Cereals and milled cereal products - Determination of the viscosity of flour - Method using an amylograph (ISO 7973:1992)

This International Standard specifies a method using an amylograph for determining the viscosity of a suspension of flour in water, in which the starch is gelatinized by heating, in order to assess the conditions of gelatinization of the flour and so judge whether there is any alpha-amylase activity.
This method is applicable to wheat and rye flour and also to wheat and rye grain
Notes :
1 This International standard has been prepared on the basis of the Brabender-type amylograph
2 This method applies strictly to an amylograph and not to a viscograph, since an amylograph possesses the following characteristics :
- it is possible to change the torque-measuring head;
- the heating coils are located around the bowl of the apparatus and at the bottom;
- there is no cooling rod for lowering the gel temperature.

Getreide und gemahlene Getreideerzeugnisse - Bestimmung der Viskosität von Mehl - Amylograph-Verfahren (ISO 7973:1992)

Céréales et produits de mouture des céréales - Détermination de la viscosité de la farine - Méthode utilisant un amylographe (ISO 7973:1992)

La CEI 61051-1:2007 est applicable aux varistances à caractéristique tension-courant symétrique utilisées dans les équipements électroniques. Cette deuxième édition annule et remplace la première édition publiée en 1991 et constitue une révision mineure qui porte sur des tableaux, des figures et des références.

Žito in mlevski žitni proizvodi - Določanje viskoznosti moke - Metoda z amilografom (ISO 7973:1992)

Ta mednarodni standard opredeljuje metodo z amilografom za določanje viskoznosti moke v vodi, v kateri je bil škrob s segrevanjem spremenjen v želatino za namen ocene pogojev, pod katerimi se moka spremeni v želatino, ter presojo, ali je prisotna aktivnost alfa-amilaze. Ta metoda velja za pšenično in rženo moko ter tudi za pšenična in ržena zrna  Opombe: 1 Ta mednarodni standard je bil pripravljen na podlagi amilografa vrste Brabender  2 Ta metoda velja izključno za amilograf in ne tudi za viskograf, saj ima amilograf naslednje značilnosti:  - mogoča je zamenjava glave za merjenje navora; - grelne tuljave so napeljane okrog posode in na dnu aparata; - za zniževanje temperature gela ni na voljo nobene hladilne palice.

General Information

Status
Published
Public Enquiry End Date
29-Sep-2015
Publication Date
01-Feb-2016
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-Jan-2016
Due Date
11-Mar-2016
Completion Date
02-Feb-2016

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SLOVENSKI STANDARD
SIST EN ISO 7973:2016
01-marec-2016
äLWRLQPOHYVNLåLWQLSURL]YRGL'RORþDQMHYLVNR]QRVWLPRNH0HWRGD]
DPLORJUDIRP ,62

Cereals and milled cereal products - Determination of the viscosity of flour - Method

using an amylograph (ISO 7973:1992)

Getreide und gemahlene Getreideerzeugnisse - Bestimmung der Viskosität von Mehl -

Amylograph-Verfahren (ISO 7973:1992)

Céréales et produits de mouture des céréales - Détermination de la viscosité de la farine

- Méthode utilisant un amylographe (ISO 7973:1992)
Ta slovenski standard je istoveten z: EN ISO 7973:2015
ICS:
67.060 äLWDVWURþQLFHLQSURL]YRGLL] Cereals, pulses and derived
QMLK products
SIST EN ISO 7973:2016 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 7973:2016
---------------------- Page: 2 ----------------------
SIST EN ISO 7973:2016
EN ISO 7973
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2015
EUROPÄISCHE NORM
ICS 67.060
English Version
Cereals and milled cereal products - Determination of the
viscosity of flour - Method using an amylograph (ISO
7973:1992)

Céréales et produits de mouture des céréales - Getreide und gemahlene Getreideerzeugnisse -

