CN116120475B - 一种云莓均一多糖rcp-90-1及其分离纯化方法和作为抗肿瘤药物的应用 - Google Patents
一种云莓均一多糖rcp-90-1及其分离纯化方法和作为抗肿瘤药物的应用 Download PDFInfo
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Abstract
云莓均一多糖RCP‑90‑1及其分离纯化方法和作为抗肿瘤药物的应用,它涉及均一多糖及其分离纯化方法和应用,它是要提供新型云莓均一多糖RCP‑90‑1及其制法和应用,本发明的RCP‑90‑1是由阿拉伯糖、葡萄糖、半乳糖、木糖、核糖与甘露糖构成的多糖。制法为:采用含乙醇的蒸馏水闪式提取法提取云莓粗多糖,再脱蛋白、脱色,用90%乙醇醇沉后,再采用DEAE‑52纤维素柱层析用0.3mol/L的NaCl溶液洗脱,最后用Sephadex G‑100柱层析纯化,获得RCP‑90‑1;该均一多糖通过诱导线粒体凋亡和调控PI3K‑Akt信号通路来抑制人肝癌HepG‑2细胞的生长活性,可用于人肝癌的治疗领域。
Description
技术领域
本发明涉及一种云莓均一多糖的分离纯化方法及其应用,属于多糖的分离纯化方法及其应用领域。
背景技术
植物多糖是生物体代谢过程中产生的由许多相同或不同的单糖以α-或β-糖苷键组成的生物大分子化合物,普遍存在于自然界植物体中,包括淀粉、纤维素、多聚糖、果胶等。研究表明,植物多糖具有显著的抗肿瘤、抗氧化、增强免疫力、降血糖、降血脂、抗辐射等生理活性。植物多糖作为一种潜在的抗肿瘤先导化合物,具有安全、高效、无毒等特点,对多糖结构和功能的研究已成为多糖研究领域的重点和热点,也为开发多糖类新药和保健品提供一定的科学依据,具有较高的研究意义和应用价值。
云莓(Rubus chamaemorus或Cloudberries)属于蔷薇科、悬钩子属多年生草本植物,又名沼泽金莓、矮桑悬钩子、兴安悬钩子、鲑莓、黄莓等。云莓高10-25cm,叶子有褶皱,雌雄异株,雄株只开花不结果;生长在阴凉处,喜欢潮湿、酸性(pH3.5~5)和排水良好的土壤,极度耐寒(-40℃以下),分布于中国东北、俄罗斯、北欧、北美。云莓的果实可食用,成熟的浆果金黄色,色泽宜人、柔软多汁,不仅可以生吃,也被用来制作蜜饯、果酱及甜酒。云莓也是一种药食同源植物,富含维生素C、维生素E、多糖、多酚(鞣花丹宁、花青素)、黄酮类、鞣花酸、膳食纤维、脂肪酸、微量元素等多种活性物质,具有极高的食用和药用价值,对于云莓中有效成分的开发研究具有广阔的市场应用前景。
目前关于云莓多糖的研究报道较少,特别是对云莓多糖的分离纯化、结构鉴定及其应用方面的研究目前尚处于空白阶段。仅有少数几篇类似多糖的相关报道,例如:徐丽萍等在2017年《中国食品添加剂》第9期第187页《响应曲面法优化红树莓多糖提取工艺》中采用响应曲面法对红树莓多糖提取工艺条件进行优化,在料液比为1∶20、温度71℃、时间59min的条件下多糖提取率仅达到10.69%。吴媛媛在2018年其硕士论文《红树莓多糖分离纯化及降血糖作用研究初探》第33-34页中采用复合酶法提取红树莓多糖,响应曲面法优化最佳工艺条件为:复合酶(果胶酶和纤维素酶)配比为1:2、pH4.0、料液比1:30(g/mL)、酶添加量1.5%、酶解温度30℃、酶解时间25min,在此条件下红树莓粗多糖的得率为4.82%。