EN ISO 1741:1994

Dextrose - Determination of loss in mass on drying - Vacuum oven method (ISO 1741:1980)

The method is applicable to the anhydrous product and to the monohydrat. It consists in drying of a test portion at 100 °C and a pressure not exceeding 135 mbar.

Dextrose - Bestimmung des Masseverlustes durch Trocknen - Vakuumschrank-Verfahren (ISO 1741:1980)

Diese Internationale Norm legt ein Vakuumschrank-Verfahren zur Bestimmung des Masseverlustes durch Trocknen con Dextrose fest. Das Verfahren ist bei Dextrose, wasserfrei und Dextrose-Monohydrat anwendbar.

Dextrose cristallisé - Détermination de la perte de masse à la dessiccation - Méthode par étuvage sous pression réduite (ISO 1741:1980)

La présente Norme internationale spécifie une méthode de détermination de la perte de masse à la dessiccation du dextrose cristallisé par étuvage sous pression réduite. La méthode est applicable au dextrose anhydre et au dextrose monohydraté.

Dekstroza - Določevanje izgube mase pri sušenju - Metoda sušenja v vakuumski sušilni peči (ISO 1741:1980)

General Information

• Status: Published
• Publication Date: 24-Aug-1994
• Withdrawal Date: 27-Feb-1995
• ICS: 67.180.20 - Starch and derived products
• Technical Committee: CEN/SS C10 - Starch
• Drafting Committee: CEN/SS C10 - Starch
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 13-Oct-1999
• Completion Date: 13-Oct-1999
• Ref Project: SIST EN ISO 1741:1998 - Dextrose - Determination of loss in mass on drying - Vacuum oven method (ISO 1741:1980)

Overview

EN ISO 1741:1994 (ISO 1741:1980) specifies a vacuum oven method for determining the loss in mass on drying (moisture-related mass loss) of dextrose, applicable to both anhydrous dextrose and dextrose monohydrate. The procedure dries a measured test portion at 100 °C and at a pressure not exceeding 135 mbar, then expresses the loss as a percentage of the product mass.

Key topics and requirements

• Scope: Applicable to anhydrous and monohydrate dextrose only.
• Test temperature and pressure: Drying at 100 °C ±1 °C and pressure ≤ 135 mbar (vacuum oven).
• Test portion sizes: About 10 g for anhydrous dextrose and about 5 g for d‑monohydrate.
• Sample and dish preparation:
  • Pre-dry the metal or glass dish and lid at 100 °C for 1 hour, cool in a desiccator and weigh to 0.0002 g.
  • Place test portion in the dish, fit lid and weigh before drying.
• Drying procedure:
  • Place covered dish in vacuum oven, remove lid inside oven and dry for 4 hours, maintaining reduced pressure.
  • Draw a slow stream of air through a drying train (silica gel column + gas scrubber with concentrated sulfuric acid) into the oven as pressure is restored after drying.
  • Replace lid, cool in desiccator and reweigh.
• Instrumentation: Electrically heated vacuum oven with calibrated thermometer and absolute pressure gauge; suitable vacuum pump to reach ≤135 mbar; analytical balance with required readability.
• Calculations: Loss on drying (%) = 100 × (m1 − m2) / (m1 − m0), where m0 = dish mass, m1 = dish + sample before drying, m2 = dish + sample after drying. Report the arithmetic mean of two determinations.
• Quality notes: If sample yellowing occurs, repeat at a lower temperature and document this in the report. Include all operating conditions and deviations in the test report.

Applications and users

• Routine quality control and specification testing in:
  • Sugar and glucose syrup manufacturers
  • Starch and derived-products industries
  • Food ingredient suppliers and food labs
• Regulatory and compliance testing for product labelling, shelf‑life and moisture specification.
• Analytical and contract testing laboratories performing moisture analysis, loss on drying, and dehydration assessments for dextrose.

Related standards

• ISO 1741-1980 is the original International Standard; EN ISO 1741:1994 represents CEN adoption. Laboratories should reference this standard when validating vacuum oven loss-on-drying methods for dextrose products.

Keywords: EN ISO 1741:1994, dextrose, loss in mass on drying, vacuum oven method, moisture analysis, anhydrous dextrose, dextrose monohydrate, 100 °C, 135 mbar, quality control.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-1998
'HNVWUR]D'RORþHYDQMHL]JXEHPDVHSULVXãHQMX0HWRGDVXãHQMDYYDNXXPVNL
VXãLOQLSHþL,62
Dextrose - Determination of loss in mass on drying - Vacuum oven method (ISO
1741:1980)
Dextrose - Bestimmung des Masseverlustes durch Trocknen - Vakuumschrank-
Verfahren (ISO 1741:1980)
Dextrose cristallisé - Détermination de la perte de masse a la dessiccation - Méthode par
étuvage sous pression réduite (ISO 1741:1980)
Ta slovenski standard je istoveten z: EN ISO 1741:1994
ICS:
67.180.20 Škrob in izdelki iz njega Starch and derived products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEIK~YHAPO~HAR OPI-AHM3AL&lR l-IO CTAH~APTkl3ALWl~ORGANISATION INTERNATIONALE DE NORMALISATION
Dextrose - Determination of loss in mass on drying -
Vacuum oven method
Mthode par bvage sous Pression rbduite
Dextrose cris Tallist - Dbtermina tion de Ia perte de masse A Ia dessicca tion -
First edition - 1980-08-01
UDC 664.162 : 543.81
Ref. No. ISO 1741-1980 (E)
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-
Descriptors : carbohydrates, glucose, tests, determination, mass losses, dehydration analysis, stoves (chemistry), low pressure tests.
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Price based on 2 pages
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards institutes (ISO member bedies). The work of developing Inter-
national Standards is carried out through ISO technical committees. Every member
body interested in a subject for which a technical committee has been set up 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 1741 was developed by Technical Committee ISO/TC 93,
Star& (including derivatives and by-productsl, and was circulated to the member
bodies in May 1979.
lt has been approved by the member bodies of the following countries :
Australia Kenya South Africa, Rep. of
Chile Libyan Arab Jamahiriya Spain
France Netherlands USA
Germany, F. R. Poland USSR
Israel Romania Y ugoslavia
The mem ber body following country expressed disapproval of the document on
of the
technical grounds
United Kingdom
Th is International Stan dard cancels and replaces ISO Recommendation R 1741-1970,
of which it constitutes a technical revisi on.
0 International Organkation for Standardkation, 1980
Printed in Switzerland
INTERNATIONAL STANDARD ISO 1741-1980 (E)
Dextrose - Determination of loss in mass on drying -
Vacuum oven method
1 Scope and field of application
4 Procedure
This International Standard specifies a vacuum oven method
4.1 Preparation of the test Sample
for the determination of the loss in mass on drying of dextrose.
Mix the Sample thoroughly and rapidly by stirring with a spatula
The method is applicable to anhydrous d
...