Method for preparing rdish red pigment and radish phenyl-isosulfo cyanate
A technology of isothiocyanate and radish red, applied in the field of natural pigments, can solve the problems of affecting environmental protection, affecting product quality, long production cycle, etc., reducing the discharge of waste and waste water, being conducive to environmental protection and saving The effect of resources and energy
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Embodiment 1
[0048] The steps of a preparation method of radish red pigment and radish isothiocyanate are as follows:
[0049] (1) Preparation of radish red pigment solution
[0050] ① Preparation of crude extract
[0051] Add 100g of "Xinxinmei" radish to 1000mL of distilled water, grind it, heat it to 50°C, and keep it for 60min, then squeeze it with 8 layers of gauze until no juice is drained. Remove the radish residue, heat the filtrate to boiling and keep it for 10 minutes, then filter the filtrate with diatomaceous earth, and finally cool the filtrate to room temperature to prepare the crude extract of radish red pigment;
[0052] ②Preparation of fine extract
[0053] After the crude extract of radish red pigment prepared in step ① is ultra-filtered through an ultra-concentrated membrane with a cut-off molecular weight of 6000Da, the retained filtrate has an isothiocyanate content of 0.035%, a radish red pigment content of 0.65%, The radish red pigment essence extract with ash con...
Embodiment 2
[0077] The steps of a preparation method of radish red pigment and radish isothiocyanate are as follows:
[0078] (1) Preparation of radish red pigment solution
[0079] ① Preparation of crude extract
[0080] Add 100g of "Xinxinmei" radish to 1200mL of distilled water, grind it, heat it to 60°C, and keep it for 80min, then press it with 8 layers of gauze until no juice is drained. Remove the radish residue, heat the filtrate to boiling and keep it for 15 minutes, then filter the filtrate with diatomaceous earth, and finally cool the filtrate to room temperature to prepare a crude extract of radish red pigment;
[0081] ②Preparation of fine extract
[0082] After the crude extract of radish red pigment prepared in step ① is ultra-filtered through an ultra-concentrated membrane with a cut-off molecular weight of 6000Da, the retained filtrate has an isothiocyanate content of 0.03%, a radish red pigment content of 0.45%, 0.26% ash content of radish red pigment essence extract;...
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