采用DEAE-Sepharose离子交换柱层析和Sephadex G-100葡聚糖凝胶柱层析对红树莓多糖进行分离纯化。用蒸馏水和不同浓度NaCl溶液进行梯度洗脱,得到单一峰,命名为RRP-I。高效液相凝胶色谱法(HPLC)和气相色谱法(GC)对RRP-I的分子量和单糖组成进行测定,RRP-I分子量为11220Da,是由葡萄糖组成的均一多糖,且RRP-I具有一定的降血脂活性。此外,滕歆在2014年其硕士论文《树莓果实多糖的提取纯化、结构鉴定及生物活性的研究》第31-37页中采用复合酶法提取树莓多糖。确定最佳反应条件:复合酶(果胶酶:纤维素酶:木瓜蛋白酶=2.5:1.7:2.1)用量2.6%、pH4、温度55℃、提取时间2.6h,树莓多糖的得率达到4.09%。RCP通过Sephadex G-100柱纯化,去离子水洗脱后得到2个组分,RCP I、RCPⅡ。其中多糖含量较高的组分RCPⅡ分子量为3.9x103Da。RCPⅡ由鼠李糖、阿拉伯糖、木糖、葡萄糖和半乳糖组成,其物质量比为1:2.07:0.72:0.85:3.54。红外光谱分析表明RCPⅡ是一种含有乙酰基或糖醛酸的呋喃糖环多糖,且RCPⅡ对DPPH具有非常明显的清除作用。有鉴于此,对云莓中的活性成分特别是对新型、高效低毒抗肿瘤活性多糖的研究与开发具有重要的意义,可能成为新药研发的候选目标之一。
发明内容
本发明是要提供云莓均一多糖RCP-90-1及其分离纯化方法和作为抗肿瘤药物的应用,本发明采用含5%乙醇的蒸馏水闪式提取法从云莓中提取粗多糖,并进行脱蛋白、脱色处理,并采用不同浓度的乙醇分级醇沉,并对90%乙醇醇沉的云莓多糖RCP-90进一步采用DEAE-52纤维素柱层析和Sephadex G-100柱层析进行纯化获得3种云莓均一多糖,其中0.3mol/L的NaCl洗脱得到的即为云莓多糖RCP-90-1;并对云莓多糖RCP-90-1的化学结构进行表征,通过测试云莓多糖RCP-90-1的抗肝癌活性及作用机制,证明云莓多糖的化学结构和抗肿瘤活性之间的构效关系,为临床上抗肝癌药物的研发提供新的理论依据。
本发明的云莓均一多糖RCP-90-1是由阿拉伯糖(Ara)、葡萄糖(Glc)、半乳糖(Gal)、木糖(Xyl)、核糖(Rib)与甘露糖(Man)按摩尔比为0.63:4.17:1.0:0.62:0.45:0.17构成的多糖。
上述的云莓均一多糖RCP-90-1的分离纯化方法,按以下步骤进行:
(1)云莓的粉碎、脱脂:将干净的云莓果干粉碎过40目筛,获得云莓粉末,用石油醚回流提取,除去其中的脂溶性物质,得到云莓果渣;
(2)云莓多糖的提取:将云莓果渣与含有4%~6%乙醇的蒸馏水按料液比1:(18~22)的比例混合进行闪式提取,设置提取电压180~220V,提取温度80~90℃,提取时间80~100s,反复提取2次,过滤后合并提取液;本步骤设置提取液中含4%~6%的乙醇,用来提高细胞的渗透性,有利于细胞内多糖的溶出,但乙醇浓度过高则降低多糖的溶解性;
(3)云莓粗多糖的浓缩:将提取液冷却、浓缩,获得浓缩液;再将无水乙醇加入到浓缩液中,4℃条件下醇沉12h~15h,离心分离、浓缩、真空干燥,获得云莓粗多糖;
