Standard Practice for Bulk Sampling, Handling, and Preparing Edible Vegetable Oils for Sensory Evaluation

SCOPE
1.1 This practice covers the recommended procedures for bulk sampling, handling, and preparing edible vegetable oil (liquid at room temperature) prior to sensory evaluation.
1.2 This practice is consistent with the background information presented in ASTM STP433, ASTM STP434, and ASTM STP758. These should be consulted for supplemental guidance.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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Historical
Publication Date
31-Dec-1999
Current Stage
Ref Project

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ASTM E1346-90(2000) - Standard Practice for Bulk Sampling, Handling, and Preparing Edible Vegetable Oils for Sensory Evaluation
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E1346–90(Reapproved 2000)
Standard Practice for
Bulk Sampling, Handling, and Preparing Edible Vegetable
Oils for Sensory Evaluation
This standard is issued under the fixed designation E1346; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4.3 Theobjectiveofthispracticeistoensurethatthesample
is representative of the sample source from the time of
1.1 This practice covers the recommended procedures for
sampling until the time of evaluation and to protect oil quality
bulk sampling, handling, and preparing edible vegetable oil
during that time.
(liquid at room temperature) prior to sensory evaluation.
4.4 This practice addresses neither evaluation and scaling
1.2 This practice is consistent with the background infor-
2 3 techniques, nor the sampling, handling, and preparing of solid
mation presented in ASTM STP 433, ASTM STP 434, and
fats.
ASTM STP758. These should be consulted for supplemental
guidance.
5. Apparatus
1.3 This standard does not purport to address all of the
5 6,7
5.1 Liquid Zone Sampler, or core sampler, or trier.
safety concerns, if any, associated with its use. It is the
5.2 Wide-Mouth Jars, made of polyethylene terephthalate,
responsibility of the user of this standard to establish appro-
0.5 to 1.0 L.
priate safety and health practices and determine the applica-
5.3 AmberGlassBottles,250mLto1L,withnarrow-mouth
bility of regulatory limitations prior to use.
tops that will withstand freezer temperatures.
2. Referenced Documents 5.4 Plastic Caps with Liners, or tape (PTFE pipe thread
tape), to cover top of bottle opening before capping with new
2.1 AOCS Standard:
non-metallic screw type caps. Tape should be 2.5 cm in width
Method C1-47 Sampling
or wider to completely cover bottle openings.
3. Summary of Practice 5.5 Glass Funnels.
5.6 Glove Box with inert gas nitrogen atmosphere, includ-
3.1 This practice consists of the following basic steps:
ing an oxygen scavenging device.
removing oil from bulk source, transporting and starting oil
5.7 GlassVial,50mL.Useamberglassforflavorevaluation
prior to evaluation, preparing oils for evaluation, presenting
and clear glass for visual examination of oil.
samples to panel, and cleaning glassware.
5.8 Standard Disposable Glass Pipets, 10 mL, one per each
4. Significance and Use
sample.
5.9 Circulating Waterbath, with automatic timer, thermostat
4.1 This practice is designed for use by the oil processor or
and rack.
research laboratory for evaluation by a trained sensory panel,
5.10 Waterbath Thermometer, with range from 20 to 100°C
or for use by quality control (QC) and quality assurance (QA)
in 1°C divisions, calibrated for 76 mm immersion, 305 mm
personnelforsamplingfromatanktruck,car,oranyotherbulk
long.
transportation container, or by both.
4.2 The consistent use of this practice will provide repre-
6. Precautions
sentative samples for all sensory, chemical and physical
6.1 Oil submitted for chemical and physical testing and for
analyses and will protect the oil from oxidation.
sensory evaluation should be from the same bulk sampling.
Tank trucks, cars, or any other bulk transportation containers
This practice is under the jurisdiction of ASTM Committee E-18 on Sensory
maybefilledwithasmanyassevenlayersandeachlevelofoil
Evaluation of Materials and Products,and is the direct responsibility of Subcom-