Détermination de la viscosité de la farine - Méthode Bestimmung der Viskosität von Mehl - Amylograph-

utilisant un amylographe (ISO 7973:1992) Verfahren (ISO 7973:1992)
This European Standard was approved by CEN on 30 November 2015.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7973:2015 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 7973:2016
EN ISO 7973:2015 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 7973:2016
EN ISO 7973:2015 (E)
European foreword

The text of ISO 7973:1992 has been prepared by Technical Committee ISO/TC 34 “Food products” of the

International Organization for Standardization (ISO) and has been taken over as EN ISO 7973:2015 by

Technical Committee CEN/TC 338 “Cereal and cereal products” the secretariat of which is held by

AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by June 2016, and conflicting national standards shall be

withdrawn at the latest by June 2016.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO 7973:1992 has been approved by CEN as EN ISO 7973:2015 without any modification.

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SIST EN ISO 7973:2016
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SIST EN ISO 7973:2016
INTERNATIONAL
STANDARD
7973
First edi tion
19924 2-o 1
Cereals and milled cereal products -
Determination of the viscosity of flour - Method
using an amylograph
Ckeales et produits de mouture des c&&ales - Dbtermination de la
viscosite de la farine - Methode utilisant un amylographe
Reference number
ISO 7973: 1992(E)
---------------------- Page: 7 ----------------------
SIST EN ISO 7973:2016
ISO 7973:1992(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. Esch 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, govern-
mental and non-governmental, in liaison with ISO, also take patt 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 Inter-
national Standard requires approval by at least 75 % of the member
bodies casting a vote.
International Standard ISO 7973 was prepared by Technical Committee
ISO/TC 34, Agricultural food products, Sub-Committee SC 4, Cereals and
pulses.
This International Standard takes into account Standard No. 126 of the
International Association for Cereal Science and Technology (ICC).
Annex A forms an integral part of this International Standard. Annexes
B and C are for information only.
0 ISO 1992

All rights reserved. No patt of this publication may be reproduced or utiiized in any form

or by any means, electronie or mechanical, including photocopying and microfilm, without

Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
---------------------- Page: 8 ----------------------
SIST EN ISO 7973:2016
ISO 7973:1992(E)
INTERNATIONAL STANDARD
Cereals and milled cereal products - Determination of the
viscosity of flour - Method using an amylograph
ISO 3093:1982, Cereals - Determination of falling
1 Scope
number.
This International Standard specifies a method using
an amylograph for determining the viscosity of a
Suspension of flour in watet-, in which the starch is 3 Definition
gelatinized by heating, in Order io assess the con-
ditions of gelatinization of the flour and so judge
For the purposes of this International Standard, the
whether there is any alpha-amylase activity.
following definition applies.
This method is applicable to wheat and rye flour and
3.1 amylograph viscosity: Maximum viscosity
also to wheat and rye grain.
reached by a Suspension of flour and water which is
gelatinized by heating under the conditions set out
NOTES
in this International Standard.
1 This International Standard has been prepared on the
lt is expressed as an arbitrary unit: amylograph unit
basis of the Brabender-type amylograph.
(AU) n
2 This method applies strictly to an amylograph and not
to a viscograph, since an amylograph possesses the fol-
lowing characteristics:
4 Principle
it is possible to Change the torque-measuring head;
Preparation of a Suspension of flour in watet-, fol-

- the heating coils are located around the bowl of the lowed by recording of the viscosity of the suspen-

apparatus and at the bottom;
sion which is heated at a constant rate from 30 ‘C
to the temperature corresponding to the moment at
- there is no cooling rod for lowering the gel tempera-
which viscosity Starts to decrease, having reached
ture.
its maximum (approximately 95 “C).
The increase in viscosity due to gelatinization of the
starch is dependent upon the increase in tempera-
2 Normative references
ture, the mechanical action of stirring and the ac-
tivity of alpha-amylase already present or added to
The following Standards contain provisions which,
the flour.
through reference in this text, constitute provisions
of this International Standard. At the time of publi-
cation, the editions indicated were valid. All stan-
5 Reagent
dards are subject to revision, and Parties to
agreements based on this International Standard
are encouraged to investigate the possibility of ap-
5.1 Distillled water, or water of equivalent purity.
plying the most recent editions of the Standards in-
dicated below. Members of IEC and ISO maintain
registers of currently valid Internaiional Standards.
6 Apparatus
ISO 712:1985, Cereals and cereal products - Deter-

