Citric Acid Anhydrous 99%

 Citric acid is an important organic acid, also known as citrate, colorless crystals, often contain a molecular crystal water, odorless, strong acidity, soluble in water. Its calcium salt is more easily dissolved in cold water than hot water, which is often used to identify and isolate citric acid. When the crystal is controlled, the suitable temperature can be obtained with anhydrous citric acid. In the industry, food industry, cosmetic industry has many uses

柠檬酸又称枸缘酸，化学名称2-羟基丙烷-1,2,3-三羧酸。根据其含水量的不同，分为一水柠檬酸和无水柠檬酸。柠檬酸的用途非常广泛,用于食品工业占生产量的75%以上,可做为食品的酸味剂,抗氧化剂,pH调节剂,用于清凉饮料、果酱、水果和糕点等食品中。用于医药工业占10%左右,主要用作抗凝血剂、解酸药、矫味剂、化妆品等。用于化学工业等占15%左右,用作缓冲剂、络合剂、金属清洗剂、媒染剂、胶凝剂、调色剂等。在电子、纺织、石油、皮革、建筑、摄影、塑料、铸造和陶瓷等工业领域中都有十分广阔[1] 。

Citric acid also called citric acid, chemical name 2- -1,2,3- three hydroxy propyl carboxylic acid. According to the different water content, it is divided into water citric acid and anhydrous citric acid. The use of citric acid is very wide, for the food industry accounted for more than 75% of the production, can be used as a food sour agent, antioxidant, pH regulator for cool drinks, jams, fruits and cakes and other foods. For the pharmaceutical industry accounted for about 10%, mainly used as an anticoagulant, antacid, flavoring agents, cosmetics etc.. For the chemical industry accounted for about 15%, used as a buffering agent, complexing agent, metal cleaning agent, mordant, gelling agent, toner. In the electronics, textile, oil, leather, construction, photography, plastic, casting and ceramics industries, there is a very broad [1].

作用

Effect

柠檬酸主要用作酸味剂、增溶剂、缓冲剂、抗氧化剂、除腥脱臭剂、风味增进剂、胶凝剂、调色剂等。此外，柠檬酸还有抑制细菌、护色、改进风味、促进蔗糖转化等作用。柠檬酸还具有螯合作用，能够清除某些有害金属。柠檬酸能够防止因酶催化和金属催化引起的氧化作用，从而阻止速冻水果变色变味[5] 。

Citric acid is mainly used as sour agent, solubilizer, buffering agent, antioxidant, deodorization deodorization agent, flavor enhancer, gelling agent, toner. In addition, citric acid and inhibit bacteria, color, improve the flavor, and promote the transformation of sucrose and so on. Citric acid also has a chelating effect, to remove some of the harmful metals. Citric acid can prevent the oxidation caused by enzyme catalysis and catalytic metal, thereby preventing the frozen fruit discoloration [5].

应用

application

在食品添加剂方面主要用于碳酸饮料、果汁饮料、乳酸饮料等清凉饮料和腌制品，其需求量受季节气候的变化而有所变化。柠檬酸约占酸味剂总消耗量的2/3。在水果罐头中添加柠檬酸可保持或改进馆藏水果的风味，提高某些酸度较低的水果罐藏时的酸度（降低pH值），减弱微生物的抗热性和抑制其生长，防止酸度较低的水果罐头常发生的细菌性胀罐和破坏。在糖果中加入柠檬酸作为酸味剂易于和果味协调。在凝胶食品如果酱、果冻中使用柠檬酸能有效降低果胶负电荷，从而使果胶分子间氢键结合而凝胶。在加工蔬菜罐头时，一些蔬菜呈碱性反应，用柠檬酸作pH调整剂，不但可以起到调味作用，还可保持其品质。柠檬酸所具有螯合作用和调节pH值得特性使其在速冻食品的加工中能增加抗氧剂的性能，抑制酶活性，延长食品保存期[5] 。

In the food additives mainly used for carbonated drinks, fruit juice drinks, lactic acid beverages and other cool drinks and pickled products, the demand for seasonal climate change and change. Citric acid accounts for about 2/3 of the total acid consumption. Adding citric acid in canned fruits can maintain or improve the fruit flavor, improve fruit canning some low acidity when the acidity (decreased pH), decreased microbial heat resistance and inhibit the growth of bacteria, to prevent the expansion tank and the destruction of low acidity canned fruit often occurs. In the candy with citric acid as sour agent and easy fruit coordination. In the gel food, if the jam and jelly in the use of citric acid can effectively reduce the negative charge of pectin, so that the molecular hydrogen bond between pectin gel. In the processing of canned vegetables, some vegetables are alkaline reaction, with citric acid as pH adjusting agent, not only can play the role of seasoning, but also to maintain its quality. Citric acid has chelating function and regulation of pH can increase the antioxidant properties that make it worth the performance in the processing of frozen food, enzyme inhibition, prolong the retention period of food [5].