o-PHENYLPHENOL-邻-苯基苯酚
o-PHENYLPHENOL
Prepared at the 8th JECFA (1964), published in NMRS 38A (1965) and in
FNP 52 (1992). Metals and arsenic specifications revised at the 63rd
JECFA (2004). An ADI of 0-0.2 mg/kg bw was established at the 8th JECFA
(1964)
SYNONYMS Orth...
o-PHENYLPHENOL
Prepared at the 8th JECFA (1964), published in NMRS 38A (1965) and in
FNP 52 (1992). Metals and arsenic specifications revised at the 63rd
JECFA (2004). An ADI of 0-0.2 mg/kg bw was established at the 8th JECFA
(1964)
SYNONYMS Orthoxenol; INS No. 231
DEFINITION
Chemical names (1,1'-Biphenyl)-2-ol, 2-hydroxydiphenyl, o-hydroxydiphenyl
C.A.S. number 90-43-7
Chemical formula C12H10O
Structural formula
Formula weight 170.20
Assay Not less than 98%
DESCRIPTION White, slightly yellow or pink flaky crystals or solid, having a mild
characteristic odour
FUNCTIONAL USES For the post-harvest treatment of fruits and vegetables to protect against
microbial damage
CHARACTERISTICS
IDENTIFICATION
Solubility (Vol. 4)
Practically insoluble in water, very soluble in ethanol
Melting point (Vol. 4)
About 57o
Test for phenol An ethanolic solution (1 g in 10 ml) produces a green colour upon addition
of 10% ferric chloride solution
PURITY
Total ash (Vol. 4)
Not more than 0.05%
Lead (Vol. 4) Not more than 2 mg/kg
Determine using an atomic absorption technique appropriate to the
specified level. The selection of sample size and method of sample
preparation may be based on the principles of the method described in
Volume 4, “Instrumental Methods.”
METHOD OF
ASSAY
Weigh 2.000 g of o-phenylphenol, dissolve in 10 ml of 10% sodium
hydroxide solution by warming and dilute to 500.0 ml. Pipette 25.0 ml into a
250-ml iodine flask and add 30.0 ml of 0.1 N bromide-bromate TS and 50 ml
of anhydrous methanol. Place the stopper in the flask and add 10 ml of
dilute (1 to 1) hydrochloric acid to the well. Raise the stopper slightly to
allow the acid to flow down the sides inside the flask, but retain a small
amount of the acid in the well to act as a seal. Mix the contents by swirling
and allow it to react for exactly 30 sec at 25±5o. Immediately add 10 ml of
20% potassium iodide solution to the well and allow it to drain into the assay
flask as for the acid. Mix well, allow the solution to stand for 5 min, shaking
occasionally. Wash the stopper and the sides of the flask with water. Titrate
the liberated iodine with 0.1 N sodium thiosulfate adding starch TS as the
endpoint is approached. Each ml of 0.1 N bromide-bromate TS consumed is
equivalent to 4.255 mg of C12H10O.
o-PHENYLPHENOL
SYNONYMS
DEFINITION
Chemical names
C.A.S. number
Chemical formula
Structural formula
Formula weight
Assay
DESCRIPTION
FUNCTIONAL USES
CHARACTERISTICS
IDENTIFICATION
Test for phenol
PURITY
Lead (Vol. 4)
METHOD OF ASSAY
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