EN ISO 27971:2008

Cereals and cereal products - Common wheat (Triticum aestivum L.) - Determination of alveograph properties of dough at constant hydration from commercial or test flours and test milling methodology (ISO 27971:2008)

ISO 27971:2008 specifies a method of using an alveograph to determine the rheological properties of different types of dough obtained from “soft” to “hard” wheat flour (Triticum aestivum L.) produced by industrial milling or laboratory test milling.
ISO 27971:2008 describes the alveograph test and how to use a laboratory mill to produce flour in two stages: 1) preparation of the wheat grain for milling to make it easier to separate the bran from the endosperm; and 2) the milling process itself, including the break system involving three fluted rollers, reduction of particle size between two smooth rollers and the use of a centrifugal sieving machine to grade the products.

Getreide und Getreideerzeugnisse - Weizen (Triticum aestivum L.) - Bestimmung der Eigenschaften von Teig bei konstanter Flüssigkeitszufuhr zu handelsüblichen Mehlen oder Versuchsmehlen bei gleichen Versuchsmahlverfahren mittels Alveograph (ISO 27971:2008)

Diese Internationale Norm legt ein Verfahren der Anwendung eines Alveographen zur Bestimmung der rheologischen Eigenschaften verschiedener Teigarten fest, die aus "Weich"- bis "Hart"-Weizenmehl (Triticum aestivum L.) erhalten wurden, das durch industrielles Vermahlen oder Vermahlen im Laborversuch hergestellt wurde.
Sie beschreibt das alveographische Prüfverfahren sowie die Art und Weise der Anwendung einer Labormühle zur Herstellung von Mehl in zwei Stufen:
Stufe 1: Vorbereitung des Weizens zum Vermahlen, damit die Kleie leichter vom Endosperm ge¬trennt werden kann (siehe Abschnitt 7);
Stufe 2: die Vermahlung selbst, die ein Schrotungssystem mit drei Riffelwalzen, die Verrin¬gerung der Korngröße zwischen zwei Glattwalzen und die Verwendung einer Zentrifugalsieb¬maschine zur Klassierung der Erzeugnisse umfasst (siehe Abschnitt 8).

Céréales et produits céréaliers - Blé tendre (Triticum aestivum L.) - Détermination des propriétés alvéographiques d'une pâte à hydratation constante de farine industrielle ou d'essai et méthodologie pour la mouture d'essai (ISO 27971:2008)

L'ISO 27971:2008 spécifie une méthode de détermination, au moyen d'un alvéographe, des caractéristiques rhéologiques de différents types de pâtes obtenues à partir de farines de blés tendres «soft» à «hard» (Triticum aestivum L.) issues de mouture industrielle ou de mouture d'essai en laboratoire.
Elle décrit l'essai à l'alvéographe et les conditions d'obtention de la farine au moyen d'un moulin de laboratoire en deux étapes: 1) préparation des grains de blé en vue de la mouture, afin de faciliter la séparation du son et de l'amande, et 2) processus de mouture comprenant un broyage entre trois cylindres cannelés, une réduction de la taille des particules entre deux cylindres lisses et le classement des produits à l'aide d'une bluterie centrifuge.

Žito in proizvodi iz žita - Skupna pšenica (Triticum aestivum L.) - Določevanje lastnosti testa iz običajnih komercialnih ali preskusnih mok z alveografom ob stalni hidraciji in s preskusnim postopkom mletja (ISO 27971:2008)

General Information

• Status: Withdrawn
• Publication Date: 14-May-2008
• Withdrawal Date: 09-Jun-2015
• ICS: 67.060 - Cereals, pulses and derived products
• Technical Committee: CEN/TC 338 - Cereal and cereal products
• Drafting Committee: CEN/TC 338 - Cereal and cereal products
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 10-Jun-2015
• Ref Project: SIST EN ISO 27971:2008 - Cereals and cereal products - Common wheat (Triticum aestivum L.) - Determination of alveograph properties of dough at constant hydration from commercial or test flours and test milling methodology (ISO 27971:2008)

Relations

• Replaced By: EN ISO 27971:2015 - Cereals and cereal products - Common wheat (Triticum aestivum L.) - Determination of alveograph properties of dough at constant hydration from commercial or test flours and test milling methodology (ISO 27971:2015)
• Effective Date: 24-Jun-2015

