1、May 2016 English price group 10No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 67.200.20!%SML“2484241www.din.deDIN
2、EN ISO 734Oilseed meals Determination of oil content Extraction method with hexane (or light petroleum) (ISO 734:2015);English version EN ISO 734:2015,English translation of DIN EN ISO 734:2016-05lsamenschrote Bestimmung des lgehaltes Extraktionsverfahren mit Hexan (oder Petrolether) (ISO 734:2015);
3、Englische Fassung EN ISO 734:2015,Englische bersetzung von DIN EN ISO 734:2016-05Tourteaux de graines olagineuses Dtermination de la teneur en huile Mthode par extraction lhexane (ou lther de ptrole) (ISO 734:2015);Version anglaise EN ISO 734:2015,Traduction anglaise de DIN EN ISO 734:2016-05Superse
4、desDIN EN ISO 734-1:2007-02www.beuth.deDocument comprises 14 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.04.16 DIN EN ISO 734:2016-05 2 A comma is used as the decimal marker. National foreword This document (EN ISO 734:2015
5、) has been prepared by Technical Committee ISO/TC 34 “Food products” (Secretariat: AFNOR, France) in collaboration with Technical Committee CEN/TC 307 “Oil seeds, vegetable and animal fats and oils and their by-products Methods of sampling and analysis” (Secretariat: AFNOR, France). The responsible
6、German bodies involved in its preparation were DIN-Normenausschuss Lebensmittel und landwirtschaftliche Produkte (DIN Standards Committee Food and Agricultural Products) and the Deutsche Gesellschaft fr Fettwissenschaft (German Fat Research Society), Joint Committee NA 057-05-05 AA Gemeinschaftsauss
7、chuss fr die Analytik von Fetten, len, Fettprodukten, verwandten Stoffen und Rohstoffen. The DIN Standards corresponding to the International Standards referred to in this document are as follows: ISO 659 DIN EN ISO 659 ISO 5725-1 DIN ISO 5725-1 ISO 5725-2 DIN ISO 5725-2 Amendments This standard dif
8、fers from DIN EN ISO 734-1:2007-02 as follows: a) the standard has been editorially revised and brought in line with the current rules of presentation. Previous editions DIN EN ISO 734-1: 2001-02, 2007-02 National Annex NA (informative) Bibliography DIN EN ISO 659, Oilseeds Determination of oil cont
9、ent (Reference method) DIN ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results Part 1: General principles and definitions DIN ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and
10、reproducibility of a standard measurement method EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 734 December 2015 ICS 67.200.20 Supersedes EN ISO 734-1:2006English Version Oilseed meals - Determination of oil content - Extraction method with hexane (or light petroleum) (ISO 734:2015)Tourte
11、aux de graines olagineuses - Dtermination de la teneur en huile - Mthode par extraction lhexane (ou lther de ptrole) (ISO 734:2015) lsamenschrote - Bestimmung des lgehaltes - Extraktionsverfahren mit Hexan (oder Petrolether) (ISO 734:2015) This European Standard was approved by CEN on 26 September 2
12、015. 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
13、 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-CE
14、NELEC 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, It
15、aly, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Av
16、enue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 734:2015 ENational foreword 3Introduction 51 Scope . 62 Normative references 63 Terms and definitions . 64 Principle 65 Reagents 66 Apparatus
17、. 67 Sampling 78 Preparation of test sample . 79 Procedure. 89.1 Number of determinations . 89.2 Test portion 89.3 Pre-drying . 89.4 Determination . 89.4.1 Preparation of the flask 89.4.2 First extraction 89.4.3 Second extraction 89.4.4 Elimination of solvent and weighing of the extract . 910 Expres
18、sion of results 911 Precision 1011.1 Interlaboratory test 1011.2 Repeatability 1011.3 Reproducibility 1012 Test report 10Annex A (informative) Results of an interlaboratory test . 11Bibliography . 12Contents PageDIN EN ISO 734:2016-05 EN ISO 734:2015 (E)2Foreword .4European foreword This document (E
19、N ISO 734:2015) 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 Sta
20、ndard 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
21、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 734-1:2006. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries
22、 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,
23、 Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 734:2015 has been approved by CEN as EN ISO 734:2015 without any modification. DIN EN ISO 734:2016-05 EN ISO 734:2015 (E)3 ForewordISO (the International Organization
24、 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
25、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.The pro
26、cedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editor
27、ial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).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. Details of any patent rights
28、 identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explana
29、tion on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this documen
30、t is ISO/TC 34, Food products, Subcommittee SC 2, Oleaginous seeds and fruits and oilseed meals.This second edition cancels and replaces ISO 734-1:2006, which has been renumbered and editorially revised.DIN EN ISO 734:2016-05 EN ISO 734:2015 (E)4 IntroductionA method for the determination of the oil