mination of moisture content (Routine reference Usual laboratory equipment and, in particular, the

following.
method).
---------------------- Page: 9 ----------------------
SIST EN ISO 7973:2016
ISO 7973:1992(E)
6.1 Amylograph, having the following character-
7 Sampling
istics:
It is important that the laboratory receive a Sample
Speed of rotation of
which is truly representative and has not been
the spindle (75 + 1) rev/min
damaged or changed during transport and storage.
Torque exerted per
Sampling is not part of the method specified in this
amylograph unit
International Standard. Recommended sampling
(AU), using a stan-
methods are given in ISO 950 (for grains) and
dard measuring (6,86 & 0,14) x 10m5 N.m/AU
ISO 2170 (for milled products).
cartridge [(0,700 rt: 0,015) gf.cm/AU)]
Rate of temperature
rise (1,50 + 0,03) “C/min 8 Procedure
Linear Speed of the
recorder (0,50 + 0,Ol) cmlmin
8.1 Preparation of test Sample
Position the sensing pins and the pins of the bowl
8.1 .l Flour
so that they penetrate freely into the jig provided by
the manufacturer.
Use the laboratory Sample as provided, after thor-
ough mixing, taking test samples as required.
Adjust the pressure of the pen on the Paper as fol-
lows. Remove the pen, fill it with ink and weigh it.
At the end of the arm which normally holds the pen, 8.1.2 Grain
place a mass 0,5 g to. 1 g less than that of the com-
pletely filled pen. Adjust the Position of the counter-
Remove dust and coarse impurities from the lab-
weight to obtain equilibrium then remove the mass
oratory Sample and then take approximately 300 g
and replace the pen.
of grain.
Grind the Sample carefully in the mill (6.6), avoiding
heating or overloading.
6.2 Analytical baiante, accurate to within 0,l g.
Continue grinding for 30 s to 40 s alter the last of the
Sample has been fed into the mill. Bran particles up
6.3 Wrette, of 450 ml capacity, with an automatic
to 1 % remaining on the Screen may be discarded.
zeroing System.
Thoroughly mix the milled product.
6.4 Shallow beaker, of capacity 600 ml to 1000 ml,
8.2 Preliminary operations
or a conical flask with stopper.
8.2.1 Determination of the moisture content of the
6.5 Spatula, with a rubber or plastic end. test Sample
Determine the moisture content of the test Sample
(8.1) in accordance with ISO 712.
6.6 Milll), complying with the requirements of
ISO 3093 in the case of wheat and rye grains; i.e.
capable of grinding a product of moisture content
8.2.2 Adjustment of the amylograph and no-load
up to 30 % (m/m) and with adjustment to obtain a
test
meal meeting the requirements of table 1.
Manually adjust the starting temperature of the
temperature regulator to 30 OC, with the clutch in the
Table 1 - Particle size requirements
neutral Position. Fill the pen with ink. Place the
Meal passing through the
spindle in the bowl, connect the spindle to the shaft
Mesh opening of sieve
sieve
and lower the amylograph head into Position. Start
the motor and check that the pen moves over the
baseline of the recording Paper. If necessary, adjust
710 100
the Position of the pen on its arm. Stop the motor,
500 95 to 100
disconnect the spindle, lift and turn the head of the
210 to 200 80 or less
apparatus. Remove the spindle.
1) Kamas Slago 200 A and Falling Number type KT 120 mills
...

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