GB/T 5009.37-2003 PDF English
US$105.00 · In stock · Download in 9 secondsGB/T 5009.37-2003: Method for analysis of hygienic standard of edible oils Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 5009.37: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 5009.37-2003 | English | 105 |
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Method for analysis of hygienic standard of edible oils
| Valid |
| GB/T 5009.37-1996 | English | 319 |
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Method for analysis of hygienic standard of edible oils
| Obsolete |
| GB 5009.37-1985 | English | 279 |
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Method for analysis of hygienic standard edible vegetable oils
| Obsolete |
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GB/T 5009.37-2003: Method for analysis of hygienic standard of edible oils---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT5009.37-2003
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 67.040
C 53
Replacing GB/T 5009.37-1996
Method for analysis of hygienic standard of edible oils
Issued on. AUGUST 11, 2003
Implemented on. JANUARY 01, 2004
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... 4
2 Normative references... 4
3 Sensory inspection... 4
4 Physical and chemical inspection... 5
Foreword
This standard replaces GB/T 5009.37-1996 “Method for analysis of hygienic
standard of edible oils”.
As compared with GB/T 5009.37-1996, the main changes of this standard are
as follows.
- ADD the peroxide value colorimetric method as the second method;
- MODIFY the structure of the original standard in accordance with GB/T
20001.4-2001 “Rules for drafting standards - Part 4.Methods of chemical
analysis”;
- MODIFY the determination method of carbonyl.
This standard was proposed by AND shall be under the jurisdiction of the
Ministry of Health of the People's Republic of China.
This standard was responsibly drafted by Shanghai Municipal Health and
Epidemic Prevention Station, Tianjin Municipal Health and Epidemic Prevention
Station, Anhui Provincial Health and Epidemic Prevention Station, Shaanxi
Provincial Health and Epidemic Prevention Station, Liaoning Provincial Health
and Epidemic Prevention Station, Hunan Provincial Health and Epidemic
Prevention Station, the Ministry of Health Food Hygiene Supervision and
Inspection Station.
This standard was first released in 1985, first revised in 1996.This is the second
revision.
Method for analysis of hygienic standard of edible oils
1 Scope
This standard specifies the analysis method for edible vegetable oil hygiene
indicators.
This standard applies to the analysis of edible vegetable oil hygiene indicators.
The detection limit of the residual solvent in this method is 0.10 mg/kg, the
detection limit of the second method of peroxide value is 0.003 meq/kg.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 5009.11 Determination of total arsenic and abio-arsenic in food
GB/T 5009.22 Determination of aflatoxin B1 in foods
3 Sensory inspection
3.1 Color
3.2 Smell and taste
POUR the specimen into a 150 mL beaker, PLACE it in a water bath, HEAT it
to 50 °C, USE a glass rod to stir it rapidly. SMELL its odor, TAKE a small amount
of specimen, TASTE it, DESCRIBE it using such wording as normal, scorching,
rancid, bitter and spicy.
4 Physical and chemical inspection
4.1 Acid value
4.1.1 Principle
Free fatty acid in vegetable oil is titrated by potassium hydroxide standard
solution, the milligrams of potassium hydroxide consumed per gram of
vegetable oil is known as the acid value.
4.1.2 Reagents
WEIGH 3.00 g ~ 5.00 g of uniformly mixed specimen, PLACE it in a conical
flask, ADD 50 mL of neutral ether - ethanol mixed solution, SHAKE to let the oil
dissolve, it may be placed into hot water if necessary to dissolve it. COOL it to
room temperature, ADD 2 ~ 3 drops of phenolphthalein indicator solution. USE
potassium hydroxide standard titration solution (0.050 mol/L) to titrate it, until
the color is becoming reddish AND there is color fading within 0.5 min, which is
considered as an end.
4.1.4 Result calculation
The acid value of the specimen is calculated in accordance with formula (1).
4.2 Peroxide value
4.2.1 Method I -- Titration method
4.2.1.1 Principle
Peroxide is produced in the oxidation of oil, peroxide reacts with the potassium
iodine to produce free iodine, which is titrated by sodium thiosulfate solution,
the content is calculated.
