ISO Common Name Chemical Name: Bromadiolone 371
ISO Common Name Chemical Name: Bromadiolone 371
ISO Common Name Chemical Name: Bromadiolone 371
BROMADIOLONE
371
Br
O O
O O
23
BROMADIOLONE 371
BROMADIOLONE TECHNICAL
*
371/TC/M/-
2 Identity test.
HPLC Use the HPLC method below. The retention times of the bromadiolone
diastereoisomers from the sample solution should not differ from those from the
calibration solution by more than 2%.
3 Bromadiolone
OUTLINE OF METHOD Bromadiolone is determined by reversed phase high
performance liquid chromatography using internal standardization.
REAGENTS
Methanol HPLC grade
Phosphoric acid solution c (1/3 H3PO4) = 0.0025 mol/l
Mobile phase. Mix methanol (750 ml) and phosphoric acid solution (250 ml).
Filter through a 0.45 µm filter and degas by placing the mixture in an ultrasonic
bath.
Bromadiolone standard of know purity
Bromadiolone solution. Weigh (to the nearest 0.1 mg) with a weighing device
50 mg pure bromadiolone (s mg) into a volumetric flask (100 ml). Dissolve in
methanol by sonification during 2 min. Let cool to room temperature and fill to
the mark with methanol. Mix well and store in the dark to avoid decomposition.
Tioclomarol [3-(4-chlorophenyl)-3-hydroxy-1-(5-chloro-2-thienyl)]-4-hydroxy-
coumarin, internal standard.
Internal standard solution. Weigh (to the nearest 0.1 mg) with a weighing
device 50 mg tioclomarol (r mg) into a volumetric flask (100 ml). Dissolve in
methanol by sonification during 2 min. Let cool to room temperature and fill to
the mark with methanol. Mix well and store in the dark to avoid decomposition.
Calibration solution. Transfer by a pipette 10 ml of the bromadiolone and 10 ml
of the internal standard solution to a volumetric flask (100 ml). Dilute to the
mark with mobile phase and mix well. Store in the dark to avoid decomposition.
In natural light a loss of 5% per hour may occur. In the dark the solution is
stable for 24 h.
*
CIPAC method 1991. Prepared by PAC-France; Chairman: B Declercq. Based on a method supplied by Lipha
SA, France.
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BROMADIOLONE 371
APPARATUS
PROCEDURE
(b) Preparation of sample solution. Weigh (to the nearest 0.1 mg) with a weighing
device enough sample to contain about 50 mg (w mg) pure bromadiolone into a
volumetric flask (100 ml). Dissolve in methanol by sonification for 2 min. Let cool
to room temperature and fill the mark with methanol. Mix well. Transfer by pipette
10 ml of this solution and 10 ml of internal standard solution to a volumetric flask
(100 ml). Dilute to the mark with mobile phase and mix well. Store in the dark to
avoid decomposition.
(c) Determination. Inject 20 µl portions of the calibration solution until the
response ratio of the bromadiolone peak relative to the internal standard peak
agrees within 1% for successive injections. Then inject in duplicate portions of
the sample solution followed by another calibration solution injection. Measure
the areas of the relevant peaks. Calculate the response factors (f) from the
calibration solution injection preceding and following the injections of the
sample solution. Average the values obtained.
(d) Calculation
Ir s P
f
Hs
Hw r f
Content of bromadiolone g/kg
Iq w
25
BROMADIOLONE 371
where:
Hs = sum of the areas of the bromadiolone peaks in the calibration solution
Ir = area of the internal standard peak in the calibration solution
Hw = sum of the areas of the bromadiolone peaks in the sample solution
Iq = area of the internal standard peak in the sample solution
s = mass of bromadiolone in the calibration solution
r = mass of internal standard in the calibration and sample solutions (mg)
w = mass of sample taken (mg)
f = response factor
P = purity of the bromadiolone standard (g/kg)
*
CIPAC method 1991. Prepared by PAC-France; Chairman: B Declercq. Based on a method supplied by Lipha
SA, France.
26
BROMADIOLONE 371
Hw r f
Content of bromadiolone g/kg
I q w 10
*
CIPAC method 1991. Prepared by PAC-France; Chairman: B Declercq. Based on a method supplied by Lipha
SA, France.
27