用。研究表明,CHMDNs蕴含中草药的绝大部分活性成分,具有与原植物相似的抗炎、抗癌、抗氧化等活性[4−6]。随着CHMDNs的分离鉴定技术及功能研究持续深入,其在医学领域的应用潜力正逐步显现。金黄色葡萄球菌(Staphylococcus aureus,S. aureus)是临床常见的革兰氏阳性致病菌,其分泌的由囊泡包裹的外毒素,可通过直接破坏宿主细胞或干扰免疫应答加剧感染进程,其中α-溶血素(α-hemolysin,Hla)是引发溶血效应及组织损伤的核心毒性蛋白[7−8]。与传统抗毒素策略相比,CHMDNs可避免化学合成载体的免疫原性风险,其表面丰富的生物活性分子还能协同调节免疫反应,增强毒素中和效率[9]。因此,从中草药中寻找新型的具有可抗金黄色葡萄球菌外毒素活性的CHMDNs是有效途径之一。
刺梨是蔷薇科蔷薇属植物缫丝花(Rosa roxburghii Tratt.)的成熟果实[10],是贵州省极具地域特色的中药及民族药[11]。目前,贵州省刺梨种植面积已达1456平方千米,产量居全国前列,实现了31.61亿元产值[12],产业规模可观。刺梨生长于贵州独特的喀斯特地貌环境,为药食两用重要来源,蕴含着丰富且独特的天然活性成分。研究表明,刺梨具有抗氧化[13]、抗菌[14]等活性,具有成为可抗金黄色葡萄球菌外毒素活性的CHMDNs的潜力。现阶段对新鲜刺梨的研究主要集中于刺梨化学成分鉴定[15]、刺梨白粉病研究[16]与保鲜和贮藏技术[17]等方面。开展新鲜刺梨在纳米囊泡领域的研究,不仅能够从中寻找新型的具有可抗金黄色葡萄球菌外毒素活性的 CHMDNs,且有利于打破CHMDNs现有研究材料在特色地域植物方面的局限性,拓展CHMDNs的现有研究谱系。基于此,本研究以贵州特色药食两用民族药鲜刺梨为研究对象,对其来源纳米囊泡(RDNs)的提取方法和药学性能展开初步探索,重点聚焦于RDNs的稳定性、抗氧化性及抗菌性能,旨在为RDNs的后续深入研究奠定基础,为阐释该中药药效物质基础提供参考依据,进而推动贵州特色药食同源植物的开发利用,助力地区经济发展。
金黄色葡萄球菌(Staphylococcus aureus,S. aureus)(ATCC 25923) 美国典型培养物保藏中心(American Type Culture Collection,ATCC);刺梨 采摘于贵州省贵阳市花溪区党武镇路边寨,经贵州中医药大学刘畅副教授鉴定为蔷薇科蔷薇属植物缫丝花(Rosa roxburghii Tratt.)的成熟果实;磷酸缓冲盐溶液(PBS)(WHB824F098) 武汉普诺赛生命科技有限公司;BCA试剂盒(CR2405090)、Triton X-100(104H051) 武汉塞维尔生物科技有限公司;RNA提取试剂盒(X1024) 天根生化科技有限公司;MH琼脂培养基(240513A30) 广东环凯微生物科技有限公司;LB肉汤(20231025) 上海博微生物科技有限公司;可溶性淀粉(C16246498,纯度>99.0%)、L-抗坏血酸(维生素C)(C16303394,纯度>99.0%)、阿卡波糖水合物(C16594482,纯度为98%)、4-硝基苯基-β-D-吡喃葡萄糖苷(C15134401) 山东科源生化有限公司;1.1-二苯基-2-苦基肼(DPPH)(S04IS224966,纯度为98%)、α-葡萄糖苷酶(S10050,酶活≥50U/mg)、高峰α-淀粉酶(N20IS232564,酶活≥4000U/g) 上海源叶生物科技有限公司;DNS试剂(240007004) 北京索菜宝科技有限公司;无水乙醇(20240608) 分析纯,成都金山化学试剂有限公司。