(4)云莓粗多糖的脱蛋白处理:采用蛋白酶法和Sevag法联合对云莓粗多糖进行脱蛋白处理,具体操作为:配制云莓粗多糖水溶液,然后加入木瓜蛋白酶,在温度为54~56℃、pH为6的条件下水浴酶解1~1.5h,再沸水浴灭活,离心去除沉淀;然后在上清液中加入Sevag试剂,振荡15~30min,再静置1~1.5h,离心分离,弃去固相物,即变性蛋白,重复2次,取上清液浓缩,干燥,得到固体粉状脱蛋白的云莓多糖;
(5)云莓粗多糖的脱色处理:配制脱蛋白的云莓多糖溶液,调节pH值至8.0,加入2.5%~3%的H2O2溶液脱色,脱色温度为40℃~45℃,脱色时间为1h~1.5h,获得脱色的云莓多糖;本步骤中,H2O2的浓度和脱色时间要严格控制,浓度过高,时间过长容易导致氧化脱色,进而引起部分多糖的降解;
(6)除小分子杂质:将脱蛋白、脱色后的云莓多糖置于透析袋中流水透析24h~48h,蒸馏水透析24h~48h,真空干燥,获得纯云莓多糖;
(7)云莓多糖的醇沉:将纯云莓多糖配制成水溶液,向纯云莓多糖溶液中加入质量百分浓度为90%的乙醇进行醇沉,醇沉时的温度控制在4~5℃,醇沉6~7h,然后离心,浓缩、冷冻真空干燥,得到云莓精多糖RCP-90;
(8)云莓多糖的纯化:将云莓精多糖RCP-90配制成水溶液,离心、过滤,然后将上清液加入到预平衡好的DEAE-52纤维柱中,采用浓度为0.3mol/L的NaCl溶液进行洗脱,洗脱剂流速为1mL/min,收集洗脱液,每管2mL,采用蒽酮-硫酸法对洗脱液进行跟踪检测,收集洗脱峰液体;再加入到Sephadex G-100色谱柱中进一步分离纯化,采用蒸馏水进行洗脱,控制流速为1mL/min,采用蒽酮-硫酸法对层析液进行跟踪检测,收集单一洗脱峰液体;再用蒸馏水透析24h~48h,浓缩、真空冷冻干燥,获得云莓均一多糖RCP-90-1。
更进一步地,步骤(1)中所述的过筛为过40目筛;
更进一步地,步骤(1)中所述的用石油醚回流提取的次数为2次,每次提取2h;
更进一步地,步骤(3)中所述的离心分离是在转速为3000~4000rpm离心分离10~15min;
更进一步地,步骤(4)中所述的Sevag试剂为氯仿:正丁醇按体积比为5:1的混合溶液;
更进一步地,步骤(4)中,云莓粗多糖的脱蛋白处理中,木瓜蛋白酶溶液的加入量是按每克云莓粗多糖加入1000U/mL的木瓜蛋白酶溶液2~3mL;
更进一步地,步骤(4)中所述的离心分离是在转速为3000~4000rpm离心分离10~15min;
更进一步地,步骤(4)中所述的干燥是在温度为40℃的烘箱中干燥1~2小时。
本发明的分离提纯方法在步骤(3)中获得的云莓粗多糖的质量得率为17.72%,提取率较高;步骤(7)中用90%乙醇醇沉获得的RCP-90组分的总糖含量高达89.3%,步骤(8)中进一步纯化后得到的云莓多糖RCP-90-1的质量得率为8.91%。本发明获得的云莓均一多糖RCP-90-1为高附加值云莓多糖的开发和利用奠定一定的理论基础。
上述的云莓均一多糖RCP-90-1的应用,是将云莓均一多糖RCP-90-1作为治疗肝癌的抗肿瘤药物的应用。
