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  • 飼料酸化劑的有效總酸度如何體現
  • 本站編輯:杭州果谷生物科技有限公司發布日期:2022-02-18 16:36 瀏覽次數:

  促進蛋白質消化是飼料酸化劑的首要功能,其實現的先決條件是酸化劑所能提供的H+的數量必須“足夠”,所以酸化劑的酸度是飼料酸化劑重要的技術指標。

  酸化劑酸度的表達方式

  飼料酸化劑中所含酸的多少,并無統一的表述方式,目前常用1%水溶液pH值、總酸含量、總酸度和總酸(以乳酸計)這幾種方式來表達,其側重點不同。

  1%水溶液pH值是指1g酸化劑溶解于100g水后,水溶液的pH,對應的是此時水中的H+濃度。由于飼料酸化劑中所用酸原料均為弱電解質,存在解離平衡,1%水溶液的pH值與各種酸原料的解離常數有關,與該酸化劑所能提供的H+并無直接關系。

  總酸含量指的是所有的酸原料在酸化劑成品中所占的比例之和,表示了除去載體和輔材,真正的"酸"在成品中所占的多少,常用HPLC方法進行定量測定。但是由于不同的酸原料所能提供H+的數量存在巨大差異,總酸含量并不能真實反映酸化劑成品中所含的H+的多少。

  總酸度是指酸化劑中所有酸性成分的總量,它包括未離解的酸和已離解的酸,測定方面借鑒了食品中總酸的測定方法(GB/T 12456-2008),其本質是對H+總量的一種度量,反映了該酸化劑中所含H+的多少。

  總酸(以XX酸計)是對總酸度的一種轉化,是食品行業的表述習慣。根據食品中所含酸的不同,通常取其中一種主要有機酸計量(通常是乳酸),計算方式如下所示,例如,“以乳酸計”,則乘以乳酸的換算系數K)??偹?以XX酸計)并非是該種有機酸的真實含量。由于飼料企業很關注酸化劑中以乳酸為代表的有機酸含量,所以產生了“總酸(以乳酸計)”這種表達方式。

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.


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