SIST EN ISO 11216:1999

Modified starch - Determination of content of carboxymethyl groups in carboxymethyl starch (ISO 11216:1998)

Migrated from Progress Sheet (TC Comment) (2000-07-10): According to a PC4 recommendation, CEN/BT agreed to launch a parallel voting ++ procedure on the draft international standard derived from the above ++ mentionned subject (Ref.nr. in ISO 11216).

Modifizierte Stärke - Bestimmung des Gehalts an Carboxymethylstärke (ISO 11216:1998)

Diese internationale Norm legt ein Verfahren zur Bestimmung des Gehalts an Carboxymethylgruppen in Carboxymethylsträrke fest. Das Verfahren ist geeignet zur Bestimmung eines Gehalts an Carboxymethylgruppen zwischen 1,6 % (m/m) und 10,0 % (m/m).

Amidons et fécules modifiés - Détermination de la teneur en groupes carboxyméthyles dans l'amidon carboxyméthylé (ISO 11216:1998)

La présente Norme internationale spécifie une méthode pour la détermination de la teneur en groupes carboxyméthyles dans l'amidon carboxyméthylé. La méthode convient à la détermination de teneurs en groupes carboxyméthyles comprises entre 1,6 % (m/m) et 10,0 % (m/m).

Modificiran škrob - Določevanje vsebnosti karboksimetilnih skupin v karboksimetil škrobu (ISO 11216:1998)

General Information

• Status: Published
• Publication Date: 30-Apr-1999
• ICS: 67.180.20 - Starch and derived products
• Technical Committee: KŽP - Agricultural food products
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-1999
• Due Date: 01-May-1999
• Completion Date: 01-May-1999
• Ref Project: EN ISO 11216:1998 - Modified starch - Determination of content of carboxymethyl groups in carboxymethyl starch (ISO 11216:1998)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 11216:1999
01-maj-1999
0RGLILFLUDQãNURE'RORþHYDQMHYVHEQRVWLNDUERNVLPHWLOQLKVNXSLQYNDUERNVLPHWLO
ãNUREX,62
Modified starch - Determination of content of carboxymethyl groups in carboxymethyl
starch (ISO 11216:1998)
Modifizierte Stärke - Bestimmung des Gehalts an Carboxymethylstärke (ISO
11216:1998)
Amidons et fécules modifiés - Détermination de la teneur en groupes carboxyméthyles
dans l'amidon carboxyméthylé (ISO 11216:1998)
Ta slovenski standard je istoveten z: EN ISO 11216:1998
ICS:
67.180.20 Škrob in izdelki iz njega Starch and derived products
SIST EN ISO 11216:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 11216:1999

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SIST EN ISO 11216:1999

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SIST EN ISO 11216:1999

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SIST EN ISO 11216:1999

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SIST EN ISO 11216:1999

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SIST EN ISO 11216:1999
INTERNATIONAL ISO
STANDARD 11216
First edition
1998-05-15
Modified starch — Determination of content
of carboxymethyl groups in carboxymethyl
starch
Amidons et fécules modifiés — Détermination des groupes
carboxyméthyles dans l'amidon carboxyméthylé
A
Reference number
ISO 11216:1998(E)

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SIST EN ISO 11216:1999
ISO 11216:1998(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national standards bodies (ISO member bodies). The work of
preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which
a technical committee has been established 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. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 11216 was prepared by Technical Committee
ISO/TC 93, Starch (including derivatives and by-products).
Annexes A and B of this International Standard are for information only.
©  ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii

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SIST EN ISO 11216:1999
©
INTERNATIONAL STANDARD  ISO ISO 11216:1998(E)
Modified starch — Determination of content of carboxymethyl
groups in carboxymethyl starch
1  Scope
This International Standard specifies a method for the determination of the content of carboxymethyl groups in
carboxymethyl starch. The method is suitable for determining carboxymethyl group contents between 1,6 % (m/m)
and 10,0 % ( / ).
m m
2  Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of the publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on the International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
ISO 1666:1996, Starch — Determination of moisture content — Oven-drying method.
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods.
3  Definition
For the purposes of this International Standard, the following definition applies.
3.1
carboxymethyl group content
mass of carboxymethyl groups in the acid form divided by the mass of the test portion of carboxymethyl starch in
the acid form
NOTE  The carboxymethyl group content is expressed as a percentage by mass.
4  Principle
The carboxymethyl groups are converted into the acid form by acidifying a solution or a suspension of the starch
with hydrochloric acid. After the starch is precipitated with methanol, it is allowed to settle before being filtered off on
a sintered glass crucible. The excess acid is completely removed by washing with methanol. The starch is dried and
a weighed portion is treated with a measured excess of sodium hydroxide solution. The sodium hydroxide not used
by the sample is back-titrated with hydrochloric acid.
1

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SIST EN ISO 11216:1999
©
ISO
ISO 11216:1998(E)
5  Reagents and materials
Use only reagents of recognized analytical grade.
5.1  Water, complying with at least grade 3 in accordance with ISO 3696. The water shall be free from carbon
dioxide.
5.2  Methanol, 100 %.
5.3  Hydrochloric acid, c(HCl) = 4 mol/l.
5.4  Sodium hydroxide solution, c(NaOH) = 0,1 mol/l, free from carbon dioxide.
5.5  Phenolphthalein solution, in ethanol 90 % (V/V), r(phenolphthalein) = 10 g/l.
5.6  Dilute hydrochloric acid, c(HCl) = 0,1 mol/l.
5.7  Sodium chloride.
6  Apparatus
Usual laboratory apparatus and, in particular, the following.
6.1  Beakers, of capacity 150 ml.
6.2  pH meter.
6.3 capable of high shear, and being explosion proof.
  Mechanical stirrer,
6.4  Beakers, of capacity 500 ml.
6.5  Crucibles, sintered glass, 40 ml volume, porosity P40 (pore size index 16 μm to 40 μm).
6.6  Drying oven, capable of being maintained at a temperature of 40 °C ± 2 °C, provided with air ventilation and
being explosion proof.
6.7  Pestle and mortar.
6.8  Sieve, 800 μm.
6.9  Blade mill.
6.10  Magnetic stirrer.
7  Sampling
It is important that the laboratory receive a sample which is truly representative and has not been damaged or
changed during transport or storage.
Sampling is not part of the method specified in this International Standard.
8  Preparation of test sample
Sieve the laboratory sample through the 800 μm sieve (6.8). If the material does not pass through the sieve, then
grind the sample with a blade mill (6.9) until it passes completely through the 800 μm sieve. Homogenize the
sample.
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SIST EN ISO 11216:1999
©
ISO
ISO 11216:1998(E)
9  Procedure
WARNING — Methanol is a key material in this analysis and is used in quite large quantities. Take all
necessary safety precautions because of the toxicity and flammability of methanol. Carry out all work in an
explosion-proof fume cupboard. All mechanical and electrical equipment used shall be explosion proof. In
addition, disposal of waste methanol shall be in accordance with legal requirements.
9.1  Test portion
Weigh, to the nearest 1 mg, about 3 g of the prepared test sample into a 150 ml beaker (6.1).
9.2  Conversion of the carboxymethyl salts
Wet the test portion with 3 ml of methanol (5.2) and stir with a spatula until homogeneous. Add 75 ml of water (5.1)
and stir until fully dispersed.
NOTE  For hi
...