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.

檸檬酸又稱為枸櫞酸，可食用，加入食品當中，可改善食品的口感，適量食用還可以增強人體的新陳代謝。檸檬酸具有抗氧化作用，在防止動脈硬化，軟化血管以及降壓方面有一定的輔助作用。此外，檸檬酸還具有抗衰老、去除角質層、去除黑色素等美容養(yǎng)顏的作用。根據(jù)檸檬酸本身的特性及作用，用途主要體現(xiàn)在五大方面。食品方面，檸檬酸作為酸味劑，防腐劑以及鈣離子和鐵離子的強化劑，普遍用于飲料和食品方面。工業(yè)方面，檸檬酸可作為化學分析用試劑、實驗試劑、色譜分析試劑、生化試劑、絡合劑及掩蔽劑，方便又快捷。環(huán)保方面，可做檸檬酸-檸檬酸鈉緩沖液用于煙氣脫硫，具有氣壓低、無毒、化學性質穩(wěn)定、對SO2的吸收率高等特點，是開發(fā)價值的脫硫吸收劑。在畜禽業(yè)方面，檸檬酸稀土是一種新型的飼料添加劑，具有促進動物生長，改善產品品質，縮短喂養(yǎng)周期等特點。此外在化妝品方面，檸檬酸常用于乳液、乳霜、洗發(fā)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，適量的檸檬酸對于身體無害，但是大量食用對胃腸損害很大，平時使用需要注意用量。

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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