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(wǎng)服務(wù)號
 
 
當前位置: 首頁 » 專業(yè)英語 » 專業(yè)知識 » 正文

What exactly is astaxanthin and why does it make salmon red?

放大字體  縮小字體 發(fā)布日期:2007-06-13
核心提示:Astaxanthin is the red pigment that gives salmon, shrimp and flamingos their pink-red colour. Chemically it is similar to -carotene (in carrots) and vitamin A. It is part of the group of carotenoids. The chemical structure of astaxanthin is shown be

Astaxanthin is the red pigment that gives salmon, shrimp and flamingos their pink-red colour. Chemically it is similar to ß-carotene (in carrots) and vitamin A. It is part of the group of carotenoids. The chemical structure of astaxanthin is shown below:

Astaxanthin is made by several kinds of algae and plankton. These are eaten by many aquatic species including crustaceans, amongst which are shrimps, which store the pigment in their shell, resulting in their pink-red exterior. Crustaceans in turn are eaten by fish (salmon, trout) or birds (flamingo, red ibis). These also store the pigment in their skin and fatty tissue. This is the reason why salmon and other animals are red. Astaxanthin does not undergo bleaching, thus these animals retain their pink coloration.

The function of astaxanthin in connection with aquatic animals is not entirely clear. However, it is a potent antioxidant, comparable to vitamin E. It may also offer protection against UV light.

Only algae can produce astaxanthin; higher animals cannot alter the chemical structure. This has important consequences for aquaculture (fish farming).

Salmon farming exists in several forms. Salmon can be grown in the sea, where their diet is partly natural, but they also get additional food. Another way to culture salmon is in tanks on land. In this case they do not eat a natural diet, but get fish feed. However, without shrimp or another source of astaxanthin, salmon will remain white. The consumer does not want this, which means astaxanthin will have to be added to the fish feed

Astaxanthin is chemically made from carotene. This is the most common source of astaxanthin in fish feed. Other possibilities are: adding shrimp waste or adding a powder made from astaxanthin-producing yeasts. However, the last two methods are considerably more expensive, which is why the chemically made astaxanthin is mainly used.

It is chemically different (mirror image of the natural astaxanthin) but for salmon or men it makes no difference.

更多翻譯詳細信息請點擊:http://www.trans1.cn
 
關(guān)鍵詞: is the in of astaxanthin salmon their fish are and
[ 網(wǎng)刊訂閱 ]  [ 專業(yè)英語搜索 ]  [ ]  [ 告訴好友 ]  [ 打印本文 ]  [ 關(guān)閉窗口 ] [ 返回頂部 ]
分享:

 

 
推薦圖文
推薦專業(yè)英語
點擊排行
 
 
Processed in 5.121 second(s), 915 queries, Memory 3.39 M
主站蜘蛛池模板: 久久澳门| 国产黄在线观看免费观看不卡 | 久久国产精品久久久久久久久久 | 夜夜澡人人爽人人喊_欧美 夜夜综合网 | 2021久久精品国产99国产精品 | 欧美簧片| 亚洲国产成人精品不卡青青草原 | 在线观看一二三区 | 亚洲精品视频专区 | 视频一区二区在线观看 | 人人做人人爽国产视 | 91视频免费观看 | video欧美性精品 | ww免费视频| 亚洲 欧美 中文字幕 | 成人国产一区二区 | 亚洲久久草 | 久久五月女厕所一区二区 | 天天插伊人 | 国产成人精品系列在线观看 | 伊人男人天堂 | 成年网站在线 | 免费任我爽橹视频在线观看 | 4hc44www四虎永久 | 免费视频一区 | 天天色踪合合 | 日本成人黄色网址 | 国产三级精品三级在线观看 | 男女交性视频免费视频 | 91视频精品 | 日本免费一级 | 看免费视频| 欧美成人性色 | 六月色 | 性欧美高清视频 | 欧美一级一一特黄 | 精品精品国产高清a毛片牛牛 | 男男之h啪肉np文 | 日本人的色道www免费一区 | 色鬼久久 | 一级片在线免费观看 |