| 摘要 |
PROBLEM TO BE SOLVED: To easily and quickly inspect the stabilizable pH area of a stabilizer by adding the stabilizer to an aqueous solution of skimmilk powder pH-adjusted to acidic area followed by uniform mixing; and then raising the pH of the mixed solution to measure the pH value when the viscosity is suddenly changed. SOLUTION: An aqueous solution of skimmilk heated and sterilized is adjusted to a prescribed pH by adding gluconol-δ-actone, and a yogurt-like card is prepared. This card is homogenized by use of a refining device such as a high pressure homogenizer. A preliminarily prepared stabilizer solution is mixed to the resulting homogenized product, and homogenization is again performed. A sweetener is added thereto to have the sugar concentration of drink yougurt. The stabilizer is selected, for example, from pectin. The prepared drink yogurt-like solution (measuring solution) is adjusted to a prescribed pH by use of acid or alkali. An alkaline aqueous solution is gradually added to the resulting measuring solution, and the pH when the viscosity of the measuring solution is suddenly raised is set as the upper limit pH capable of stabilizing the drink yogurt. |