本发明获得云莓均一多糖RCP-90-1通过诱导细胞凋亡和细胞周期阻滞发挥抗肿瘤活性,对人肝癌HepG-2细胞具有显著的抑制作用。云莓均一多糖RCP-90-1对人肝癌HepG-2细胞的生长抑制作用显著优于RCP-90-0和RCP-90-2(P<0.05或P<0.01),其中RCP-90-0、RCP-90-1、RCP-90-2对HepG-2细胞作用72h的IC50值分别为477.34mg/L、23.12mg/L、84.23mg/L。此外,RCP-90-1可显著上调肝癌HepG-2细胞中凋亡相关蛋白Bax、Bad、caspase-3、caspase-9的表达,下调Bcl-2和细胞周期蛋白Cdk2、CyclinA的表达;RCP-90-1还通过调控PI3K-Akt信号通路发挥抗肝癌作用,表现为细胞中PI3K、p-PI3K、Akt、p-Akt蛋白的表达量也显著降低。本发明的云莓均一多糖RCP-90-1可作为新型的抗肿瘤药物,用于临床上肝癌的治疗。
附图说明
图1为实施例1获得的云莓均一多糖的DEAE-52柱层析洗脱峰图;
图2为实施例1获得的云莓均一多糖RCP-90-1的紫外光谱图;
图3为实施例1获得的云莓均一多糖RCP-90-1的红外光谱图;
图4为实施例1获得的云莓均一多糖RCP-90-1的扫描电镜图;
图5为实施例1获得的云莓均一多糖RCP-90-1的1H-NMR谱图;
图6为实施例1获得的云莓均一多糖RCP-90-1的13C-NMR谱图;
图7为云莓均一多糖RCP-90对人肝癌HepG-2细胞生长抑制图;
图8为云莓均一多糖RCP-90-1对人肝癌HepG-2细胞周期及凋亡的流式细胞图;
图9为云莓均一多糖RCP-90-1对人肝癌HepG-2细胞中相关蛋白的影响图。
具体实施方式
用下面的实施例验证本发明的有益效果。
实施例1:本实施例的云莓均一多糖RCP-90-1的分离纯化方法,具体按以下步骤进行:
(1)云莓的粉碎、脱脂:将干净的云莓果干粉碎过40目筛,获得云莓粗粉,石油醚回流提取2次,每次2h,除去其中的脂溶性物质,得到云莓果渣;
(2)云莓多糖的提取:将云莓果渣与含有5%乙醇的蒸馏水按料液比1:20的比例混合进行闪式提取,设置提取电压200V,提取温度85℃,提取时间90,反复提取2次,过滤后合并提取液;
(3)云莓粗多糖的浓缩:将提取液冷却、浓缩,获得浓缩液;无水乙醇加入到浓缩液中,4℃条件下醇沉15h,3500rpm离心10min、浓缩、真空干燥,获得云莓粗多糖;经过计算,云莓粗多糖的含量为72.44%,得率为17.72%,得率较高;
(4)云莓粗多糖的脱蛋白处理:采用蛋白酶法和Sevag法联合对云莓粗多糖进行脱蛋白处理,具体操作为:配制100mL浓度为10mg/mL的云莓粗多糖水溶液,然后加入1000U/mL的木瓜蛋白酶3mL,55℃,pH为6的条件下水浴酶解1h,沸水浴灭活10min,离心去除沉淀;然后在上清液中加入25mL的Sevag试剂,其中Sevag试剂为氯仿与正丁醇按体积比为5:1的混合溶液,振荡20min,再静置1h,3500rpm下离心15min,弃去固相物,即变性蛋白,重复2次,取上清液浓缩,置于40℃的烘箱中干燥,得到固体粉状脱蛋白的云莓多糖;
(5)云莓粗多糖的脱色处理:配制50mg/mL脱蛋白的云莓多糖溶液,调节pH值至8.0,加入3%的H2O2溶液脱色,脱色温度为45℃,脱色时间为1h,获得脱色的云莓多糖;
(6)除小分子杂质:将脱蛋白、脱色后的云莓多糖置于透析袋中流水透析24h,蒸馏水透析24h,真空干燥获得纯云莓多糖;
