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  • 饲料酸化剂的有效总酸度如何体现
  • 本站编辑:杭州果谷生物科技有限公司发布日期:2022-02-18 16:36 浏览次数:

  促进蛋白质消化是饲料酸化剂的首要功能,其实现的先决条件是酸化剂所能提供的H+的数量必须“足够”,所以酸化剂的酸度是饲料酸化剂重要的技术指标。

  酸化剂酸度的表达方式

  饲料酸化剂中所含酸的多少,并无统一的表述方式,目前常用1%水溶液pH值、总酸含量、总酸度和总酸(以乳酸计)这几种方式来表达,其侧重点不同。

  1%水溶液pH值是指1g酸化剂溶解于100g水后,水溶液的pH,对应的是此时水中的H+浓度。由于饲料酸化剂中所用酸原料均为弱电解质,存在解离平衡,1%水溶液的pH值与各种酸原料的解离常数有关,与该酸化剂所能提供的H+并无直接关系。

  总酸含量指的是所有的酸原料在酸化剂成品中所占的比例之和,表示了除去载体和辅材,真正的"酸"在成品中所占的多少,常用HPLC方法进行定量测定。但是由于不同的酸原料所能提供H+的数量存在巨大差异,总酸含量并不能真实反映酸化剂成品中所含的H+的多少。

  总酸度是指酸化剂中所有酸性成分的总量,它包括未离解的酸和已离解的酸,测定方面借鉴了食品中总酸的测定方法(GB/T 12456-2008),其本质是对H+总量的一种度量,反映了该酸化剂中所含H+的多少。

  总酸(以XX酸计)是对总酸度的一种转化,是食品行业的表述习惯。根据食品中所含酸的不同,通常取其中一种主要有机酸计量(通常是乳酸),计算方式如下所示,例如,“以乳酸计”,则乘以乳酸的换算系数K)。总酸(以XX酸计)并非是该种有机酸的真实含量。由于饲料企业很关注酸化剂中以乳酸为代表的有机酸含量,所以产生了“总酸(以乳酸计)”这种表达方式。

Promoting protein digestion is the primary function of feed acidifier, and the prerequisite for its realization is that the amount of H+ provided by acidifier must be "enough", so the acidity of acidifier is an important technical index of feed acidifier.

Expression of acidity of acidifier

There is no unified way to express the amount of acid in feed acidifier. At present, it is commonly used to express the amount of acid in 1% aqueous solution by pH value, total acid content, total acidity and total acid (calculated by lactic acid), with different emphasis.

The pH value of 1% aqueous solution refers to the pH of an aqueous solution after 1g acidifier is dissolved in 100g water, corresponding to the H+ concentration in the water at this time. Due to the weak electrolyte and dissociation equilibrium, the pH value of 1% aqueous solution is related to the dissociation constants of various acid raw materials, but not directly related to the H+ provided by the acidifier.

The total acid content refers to the sum of the proportion of all acid raw materials in the acidifier finished product, indicating the real "acid" in the finished product excluding the carrier and auxiliary materials, which is often quantitatively determined by HPLC method. However, the total acid content does not really reflect the amount of H+ in the final product of acidifier due to the huge difference in the amount of H+ provided by different acid raw materials.

Total acidity refers to the total amount of all acidic components in the acidifier, including the undissociated acid and the dissociated acid. In terms of determination, we refer to the determination method of total acid in food (GB/T 12456-2008), which is essentially a measure of the total amount of H+, reflecting the amount of H+ contained in the acidifier.

Total acid (XX acid) is a transformation of total acidity, is the food industry expression habit. Depending on the acid in the food, one of the major organic acids is usually measured (usually lactic acid) as follows, for example, "by lactic acid", multiplied by the conversion factor K for lactic acid). The total acid (XX acid) is not the true amount of this organic acid. As feed enterprises are concerned about the organic acid content represented by lactic acid in acidifiers, the expression mode of "total acid (measured by lactic acid)" is produced.