请输入您要查询的英文单词:

 

单词 citric acid
释义

citric acid


citric acid

n. A colorless translucent crystalline acid, C6H8O7, principally derived by fermentation of carbohydrates or from lemon, lime, and pineapple juices and used in preparing citrates and in flavorings and metal polishes.

citric acid

n (Elements & Compounds) a water-soluble weak tribasic acid found in many fruits, esp citrus fruits, and used in pharmaceuticals and as a flavouring (E330). It is extracted from citrus fruits or made by fermenting molasses and is an intermediate in carbohydrate metabolism. Formula: CH2(COOH)C(OH)(COOH)CH2COOH

cit′ric ac′id


n. a white powder, C6H8O7∙H2O, an intermediate in the metabolism of carbohydrates, occurring esp. in citrus fruits: used chiefly in flavorings and pharmaceuticals. [1805–15]

cit·ric acid

(sĭt′rĭk) A white, odorless acid, C6H8O7, having a sour taste and occurring widely in plants, especially in citrus fruit. It is used in medicine and as a flavoring.
Thesaurus
Noun1.citric acid - a weak water-soluble acid found in many fruits (especially citrus fruits)citric acid - a weak water-soluble acid found in many fruits (especially citrus fruits); used as a flavoring agentsour salt - crystals of citric acid used as seasoningacid - any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
Translations
See citric acid

citric acid


citric acid

or

2-hydroxy-1,2,3-propanetricarboxylic acid,

HO2CCH2C(OH)(CO2H)CH2CO2H, an organic carboxylic acid containing three carboxyl groupscarboxyl group
, in chemistry, functional group that consists of a carbon atom joined to an oxygen atom by a double bond and to a hydroxyl group, OH, by a single bond. Carboxylic acids are compounds whose molecules contain a carboxyl group that is joined to a hydrogen atom, an
..... Click the link for more information.
; it is a solid at room temperature, melts at 153&degC;, and decomposes at higher temperatures. It is responsible for the tart taste of various fruits in which it occurs, e.g., lemons, limes, oranges, pineapples, and gooseberries. It can be extracted from the juice of citrus fruits by adding calcium oxide (lime) to form calcium citrate, an insoluble precipitate that can be collected by filtration; the citric acid can be recovered from its calcium salt by adding sulfuric acid. It is obtained also by fermentation of glucose with the aid of the mold Aspergillus niger and can be obtained synthetically from acetone or glycerol. Citric acid is used in soft drinks and in laxatives and cathartics. Its salts, the citrates, have many uses, e.g., ferric ammonium citrate is used in making blueprintblueprint,
white-on-blue photographic print, commonly of a working drawing used during building or manufacturing. The plan is first drawn to scale on a special paper or tracing cloth through which light can penetrate.
..... Click the link for more information.
 paper. Sour salt, used in cooking, is citric acid.

Citric Acid

 

a tribasic organic hydroxy acid widely distributed in living nature. Citric acid is readily soluble in water and alcohol and poorly soluble in most organic solvents. Its melting point is 153°C; its structural formula is

At 175°C one molecule of water is split off, converting citric acid into aconitic acid. Citric acid forms monosubstituted, disub-stituted, and trisubstituted salts known as citrates. Sodium salts of citric acid are readily soluble in water, while tribasic calcium salts are poorly soluble in water, a fact used in extracting citric acid from solutions.

Citric acid is an essential link in the system of biochemical reactions of cell respiration. Along with other components of the tricarboxylic acid cycle, small quantities of citric acid are found in the mitochondria of all cells. Another function of citric acid involves maintenance of the acid-base balance and the ion composition in an organism. Unlike animals, a number of plants and microorganisms are capable of accumulating large quantities of citric acid (5–6 percent in lemon juice, 3–14 percent in makhorka [Nicotiana rustica] leaves, up to 10 percent in the culture fluid of the fungus Aspergillus niger).

Citric acid is used in the food-processing industry, in medicine (for blood preservation), and in photography; it is also used in various dyeing processes. In industry it is prepared from makhorka (after nicotine extraction) or, more often, by the fermentation of sugar or molasses with the aid of Aspergillus niger or other fungi.

E. P. SEREBRIAKOV

citric acid

[′si‚trik ′as·əd] (biochemistry) C6H8O7·H2O A colorless crystalline or white powdery organic, tricarboxylic acid occurring in plants, especially citrus fruits, and used as a flavoring agent, as an antioxidant in foods, and as a sequestering agent; the commercially produced form melts at 153°C.

citric acid

a water-soluble weak tribasic acid found in many fruits, esp citrus fruits, and used in pharmaceuticals and as a flavouring (E330). It is extracted from citrus fruits or made by fermenting molasses and is an intermediate in carbohydrate metabolism. Formula: CH2(COOH)C(OH)(COOH)CH2COOH FORMULA

citric acid


citric acid

 [sit´rik] a compound found in citrus fruits and acting as an antiscorbutic and diuretic. It functions as an anticoagulant in blood preservatives such as citrate phosphate dextrose" >citrate phosphate dextrose, and is a metabolic intermediate in the tricarboxylic acid cycle.

cit·ric ac·id

(sit'rik as'id), The acid of citrus fruits, widely distributed in nature and a key intermediate in intermediary metabolism.

cit·ric ac·id

(sit'rik as'id) The acid of citrus fruits, widely distributed in nature and a key intermediate in intermediary metabolism.

citric acid

An ingredient of various effervescent medications such as urine alkalizing agents.

cit·ric ac·id

(sit'rik as'id) The acid of citrus fruits, widely distributed in nature and a key intermediate in intermediary metabolism.

Patient discussion about citric acid

Q. I have an allergy to citric acid. Is there a cure or preventative for this.......something I can take? Redness of face around features and blurring of vision about half an hour after ingesting. Citric Acid is in a LOT of products.A. Thanks for trying Justin. For the redness, I use a mix of anti-histamine cream and hydro-cortisone. This doesn't help with the blurred-vision of course; it's just a temporary fix for my appearance. It seems that I just need to find things I can eat that don't have citric-acid added (as a preservative or to add a tangy taste) or that have citric-acid in it naturally (like citrus fruits etc.). I have to avoid foods that have the following on the ingredients list: citric-acid, sodium citrate, E330. Hope this info helps some others!

More discussions about citric acid
AcronymsSeecone angle

citric acid


Related to citric acid: citric acid fermentation
  • noun

Words related to citric acid

noun a weak water-soluble acid found in many fruits (especially citrus fruits)

Related Words

  • sour salt
  • acid
随便看

 

英语词典包含2567994条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。

 

Copyright © 2004-2022 Newdu.com All Rights Reserved
更新时间:2024/12/23 19:07:57