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2008
äLWRLQSURL]YRGLL]åLWD6NXSQDSãHQLFD7ULWLFXPDHVWLYXP/'RORþHYDQMH
ODVWQRVWLWHVWDL]RELþDMQLKNRPHUFLDOQLKDOLSUHVNXVQLKPRN]DOYHRJUDIRPRE
VWDOQLKLGUDFLMLLQVSUHVNXVQLPSRVWRSNRPPOHWMD,62
Cereals and cereal products - Common wheat (Triticum aestivum L.) - Determination of
alveograph properties of dough at constant hydration from commercial or test flours and
test milling methodology (ISO 27971:2008)
Getreide und Getreideerzeugnisse - Weizen (Triticum aestivum L.) - Bestimmung der
Eigenschaften von Teig bei konstanter Flüssigkeitszufuhr zu handelsüblichen Mehlen
oder Versuchsmehlen bei gleichen Versuchsmahlverfahren mittels Alveograph (ISO
27971:2008)
Céréales et produits céréaliers - Blé tendre (Triticum aestivum L.) - Détermination des
propriétés alvéographiques d'une pâte à hydratation constante de farine industrielle ou
d'essai et méthodologie pour la mouture d'essai (ISO 27971:2008)
Ta slovenski standard je istoveten z: EN ISO 27971:2008
ICS:
67.060 äLWDVWURþQLFHLQSURL]YRGLL] Cereals, pulses and derived
QMLK products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 27971
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2008
ICS 67.060
English Version
Cereals and cereal products - Common wheat (Triticum
aestivum L.) - Determination of alveograph properties of dough
at constant hydration from commercial or test flours and test
milling methodology (ISO 27971:2008)
Céréales et produits céréaliers - Blé tendre (Triticum Getreide und Getreideerzeugnisse - Weizen (Triticum
aestivum L.) - Détermination des propriétés aestivum L.) - Bestimmung der Eigenschaften von Teig bei
alvéographiques d'une pâte à hydratation constante de konstanter Flüssigkeitszufuhr zu handelsüblichen Mehlen
farine industrielle ou d'essai et méthodologie pour la oder Versuchsmehlen bei gleichen Versuchsmahlverfahren
mouture d'essai (ISO 27971:2008) mittels Alveograph (ISO 27971:2008)
This European Standard was approved by CEN on 4 February 2008.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 27971:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3
Foreword
This document (EN ISO 27971:2008) has been prepared by Technical Committee CEN/TC 338 "Cereal and
cereal products", the secretariat of which is held by AFNOR, in collaboration with Technical Committee
ISO/TC 34 "Agricultural food products".
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 November 2008, and conflicting national standards shall be withdrawn
at the latest by November 2008.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

INTERNATIONAL ISO
STANDARD 27971
First edition
2008-05-15
Cereals and cereal products — Common
wheat (Triticum aestivum L.) —
Determination of alveograph properties
of dough at constant hydration from
commercial or test flours and test milling
methodology
Céréales et produits céréaliers — Blé tendre (Triticum aestivum L.) —
Détermination des propriétés alvéographiques d'une pâte à hydratation
constante de farine industrielle ou d'essai et méthodologie pour la
mouture d'essai
Reference number
ISO 27971:2008(E)
©
ISO 2008
ISO 27971:2008(E)
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ISO 27971:2008(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Principle. 1
4 Reagents. 2
5 Apparatus . 2
6 Sampling. 3
7 Preparation of the wheat for test milling. 3
7.1 Cleaning the laboratory sample . 3
7.2 Test portion . 7
7.3 Wheat moisture content determination. 7
7.4 Wheat conditioning. 7
8 Laboratory milling. 10
8.1 General. 10
8.2 Milling procedure. 10
8.3 Expression of milling results. 11
9 Preparation and alveograph test. 12
9.1 Preliminary checks . 12
9.2 Preliminary operations. 12
9.3 Kneading. 14
9.4 Preparation of dough test pieces. 16
9.5 Alveograph test. 18
9.6 Expression of the results of the alveograph test . 20
10 Precision. 22
10.1 Interlaboratory tests . 22
10.2 Repeatability limits . 22
10.3 Reproducibility limits . 23
10.4 Uncertainty . 24
11 Test report . 25
Annex A (informative) Characteristics of the Chopin-Dubois CD1 mill. 26
Annex B (normative) Quantity of water to be added to wheat for conditioning. 28
Annex C (informative) Sample milling sheet . 30
Annex D (informative) Conversion table for L to G . 32
Annex E (informative) Interlaboratory data for commercial flour. 34
Annex F (informative) Interlaboratory data for laboratory milled flour. 37
Annex G (informative) Routine maintenance instructions for the alveograph . 48
Annex H (informative) Assessment of proteolytic activity assessment in wheat or flour
(T. aestivum L.). 50
Bibliography . 52

ISO 27971:2008(E)
Foreword
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(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
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Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 27
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