ISO 17494:2001 pdf download

ISO 17494:2001 pdf download.Aromatic extracts, flavouring and
perfuming compounds – Determination ofethanol content- Gas chromatographic method on packed and capillary columns.
The method is applicable to those products having presumed ethanol contents over 0.5 %.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of. any of these pubhcations do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies, Members of ISO and IEC maintain registers of currently valid International Standards.
ISO 760, Determination of water — lCad Fischer method (General method)
ISO 7359, Essential oils — Analysis by gas chromatography on packed columns — General method
ISO 7609. Essential oils — Analysis by gas chromatography on capiUa’y columns — General method
3 Term and definition
For the purposes of this International Standard, the following term and definition apply.
3.1
aromatic extracts, flavourIng and perfuming compounds
liquid or diluted aromatic products, with the exclusion of dry aromatic substances (such as spices)
4 Principle
Aromatic extracts and flavouring and perfuming compounds are analysed by gas chromatography, either on a packed column or a capillary column, under specified conditions.
Their ethanol content is determined using the internal standard method.
7.2 Flow rates of carrier gas and auxiliary gases
See ISO 73.59 or ISO 7609.
8 Column performances
8.1 Chemical Inertness test
Carry out the test as specified In ISO 7359 or ISO 7609.
8.2 Column efficiency
Determine the efficiency of the column as specified in ISO 7359 or ISO 7609.
9 internal standard method
9.1 DeterminatIon of the response factor
Determine the response factor relative to the internal standard as specified in ISO 7359 or ISO 7609.
9.2 DeterminatIon of ethanol In the sample
Carry out the determination of the ethanol content In accordance with the method specified In ISO 7359 or
ISO 7609.
In the case of viscous samples, first dilute in the solvent descnbed in 53.
10 Expression of results
See ISO 73.59 or ISO 7609.
NOTE Typical chromatograms of the analysis are given in annex A, br information.
11 Precision
11.1 Interlaboratory test
Details of an interlaboratory test on the precision of the method are summarized in annex B. The values derived
from this Interlaboratory test may not be applicable to concentration ranges arid matnces other than those given. 11.2 RepeatabIlIty
The absolute difference between two independent single test results, obtained using the same method on identical lest material in the same laboratory by the same operator using the same equipment within a short interval of time, will in not more than 5 % of cases be greater than 5 %.
11.3 Reproducibility
The absolute difference between Iwo single test results. obtained using the same method on identical test material in different laboratones with different operators using different equipment, will in not more than 5 % of cases be greater than 10 %.
12 Test report
See ISO 7359 or ISO 7609.