(7)云莓多糖的分级醇沉:配制50mg/mL的纯云莓多糖水溶液,向纯云莓多糖溶液中依次加入质量百分浓度分别为30%、50%、70%、90%的乙醇进行不同浓度乙醇分级醇沉,4℃下每次醇沉6h,3500rpm离心15min,浓缩、冷冻真空干燥,得到各分级云莓精多糖;分级醇沉后得到4组多糖组分,依次记为RCP-30、RCP-50、RCP-70和RCP-90,其中利用质量百分浓度为90%的乙醇醇沉得到的RCP-90中总糖含量最高,达到89.3%,如表1所示。
表1乙醇分级沉淀检测结果
(8)云莓多糖的纯化:将云莓精多糖RCP-90配制成水溶液,离心、过滤,然后将上清液加入到预平衡好的DEAE-52纤维柱中,分别采用浓度为0、0.3、0.6mol/L的NaCl溶液进行梯度洗脱,洗脱剂流速1mL/min,收集洗脱液,每管2mL,采用蒽酮-硫酸法对洗脱液进行跟踪检测,收集洗脱峰液体;再加入到Sephadex G-100色谱柱中进一步分离纯化,采用蒸馏水进行洗脱,控制流速为1mL/min,采用蒽酮-硫酸法对层析液进行跟踪检测,收集单一洗脱峰液体;再用蒸馏水透析24h,浓缩、真空冷冻干燥,获得3种云莓均一多糖。云莓均一多糖的DEAE-52柱层析洗脱峰图如图1所示,图1显示0、0.3mol/L和0.5mol/L的NaCl洗脱分别得到云莓多糖RCP-90-0、RCP-90-1和RCP-90-2。
本实施例1中提取的云莓粗多糖含量为72.44%,得率为17.72%,90%乙醇醇沉获得的RCP-90组分总糖含量最高,达到89.3%,进一步纯化后得到的云莓均一多糖RCP-90-1的得率最高(267.29mg,8.91%),显著高于RCP-90-0(118.64mg,3.95%)和RCP-90-2(145.58mg,4.37%)(P<0.01)。
实施例2:本实施例对实施例1提取的云莓均一多糖RCP-90的结构进行鉴定,如下。
1.分子量测定:制备2.0mg/mL样品溶液,5000rpm离心10min,0.22μm滤膜过滤收集样品。采用液相色谱法测定各均一多糖组分的分子量,流动相为超纯水,流速为1mL/min,压力为1.4MPa,进样量为20μL,采用Astra软件计算多糖的分子量。
经计算,RCP-90-0、RCP-90-1和RCP-90-2的分子量分别为2.09kDa、3.75kDa和2.87kDa。
2.单糖组成:分别取3种云莓均一多糖RCP-90-0、RCP-90-1和RCP-90-2各10mg,分别在90℃下溶解于2mL的3.0mol/L三氟乙酸中酸水解6h,然后进行气相色谱分析,起始温度为140℃,进样温度为250℃,载气为氦气(He),流速为1mL/min。经本实施例获得的3种云莓均一多糖的单糖组成及摩尔比如表2所示:其中云莓均一多糖RCP-90-1是由阿拉伯糖、葡萄糖、半乳糖、木糖、核糖与甘露糖按摩尔比为0.63:4.17:1.0:0.62:0.45:0.17组成。
表2实施例1获得的3种云莓均一多糖的单糖组成及摩尔比
3.紫外光谱分析:用云莓均一多糖RCP-90-1配制成浓度为0.5mg/mL的水溶液,用紫外分光光度计对多糖溶液进行扫描,扫描200~400nm的波长范围。云莓均一多糖RCP-90-1的紫外光谱图如图2所示。由图可知,云莓均一多糖RCP-90-1在206nm处具有多糖特征吸收峰,证明RCP-90-1是一种多糖类物质;在260nm和280nm两个波长处均无吸收峰,说明云莓均一多糖RCP-90-1中不含有游离的核酸和蛋白质。
