Prepared at the 55 th JECFA（2000）and published in FNP 52 Add 8（2000），superseding specifications prepared at the 19 th JECFA（1975），published in NMRS 55B （1976）and in FNP 52（1992）.The 7 th JECFA（1963）had insufficient data to establish an estimate of an acceptable level of treatment of 0-40 mg/kg of flour for human consumption （conditional acceptance for special purposes ：40-75mg/kg ）.

SYNONYMS      Benzoyl superoxide , INS No.928

DEFINITION

Chemical names    Dibenzoyl peroxide

C.A.S.number      94-36-0

Chemical formula    C₁₄H₁₀O₄

Structural formula    

Formula weight      242.23

Assay              Not less than 96.0%

DESCRIPTION      Colourless , crystalline solid having a faint odour of benzaldehyde.

                   Caution :Benzoyl peroxide is a highly reactive compound and may five rise to explosions

FUNCTIONAL USES   Flour treatment agent

CHARACTERISTICS  

IDENTIFICATION

Solubility (FNP 5)     Insoluble in water, slightly soluble in ethanol, soluble in ether

Melting range (FNP 5) 103-106ºwith decomposition

Decomposition to      To 0.5g of the sample peroxide add 5o ml of 0.5 N

benzoic acid        ethanolic potassium hydroxide, heat gradually to boiling and continue boiling for 15min .Cool and dilute with 200ml of water. Add sufficient 0.5N hydrochloric acid to make strongly acidic and extract with ether. Dry the ether solution over anhydrous sodium sulfate, and then evaporate to dryness on a steam bath. The residue of benzoic acid so obtained melts between 121ºand 123º.

PURITY

Lead               Not more than 2mg/kg

                   Determine using an atomic absorption technique appropriate to the specified level. The selecton of sample size and method of sample preparation may be based on the principles of the method described in FNP 5, “Instrumental Methods ”.

METHOD OF ASSAY Dissolve about 250 mg of the sample, accurately

                    Weighed, in 15ml of acetone in a 100-ml glass-stoppered bottle. Add 3 ml of 50% (w/v)