类胡萝卜素功能

类胡萝卜素功能

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  世界上的类胡萝卜素有600多种,其中约50多种可以转化训维生素A。食物及收听中的类胡萝卜素主要为阿尔法、贝他胡萝卜素和叶黄素。红心蛋含有较多的类胡萝卜素,这种蛋不仅蛋黄色好看、好吃,而且具有抗自由基、抗衰老、降血脂、增强血管弹性、增强视觉能力、提高人体免疫力等功能。

  1、 抗氧化、抗衰老

  类胡萝卜素具有抗氧化的功能:类胡萝卜素分子结构中含有多个共轭双键,能减少自由基对细胞遗传物质(DNA、RNA)和细胞膜(如蛋白质、脂质和碳水化合物)的损伤。生物系统中一但形成高度活泼具有损伤能力的自由基后,自由基就会靠近蛋白质、脂质和核酸等细胞的重要组分,并进行强烈破坏。如羟基自由基可以损伤90%的DNA,单线态氧和羟自由基能使DNA的股链断裂。如果基因物质的损伤长时间不能修复,会导致癌细胞生成。自由基是在正常的氧条件下产生的,许多研究表明,在机体衰老、患病及炎症过程中,体内自由基增加,而类胡萝卜素能抑制自由基的产生或消除过多的自由基,可以延缓衰老和预防癌症。

  2、 免疫调节

  免疫系统除了有免疫防御即保护机体免受细菌、病毒等病原体引起的疾病的作用外,还有免疫监视即及时发现并吞噬癌细胞预防癌症的作用。研究人员指出,类胡萝卜素能增强免疫系统中B细胞的活力,B细胞能在机体内循环并消灭外源病原体;类胡萝卜素还协助B细胞产生抗体,并提高其他免疫组分的活性;类胡萝卜素能增加嗜中性白细胞的数目,它可以包围细菌和分泌降解细菌的和种酶类;类胡萝卜素还能增加自然杀伤细胞即NK细胞的数目,消除机体内被感染的细胞或癌细胞。在TjoelKer等进行的体外试验结果表明,10—6mol/L胡萝卜素可刺激干乳期前后奶牛腹膜巨噬细胞的吞噬与杀菌力

  3、 抗癌

  2004年在格拉斯格生命科技大会上,美国夏威夷大学一们博士宣读了份研究报告,类胡萝卜素防癌抗癌机理,是增强了细胞与细胞之间的信息联系联系,从而保证了细胞生长、发育、分裂的信息稳定传递,而缺少则易引起突变致癌。多项项表明许多类胡萝卜素具有抗癌活力,类胡萝卜素的应用可能使癌症致死的危险性降低20%—30%。流行病学,药理实验都肯定?胡萝卜素、西红柿红素、叶黄素等类胡萝卜素具有抗癌作用其中,?胡萝卜素对一些癌前病变如口腔癌,鼻咽癌有比较好的治疗效果,?胡萝卜素对肺癌,宫颈癌,卵巢癌,食道癌也有预防作用。流得病学研究还表明,饮食中富含类胡萝卜素的果蔬的抗癌位点有肺、胰腺、胃、肝、结肠、乳腺等处,综上所述,类胡萝卜素具有防治癌症的作用,有益于人类的健康。

  上海安利-纽崔莱公司已开发出天然类胡萝卜素胶囊,180粒一瓶340元。

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