4.红外光谱分析:取2.0mg云莓均一多糖RCP-90-1样品与KBr粉末混合压片,在4000~400cm-1范围内进行红外光谱扫描,对云莓多糖的主要官能团进行鉴定。云莓均一多糖RCP-90-1的红外光谱图如图3所示。由图3可知,云莓均一多糖RCP-90-1在3420.78cm-1处有羟基O-H的伸缩振动峰,2924.56cm-1附近的吸收峰为C-H伸缩振动峰,1648.66cm-1处有羰基C-O伸缩振动峰,表明RCP-90-1是一种多糖水合物,1467.78cm-1附近的吸收峰与C-H的弯曲振动有关,1078.29cm-1处的吸收峰表明RCP-90-1中存在吡喃糖,813.54cm-1处的吸收峰为β-糖苷键的特征峰,红外光谱表明RCP-90-1是一种β-吡喃糖。
5.扫描电镜分析:将云莓均一多糖RCP-90-1粉末均匀附着于样品台上,采用扫描电镜观察多糖表面形态。云莓均一多糖RCP-90-1的扫描电镜图如图4所示;由图可知,云莓均一多糖RCP-90-1呈片状结构,表面不规整,常沿边缘折叠,结构紧密,说明分子间作用力较强。
6.核磁共振光谱分析:将20mg云莓均一多糖RCP-90-1溶于D2O中,采用核磁共振波谱仪上机检测,1H-NMR和13C-NMR光谱分析多糖的结构特征。云莓均一多糖RCP-90-1的1H-NMR谱图如图5所示,由图可知,在1H-NMR谱中,端基区出现的糖基信号化学位移均小于5ppm,表明云莓多糖中存在β-型糖苷键。云莓均一多糖RCP-90-1的13C-NMR谱图如图6所示。由图可知,在13C-NMR谱中有多个信号峰,分别为C1~C6信号,结合红外光谱分析,RCP-90-1主要由阿拉伯糖、葡萄糖、半乳糖、木糖、核糖、甘露糖组成的β-吡喃糖。
实施例3:本实施例对实施例1提取的云莓均一多糖RCP-90进行抗肿瘤活性检测,如下。
1.生长抑制作用:采用MTT法检测3种云莓均一多糖RCP-90-0、RCP-90-1和RCP-90-2对人肝癌HepG-2细胞的生长抑制作用。具体操作步骤为:取对数生长期的人肝癌HepG-2细胞,调整细胞密度为5×104个/mL。在96孔板中每孔加入100μL单细胞悬液,置于37℃、5%CO2培养箱中培养24h。设置0、25、50、100、200mg/L不同浓度的云莓多糖溶液,每孔加入100μl,继续培养72h。弃去培养液,每孔加入100μL的0.5mg/mL MTT溶液,继续培养4h,弃上清,每孔再加入150μL DMSO溶液,振荡10min,用酶标仪在490nm波长下测定其吸光度值(OD)。计算云莓均一多糖对肝癌HepG-2细胞的生长抑制率和IC50。
抑制率(%)=(对照组OD值-给药组OD值)/对照组OD值×100%
云莓均一多糖RCP-90-0、RCP-90-1、RCP-90-2对人肝癌HepG-2细胞的生长抑制作用如图7所示,由图7可知,云莓均一多糖RCP-90-1对人肝癌HepG-2细胞的生长抑制作用显著优于RCP-90-0和RCP-90-2(P<0.05或P<0.01),RCP-90-0、RCP-90-1、RCP-90-2对HepG-2细胞作用72h的IC50值分别为477.34mg/L、23.12mg/L、84.23mg/L。结果表明RCP-90-1对肝癌细胞具有显著的增殖抑制作用,可用于后续肝癌抗肿瘤药物的研究和开发。
