CN112336789A - 一种普洱茶茶褐素在制备预防代谢综合征药物中的应用 - Google Patents
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Abstract
本发明涉及一种普洱茶茶褐素在制备预防代谢综合征药物中的应用,尤其涉及普洱茶茶褐素用于降低大鼠血清中糖化血红蛋白A1c(GHbA1c)。本发明普洱茶茶褐素剂量为0.125‑1.125 g/kg·bw时,其降低糖化血红蛋白A1c(GHbA1c)含量的百分比为1.9%‑34.2%。本发明的普洱茶茶褐素经动物实验测定,具有降低大鼠血清中糖化血红蛋白A1c(GHbA1c)的作用,可用于制成食品或保健食品;也可以用于制成食品或保健食品的添加剂。
Description
技术领域
本发明涉及一种普洱茶茶褐素在制备预防代谢综合征药物中的应用,尤其涉及普洱茶茶褐素用于降低大鼠血清中糖化血红蛋白A1c(GHbA1c)。
背景技术
随着生活方式、饮食习惯的改变以及日常运动量的减少,代谢综合征(metabolicsyndrome,MS)的发病率有明显升高的趋势,MS已成为严重威胁人类健康的公共卫生问题。因此,干预和控制代谢综合征具有重要的理论和现实意义。由于MS是一个综合性的临床症候群,并不等同于单纯的原发性高血压、糖尿病、血脂紊乱和肥胖症,也不是几种疾病的简单相加,但目前认为其主要病因是胰岛素抵抗(IR)。代谢综合征大鼠往往血糖水平升高,产生胰岛素抵抗。血糖是从食物中的碳水化合物分解而来的血液中的单糖,通常仅指葡萄糖。血糖测试结果反映的是即刻的血糖水平。糖化血红蛋白指的是红细胞中的血红蛋白的糖基化部分,是血液中红细胞的血红蛋白与血糖相结合的产物。其形成过程是连续缓慢的,是一种相对不可逆的化学反应。
糖化血红蛋白测试通常可以反映患者近8~12周的血糖控制情况。糖化血红蛋白是糖尿病诊断新标准和治疗监测的“金标准”。与空腹血糖相比,糖化血红蛋白能够更好地,更稳定地反映患者一段时间内的平均血糖水平,且受外界环境因素的影响更小。它不仅能够间接反应血糖浓度的变化,也能反应机体的糖代谢状态。因此,分析糖化血红蛋白的含量水平更能精准反映代谢综合征大鼠血糖水平。普洱茶茶褐素(theabrownin,TB)是云南普洱茶重要的活性成分,对普洱茶感官品质和功能作用有重要影响。研究显示饮用茶褐素干预代谢综合征可能是一条重要的膳食途径。有研究显示茶褐素可以抑制空腹血糖的升高,但其对糖化血红蛋白的影响尚不清楚,也未有相关的研究报道。
发明内容
为了克服背景技术中存在的问题,本发明的目的在于提供一种普洱茶茶褐素在制备预防代谢综合征药物中的应用。本发明为了评估普洱茶茶褐素降低血清糖化血红蛋白A1c(GHbA1c)的作用,通过对代谢综合征模型动物的干预作用来评价普洱茶茶褐素降低血清糖化血红蛋白的效果。
一种普洱茶茶褐素在制备预防代谢综合征药物中的应用,其特征在于:所述的普洱茶茶褐素用于降低血清中糖化血红蛋白A1c(GHbA1c)含量。
一种普洱茶茶褐素在制备预防代谢综合征药物中的应用,其特征在于:所述的普洱茶茶褐素剂量为0.125-1.125g/kg·bw时,其降低代谢综合征血清中的糖化血红蛋白A1c(GHbA1c)含量的百分比为1.9%-34.2%。
一种普洱茶茶褐素在制备预防代谢综合征食品和保健品中的应用。
本发明的有益效果:本发明是关于普洱茶茶褐素降低血清中糖化血红蛋白的报道,使茶褐素可以应用于制备预防代谢综合征的药物中。茶褐素是茶色素的主体成分,其含量占茶色素总量85%以上,是一类酚性氧化聚合物的异质类群,从中已检出儿茶素二聚物,低聚合物和少量高聚合体。
研究证明普洱茶茶褐素可以降低代谢综合征血清中的糖化血红蛋白A1c(GHbA1c)含量,当普洱茶茶褐素剂量为0.125-1.125g/kg·bw时,其降低代谢综合征血清中的糖化血红蛋白A1c(GHbA1c)含量的百分比为1.9%-34.2%。因此,普洱茶茶褐素可以被用于制备预防代谢综合征的药物。
具体实施方式
为了使本发明的目的、技术方案和有益效果更加清楚,下面将对本发明的优选实施例进行详细的说明,以方便技术人员理解。
本发明所用的普洱茶茶褐素制备方法包括如下步骤:
A、将普洱茶熟茶茶叶粉碎,加蒸馏水(95℃)浸提2次,每次30min,过滤,合并滤液,滤液减压浓缩(65℃,0.07MPa),制备得浓缩液;
B、按浓缩液:无水乙醇(1:4,V/V),醇沉,离心,收集沉淀,真空冷冻干燥→茶褐素。
本发明所用的实验动物的饲养方法为:
1、选用雄性SPF级健康Sprague Dawley(SD)大鼠,日龄40~60天,体重180g~220g。
2、实验大鼠在空调动物饲养室中同室群笼喂养,自由摄食、饮水,室温20~24℃,相对湿度40~70%,每日12h光照明暗交替。
