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苯甲酸又称安息香酸,在饮料中广泛应用它作为防腐剂。在P~H值低的环境中,苯甲酸对广泛的微生物有效,抑菌的最适P~H值为2.5～4。实际应用时,以低于P~H4.5～5为宜。国家标准根据不同的食品品种,规定苯甲酸的最大使用量为2g/kg,最低为0.2g/kg。食品中苯甲酸或其盐类的检测方法,目前较常用的有①薄层色谱法,可作为标准定性或概略有限定量;②酸碱滴定法,适用于苯甲酸含量在0.1％以上的试样。低含量的样品,误
Benzoic acid, also known as benzoic acid, is widely used as a preservative in beverages. In the low pH environment, benzoic acid is effective against a wide range of microorganisms, and the optimum P ~ H value for antibacterial activity is 2.5-4. Practical application, less than P ~ H4.5 ~ 5 is appropriate. National standards According to different food varieties, the maximum use of benzoic acid is 2g / kg, a minimum of 0.2g / kg. Food benzoic acid or its salts detection method, the more commonly used are ① thin-layer chromatography, qualitative or quantitative as a standard limited quantitative; ② acid-base titration method for benzoic acid content of more than 0.1% of the sample . Low content of the sample, wrong