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【科普】抑制肾结石，橙汁有功效
Orange Juice Best at Stopping Kidney Stones
By Robert Preidt
Monday, September 4, 2006
MONDAY, Sept. 4 (HealthDay News) -- An independent study finds that orange juice beats lemonade and other citrus fruit juices in helping to keep kidney stones at bay.
一项独立性研究表明橙汁在辅助抑制肾结石形成的作用要比柠檬汁和其他柑橘类果汁强。
Experts have long known that potassium citrate -- found in citrus juice -- can slow stone formation in people with a history of the condition.
长期以来，专家们就知道在柑橘类果汁中存在的柠檬酸钾能够减缓肾结石患者体内肾结石的形成。
But this study, by a team from the University of Texas Southwestern Medical Center at Dallas, found that other components can affect a juice's ability to prevent stones.
但在这个由位于达拉斯的德克萨斯大学西南医学中心的研究小组完成的试验表明其他成分能够影响果汁抑制结石形成的能力。
Thirteen volunteers (some with a history of kidney stones and some without) took part in the multi-phase trial, which was funded by the U.S. National Institutes of Health. For one week, participants drank distilled water, for another week orange juice, and then lemonade for another week. There was a three-week interval between each of these weeks.
13个志愿者包括结石患者和没有结石病史的志愿者参与了这个由美国国家健康研究所资助的多相试验。他们饮用纯净水一周，再饮用橙汁一周，然后柠檬汁一周。这些实验周均间隔三个周。
During each phase, the participants drank 13 ounces of orange juice, lemonade or distilled water three times a day with meals. They were also put on a low-calcium, low-oxalate diet, which also helps cut stone formation.
在每个试验期内，参加者一日三次进餐时饮用12盎司的橙汁，柠檬汁或者纯净水。他们也要低钙低发草酸盐饮食以帮助减少结石形成。
The study found that orange juice increased levels of citrate in the urine and reduced the crystallization of uric acid and calcium oxalate, the most common components of kidney stones. Lemonade did not increase citrate levels.
研究发现橙汁能够增加尿中柠檬酸的水平并减少肾结石的主要成分尿酸和草酸钙结晶的形成。而柠檬汁并不增加柠檬酸盐的水平
"One reason might be the different constituents of various beverages," study lead author Dr. Clarita Odvina, assistant professor of internal medicine at the Charles and Jane Pak Center for Mineral Metabolism and Clinical Research, said in a prepared statement.
"其中一个原因可能是不同饮料中的不同的组分，"研究首席作者Clarita Odvina 博士在文章中说，他是Charles and Jane Pak Center for Mineral Metabolism and Clinical Research的内科副教授。
Odvina noted that the citrate in orange and grapefruit is accompanied by a potassium ion while the citrate in lemonade and cranberry juice is accompanied by a hydrogen ion. While hydrogen ions counteract the beneficial effects of high citrate content, potassium ions do not.
Odvina指明在橙子和葡萄中柠檬酸盐是以钾盐的形式存在而在柠檬和酸果汁则以氢盐存在。氢离子可以对抗高柠檬酸盐带来的益处，而钾离子则不能。
The study is available online and was expected to be published in the Oct. 26 print issue of the Clinical Journal of the American Society of Nephrology.
http://www.nlm.nih.gov/medlineplus/news/fullstory_38181.html
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作者:admin@医学,生命科学 2011-09-07 17:12
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