may be slightly different in quality. Oil samples should be
mittee E18.06 on Food, Beverage, and Tobacco Evaluation.
Current edition approved March 30, 1990. Published May 1990. handledinthesamemannerandtimeframetoensurehighdata
Basic Principles of Sensory Evaluation, ASTM STP 433, ASTM, 1968.
correlation.
Manual on Sensory Testing Methods, ASTM STP 434, ASTM, 1968.
Guidelines for the Selection and Training of Sensory Panel Members, ASTM
STP 758, ASTM.
5 6
Available from American Oil Chemists’ Society, P.O. Box 3989, Champaign, Available from Zone Devices, Inc., San Rafael, CA.
IL 61826. Available from Refinery Supply Co., Tulsa, OK.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E1346
6.2 Do not expose oil to any environmental condition (for polymer80to100mesh(3ftby ⁄8in.)andmolecularsieve5A
example, light, heat, oxygen, moisture) or any equipment 80to100mesh(9ftby ⁄16in.)with25°Coventemperatureand
(metals) that will cause oxidation of the oil and alter sensory
20 mL/min helium flow rate.
characteristics of the oil.
7.4 Store all oils at 5 or−20°C, except for the sample for
6.3 Use only new, clean, dry, and odor-free polyethylene
initial evaluation, which may be held at ambient temperature
terephthalatewide-mouthjarstocollectoilsamples;disposeof
(25°C) in the dark for 1 h after sampling from bulk storage
jars rather than cleaning them.
before analyses.
6.4 Flushbottleswithnitrogeninagloveboxpriortofilling
7.5 Samples should be held a maximum of 2 days at 5 6
the bottle.
2°C in the dark before evaluation. If evaluation is not possible
6.5 Obtain a representative oil sample for all evaluations
within this time frame, filled containers should be held
(sensory, chemical, instrumental); unblended multiple samples
at−20°C. Always store samples in the dark.
may produce different results.
7.6 Do not open bottles until ready for sample evaluation.
6.6 Do not allow glass containers in processing or produc-
During this holding period, bottles should remain sealed with
tion areas where oil sampling is done. Use new plastic
nitrogen in the headspace.
containers such as polyethylene terephthalate bottles for initial
sampling.Flushemptybottlewithnitrogenasdescribedin6.4. 7.7 Winterized Oil:
6.7 Transfer oil from plastic bottle to recommended glass
7.7.1 Frozen sample is removed from cold storage and held
bottles within one hour of collection and flush headspace with
at refrigerated (5 6 2°C) temperature until completely homo-
nitrogentominimizepotentialtransferofodorsorflavorsfrom
geneous, that is, clear, with no visible solids. The time
the plastic container to the oil (conduct procedure in glove box
requirements for thawing the oil will vary depending upon
under nitrogen atmosphere).
container size.
6.8 UsePFTE-linedcapsorPFTEtapeundercapstoprotect
7.7.2 Sample must be mixed just prior to evaluation by
oil from off-odors or flavors imparted from metallic or unlined
inverting bottle several times to ensure homogeneity and to
plastic caps.
minimizepotentialdensitydifferenceswithinthecontainer;for
6.9 Store oil in amber glass bottles to protect the oil from
example, a 500 mL bottle with between 0.5 and 1 cm
light oxidation.
headspace is inverted 10 times.
6.10 Choose size of storage bottle based on purpose of
7.8 Non-Winterized Oil:
evaluation, amount of oil required for each testing session or
7.8.1 The frozen sample is removed from cold storage and
for number of panelists, and amount of oil needed for instru-
held at refrigerated (5 6 2°C) temperature until it stabilizes at
mental or chemical tests. For example, a 1 Lsample of oil that
that temperature (5°C). Next, move container to ambient
requires evaluation quarterly should be stored in four 250-mL
temperature (25 6 5°C) until completely homogeneous; clear,
bottles.
no visible solids.
6.11 Discard any unused oil.
7.8.2 Sample must be mixed just prior to evaluation by
7. Procedures for Handling Samples Obtained from Bulk
inverting bottle several times to ensure homogeneity and to
Storage
minimizepotentialdensitydifferenceswithinthecontainer;for
7.1 Refer to the AOCS Official Method C1-47 on oil
example, a 500 mL bottle with
...

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