EN ISO 5381:1994
(Main)Starch hydrolysis products - Determination of water content - Modified Karl Fischer method (ISO 5381:1983)
Starch hydrolysis products - Determination of water content - Modified Karl Fischer method (ISO 5381:1983)
Reaction of a solution of iodine, sulphur dioxide, pyridine and 2-methoxyethanol with the water contained in the product dispersed previously in a mixture of methanol and formamide. The method described in ISO 760 is improved by determing the content directly using the special solvent.
Stärkehydrolysenprodukte - Bestimmung des Wassergehalts - Modifiziertes Karl-Fischer-Verfahren (ISO 5381:1983)
Diese Internationale Norm legt ein Verfahren zur Bestimmung des Wassergehalts von Stärkehydrolysenprodukten fest.
Produits d'hydrolyse de l'amidon ou de la fécule - Dosage de l'eau - Méthode Karl Fischer modifiée (ISO 5381:1983)
La présente Norme internationale spécifie une méthode de dosage de l'eau dans les produits d'hydrolyse de l'amidon ou de la fécule.
Škrobni hidrolizati - Določevanje vode - Prirejena Karl Fisherjeva metoda (ISO 5381:1983)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 5381:1998
01-november-1998
âNUREQLKLGUROL]DWL'RORþHYDQMHYRGH3ULUHMHQD.DUO)LVKHUMHYDPHWRGD ,62
Starch hydrolysis products - Determination of water content - Modified Karl Fischer
method (ISO 5381:1983)
Stärkehydrolysenprodukte - Bestimmung des Wassergehalts - Modifiziertes Karl-Fischer-
Verfahren (ISO 5381:1983)
Produits d'hydrolyse de l'amidon ou de la fécule - Dosage de l'eau - Méthode Karl
Fischer modifiée (ISO 5381:1983)
Ta slovenski standard je istoveten z: EN ISO 5381:1994
ICS:
67.180.20 Škrob in izdelki iz njega Starch and derived products
SIST EN ISO 5381:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 5381:1998
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SIST EN ISO 5381:1998
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SIST EN ISO 5381:1998
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SIST EN ISO 5381:1998
International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONWE)YHAPO~HAR OP~AHH3ALWlR fl0 CTAHIIlA~l+l3ALWWORGANISATION INTERNATIONALE DE NORMALISATION
Starch hydrolysis products - Determination of water
Modified Karl Fischer method
content -
Produits d’hydrolyse de l’amidon ou de Ia fkule - Dosage de l’eau - AMhode Karl Fisher modifiee
First edition - 1983-08-01
UDC 664.2 : 543.812
w Ref. No. ISO 53814983 (EI
-
sp
Descriptors : carbo-hydrates, starches, food starch, tests, determination of content, water, Karl Fischer reagent, test equipment.
Price based on 6 pages
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SIST EN ISO 5381:1998
Foreword
ISQ (the international Organization for Standardization) is a woridwide federation of
national Standards bodies WO member bedies). The work of developing International
Standards is carried out through ISO technical committees. Every member body
interested in a subject for which a technical committee has been authorized has the
right to be represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council.
international Standard ISO 5381 was developed by Technical Committee ISCVTC 93,
Sta& (including derivatives and by-products), and was circulated to the member
bodies in April 1982.
lt has been approved by the member bodies of the following countries :
Canada
Germany, F. R. South Africa, Rep. of
Egypt, Arab Rep. of Netherlands
USA
France
Roland USSR
No member body expressed disapproval of the document.
International Organkation for Standardkation, 1983
Printed in Switzerland
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SIST EN ISO 5381:1998
ISO 5381-1983 (E)
INTERNATIONAL STANDARD
Starch hydrolysis products - Determination of water
Modified Karl Fischer method
content -
5.1 “Stabilized” Karl Fischer reagent.
0 lntroduction
The stabilized reagent is commercially available in the form of a
This International Standard is based on the method described
prepared Solution. It is also possible to prepare the reagent in
in ISO 760. However, it has been improved by determining the
the laboratory (sec ISO 760).
content directly using the methanoi/formamide solvent.
5.2 MethanoVformamide solvent.
1 Scope and field of application
Mix 700 mi of anhydrous methanol with 300 ml of anhydrous
formamide.
This International Standard specifies a method for the deter-
mination of the water content of starch hydrolysis products.
This reagent shail be handied with care.
5.3 Sodium tartrate, crystalline (Na2C4H406 . 2H,O).
2 Reference
This product is commercially available in the form “speciai
ISO 760, Determination of water - Karl Fischer method
quaiity for Karl Fischer”. If this quality cannot be obtained,
(General methodl.
wash the tartrate with 10 ml of the methanol/formamide sol-
vent (5.2), and carry out an appropriate blank test.
3 Principle
Crush the product so that it Passes completely through a sieve
of nominal aperture size 250 Pm, complying with the re-
Reaction of a Solution of iodine, sulphur dioxide, pyridine and
quirements of ISO 565. The water content of this hydrate is ap-
2methoxyethanol (stabilized Karl Fischer reagent) with the
proximately 1566 % (mlm) and shall be checked by vacuum
water contained in the product dispersed previously in a mix-
drying at 150 OC untii constant mass is obtained.
ture of methanol and formamide.
6 Apparatus
4 Reactions
Ordinary laboratory apparatus, in particuiar
HZ0 + l2 + SO2 + 3C,H,N -+ 2C,H,N.HI + C,H,N.S03
6.1 One-mark pipette, of capacity 20 mI.
C5H,N.S03 + ROH + C5H,NH.0S020R
6.2 Devices, into which the Sample to be ana
...
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