CNSVC-TAS-WI-LSC102型高速落地离心机、Sorvall Legend Micro 17R型高速冷冻离心机 美国Thermo Fisher Scientific公司;L18-P161型九阳榨汁机 九阳股份有限公司;1530型全波全长酶标仪 美国Thermo Fisher Scientific公司;HH-6型数显恒温水浴锅、LC-HN-25BS型电热恒温培养箱  上海力辰邦西仪器科技有限公司;Zetasizer Lab型马尔文Zetasizer粒径仪 英国马尔文公司;IMS-50型全自动雪花制冰机 常熟市雪科电器有限公司;NanoPhotometer N60 Touch型超微量核酸蛋白测定仪 德国IMPLEN公司;JEM-1400FLASH透射电子显微镜 日本电子株式会社(JEOL); SK8210 HP 型超声波清洗器 上海科导超声仪器有限公司。
参考文献[18−20]方法,选择超速差速离心法提取RDNs,提取全过程保持温度为4 ℃。称取200 g新鲜刺梨洗净榨汁,按照1:1(v/v)加入预冷1×PBS(pH7.4),4000×g低速低温离心1 h去渣,取上清;10000×g中速低温离心1 h去细胞碎片等,取上清;100000×g高速低温离心1.5 h,弃上清,取沉淀;加入适量PBS,100000×g高速低温离心1.5 h,取沉淀,加入1 mL PBS分散重悬即得RDNs(图1)。RDNs得率(%)计算公式为:
$\rm \mathrm{得率}(\text{%})=m_{ \mathrm{1}} \mathrm{/m}_{ \mathrm{2}} \mathrm{\times 100} $
式中,m1为提取物质量,m2为提取所用原料质量。
取 RDNs适量,1×PBS稀释至一定浓度,使用马尔文Zetasizer粒径仪测定平均粒径、多分散系数(poly dispersity index,PDI)及Zeta电位。
取20 μL RDNs,滴于铜网上,静置3 min后室温晾干,扣置于2%磷钨酸溶液内染色2 min,用滤纸吸干多余染液后室温干燥置于透射电镜200 kV电压下成像。
参考刘贵龙[21]的方法并稍作修改,向1.5 mL EP管中加入氯仿:甲醇:RDNs=8:4:3溶液,混匀后10000×g离心10 min,收集最下层脂质,100 ℃烘干,氯仿重悬,采用薄层色谱法检测样品中的脂质,并根据样品点样斑点的迁移距离、展开系统、显色反应特异性及显色斑点面积或亮度与标准品(参照物)点样斑点作对比进行初步定性和定量分析。
参考李思敏等[22]的方法并稍作修改,取RDNs 1 mL,加RIPA裂解液0.5 mL,涡旋,冰上静置15 min,4 ℃、1256.64 rad/s离心15 min,取上清。利用BCA法测定样品中的蛋白质含量(μg/mL)。以牛血清蛋白(BSA)为标准品绘制标准曲线,回归方程为y=0.0477x+0.1172,决定系数R2=0.9979。
SDS-凝胶电泳实验:根据试剂盒说明制备10%凝胶,制胶完成后,取RDNs蛋白质样品5 μL于1.5 mL EP管中,加入1 μL 5×蛋白质上样缓冲液,轻轻盖上盖子混匀,沸水浴10 min,取出,冷却至室温;以每孔5 μL的上样量上样,180 V恒定电压电泳40 min,电泳结束后将胶取出,显影,拍照,根据蛋白质分子量标准判断RDNs蛋白质样品的大小。
采用RNA提取试剂盒对RDNs 的RNA进行提取,使用超微量核酸蛋白测定仪测定RNA含量,−80 ℃冷冻保存。
将RDNs分装后分别置于4和−80 ℃,于第3、6、9、12 d,测定粒径变化。
将RDNs在pH1.2(模拟胃液)和pH6.5(模拟肠液)中孵育30 min,以ddH2O中的RDNs作为对照,测定粒径变化。
利用TritonX-100和超声仪分别对RDNs结构进行化学和物理破坏。取RDNs 1 mL于1.5 mL EP管中,加入TritonX-100 1 μL常温反应30 min,进行化学解构;取RDNs 1 mL于1.5 mL EP管中,超声30 min,进行物理解构。
