A randomized steady-state bioavailability study of synthetic versus natural (kiwifruit-derived) vitamin C.

A randomized steady-state bioavailability study of synthetic versus natural (kiwifruit-derived) vitamin C.
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DOI:
10.3390/nu5093684
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发表时间:
2013-09-17
期刊:
影响因子:
5.9
通讯作者:
Vissers MC
Vissers MC
中科院分区:
医学2区
文献类型:
--
作者:
Carr AC;Bozonet SM;Pullar JM;Simcock JW;Vissers MC

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天然食品中的维生素C是否与纯化补充剂具有同等的生物利用度尚不清楚。我们之前的研究表明,在基因维生素C缺乏的小鼠模型中,猕猴桃提供的血清和组织抗坏血酸水平明显高于合成维生素C,这表明整个水果具有协同作用。为了确定这些结果是否适用于人类,我们进行了一项随机人体研究,比较了猕猴桃中维生素C的生物利用度与同等剂量的维生素C片的生物利用度。36名不吸烟的年轻成年男性被随机分为两组,一组每天服用半颗金猕猴桃(Actinidia Chinensis var. Hort 16A),另一组连续六周服用同等剂量的维生素C(50毫克)咀嚼片。干预前后每周监测空腹静脉血、尿液、精液、白细胞和骨骼肌(股外侧肌)中的抗坏血酸。使用7天的食物和饮料记录监测饮食中维生素C的摄入量。干预后,受试者血浆(P < 0.001)、尿液(P < 0.05)、单核细胞(P < 0.01)、中性粒细胞(P < 0.01)和肌肉组织(P < 0.001)的抗坏血酸水平升高。在测试的任何液体、细胞或组织样本中,两个干预组之间维生素C的生物利用度没有显著差异。总的来说,我们的研究表明合成维生素C和猕猴桃衍生维生素C的生物利用度相当。
Whether vitamin C from wholefoods has equivalent bioavailability to a purified supplement remains unclear. We have previously showed that kiwifruit provided significantly higher serum and tissue ascorbate levels than synthetic vitamin C in a genetically vitamin C-deficient mouse model, suggesting a synergistic activity of the whole fruit. To determine if these results are translatable to humans, we carried out a randomized human study comparing the bioavailability of vitamin C from kiwifruit with that of a vitamin C tablet of equivalent dosage. Thirty-six young non-smoking adult males were randomized to receive either half a gold kiwifruit (Actinidia Chinensis var. Hort 16A) per day or a comparable vitamin C dose (50 mg) in a chewable tablet for six weeks. Ascorbate was monitored weekly in fasting venous blood and in urine, semen, leukocytes, and skeletal muscle (vastus lateralis) pre- and post-intervention. Dietary intake of vitamin C was monitored using seven day food and beverage records. Participant ascorbate levels increased in plasma (P < 0.001), urine (P < 0.05), mononuclear cells (P < 0.01), neutrophils (P < 0.01) and muscle tissue (P < 0.001) post intervention. There were no significant differences in vitamin C bioavailability between the two intervention groups in any of the fluid, cell or tissue samples tested. Overall, our study showed comparable bioavailability of synthetic and kiwifruit-derived vitamin C.
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