EN ISO 17932:2011
(Main)Palm oil - Determination of the deterioration of bleachability index (DOBI) and carotene content (ISO 17932:2011)
Palm oil - Determination of the deterioration of bleachability index (DOBI) and carotene content (ISO 17932:2011)
ISO 17932:2011 specifies a method for the determination of the deterioration of bleachability index (DOBI) of crude palm oil and the carotene content of crude or bleached palm oil and their fractions by spectrophotometric examination in the ultraviolet and visible range of the spectrum.
Palmöl - Bestimmung des Bleichindex zur Beurteilung der Qualität von rohem Palmöl (DOBI Deterioration of bleachability index) sowie des Carotingehaltes (ISO 17932:2011)
Diese Internationale Norm legt ein Verfahren zur Bestimmung des Bleichindex zur Beurteilung der Qualität
(DOBI) (en: deterioration of bleachability index) von rohem Palmöl und des Carotingehaltes von rohem und
gebleichtem Palmöl und dessen Anteilen durch spektrophotometrische Untersuchung im ultravioletten und
sichtbaren Bereich des Spektrums fest.
Huile de palme - Détermination de la détérioration de l'indice de blanchiment (DOBI) et de la teneur en carotène (ISO 17932:2011)
L'ISO 17932:2011 spécifie une méthode de détermination de la détérioration de l'indice de blanchiment (DOBI) de l'huile de palme brute et de la teneur en carotène de l'huile de palme brute ou blanchie et de leurs fractions, par spectrophotométrie dans le domaine ultraviolet et visible du spectre.
Palmovo olje - Ugotavljanje poslabšanja indeksa beline (DOBI) in deleža karotenov (ISO 17932:2011)
Ta mednarodni standard določa metodo za ugotavljanje poslabšanja indeksa beline (DOBI) surovega palmovega olja in deleža karotena surovega ali beljenega palmovega olja ter njunih masnih deležev s spektrofotometričnim pregledom v ultravijoličnem in vidnem razponu spektra.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2012
1DGRPHãþD
SIST EN ISO 17932:2007
Palmovo olje - Ugotavljanje poslabšanja indeksa beline (DOBI) in deleža karotenov
(ISO 17932:2011)
Palm oil - Determination of the deterioration of bleachability index (DOBI) and carotene
content (ISO 17932:2011)
Palmöl - Bestimmung des Bleichindex zur Beurteilung der Qualität von rohem Palmöl
(DOBI Deterioration of bleachability index) sowie des Carotingehaltes (ISO 17932:2011)
Huile de palme - Détermination de la détérioration de l'indice de blanchiment (DOBI) et
de la teneur en carotène (ISO 17932:2011)
Ta slovenski standard je istoveten z: EN ISO 17932:2011
ICS:
67.200.10 5DVWOLQVNHLQåLYDOVNH Animal and vegetable fats
PDãþREHLQROMD and oils
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 17932
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2011
ICS 67.200.10 Supersedes EN ISO 17932:2007
English Version
Palm oil - Determination of the deterioration of bleachability
index (DOBI) and carotene content (ISO 17932:2011)
Huile de palme - Détermination de la détérioration de Palmöl - Bestimmung des Bleichindex zur Beurteilung der
l'indice de blanchiment (DOBI) et de la teneur en carotène Qualität von rohem Palmöl (DOBI Deterioration of
(ISO 17932:2011) bleachability index) sowie des Carotingehaltes (ISO
17932:2011)
This European Standard was approved by CEN on 14 September 2011.
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, 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: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 17932:2011: E
worldwide for CEN national Members.
Contents Page
Foreword .3
Foreword
This document (EN ISO 17932:2011) has been prepared by Technical Committee ISO/TC 34 "Food products"
in collaboration with Technical Committee CEN/TC 307 “Oilseeds, vegetable and animal fats and oils and their
by-products - Methods of sampling and analysis” 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 March 2012, and conflicting national standards shall be withdrawn at
the latest by March 2012.
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.
This document supersedes EN ISO 17932:2007.
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, 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.
Endorsement notice
The text of ISO 17932:2011 has been approved by CEN as a EN ISO 17932:2011 without any modification.
INTERNATIONAL ISO
STANDARD 17932
Second edition
2011-09-15
Palm oil — Determination of the
deterioration of bleachability index
(DOBI) and carotene content
Huile de palme — Détermination de la détérioration de l’indice de
blanchiment (DOBI) et de la teneur en carotène
Reference number
ISO 17932:2011(E)
©
ISO 2011
ISO 17932:2011(E)
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 either ISO at the address below or ISO’s
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ii © ISO 2011 – All rights reserved
ISO 17932:2011(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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.
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 17932 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 11, Animal
and vegetable fats and oils.
This second edition cancels and replaces the first edition (ISO 17932:2005), which has been technically revised.
INTERNATIONAL STANDARD ISO 17932:2011(E)
Palm oil — Determination of the deterioration of bleachability
index (DOBI) and carotene content
1 Scope
This International Standard specifies a method for the determination of the deterioration of bleachability
index (DOBI) of crude palm oil and the carotene content of crude or bleached palm oil and their fractions by
spectrophotometric examination in the ultraviolet and visible range of the spectrum.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
ISO 661, Animal and vegetable fats and oils — Preparation of test sample
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
ISO Guide 34, General requirements for the competence of reference material producers
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
deterioration of bleachability index
DOBI
I
DoB
ratio of the absorbance of the test portion at 446 nm to that at 269 nm, as determined spectrophotometrically
in a 10 mm (1 cm) pathlength cell
NOTE DOBI is expressed to one decimal place without a dimension.
3.2
carotene content of vegetable oil
w
c
mass fraction of β-carotene in oil
NOTE The carotene content of vegetable oil is expressed in milligrams per kilogram.
4 Principle
A homogenized sample is dissolved in isooctane and the absorbance is measured spectrophotometrically at
446 nm and 269 nm. The DOBI value is the ratio of the absorbance at 446 nm to that at 269 nm. The test is a
measure of the ease of refining crude palm oil. A low DOBI value can indicate difficulty in refining the oil to a
low Lovibond colour. The absorbance at 446 nm is used for calculation of the carotene content.
5 Reagents
WARNING — Attention is drawn to the regulations which specify the handling of dangerous substances.
Technical, organizational and personal safety measures shall be followed.
ISO 17932:2011(E)
During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and distilled or
demineralized water or water of equivalent purity.
5.1 Solvent: isooctane (2,2,4-trimethylpentane), having an absorbance less than 0,12 at 230 nm and less
than 0,05 at 250 nm against water, measured in a cell with a pathlength of 10 mm (1 cm).
6 Apparatus
The glassware used for the determination shall be thoroughly cleaned and rinsed with the solvent (5.1) before
use, so that it is free from impurities having an absorbance within the wavelength range of 220 nm to 500 nm.
Usual laboratory apparatus and, in particular, the following.
6.1 Spectrometer, capable of operating in the ultraviolet and visible range and using 10 mm (1 cm) pathlength
quartz cells and preferably having a recording instrument.
Before use, it is recommended that the wavelength and absorbance scales of the spectrometer be checked
as follows.
a) Wavelength scale: This may be checked using a reference material consisting of an optical glass filter
containing holmium oxide which has distinct
...
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