A kind of preparation method of the gardenia red pigment that tone is firebrick2

Abstract

The invention discloses a method for preparing gardenia red with the tone of Firebrick2. The method includes the steps that sodium hydroxide is added into geniposide liquor with the color value (please see the specification) equal to 2,000, and the mixture is placed at the indoor temperature and reacted to obtain geniposidic acid; then the pH of the geniposidic acid is adjusted to 5.20, beta-glycosidase and L-histidine are added, the mixture is reacted for 72 hours under the 45-DEG C water bath condition, heated to 95 DEG C, subjected to heat preservation for 30 min, inactivated and rapidly cooled to the indoor temperature, and crude gardenia red liquor is obtained; the crude gardenia red liquor is filtered through sheet frame cloth, kieselguhr is added into filter liquor, the mixture is filtered, clear gardenia red liquor is obtained and then fed to an LS-300 resin column to be subjected to adsorption and elution, eluant is subjected to vacuum concentration till the color value (please see the specification) is equal to 25, spraying drying is carried out, and the gardenia red with the R value of 238, the G value of 44, the B value of 44 and the tone of Firebrick2 is obtained. According to the method, the pigment with the specific tone is obtained through the specific technological conditions and the specific raw materials, and a new approach is provided for application and popularization of the gardenia red.

Description

technical field [0001] The present invention relates to a preparation method of gardenia red pigment whose hue is Firebrick2. The gardenia red pigment produced by the method of the invention is a color close to bright red, and it is prepared into a gardenia red pigment liquid with an absorbance value of 0.500 , placed in a colorimetric tube for observation, its R value was 238, its G value was 44, and its B value was 44. Background technique [0002] At present, there are many domestic studies on gardenia red pigment, but most of them are focused on how to prepare gardenia red pigment, and no further research has been done on the hue of gardenia red pigment. For example, the Chinese patent application number is 201110058988.3, ​​and the name is a preparation method of gardenia red pigment. The method uses the resin adsorbed on geniposide as the reaction medium to carry out heterogeneous ester hydrolysis, acidification and enzymatic conversion, and then undergoes acidificatio...

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Problems solved by technology

[0003] However, the above methods are only general studies on the production method and process conditions of the gardenia red pigment, and the gardenia red pigment is prepared by various methods, without further research on the hue of the gardenia red pigment. Research, we have found through research that under different methods and different process conditions, the color of gardenia red pigment prepared is very different, such as bright red, dark red, purple red, deep red, etc.

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