参考王春霞[23]的方法并稍作修改,避光精密称取0.04 mg DPPH(1-1-二苯基-2-苦基肼),溶于1 mL无水乙醇中,获得浓度为0.04 mg/mL DPPH 溶液,避光保存,备用。吸取浓度为212.30 mg/mL的RDNs样品进行梯度稀释至不同浓度后(212.30、106.15、53.08、26.54、13.27、6.63、3.32、1.66、0.83 mg/mL),各浓度RDNs样品各取20 μL与180 μL DPPH无水乙醇溶液(0.04 mg/mL)混合后加入到96孔板中,同时以相同浓度抗坏血酸(VC)为阳性对照,平行实验3次,室温避光反应30 min,于517 nm波长处测定吸光度(A)值,计算DPPH自由基清除率。
$\rm \mathrm{DPPH自由基清除}率(\text{%})=[1-(A_{ \mathrm{1}}- \mathrm{A}_{ \mathrm{2}} )\mathrm{/A}_{ \mathrm{0}} \mathrm{]\times 100} $
式中,A0为无RDNs(空白对照)时DPPH自由基溶液的吸光度值;A1为DPPH自由基溶液在RDNs存在下的吸光度值;A2为RDNs在无水乙醇溶液中的吸光度值。
参考Yuan等[24]的方法并稍作修改,取5 mL的7.40 mmol/L的ABTS+溶液与88 μL的2.60 mmol/L的K2S2O8溶液混合,避光室温放置12 h后得到ABTS+工作液,加入适量蒸馏水稀释使其在波长734 nm处吸光度为0.70±0.02时,备用。吸取浓度为212.30 mg/mL的RDNs样品进行梯度稀释至不同浓度后(212.30、106.15、53.08、26.54、13.27、6.63、3.32、1.66、0.83 mg/mL),各浓度RDNs样品各取20 μL与180 μL的ABTS+溶液混合后加入到96孔板中,同时以相同浓度抗坏血酸(VC)为阳性对照,平行实验3次,室温避光反应3 h后,于734 nm处测吸光度(A)值,并计算ABTS+自由基清除率。
$ \mathrm{ABTS}^{ \mathrm+} \mathrm{自由基清除率(\text{%})=[1-(A}_{ \mathrm{1}} \mathrm{-A}_{ \mathrm{2}} \mathrm{)/A}_{ \mathrm{0}} \mathrm{]\times 100} $
式中,A0为无RDNs(空白对照)时ABTS+自由基溶液的吸光度值;A1为ABTS+自由基溶液在RDNs存在条件下吸光度值;A2为RDNs在蒸馏水中的吸光度值。
参考王春霞[23]的方法并稍作修改,称取212.30 mg的阿卡波糖溶于1 mL蒸馏水中,备用。准确量取浓度为212.30 mg/mL的RDNs溶液1 mL,并使用0.45 μm微孔滤膜过滤后按照表1添加剂量于96孔板,每组设置3个复孔,先加入缓冲液、RDNs和37 ℃水浴的酶液,于37 ℃反应15 min后取出;加入PNPG溶液,于37 ℃条件反应25 min;最后加入Na2CO3溶液终止反应。以阿卡波糖为阳性对照实验,于405 nm处测定吸光度(A),计算抑制率,平行实验3次。
$ \mathit{\alpha } \text{-}\mathrm{葡萄糖苷酶抑制率(\text{%})=(A}_{ \mathrm{空}} -\mathrm{A}_{ \mathrm{样}} \mathrm{)/A}_{ \mathrm{空}} \mathrm{\times 100} $
式中,A空=A空白反应组−A空白对照组;A样=A药物反应组−A药物对照组。
