The functions of citric acid include enhancing metabolism, antioxidation, beauty and beauty, and improving food taste. It is mainly used in food, industry, environmental protection, livestock and poultry industry and cosmetics.

柠檬酸又称为枸橼酸，可食用，加入食品当中，可改善食品的口感，适量食用还可以增强人体的新陈代谢。柠檬酸具有抗氧化作用，在防止动脉硬化，软化血管以及降压方面有一定的辅助作用。此外，柠檬酸还具有抗衰老、去除角质层、去除黑色素等美容养颜的作用。根据柠檬酸本身的特性及作用，用途主要体现在五大方面。食品方面，柠檬酸作为酸味剂，防腐剂以及钙离子和铁离子的强化剂，普遍用于饮料和食品方面。工业方面，柠檬酸可作为化学分析用试剂、实验试剂、色谱分析试剂、生化试剂、络合剂及掩蔽剂，方便又快捷。环保方面，可做柠檬酸-柠檬酸钠缓冲液用于烟气脱硫，具有气压低、无毒、化学性质稳定、对SO2的吸收率高等特点，是开发价值的脱硫吸收剂。在畜禽业方面，柠檬酸稀土是一种新型的饲料添加剂，具有促进动物生长，改善产品品质，缩短喂养周期等特点。此外在化妆品方面，柠檬酸常用于乳液、乳霜、洗发精、美白用品、抗老化用品、青春痘用品等。

Citric acid, also known as citric acid, is edible. It can be added to food to improve the taste of food. Eating in proper amount can also enhance the metabolism of the human body. Citric acid has antioxidant effect, and has a certain auxiliary role in preventing arteriosclerosis, softening blood vessels and lowering blood pressure. In addition, citric acid also has the functions of anti-aging, cuticle removal, melanin removal and other beauty. According to the characteristics and functions of citric acid itself, its uses are mainly reflected in five aspects. In terms of food, citric acid is widely used in beverage and food as a sour taste agent, preservative and calcium ion and iron ion strengthening agent. In industry, citric acid can be used as reagent for chemical analysis, experimental reagent, chromatographic reagent, biochemical reagent, complexing agent and masking agent, which is convenient and fast. In terms of environmental protection, it can be used as citric acid sodium citrate buffer solution for flue gas desulfurization. It is characterized by low pressure, non-toxic, stable chemical properties, high SO2 absorption rate, and is a valuable desulfurization absorbent. In livestock and poultry industry, rare earth citrate is a new type of feed additive, which has the characteristics of promoting animal growth, improving product quality and shortening feeding cycle. In addition, in cosmetics, citric acid is often used in lotion, cream, shampoos, whitening products, anti-aging products, acne products, etc.

需要注意的是，适量的柠檬酸对于身体无害，但是大量食用对胃肠损害很大，平时使用需要注意用量。

It should be noted that an appropriate amount of citric acid is harmless to the body, but a large amount of it is harmful to the stomach and intestines. You should pay attention to the dosage when using it at ordinary times.

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