Bright blue, also known as edible cyan No. 1 and edible blue No. 2, is a water-soluble non azo colorant.It is an organic compound with molecular formula Cthirty-sevenHthirty-fourNtwoNatwoOnineSthree，relative molecular mass792.84。[1]Bright blue is an edible blue pigment, which belongs to artificial synthesispigmentIt is prepared by condensation and oxidation of benzaldehyde o-sulfonic acid and N-ethyl-N - (3-sulfobenzyl) - aniline.[2]It can be used in food, medicine, cosmetics and other industriesColorantUse.It is suitable for coloring cakes, candies, drinks, etc. in the food industry.[1]
Bright blue means yesMetallic lusterDeep purple to bronze particles or powder, odorless, metallic luster.Soluble inwater(18.7g/100mL, 21 ℃), the aqueous solution is bright blue, weakacidicWhen it is green,strong acidYellowish when sexual, boilingLyeMedium purple.Also soluble inethanol(1.5g/100mL, 95% ethanol, 21 ℃), propylene glycol andglycerol。Light resistance, heat resistance, acid resistance, salt resistance and microbial resistance are very good, but their aqueous solution will slowly occur after adding metal saltsprecipitate。It can be decomposed by bacteria.Alkali resistance and redox resistance are better.[1][4-5]
performance
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Bright blue has a very strong chromaticity. It is usually used in combination with other food pigments, and the amount used in food is generally 0.0005% - 0.01%（mass fraction ）。It can be used for beverage, candy, processing nuts, cooked beans, canned food, pastry, etc.The maximum dosage is 25 mg/kg.[5]
Safety: the daily allowable human intake is 0-12.5mg/Kg.[5]
Preparation method
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Brilliant blue can be prepared by condensation of benzaldehyde o-sulfonic acid with ethyl benzyl aniline sulfonic acid, and then using sodium dichromate orLead dioxideIt is oxidized into pigment, neutralized, salted out with sodium sulfate, and refined.[6]
the way to distinguish
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(1) Take 0.1g of the product and dissolve it in 100mL of water, presenting a blue clear solution.This product is slightly soluble in ethanol, insoluble in oil, has the characteristics of acid dyes, and can makeAnimal fibreto color.[7]
(3) The maximum absorption wavelength of 0.02mol/L ammonium acetate solution containing 0.001g of this product in 100mL is 630 ± 2nm.[7]
(4) Take the aqueous solution of the product and do paper chromatographyfThe value should be the same as the standard.[7]
Rising limit of developing agent front edge: 160mm[7]
Toxicity and safety
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1. This product is proved to be safe by animal test;[1]
2. Oral LD in ratsfifty>2g/Kg。ADI：0-12.0mg/Kg（bw）。Rats were fed with diets containing 0.5%, 1%, 2% and 5% for 24 months, and no abnormal changes were found.[1][8]
Usage suggestions
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According to the provisions of GB 2760-2011 National Food Safety Standard for the Use of Food Additives, the maximum amount used for fruit flavored drinks (liquid and solid), fruit juice drinks, soft drinks, prepared wine, candy, color packaging of pastries, red and green silk, cans, concentrated fruit juice, green plum, and shrimp slices is 0.025g/kg;For ice cream, the maximum dosage is 0.021999g/kg.The amount of red and green silk can be doubled, and the fruit flavor powder colorant shall be added at 50% of the dilution ratio.[1]
According to FAO/WHO (2001), the maximum use amount of green bean cans and cold drinks is 0.1g/kg;The maximum usage of apple sauce, canned peas, jam and jelly is 02g/kg；Pickled cucumber, the maximum dosage is 0.3g/kg.[1]
Because of its strong chromaticity, this product is low in dosage, and is usually used together with other colorants.[1]