3、所用动物饲料由昆明医科大学动物实验中心提供,基础饲料主要成分为玉米、麸皮和豆粨;代谢综合征模型大鼠和不同剂量茶褐素预防的组别大鼠均饲喂同样的高脂高糖高盐饲料。高脂高糖高盐饲料组成:普通饲料60%,猪油13%,蛋黄10%,糖11%,食用盐4%,胆固醇1.5%,胆盐0.5%,饮用30%的果糖水。基础饲料中碳水化合物热卡占61.10%,脂肪热卡占10.67%,蛋白质热卡占28.22%;高脂高糖高盐饲料中碳水化合物热卡占37.6%,脂肪热卡占47.4%,蛋白质热卡占15.0%。每日按照每组实验动物的体重,称取不同量的茶褐素,溶于3mL蒸馏水中,经口一次性灌胃;其中不同剂量组按照设定的剂量每日经口灌胃茶褐素,代谢综合征模型大鼠组作为对照组,每日经口灌胃蒸馏水3mL。
代谢综合征模型大鼠组作为对比例,共计大鼠10只,按照上述方法对组内大鼠进行喂食。
本发明用于测试降低糖化血红蛋白A1c(GHbA1c)含量的方法为:
实验动物干预8周后,12h禁食不禁水,乙醚麻醉实验大鼠,进行眼眶采血,收集血样37℃水浴保温1h后,在2500-3000r/min低速离心机上离心15min,用移液枪吸取上层血清,分装于0.5mL离心管中,得到的样品放于4℃冰箱保存。使用上海酶联生物科技有限公司提供的大鼠酶联免疫分析试剂盒,按照使用说明书,采用Thermo mk3酶标仪在450nm处显色测定。
实施例1
实施例1,共计大鼠10只,按照本发明所用的实验动物的饲养方法对组内大鼠进行饲养;再将本发明制备的茶褐素,每日按照组内大鼠的体重,按0.125g/kg·bw的大鼠给药剂量,溶于3mL蒸馏水中,经口一次性灌胃。干预8周后,对组内大鼠的体重、甘油三酯、血糖和糖化血红蛋白进行检测,检测结果见表1。该茶褐素剂量下,与对比例(代谢综合征模型大鼠组)相比,其降低糖化血红蛋白A1c(GHbA1c)含量的百分比为1.9%。
实施例2
实施例2,共计大鼠10只,按照本发明所用的实验动物的饲养方法对组内大鼠进行饲养;再将本发明制备的茶褐素,每日按照组内大鼠的体重,按0.625g/kg·bw的大鼠给药剂量,溶于3mL蒸馏水中,经口一次性灌胃。干预8周后,对组内大鼠的体重、甘油三酯、血糖和糖化血红蛋白进行检测,检测结果见表1。该茶褐素剂量下,与对比例(代谢综合征模型大鼠组)相比,其降低糖化血红蛋白A1c(GHbA1c)含量的百分比为21.74%。
实施例3
实施例3,共计大鼠10只,按照本发明所用的实验动物的饲养方法对组内大鼠进行饲养;再将本发明制备的茶褐素,每日按照组内大鼠的体重,按1.125g/kg·bw的大鼠给药剂量,溶于3mL蒸馏水中,经口一次性灌胃。干预8周后,对组内大鼠的体重、甘油三酯、血糖和糖化血红蛋白进行检测,检测结果见表1。该茶褐素剂量下,与对比例(代谢综合征模型大鼠组)相比,其降低糖化血红蛋白A1c(GHbA1c)含量的百分比为34.2%。
对比例
代谢综合征模型大鼠组,共计大鼠10只,按照本发明所用的实验动物的饲养方法对组内大鼠进行饲养;每日将3mL蒸馏水经口一次性灌胃。8周后,对组内大鼠的体重、甘油三酯、血糖和糖化血红蛋白进行检测,检测结果见表1。
表1实施例与对比例中大鼠体重、甘油三酯、血糖和糖化血红蛋白数值
动物实验结果表明:普洱茶茶褐素干预处理8周,随着普洱茶茶褐素给药量的增加,与对比例(代谢综合征模型大鼠组)相比,其降低糖化血红蛋白A1c(GHbA1c)含量的百分比逐渐增加,提示普洱茶茶褐素对糖化血红蛋白有明显的降低作用。与对比例相比,实施例2和实施例3剂量下的降低作用分别具有显著差异和极显著差异。
同时,普洱茶茶褐素干预处理8周,随着普洱茶茶褐素给药量的增加,与对比例(代谢综合征模型大鼠组)相比,其均达到降低代谢综合征大鼠的体重、甘油三酯、血糖以及改善胰岛素抵抗的效果。
最后说明的是,以上优选实施例仅用于说明本发明的技术方案而非限制,尽管通过上述优选实施例已经对本发明进行了详细的描述,但本领域技术人员应当理解,可以在形式上和细节上对其作出各种各样的改变,而不偏离本发明权利要求书所限定的范围。
Claims (3)
1.一种普洱茶茶褐素在制备预防代谢综合征药物中的应用,其特征在于:所述的普洱茶茶褐素用于降低代谢综合征血清中的糖化血红蛋白A1c(GHbA1c)含量。
2.根据权利要求1所述的一种普洱茶茶褐素在制备预防代谢综合征药物中的应用,其特征在于:所述的普洱茶茶褐素剂量为0.125-1.125 g/ kg·bw时,其降低代谢综合征血清中的糖化血红蛋白A1c(GHbA1c)含量的百分比为1.9%-34.2%。
3.一种普洱茶茶褐素在制备预防代谢综合征食品和保健品中的应用。
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