参考王春霞[23]的方法并稍作修改,称取212.30 mg的阿卡波糖溶于1 mL蒸馏水中,备用。准确量取浓度为212.30 mg/mL的RDNs溶液1 mL,并使用0.45 μm微孔滤膜过滤后按照表2添加剂量添加到1.5 mL EP管中:先加入300 μL α-淀粉酶溶液、100 μL样品溶液(RDNs或阿卡波糖溶液),于37 ℃水浴5 min;再加入400 μL淀粉溶液,混合均匀后于37 ℃水浴5 min;最后加入200 μL DNS试剂,沸水浴5 min后取出,冷却至室温,添加蒸馏水使溶液稀释25倍;混匀加样至96孔板,每孔200 μL,设3个复孔,于540 nm测定吸光度,计算抑制率,平行实验3次。
$ \mathit{\alpha } \text{-}\mathrm{淀粉酶抑制率(\text{%})=(A}_{ \mathrm{空}} -\mathrm{A}_{ \mathrm{样}} \mathrm{)/A}_{ \mathrm{空}} \mathrm{\times 100} $
式中,A空=A空白反应组−A空白对照组;A样=A药物反应组−A药物对照组。
吸取100 μL浓度为1.5×108 CFU/mL菌液加入装有1 mL浓度为212.30 mg/mL的RDNs悬液EP管混匀后,放入37 ℃培养箱中培养24 h,取出观察EP管中溶液状态,并吸取100 μL混合溶液均匀滴于平板上,使用涂布器摊涂均匀,放入37 ℃培养箱中培养24 h,取出观察并拍照记录。
参考Tan等[9]的方法,取制备好的菌液上清过0.45 μm过滤器后,滤液加入100 kDa超滤管中,在4000×g低温条件下过滤30 min,得滤液即为S. aureus-EVs,保存至−80 ℃备用。取5只1.5 mL的EP管,分为5个组,组别分别为空白对照(PBS)组、阳性对照(H2O)组、S. aureus-EVs组、RDNs组、RDNs+S. aureus-EVs组,向每组不同EP管中加入表3所示的溶液后,在37 ℃度下,静置1 h,251.33 rad/s 离心5 min,取上清,加入到96孔板中,每组设置3个复孔,于酶标仪上测波长在540 nm处的吸光度(A)值,并计算溶血率,计算公式为:
$ \mathrm{溶血率(\text{%})=(A}_{ \mathrm{样品}} -\mathrm{A}_{ \mathrm{空白}} \mathrm{)/A}_{ \mathrm{阳性}} $
每个实验均重复3次及以上,数据结果以均值±标准差(x±s)表示,采用SPSS 25.0软件进行统计学分析,组间数据采用单因素方差分析,P<0.05表示显著性差异。
超速差速离心提取得到的RDNs紧贴离心管底管壁,呈黄棕色状(图2A),得率约为0.11%;RDNs粒径分布曲线对称性较好(图2B),平均粒径为155.27±1.39 nm,PDI值为0.08±0.03小于0.30,Zeta电位为−8.60±0.64 mV,说明RDNs粒子分布稳定均一;从TEM图可以观察到RDNs具有明显膜状结构,呈典型的茶托或杯盘状囊泡样,符合植物来源纳米囊泡鉴别特征[25−26]。
实验测得RDNs的脂质、蛋白质、核酸含量分别为5.50±0.00 mg/mL、4.23±0.40、3.91±1.97 μg/mL,RDNs组分中所含有的物质与文献[27]结论一致;RDNs中所含蛋白质在24、50~70、70 kDa均有分布(图3A);采用薄层色谱法(图3B)分析可知,RDNs含多种脂质类成分,其中有植物甾醇类、卵磷脂类。
利用马尔文Zetasizer粒径仪监测RDNs在4和−80 ℃环境存放相同天数的粒径变化。结果表明,在12 d内不同温度对RDNs的影响显著。在−80 ℃条件下,RDNs存放12 d以内的粒径相对稳定(图4A);在4 ℃下,存放6 d内RDNs的粒径无显著变化,6 d后,粒径骤增(P<0.01)(图4B)。
