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Old 05-20-2011, 12:22 AM   #1
ykjh6789
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Default 维生素c的作用

维生素C又叫抗坏血酸,是一种水溶性维生素。
  维生素C主要生理功能
  1、 促进骨胶原的生物合成。利于组织创伤口的更快愈合;
  2、 促进氨基酸中酪氨酸和色氨酸的代谢,延长肌体寿命。
  3、 改善铁、钙和叶酸的利用。
  4、 改善脂肪和类脂特别是胆固醇的代谢,预防心血管病。
  5、 促进牙齿和骨骼的生长,防止牙床出血。;
  6、 增强肌体对外界环境的抗应激能力和免疫力。
  药物作用
  维生素C在体内参与多种反应,如参与氧化还原过程,在生物氧化和还原作用以及细胞呼吸中起重要作用。从 组织水平看,维生素C的主要作用是与细胞间质的合成有关。包括胶原,牙和骨的基质,以及毛细血管内皮细胞间 的接合物。因此,当维生素C缺乏所引起的坏血病时,伴有胶原合成缺陷,表现为创伤通难以愈合,牙齿形成障碍 和毛细血管破损引起大量瘀血点,瘀血点融合形成瘀斑。
  维生素C和坏血病有一段很长的历史渊源。希波克拉底是第一个提到坏血病的人。他描述当时士兵牙床溃烂、 牙齿脱落。。。;早期的海上旅行引起了人们对坏血病的重视,船队离开港口3—4个月,船员往往会因此患上坏 血病,人们开始发现这是由于海上旅行缺乏新鲜蔬菜和水果的缘故。1932年英国军医从柠檬汁中离析出具有抗 坏血病的晶状物质,1933年瑞士科学家合成了维生素C,又叫做抗坏血酸。近代研究表明VC对人体健康至关 重要:
  1.胶原蛋白的合成需要维生素C参加,所以VC缺乏,胶原蛋白不能正常合成,导致细胞连接障碍。人体由 细胞组成,细胞靠细胞间质把它们联系起来,细胞间质的关键成分是胶原蛋白。胶原蛋白占身体蛋白 质的1/3,生成结缔组织,构成身体骨架。如骨骼、血管、韧带等,决定了皮肤的弹性,保护大脑,并且有助于人体创伤 的愈合。
  2.坏血病。血管壁的强度和VC有很大关系。微血管是所有血管中最细小的,管壁可能只有一个细胞的厚度 ,其强度、弹性是由负责连接细胞具有胶泥作用的胶原蛋白所决定。当体内VC不足,微血管容易破裂,血液流到 邻近组织。这种情况在皮肤表面发生,则产生淤血、紫癍;在体内发生则引起疼痛和关节涨痛。严重情况在胃、肠 道、鼻、肾脏及骨膜下面均可有出血现象,乃至死亡。
  3.牙龈萎缩、出血,健康电子烟。健康的牙床紧紧包住每一颗牙齿。牙龈是软组织,当缺乏蛋白质、钙、VC时易产生牙龈萎缩、出 血。
  4.预防动脉硬化。可促进胆固醇的排泄,防止胆固醇在动脉内壁沉积,甚至可以使沉积的粥样 斑块溶解。
  5.是一种水溶性的强有力的抗氧化剂。可以保护其它抗氧化剂,如维生素A、维生素E、不饱和脂肪酸,防 止自由基对人体的伤害。
  6.治疗贫血。使难以吸收利用的三价铁还原成二价铁,促进畅道对铁的吸收,提高肝脏对铁的利用率,有助 于治疗缺铁性贫血。
  7.防癌。丰富的胶原蛋白有助于防止癌细胞的扩散;VC的抗氧化作用可以抵御自由基对细胞的伤害防止细 胞的变异;阻断亚硝酸盐和仲胺形成强致癌物亚硝胺。曾有人对因癌症死亡病人解剖发现病人体内的VC含量几乎 为零。
  8.保护细胞、解毒,保护肝脏。在人的生命活动中,保证细胞的完整性和代谢的正常进行至关重要。为此, 谷胱甘肽和酶起着重要作用。
  谷胱甘肽是由谷氨酸、胱氨酸和甘氨酸组成的短肽,在体内有氧化还原作用。它有两种存在形式,即氧化型和 还原型,还原型对保证细胞膜的完整性起重要作用。VC是一种强抗氧化剂,健尔马脊柱保,其本身被氧化,而使氧化型谷胱甘肽还原为还原型谷胱甘肽,从而发挥抗氧化作用。
  酶是生化反应的催化剂,有些酶需要有自由的琉基(-SH)才能保持活性。VC能够使双硫键(-S-S)还原为-SH,从而提高相关酶的活性,发挥抗氧化的作用。
  从以上可知,只要VC充足,健尔马足疗机厂家,则VC、谷胱甘肽、-SH形成有力的抗氧化组合拳,清除自由基,阻止脂类过氧化及某些化学物质的毒害作用,保护肝脏的解毒能力和 细胞的正常代谢。
  9.提高人体的免疫力。
  白细胞含有丰富的VC,健尔马脊柱保,当机体感染时白细胞内的VC急剧减少。VC可增强中性粒细胞的趋化性和变形能力,提高杀菌能 力。
  促进淋巴母细胞的生成,提高机体对外来和恶变细胞的识别和杀灭。
  参与免疫球蛋白的合成。
  提高CI补体酯酶活性,增加补体CI的产生。
  促进干扰素的产生,干扰病毒mRNA的转录,抑制病毒的增生。
  10.提高机体的应急能力,红泰昌2017b足浴盆。人体受到异常的刺激,如剧痛、寒冷、缺氧、精神强刺激,会引发抵御异常刺激的紧张状态。该状态伴有一系列 身体,朗欣特足浴盆,包括交感神经兴奋、肾上腺髓质和皮质激素分泌增多。肾上腺髓质所分泌的肾上腺素和去甲肾上腺素是有酪氨酸 转化而来,在次过程需要VC的参与。
  进入人体的维生素C很快分布于个组织器官,在正常情况下,人体维生素C库为1500毫克。多余的大部分 随尿排出,少部分随大便、汗及呼吸道排出。但是在感染情况下,人体所需的为平时的20---40倍之多,而且所有的药物都会破坏体内的VC。所以在人体有状态的情况下补充VC是非常有益的。美国著名 营养学家戴维斯问过对营养学有研究的医生,是否应将VC当作家中常备药品,以便任何疾病初期都可以服用。大 多数医生都说:“当然比任何阿司匹林安全多了”,第一次使用足够的量比连续使用小剂量有更好的 效果。
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Old 05-20-2011, 12:27 AM   #2
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