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Red pigment of lac of additive agent for food
From;    Author:Stand originally
GB 4571-84 of additive agent for food of level of state of People's Republic of China
Lac red pigment
Food Additive Lac Dye
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This standard applies to the lac red element that uses production of calcic salt law for raw material with lac. Can regard food as colorant.

1 technology asks
1.1 exteriors
This tasting for vermeil powder.
1.2 granuality
Taste 80 eye originally 100 % are passed.
1.3 projects and index
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Project ┃ index
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Dry weightlessness, % ≤ ┃ 10
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Calcination is residual, % ≤ ┃ 0.8
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Aqueous solution PH is worth, ┃ of PH ≥ 3
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┃ of 0.01 % solution
Absorbance (┃ of ≥ of E) 0.62
┃ of 0.5cm colorimetric Min
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Lead (Pb) , % ≤ ┃ 0.0005
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Copper (Cu) , % ≤ ┃ 0.0015
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Arsenic (As) , % ≤ ┃ 0.0002
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Mercuric (Hg) , % ≤ ┃ 3E-5
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2 experiments method
Divide special outside making clear, the place in the experiment is analytic pure reagent with reagent, water is the water of distilled water or corresponding purity, solution is Shui Rong
Fluid, instrument equipment is equipment of general lab instrument.
2.1 exteriors reach size
Say to take 20g sample, observe color with naked eye, appearance of 80 eye cent sifts reoccupy determine.
2.2 differentiate
Lac red pigment is the mixture of natural organic acid, the solubility when 20 ℃ is 0.0335g, in the solubility in 95 % alcohol
For 0.916g, yi Rong changes sodium solution at bicarbonate natrium, sodium carbonate and oxyhydrogen in, in PH the value is more than the solution of 6 in easy with alkali metal
The metallic ion besides generates water not the lake of dissolve sex. The color of its solution is worth change along with PH and change, PH value is less than 4 for orange
Yellow, PH is worth 4 ~ 5 for nacarat, PH value is more than 6 for amaranth.
Of 2.3 dry weightlessness determine
2.3.1 determine formalities
Say sample thief 3g(says to allow to come 0.0002g) , park already was in 2 ℃ of 105 ± carbonado inside the metage bottle to constant weight, park 2 ℃ of 105 ± carbonado
In box, carbonado to constant weight.
The expression of 2.3.2 computation and result
Dry weightlessness X1(expresses with weight percentage) by type (1) computation:
(G1 - G2)
X1(% ) = -- -- ━ × 100... ... ... ... ... ... ... ... (1)
G
In type: G1 -- metage bottle adds sample to weigh, g;
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