GB/T 14454.2-2008 PDF English (GB/T 14454.2-1993: Older version)
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Fragrance/Flavor substances - Method for valuation of odour
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| GB/T 14454.2-1993 | English | 199 |
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Aromatics. Method for valuation of odor
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GB/T 14454.2-2008: PDF in English (GBT 14454.2-2008) GB/T 14454.2-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.60
Y 41
Replacing GB/T 14454.2-1993
Fragrance/Flavor substances - Method for valuation of odour
ISSUED ON. JULY 15, 2008
IMPLEMENTED ON. DECEMBER 1, 2008
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
Method I -- The triangle valuation method ... 5
2 Terms and definitions ... 5
3 Principle ... 6
4 Preparation prior to valuation ... 6
5 Operating procedures ... 8
6 Expression of results ... 9
Method II -- Paired comparison test method ... 10
7 Principle ... 10
8 Standard sample, solvent and fragrance blotter ... 10
9 Operating procedures ... 11
10 Expression of results ... 12
Foreword
GB/T 14454, Fragrance/Flavor substances - General test methods, comprises the
following parts.
-- Part 1. Fragrance/Flavor substances - Preparation of test samples;
-- Part 2. Fragrance/Flavor substances - Method for valuation of odour;
-- Part 4. Fragrance/Flavor substances - Determination of refractive index;
-- Part 5. Fragrance/Flavor substances - Determination of optical rotation;
-- Part 6. Fragrance/Flavor substances - Quantitative evaluation of residue on
evaporation;
-- Part 7. Fragrance/Flavor substances - Determination of freezing point;
-- Part 11. Fragrance/Flavor substances - Determination of content of phenols;
-- Part 12. Fragrance/Flavor substances - Method for determination of trace
chlorinated compounds;
-- Part 13. Fragrance/Flavor substances - Determination of carbonyl value and
carbonyl compounds content;
-- Part 14. Fragrance/Flavor substances - Preparation of standard solution test
solution and indicator solution;
-- Part 15. Oil of sassafras - Determination of safrole and isosafrole content - Gas
chromatographic method on packed columns.
This Part is Part 2 of GB/T 14454.
This Part is a revision of GB/T 14454.2-1993, Fragrance/Flavor substances - Method
for valuation of odour. Compared with GB/T 14454.2-1993, the major change of this
Part is the addition of the method of triangle valuation.
GB/T 14454.2-1993 adopts the paired comparison test method. It is finally determined
by the valuators giving valuation scores whether the sample is good, fair, qualified and
unqualified. The advantage of the method is that it is simple and will not cause sensory
fatigue easily, but the disadvantage is that the vulnerable valuators are easily mislead
by the experts and unable to make their own choices, when the know samples are
compared.
In this Part, in addition to the paired comparison test method, we also refer to the
triangle valuation method and the three-point test method in related sensory analysis
method which are implemented by many enterprises at present. The odour of
Fragrance/Flavor substances - Method for valuation of odour
1 Scope
The first method of this Part of GB/T 14454 specifies the triangle valuation method to
valuate and determine the differences between the odours of sample to be tested and
standard sample, which applies to the routine control of the odours of fragrance/flavor
substances.
The second method of this Part specifies the paired comparison test method to valuate
and determine the differences between the odours of sample to be tested and standard
sample, which applies to the routine control of the odours of fragrance/flavor
substances.
Method I -- The triangle valuation method
2 Terms and definitions
For the purposes of this Part of GB/T 14454, the following terms and definitions apply.
2.1
method of triangle valuation
Mark 4 fragrance blotters respectively; use 2 fragrance blotters to dip in sample to be
tested; use another 2 fragrance blotters to dip in standard sample; and then mix the 4
fragrance blotters together. Take one and reserve 3 randomly and let the valuators to
find the fragrance blotter whose odour is different.
2.2
wet method
The valuation of fragrance blotters which are prepared just a short moment ago (within
10 min after being dipped in sample), is called wet method.
2.3
dry method
The valuation of fragrance blotters which are prepared a relatively long time ago (after
30 min, within 48 h), is called dry method.
5 Operating procedures
5.1 Liquid fragrance/flavor substances
5.1.1 The presider shall first ensure the valuation environment is as specified and
then notify the members of the valuation team. The time is preferably the middle period
of the morning or afternoon.
5.1.2 Prepare standard sample and sample to be tested (samples may be poured
into a clean container without a peculiar odour). Fragrance blotters for the dry method
may be prepared in advance.
5.1.3 The presider uses particular codes/symbols to mark at the ends of 4 fragrance
blotters which are not dipped in samples.
5.1.4 Take 2 marked fragrance blotters to immerse into standard sample about 1 cm
to take some liquid; try to scrape away excessive sample liquid at the mouth of
standard sample; and do not place the ends dipped into sample liquid vertically upward
after taking the fragrance blotters out, to avoid excessive sample liquid flowing
downwards. The presider records their codes/symbols.
5.1.5 Take 2 marked fragrance blotters to dip into sample to be tested with the height
of dipping into sample liquid identical to that into standard sample. The presider
records their codes/symbols.
If the same height of dipping can not be obtained, it is preferable to dip the 4 fragrance
blotters independently and avoid the valuators from identifying at the height of dipping
sample liquid. If visible chromatic aberration occurs on the fragrance blotters of the two
samples, turn the light down in the valuation room.
5.1.6 The presider mixes the four fragrance blotters dipped into samples crossly; and
during the process, avoid mutual contact and cross contamination of the ends dipped
into samples.
5.1.7 During valuation, attention is drawn to that the distance from the fragrance
blotters to the nose is maintained at 1 cm ~ 2 cm; do not let the fragrance blotters
contact the nose; and inhale slowly. When the valuators feel olfactory fatigue, they may
smell their own sleeve.
5.1.8 The sample liquid of one of the remaining three fragrance blotters is certainly
from the different sample. The valuators shall find the fragrance blotter having the
different odour in accordance with their own olfactory sense.
5.1.9 If the valuation team carry out valuation together, the valuators shall not discuss
with each other during the valuation process; and it needs to carry out 3 rounds of
dipping and valuation for the same group of standard sample and sample to be tested.
Each valuator needs to find the fragrance blotter having the different odour once within
made from different materials or the synthetic which is made through different process
routes; and those of different specifications.
Standard sample shall be jointly determined by the technical and quality inspection
departments of the enterprise and/or the customer.
Standard sample shall be stored in a clean, dry, closed inert container, which is fully
filled (or filled with nitrogen), kept from sunlight and prevented from odour
contamination; and it shall comply with the requirements of relevant departments.
8.2 Solvents
If necessary, select ethyl alcohol, benzyl alcohol, benzyl benzoate, diethyl phthalate,
isopropyl myristate or water as the solvents in accordance with different
fragrance/flavor types.
8.3 Fragrance blotter
Use clean, contamination-free fragrance blotters. Use good quality odourless,
absorbent paper (of thickness about 0.5 mm); an...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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