31、 content of oilseeds has been specified in ISO 659. It is therefore necessary to provide for control of oil production by establishing a reference method for the determination of the oil content of oilseed meals in the same way.DIN EN ISO 734:2016-05 EN ISO 734:2015 (E)5 1 ScopeThis International St
32、andard specifies a method for the determination of the hexane extract (or light-petroleum extract), called “oil content”, of meals (excluding compounded products) obtained by the extraction of oil from oilseeds by pressure or solvents.2 Normative referencesThe following documents, in whole or in par
33、t, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 771, Oilseed residues Determination of moistur
34、e and volatile matter contentISO 5502, Oilseed residues Preparation of test samples3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1oil contentall of the substances extracted under the operating conditions specified in this International Standard
35、, and expressed as a mass fraction, in percent, of the product as receivedNote 1 to entry: The oil content may also be expressed relative to dry matter.4 PrincipleA test portion of the product is extracted in a suitable apparatus, with technical hexane or, failing this, light petroleum. The solvent
36、is eliminated and the extract obtained is weighed.5 ReagentsUse only reagents of recognized analytical grade, unless otherwise specified.5.1 Technical hexane, n-hexane or light petroleum, essentially composed of hydrocarbons with six carbon atoms.Less than 5 % shall distil below 50 C and more than 9
37、5 % between 50 C and 70 C.For any of these solvents, the residue on complete evaporation shall not exceed 2 mg per 100 ml.6 ApparatusUsual laboratory apparatus and, in particular, the following.DIN EN ISO 734:2016-05 EN ISO 734:2015 (E)6 6.1 Mechanical grinder, easy to clean and allowing the meals t
38、o be ground, without heating and without appreciable change in moisture, volatile matter and oil content, to obtain particles which pass completely through a sieve of aperture size 1 mm.6.2 Mechanical microgrinder, of the Dangoumau type1)capable of producing a fineness of grinding of oilseed meals o
39、f less than 160 m, with the exception of the “shell” whose particles may reach 400 m.In laboratories where a microgrinder is not available, microgrinding of the ground sample (see 9.4.3) may be replaced by trituration with a pestle and mortar, in the presence of about 10 g of sand that has been wash
40、ed with hydrochloric acid and then calcined. However, grinding in a mortar cannot be applied in the case of multiple analyses because operator fatigue prevents sufficiently efficient grinding of numerous samples, and the extraction of oil from a coarsely ground sample can never be complete.6.3 Extra
41、ction thimble and cotton wool, or filter paper, free from matter soluble in hexane or light petroleum.6.4 Suitable extraction apparatus, fitted with a flask of capacity 200 ml to 250 ml.NOTE Straight-through extractors, for example the Butt, Smalley, Twisselmann and Bolton-Williams2)are suitable. Th
42、e use of other extractors is conditional upon the results of a test on a standard material of known oil content to confirm the suitability of the apparatus.6.5 Electric heating bath (e.g. sand bath, water bath) or hot plate.6.6 Electrically heated oven, with thermostatic control, permitting ventilat
43、ion or obtaining reduced pressure, capable of being maintained at 103 C 2 C.6.7 Desiccator, containing an efficient desiccant.6.8 Pumice stone, in small particles, previously dried in an oven at 103 C 2 C and cooled in a dessicator.6.9 Analytical balance, capable of weighing to an accuracy of 0,001
44、g.7 SamplingA representative sample should have been sent to the laboratory. It should not have been damaged or changed during transport or storage.Sampling is not part of the method specified in this International Standard. A recommended sampling method is given in ISO 5500.8 Preparation of test sa
45、mple8.1 Prepare the test sample in accordance with ISO 5502.1) The Dangoumau mechanical microgrinder is an example of suitable apparatus available commercially. This information is given for the convenience or users of this International Standard and does not constitute an endorsement by ISO of this
46、 apparatus.2) The Butt, Smalley, Twisselmann or Bolton-Williams straight-through extractors are examples of suitable apparatus available commercially. This information is given for the convenience of users of this International Standard and does not constitute an endorsement by ISO of this apparatus
47、.DIN EN ISO 734:2016-05 EN ISO 734:2015 (E)7 8.2 If necessary, grind the test sample in the previously well-cleaned mechanical mill (6.1). First, use about one-twentieth of the sample to complete the cleaning of the mill, and reject these grindings. Then grind the rest, collect the grindings, mix ca
48、refully and carry out the analysis without delay.9 Procedure9.1 Number of determinationsIf it is required to check whether the repeatability (11.2) is met, carry out two single determinations in accordance with 9.2 to 9.4.4.9.2 Test portion9.2.1 Weigh, to the nearest 0,001 g, about 10 g of the test sample (8.2).9.2.2 Transfer this test portio