刺梨为药食两用植物,且其通常为口服给药,为了评价RDNs在胃肠液中的稳定性,分析其在胃肠液中发挥药效的作用是否与RDNs有关,分别配制pH1.2和pH6.5的模拟胃液和肠液酸度环境,测定RDNs在两种不同环境下的粒径变化。结果表明,不同pH对RDNs粒径的影响有显著性差异,RDNs的粒径在pH6.5中显著增加(P<0.05),在pH1.2中变化不显著,结果表明RDNs在模拟的肠液酸性环境中,粒径明显变化,这意味着性质极有可能会被改变,而胃液环境对RDNs的影响不显著(图4C)。
对RDNs采用化学和物理两种方法进行结构破坏,通过测定其粒径的变化,判断结构破坏是否对RDNs的粒径有影响。结果显示,经过结构破坏后,超声破坏组RDNs的粒径变化不显著,TritonX-100组的粒径显著变小(P<0.01),表明RDNs的结构更容易受到化学试剂的影响,推测化学试剂的存在对RDNs的性质可能会产生影响(图4D)。
将超速差速离心提取法所提取得到的212.30 mg RDNs重悬于1 mL 1×PBS制成浓度为212.30 mg/mL RDNs悬液,分别测定其DPPH自由基清除率、ABTS+自由基清除率。结果表明,在0~212.30 mg/mL范围内,随着RDNs浓度的增加,其对DPPH自由基和ABTS+自由基的清除率逐渐增强,浓度与清除效果呈正相关,存在一定浓度依赖性,且当浓度为212.30 mg/mL时,RDNs对DPPH自由基与ABTS+自由基的最高清除率分别为58.20%和99.80%(图5A、图5B)。经计算,阳性对照药VC和RDNs对DPPH自由基的IC50值分别为0.38和112.90 mg/mL;阳性对照药VC和RDNs对ABTS+自由基的IC50值分别为和0.021和64.38 mg/mL,表明RDNs的抗氧化活性较好。
测定浓度为212.30 mg/mL的RDNs悬液对α-葡萄糖苷酶和α-淀粉酶的抑制作用。实验结果显示(表4),RDNs对α-葡萄糖苷酶和α-淀粉酶均有抑制作用,但与阳性药组相比,RDNs的抑制作用明显较低,表明RDNs虽表现出一定的降血糖活性,但显著低于阳性药(P<0.01),提示其降血糖活性可能并非主要通过抑制这两种酶实现。
结果表明,RDNs对S. aureus无直接杀灭或者抑制作用(图6A);RDNs体外抗S. aureus-EVs溶血实验结果显示(图6B),与空白组相比,S. aureus-EVs组、阳性组和RDNs+S. aureus-EVs组均出现了不同程度的溶血,RDNs组无溶血现象,S. aureus-EVs组溶血现象显著(P<0.01),RDNs+S. aureus-EVs组有轻微溶血现象;各组溶血率结果显示(图6C),S. aureus-EVs组和RDNs+S. aureus-EVs组具有显著性差异(P<0.01),表明RDNs具有良好的抗溶血能力,因此,可以推测RDNs对S. aureus并无直接抑制作用,而是可以对S. aureus所产生外毒素的溶血作用发挥抑制作用,从而间接达到抗菌的效果。
本研究系统探究了刺梨纳米囊泡(RDNs)的稳定性、抗氧化活性、酶抑制活性及抗金黄色葡萄球菌外毒素溶血作用,结果表明,RDNs稳定性受温度、pH及化学试剂影响明显,在模拟胃液酸性环境下粒径更稳定;其对DPPH、ABTS+自由基清除能力呈显著浓度依赖性,表现出优异的体外抗氧化活性;对α-葡萄糖苷酶和α-淀粉酶的抑制效果弱于阳性药物;对S. aureus无直接抑菌作用,但可显著抑制其外毒素介导的溶血效应,整体证实刺梨纳米囊泡可继承原植物部分活性,且作用机制与原植物存在明显差异。
本研究发现,RDNs稳定性更易受化学试剂影响,物理因素对其结构破坏程度相对较低,与细胞外囊泡的稳定性规律一致[28]。同时,RDNs在模拟胃液中粒径更稳定,提示其口服后可在胃部较好维持结构,但在肠道环境中可能发生结构改变,进而影响体内生物利用度,为后续口服递送与功能开发提供了重要依据。
