Citric Acid Anhydrous

Description

Citric Acid Anhydrous is used in confectioneries, and food products like biscuits and concentrated juices (solid form)

Applications and Effects

It is mainly used for the purpose of making the juices and also in confectioneries so that the products last longer as 90 days.

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Specifications

TESTS SPECIFICATIONS

Description

Colorless, translucent crystals, or white, granular to fine, crystalline powder. Melts at about 153° C with decomposition.

Solubility

Very soluble in water; Freely soluble in alcohol; very slightly soluble in ether.

Identification

By Infrared absorption.
Dry the substance to be examined at 105° C for 2 hours.

Clarity of solution

The test solution shows the same clarity as that of water.

Color of solution

The test solution is not more intensely colored than standard solution A, B or C, or water.

Water

Not more than 1.0%.

Residue on ignition

Not more than 0.1 % determined on 1.0 g

Readily carbonizable substances

The color of the acid is not darker than that of a similar volume of Matching Fluid K in a matching tube, the tubes being observed vertically against a white background.

Sulfate

Not more than 0.015%

Heavy metals

Not more than 0.001%

Limit of oxalic acid

Not more than 0.036%

Assay

99.5% to 100.5%. (On Anhydrous basis)

TESTS SPECIFICATIONS

Appearance

White or almost white, crystalline powder, colourless crystals or granules.

Solubility

Very soluble in water, freely soluble in ethanol (96 per cent).

Identification

First identification B, E.
Second Identification A,C, D, E.

(A) The solution is strongly acidic.

(B) By IR. Dry the substance to be examined and the reference
substance at 100 - 105° C for 2 h.

(C) A red colour develops.

(D) A white precipitate is formed.

(E) Water.

Appearance of solution

The Solution is clear and not more intensely coloured than reference solution Y7, BY7 or GY7. (Method II )

Readily carbonisable
Substances

The solution is not more intensely coloured than a mixture of 1 ml of red primary solution and 9 ml of yellow primary solution.

Oxalic acid

Not more than 360 ppm.

Sulphates

Not more than 150 ppm

Heavy metals

Not more than 10 ppm

Water

Maximum 1.0 per cent, determined on 2.0 g.

Sulphated ash

Not more than 0.1%, determined on 1.0 g

Assay

99.5 % to 100.5 % , (on Anhydrous basis)

TESTS SPECIFICATIONS

Description

Colourless crystals or a white powder; slightly hygroscopic in moist dry air.

Solubility

Very soluble in water; Freely soluble in ethanol (95%); sparingly soluble in ether.

Identification
(A)

(A)Determine by infrared absorption spectrophotometry.
Compare the spectrum with that obtained with citric acid RS or with the reference spectrum of citric acid. Dry the substance under examination and the reference substance at 1050 for 2 hour.

(B)

Gives reaction A of citrates,
(A) A white precipitate soluble in 6M acetic acid.

(C)

10 percent w/v solution is strongly acidic.

Appearance of solution

The solution is clear and not more intensely coloured than reference solution YS7, BYS7 or GYS7.

Arsenic

Not more than 1 ppm

Barium

Any opalescence produced is not more intense than that of a mixture of 5 ml of solution A and 5 ml of distilled water.

Calcium

Not more than 200 ppm

Heavy metals

Not more than 10 ppm

Iron

Not more than 50 ppm

Chloride

Not more than 50 ppm

Sulphate

Not more than 150 ppm

Oxalic acid

Any pink colour produced is not more intense than that produced by carrying out the test using 0.2ml of oxalic acid dissolved in 4 ml of water.

Readily carbonisable Substances

Any colour produced is not more intense than that of the mixture of 1.0 ml of CCS and 9.0 ml of FCS.

Sulphated ash

Not more than 0.1%

Water

Not more than 1.0%, determined on 2.0 g.

Assay

99.0 % to 101.0 % (On Anhydrous basis)