AO2

AO2 - Names and Identifiers

Name	Food Blue 1:1
Synonyms	AO2 Blue 1 Lake Blue 2 Lake ACID BLUE 74 ALUMINUM LAKE Aluminum, 2-(1,3-dihydro-3-oxo-5-sulfo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-1H-indole-5-sulfonic acid complex
CAS	16521-38-3
EINECS	240-589-3

AO2 - Physico-chemical Properties

Molecular Formula	C37H36N2O9S3·xAl
Molar Mass	748.8827
Storage Condition	Room Temprature
MDL	MFCD00198070
Physical and Chemical Properties	A fine cyan powder with purple chemical properties. No smell. Several insoluble in water and organic solvents (0.001% ~ 0.01%). Light resistance and heat resistance are stronger than indigo.
Use	Uses of edible blue pigment. Used alone or in combination with powder food, fat products, sugar-coated cakes, etc. Because aluminum lakes become soluble under acidic and alkaline conditions, their use is limited. It is also used in food packaging materials, printing ink, toys, tableware and other coloring.

AO2 - Upstream Downstream Industry

Raw Materials	Sodium carbonate Aluminum hydroxide Aluminum sulfate Indigo Alkali Metals, plasma standard solution, Specpure, Ba,Be,Ca,Cs,K,Li,Mg,Na,Rb,Sr, 100μg\|ml Indigo
Downstream Products	Indigo Erioglaucine disodium salt Indigo Carmine ALLURA RED AC Amaranth red aluminium lake Fancy red aluminium lake

AO2 - Nature

EPA chemical information

C. I. Pigment Blue 63 (16521-38-3)

Last Update：2024-04-09 01:59:50

AO2 - Uses and synthesis methods

identification test

take 0.1g of sample, add 5ml of dilute sulfuric acid test solution (TS-241), mix thoroughly, use 0.02mol/L, ammonium acetate solution to constant volume to 100ml. If the liquid is opaque, centrifugal separation is performed. Take l ~ 10ml of this solution (the amount shall be subject to the measured absorbance in the range of 0.2~0.7), and then use 0.02 mol/L ammonium acetate solution to fix the volume to 100ml. This liquid has a maximum absorption peak at a wavelength of 612nm ± 2nm.

take sample 0.1g; Add 5ml of 10% sodium hydroxide solution, shake and heat for about 5min in a water bath to dissolve it, and it should be nearly transparent yellowish brown. After cooling and neutralizing with dilute hydrochloric acid test solution, it should be purple blue to light green, and produce gel-like precipitate of the same color.

take 0.1g of sample, add 5ml of sulfuric acid, and heat it for about 5min while stirring in a water bath. it should be dark purple blue. Cooling, take 2~3 drops of supernatant and add it to 5ml of water, which should be purple blue.

take 0.1g of sample, add 10ml of dilute hydrochloric acid test solution, and heat in water bath until most of it is dissolved. Add 0.5g activated carbon, fully shake and filter, neutralize the colorless filtrate with 10% sodium hydroxide solution, and the aluminum salt test (IT-2) is positive.

in addition, if ammonium chloride test solution (TS-20) and ammonia test solution (TS-13) are added, white gel-like precipitate will be generated, and even if excessive ammonia test solution is added, the precipitate will not dissolve.

content analysis

according to the content analysis method in "amaranth red aluminum lake (17005). Accurately weigh the sample in such a way that the consumption of 0.1mol/L titanium trichloride solution is about 20ml. 15g sodium hydrogen tartrate was used instead of 15g sodium citrate. 0.1mol/L titanium trichloride solution per ml is equivalent to 21.12mg of this product (C16H10N2O8S2).

Toxicity

ADl 0~5 mg/kg(FAO/WHO,1984).

use limited

GB 2760-96: Same as ": 17040, Indigo".

production method

1. Aluminum hydroxide is obtained by reacting aluminum salt of aluminum sulfate, aluminum chloride, etc. with alkali metal salt of sodium carbonate, etc., and is added to indigo aqueous solution to precipitate.

2. aluminum lake is formed by reacting pigment substance with alumina in aqueous solution. Alumina is an undried product just prepared after the reaction of aluminum sulfate or aluminum chloride with sodium carbonate or sodium bicarbonate or ammonia. After the lake is formed, it is filtered, washed with water and dried.

Last Update：2024-04-09 18:58:34