在活性评价中,RDNs展现出优异的抗氧化能力,在0~212.30 mg/mL范围内清除率随浓度升高而增强,ABTS+自由基清除率最高可达99.80%,显著优于生姜、大蒜、柠檬等多种植物来源纳米囊泡[20],印证了植物纳米囊泡可继承原植物药理活性的结论[29–31]。但RDNs对α-葡萄糖苷酶和α-淀粉酶的抑制效果显著低于阳性药,推测原因主要包括囊泡中活性成分含量与纯度有限、致密膜结构阻碍了有效物质释放、作用靶点与通路不同于阳性抑制剂等[32−36]。后续可通过质谱技术对RDNs进行成分鉴定与定量分析,采用物理或化学手段破碎膜结构以验证物质释放对酶抑制活性的影响,并开展体内实验进一步明确其降糖相关效果。
在抗菌机制研究中,金黄色葡萄球菌可通过释放外毒素引发溶血、炎症等致病效应[37],本研究发现RDNs不直接抑制或杀灭金黄色葡萄球菌,却能显著阻断其外毒素的溶血作用,说明RDNs并非依靠杀菌发挥功效,而是通过中和或干扰外毒素实现保护作用,与刺梨原植物直接抑菌的机制截然不同,推测其可能通过囊泡间特异性结合实现功能调控。相较于传统抗生素易引发耐药性与菌群失衡问题,靶向阻断细菌外毒素的策略更具应用前景[9]。本研究首次报道刺梨纳米囊泡的抗氧化与抗外毒素活性,为药食同源植物纳米囊泡的功能挖掘提供了新依据。但研究仍存在不足,RDNs的关键活性成分、作用靶点、体内代谢途径及酶抑制活性提升策略仍需深入探索,相关体内药效与安全性评价也有待完善。
本研究对新鲜刺梨进行超速差速离心提取并制备得RDNs。RDNs平均粒径为155.27±1.39 nm,呈典型双层膜囊泡样结构,最佳存放条件为−80 ℃中性环境中12 d以内;在模拟的肠液酸度环境下粒径会显著变化,在模拟的胃液酸度环境下粒径无显著差异;RDNs的结构对物理破坏的承受力显著强于化学破坏;同时 RDNs 具有显著的抗氧化活性,且在一定浓度范围内,存在明显剂量依赖性,但其降血糖活性不显著,推测可能与其成分特性、作用机制以及环境适应性等多方面因素相关,后续可进行更深入探讨;RDNs对S. aureus无直接抑制作用,而是可以对S. aureus的外毒素产生抑制作用,从而间接对S. aureu产生抑制作用。综上所述,本研究从刺梨中成功提取并制备RDNs并初步证实其具有显著抗氧化和抗S. aureus溶血的作用,丰富了对药食两用民族药刺梨的认识,拓展了CHMDNs现有研究谱系,同时为天然抗菌剂的研发提供了参考依据。

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2026年第47卷第8期
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doi: 10.13386/j.issn1002-0306.2025040349
  • 接收时间:2025-04-27
  • 首发时间:2026-10-24
  • 出版时间:2026-04-15
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  • 收稿日期:2025-04-27
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    1贵州中医药大学药学院,贵州贵阳 550025
    2广东药科大学药学院,广东广州 510006

通讯作者:

庞玉新(1975−),男,博士,教授,研究方向:中药民族药开发研究,E-mail:。
刘畅(1988−),女,博士,副教授,研究方向:中药民族药开发研究,E-mail:。
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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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