GB/T 35837-2018 PDF English
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Determination of prohibited minoxidil in cosmetics -- High performance liquid chromatography
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GB/T 35837-2018: PDF in English (GBT 35837-2018) GB/T 35837-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.70
Y 42
Determination of Prohibited Minoxidil in Cosmetics -
High Performance Liquid Chromatography
ISSUED ON. FEBRUARY 06, 2018
IMPLEMENTED ON. SEPTEMBER 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative References ... 5
3 Principle ... 5
4 Reagents and Materials ... 5
5 Apparatus ... 6
6 Analytical Procedures ... 6
7 Result Calculation ... 8
8 Detection Limit and Quantitative Limit... 8
9 Recovery Rate and Precision ... 8
10 Allowable Difference ... 8
Appendix A (Informative) Structural Formula, High-Performance Liquid
Chromatogram and UV Absorption Spectrum of Minoxidil Standard Substance
... 9
Appendix B (Informative) Confirmation Test ... 11
Determination of Prohibited Minoxidil in Cosmetics -
High Performance Liquid Chromatography
1 Scope
This Standard specifies the high-performance liquid chromatography for the
determination of prohibited substance of minoxidil in the cosmetics.
This Standard is applicable to the determination of minoxidil in the cosmetics, such as
emulsions, creams, lotions and shampoos with hair care and growth functions.
This Standard’s detection limit of minoxidil is 5mg/kg; while the quantitative limit is
10mg/kg.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
3 Principle
The specimen is ultrasonically extracted by the solvent; after centrifuging, determine
by high performance liquid chromatography; quantify by external standard method;
confirm by liquid chromatography-mass spectrometry.
4 Reagents and Materials
Unless otherwise stated, all the used reagents are analytical reagents; while the used
water shall be Class-I water specified in GB/T 6682.
4.1 Methanol. chromatographically pure.
4.2 Trifluoroacetic acid. chromatographically pure.
6.1.2 Lotion and shampoo samples
Take 0.5g (accurate to 0.001g) of specimen; place it into 10mL stoppered plastic
centrifuge tube (5.6); add 10mL of 70% methanol aqueous solution (4.5); shake;
perform ultrasonic extraction for 20min; after centrifuging for 15min at 5000r/min, filter
the supernatant by the 0.45µm microporous membrane; then determine by the high-
performance liquid chromatography.
6.2 Determination condition
The HPLC reference conditions are as follows.
a) Chromatographic column. C18, 5µm, 250mm×4.6mm (inner diameter), or the
equivalent;
b) Flow rate. 1.0mL/min;
c) Mobile phase. methanol + 0.3% trifluoroacetic acid aqueous solution = 45 + 55
(volume ratio);
d) Detection wavelength. 230nm;
e) Column temperature. 30°C;
f) Sample-injecting volume. 10µL.
6.3 Drawing of the standard curve
Use 70% methanol aqueous solution (4.5) to dilute the minoxidil standard stock
solution (4.6) grade by grade into the standard working solutions with concentrations
of 0.5mg/L, 1mg/L, 2mg/L, 5mg/L, 10mg/L, and 20mg/L; inject sample and measure
according to the low-to-high concentrations of the determination conditions in 6.2; take
peak area-concentration as diagram to draw standard working curve.
The high-performance liquid chromatogram of the minoxidil standard substance can
refer to Figure A.2 in Appendix A; while the UV absorption spectrum of the minoxidil
standard substance can refer to Figure A.3 in Appendix A.
6.4 Determination
Determine the to-be-tested sample as per the determination conditions in 6.2; if the
retention time of the chromatographic peak of the detected minoxidil is consistent with
the standard substances; in the chromatogram of the sample after subtracting the
background, the UV absorption spectrum with such substance is consistent with the
standard substance; then it can be preliminarily determined that the minoxidil is present
in the sample; use the external standard method to quantify. The minoxidil content shall
be within the standard curve; if the linear range is exceeded, then dilute it and analyze.
Appendix B
(Informative)
Confirmation Test
B.1 Liquid chromatography conditions
The reference conditions of liquid chromatography determination are as follows.
a) Chromatographic column. XBridge C18, 3.5µm, 150mm×2.1mm (inner diameter),
or the equivalent;
b) Mobile phase. 0.1% formic acid solution + acetonitrile = 10+90 (volume ratio);
c) Flow rate. 0.4mL/min;
d) Column temperature. 40°C;
e) Sample-injecting volume. 5µL.
B.2 Mass spectrometry conditions
The reference conditions of mass spectrometry determination are as follows.
a) Ion source. electrospray ion source;
b) Ionization mode. positive ion mode;
c) Capillary voltage. 3kV;
d) Extraction voltage. 3V;
e) Ion source temperature. 150°C;
f) De-solvent gas. nitrogen;
g) De-solvent gas flow rate. 800L/h;
h) De-solvent gas temperature. 500°C;
i) Data collection method. multiple reaction monitoring (MRM).
B.3 Qualitative determination
When measuring the sample solution, appropriately dilute it; measure the sample
solution and standard working solution as per the determination conditions of liquid
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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