| 摘要 |
<p>A method for the production of a vitamin-A containing cream comprising the following steps: a) a first mixture-consisting of a number of water-soluble substances such as glycerine and extracts of plants- is mixed together during heating and comminution until the mixture has a temperature of about some 80° C, preferable 83° C, b) a second mixture consisting of a number of oil-soluble substances, including emulsifiers, and squalane and vegetable oils such as avocado oil are mixed together during heating until the mixture has a temperature of about some 80° C, preferable 83° C, c) said first mixture is then gradually added to said second mixture during high-shear-mixing with decreasing number of revolutions - from about 5000 rpm to about 3300rpm - until the temperature of the mixture slowly has decreased to about some 50° C, preferable 51° C, d) said last mixture is then added a third mixture containing of alpha.tocopherol, tocopherol acetate, retinyl palmitate and retinyl acetate preferably in the following mutual relation 10 :50 : 61 : 58 - determined in accordance with the used mixture of vitamines, e) the final mixture is then successively homogenized at a pressure of about 1000 bar and then kept at constants temperature of some 50° C, until the whole mixture is homogenized, whereafter the mixture is high-shear-mixed with decreasing number of revolution until the temperature is about some 40° C, preferable 45° C, f) finally, the viscosity of the cream is adjusted by stirring.</p> |