2.细胞周期和凋亡检测:采用流式细胞术检测云莓均一多糖RCP-90-1对人肝癌HepG-2细胞周期和细胞凋亡的影响。具体操作为:制备人肝癌HepG-2细胞悬液,调整细胞密度为1×106/mL,6孔板中每孔加入1mL细胞悬液,培养24h后,添加0、50、100、200mg/L的云莓多糖RCP-90-1溶液,继续培养48h。收集细胞,PBS洗2次,75%冰乙醇4℃固定2h以上,2000rpm离心5min,PBS洗涤1次,加入10μL的RNase A和10μL的PI染液(5g/mL),避光染色30min,流式细胞仪检测细胞周期和凋亡率的变化。
用流式细胞术检测云莓多糖RCP-90-1对人肝癌HepG-2细胞周期和细胞凋亡的影响如图8所示,由图8可知,云莓多糖RCP-90-1可诱导HepG-2细胞发生S期周期阻滞和细胞凋亡,且具有剂量依赖性。
3.蛋白表达:采用Western blot检测云莓均一多糖RCP-90-1对肝癌HepG-2细胞中与细胞凋亡和细胞周期相关蛋白表达的影响,主要检测Bcl-2、Bax、Caspase-3、Caspase-9、CDK2、CyclinA等蛋白的表达。主要包括细胞处理及蛋白样品制备、SDS-PAGE电泳、转膜、封闭、一抗孵育、二抗孵育、蛋白检测等步骤,最后采用ECL化学发光试剂盒进行显色,凝胶扫描分析系统进行拍照分析。
用Western Blot法检测RCP-90-1对人肝癌HepG-2细胞中相关蛋白的表达情况如图9所示,结果显示:RCP-90-1可显著上调HepG-2细胞中Bax、Caspase-3、caspase-9、Cyt-C蛋白的表达,下调Bcl-2和细胞周期蛋白CyclinA、CDK2的表达。此外,RCP-90-1还通过调控PI3K-AKT信号通路抑制人肝癌HepG-2细胞的活性,表现为细胞中PI3K、p-PI3K、Akt、p-Akt蛋白表达量显著降低。
结果表明,云莓多糖RCP-90-1主要通过线粒体凋亡途径和PI3K-AKT信号通路抑制人肝癌HepG-2细胞的活性,诱导细胞凋亡和细胞周期阻滞,云莓均一多糖RCP-90-1可作为一种新型的抗肿瘤药物应于临床上肝癌的治疗领域。
Claims (10)
1.一种云莓均一多糖RCP-90-1,其特征在于该云莓均一多糖RCP-90-1是由阿拉伯糖、葡萄糖、半乳糖、木糖、核糖与甘露糖按摩尔比为0.63:4.17:1.0:0.62:0.45:0.17构成的多糖,云莓均一多糖RCP-90-1的分子量为3.75kDa。
2.分离纯化权利要求1所述的一种云莓均一多糖RCP-90-1的方法,其特征在于该方法按以下步骤进行:
(1)云莓的粉碎、脱脂:将干净的云莓果干粉碎过筛,获得云莓粉末,用石油醚回流提取,除去其中的脂溶性物质,得到云莓果渣;
(2)云莓多糖的提取:将云莓果渣与含有4%~6%乙醇的蒸馏水按料液比1:(18~22)的比例混合进行闪式提取,设置提取电压180~220V,提取温度80~90℃,提取时间80~100s,反复提取2次,过滤后合并提取液;
(3)云莓粗多糖的浓缩:将提取液冷却、浓缩,获得浓缩液;再将无水乙醇加入到浓缩液中,4℃条件下醇沉12h~15h,离心分离、浓缩、真空干燥,获得云莓粗多糖;