4.2.1.2 Reagents
4.2.1.3 Analytical procedures
WEIGH 2.00 g ~ 3.00 g of uniformly mixed specimen (filter it if necessary),
PLACE it into a 250 mL iodine bottle, ADD 30 mL of chloroform - glacial acetic
acid mixed solution, to make the specimen completely dissolved. ADD 1.00 mL
of saturated potassium iodide solution, tightly PLUG the bottle, gently SHAKE
it for 0.5 min, then PLACE it in the dark for 3 min. TAKE it out, ADD 100 mL of
water, SHAKE it uniformly, immediately USE the sodium thiosulfate standard
titration solution (0.0020 mol/L) to titrate it; when it becomes light yellow, ADD
1 mL of starch indicator solution, CONTINUE titration until the blue color
disappears as the end, TAKE the chloroform - glacial acetic acid solution,
potassium iodide solution, water of the same amount, USE the same method
to make the reagent blank test.
4.2.1.4 Calculation results
The peroxide value of the specimen is calculated in accordance with the formula
(2) and (3).
4.2.1.5 Precision
The absolute difference between two independent determinations obtained
under repeatability conditions shall not exceed 10% of the arithmetic mean.
4.2.2 Method II -- Colorimetric method
4.2.2.1 Principles
The specimen is dissolved by chloroform - methanol mixed reagent, the ferrous
ion in the specimen is oxidized into the ferric ion, which reacts with the
thiocyanate to produce yellow red iron thiocyanate complex. The absorbance
is measured at the wavelength 500 nm, which is compared with the standard
series for quantification.
4.2.2.2 Reagent
4.2.2.2.1 Hydrochloric acid solution (10 mol/L). accurately MEASURE 83.3 mL
of concentrated hydrochloric acid, ADD water to dilute it to 100 mL, MIX it
uniformly.
4.2.2.2.7 Iron standard use solution (0.01 g/L). PIPETTE 1.0 mL of iron
standard stock solution (1.0 mg/mL) into a 100 mL volumetric flask, ADD the
chloroform + methanol (7 + 3) mixed solvent to dilute it to the mark, MIX it
uniformly, each milliliter of this solution is equivalent to 10.0 µg of iron.
4.2.2.3 Instruments
4.2.2.3.1 Spectrophotometer.
4.2.2.3.2 10 mL glass colorimetric tube with plug.
4.2.2.4 Analytical procedures
4.4 Free gossypol (applicable to cottonseed oil)
4.4.1 UV spectrophotometry
4.4.1.1 Principles
The free gossypol in the specimen is extracted by acetone, the maximum
absorption occurs at 378 nm, the absorption value is proportional to the
gossypol content within a certain range, it is compared with the standard series
for quantification.
4.4.1.2 Instruments
UV spectrophotometer.
4.4.1.3 Reagents
4.4.1.3.1 Acetone (70%). ADD water to dilute 350 mL of acetone to 500 mL.
4.4.1.3.2 Gossypol standard solution. Accurately WEIGH 0.1000 g of gossypol,
PLACE it into a 100 mL volumetric flask, ADD acetone (70%) to dissolve it and
dilute it to the mark. Each milligram of this solution is equivalent to 1.0 mg of
gossypol.
4.10.2 Mineral oil
TAKE 1 mL of specimen, PLACE it in the conical flask, ADD 1 mL of potassium
hydroxide solution (600 g/L) and 25 mL of ethanol, CONNECT the air
condensing tube for backflow saponification for about 5 min, SHAKE it during
saponification to heat it uniformly. After saponification, ADD 25 mL of boiling
water, SHAKE it uniformly, if there is turbid or oil substance precipitation, it is
indicated that there is mineral oil which cannot be saponified.
4.10.3 Hemp oil
TAKE 10 µL of specimen and 10 µL of reference hemp oil, respectively, PLACE
the specimen onto the silica gel G thin plate, which is about 0.25 mm ~ 0.3 mm
in thickness, ACTIVATE it at 105 °C for 30 min. If the oil is too thick, USE 5
times benzene to dilute it, ADD specimen again, the addition amount is about
10 µL ~ 20 µL. The developing agent is benzene, the color developer is fast
blue salt B solution (1.5 g/L) (prepare it before use). When the spot, reference
color and RF value are equivalent, it is indicated that there is hemp oil. The flax
oil, sesame oil, and fast blue B salt are also in red, BUT they have smaller RF
value on the thin plate.
4.11 Aflatoxins
OPERATE in accordance with GB/T 5009.22.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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