在线观看亚洲精品专区-在线观看亚洲免费-在线观看亚洲免费视频-在线观看亚洲欧美-欧美freexxx-欧美free嫩交video

食品伙伴網服務號
 
 
當前位置: 首頁 » 專業英語 » 專業知識 » 正文

Food Components -Molybdenum (Mo)

放大字體  縮小字體 發布日期:2007-05-05
 

Introduction

Molybdenum (Mo) is an essential trace element for virtually all life forms. It functions as a cofactor for a number of enzymes that catalyze important chemical transformations in the global carbon, nitrogen, and sulphur cycles.

Molybdenum is concentrated primarily in the liver, kidney, bone, and skin. There is estimated to be approximately nine milligrams of molybdenum in the adult human body.

Food Sources

Legumes such as beans, lentils, and peas are the richest sources of molybdenum. Grain products and nuts are considered good sources while animal products, fruits, and many vegetables are generally low in molybdenum. Because the molybdenum content of plants depends on the soil molybdenum content and environmental conditions, the molybdenum content of foods can vary considerably between different geographic areas.

Some important food sources of Molybdenum

 

Yeast
Lentils
Liver
Spinach
Green cabbage
Whole grain bread
Brown rice
Kidneys
Red beans
Nuts

 

Recommended Dietary Allowance (RDA)

The European Union has not set an RDA for the general population. The US RDA for molybdenum is 43-45 µg/day for adults.

Inhibitors/stimulators:

The following food components have been found to stimulate the absorption of molybdenum:

Copper – Copper is an antagonist to molybdenum absorption.

 

Functions in the Body

The biological form of molybdenum present in almost all molybdenum-containing enzymes (molybdoenzymes) is an organic molecule known as the molybdenum cofactor. In humans, molybdenum is known to function as a cofactor for three enzymes.

Sulphite Oxidase – catalyzes the transformation of sulphite to sulphate, a reaction that is necessary for the metabolism of sulphur-containing amino acids such as cysteine.

Xanthine Oxidase and Aldehyde Oxidase – catalyze hydroxylation reaction involving a number of different molecules with similar structures. Xanthine oxidase catalyzes the breakdown of nucleotides (precursors to DNA and RNA) to form uric acid, which contributes to the antioxidant capacity of the blood. Xanthine oxidase and aldehyde oxidase also play a role in the metabolism of drugs and toxins. Of these three enzymes, only sulphite oxidase is known to be crucial for human health.

Deficiency

Dietary molybdenum deficiency has never been observed in healthy people.

Toxicity

Symptoms of molybdenum toxicity include diarrhoea, depressed growth rate, and anemia. Gout-like symptoms may result from excessive intake. Molybdenum toxicity from food is highly unlikely though.

High levels of molybdenum intake can induce a high rate of copper excretion (due to the antagonistic effect the two minerals have on each other), which could possibly result in a copper deficiency.

A high intake of molybdenum can alter the activity of alkaline phosphatase, resulting in certain bone abnormalities. Alkaline phosphatase enzymatically releases phosphate groups from the molecule glucose-1-phosphate, thereby producing high levels of inorganic phosphate; phosphate is necessary to produce hydroxyapatite crystals in bone.

Regulation

Molybdenum absorption occurs readily in gastrointestinal tract, and excretion occurs primarily via the urine.

更多翻譯詳細信息請點擊:http://www.trans1.cn
 
[ 網刊訂閱 ]  [ 專業英語搜索 ]  [ ]  [ 告訴好友 ]  [ 打印本文 ]  [ 關閉窗口 ] [ 返回頂部 ]
分享:

 

 
推薦圖文
推薦專業英語
點擊排行
 
 
Processed in 1.040 second(s), 219 queries, Memory 1.64 M
主站蜘蛛池模板: 国产女人和拘做受视频免费 | 天天爽夜夜 | 国产一级做a爰片久久毛片男 | 色五月婷婷成人网 | 国内精品久久久久影院免费 | 视频在线高清完整免费观看 | 欧美在线性 | 午夜dy888理论 | 国模私拍大尺度视频在线播放 | 大尺度在线 | 天堂-bt种子 | 亚洲日本一区二区三区在线不卡 | 最色网站 | 你懂得福利 | 两性午夜欧美高清做性 | 黄色免费的视频 | 九色国产在视频线精品视频 | 国产亚洲视频在线 | 黄色avav| 天堂a| 天天躁夜夜躁狠狠躁2018a | 视频1区| 九月丁香婷婷亚洲综合色 | 亚洲区在线播放 | 国产片一级aaa毛片视频 | 婷婷色天使在线视频观看 | 在线中文字幕第一页 | 午夜色大片在线观看 | 天天上天天干 | 久久成人亚洲 | 亚洲日本欧美日韩高观看 | 永久网站色视频在线观看免费 | 国产欧美日韩在线人成aaaa | 超黄视频在线观看 | 男人资源在线 | 中文字幕在线观看日剧网 | 天天干天天操天天爽 | 亚洲黄色网址在线观看 | 欧美成人精品一区二区 | 国内精品免费视频自在线 | 天堂视频在线观看 |