(4)云莓粗多糖的脱蛋白处理:采用蛋白酶法和Sevag法联合对云莓粗多糖进行脱蛋白处理,具体操作为:配制云莓粗多糖水溶液,然后加入木瓜蛋白酶,在温度为54~56℃、pH为6的条件下水浴酶解1~1.5h,再沸水浴灭活,离心去除沉淀;然后在上清液中加入Sevag试剂,振荡15~30min,再静置1~1.5h,离心分离,弃去固相物,即变性蛋白,重复2次,取上清液浓缩,干燥,得到固体粉状脱蛋白的云莓多糖;
(5)云莓粗多糖的脱色处理:配制脱蛋白的云莓多糖溶液,调节pH值至8.0,加入2.5%~3%的H2O2溶液脱色,脱色温度为40℃~45℃,脱色时间为1h~1.5h,获得脱色的云莓多糖;
(6)除小分子杂质:将脱蛋白、脱色后的云莓多糖置于透析袋中流水透析24h~48h,蒸馏水透析24h~48h,真空干燥,获得纯云莓多糖;
(7)云莓多糖的醇沉:将纯云莓多糖配制成水溶液,向纯云莓多糖溶液中加入质量百分浓度为90%的乙醇进行醇沉,醇沉时的温度控制在4~5℃,醇沉6~7h,然后离心,浓缩、冷冻真空干燥,得到云莓精多糖RCP-90;
(8)云莓多糖的纯化:将云莓精多糖RCP-90配制成水溶液,离心、过滤,然后将上清液加入到预平衡好的DEAE-52纤维柱中,采用浓度为0.3mol/L的NaCl溶液进行洗脱,洗脱剂流速为1mL/min,收集洗脱液,每管2mL,采用蒽酮-硫酸法对洗脱液进行跟踪检测,收集洗脱峰液体;再加入到Sephadex G-100色谱柱中进一步分离纯化,采用蒸馏水进行洗脱,控制流速为1mL/min,采用蒽酮-硫酸法对层析液进行跟踪检测,收集单一洗脱峰液体;再用蒸馏水透析24h~48h,浓缩、真空冷冻干燥,获得云莓均一多糖RCP-90-1。
3.根据权利要求2所述的一种云莓均一多糖RCP-90-1的分离纯化方法,其特征在于步骤(1)中所述的过筛为过40目筛。
4.根据权利要求2或3所述的一种云莓均一多糖RCP-90-1的分离纯化方法,其特征在于,步骤(1)中所述的用石油醚回流提取的次数为2次,每次提取2h。
5.根据权利要求2或3所述的一种云莓均一多糖RCP-90-1的分离纯化方法,其特征在于,步骤(3)中所述的离心分离是在转速为3000~4000rpm离心分离10~15min。
6.根据权利要求2或3所述的一种云莓均一多糖RCP-90-1的分离纯化方法,其特征在于,步骤(4)中所述的Sevag试剂为氯仿:正丁醇按体积比为5:1的混合溶液。
7.根据权利要求2或3所述的一种云莓均一多糖RCP-90-1的分离纯化方法,其特征在于,步骤(4)中,云莓粗多糖的脱蛋白处理中,木瓜蛋白酶溶液的加入量是按每克云莓粗多糖加入1000U/mL的木瓜蛋白酶溶液2~3mL。
8.根据权利要求2或3所述的一种云莓均一多糖RCP-90-1的分离纯化方法,其特征在于,步骤(4)中所述的离心分离是在转速为3000~4000rpm离心分离10~15min。
9.根据权利要求2或3所述的一种云莓均一多糖RCP-90-1的分离纯化方法,其特征在于,步骤(4)中所述的干燥是在温度为40℃的烘箱中干燥1~2小时。
10.根据权利要求1所述的一种云莓均一多糖RCP-90-1的应用,其特征在于该应用是将云莓均一多糖 RCP-90-1作为制备治疗肝癌抗肿瘤药物的应用。
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