EN ISO 3656-2011 en Animal and vegetable fats and oils - Determination of ultraviolet absorbance expressed as specific UV extinction (Incorporates Amendment A1 2017)《动物和植物脂肪和油 特异性紫.pdf
《EN ISO 3656-2011 en Animal and vegetable fats and oils - Determination of ultraviolet absorbance expressed as specific UV extinction (Incorporates Amendment A1 2017)《动物和植物脂肪和油 特异性紫.pdf》由会员分享,可在线阅读,更多相关《EN ISO 3656-2011 en Animal and vegetable fats and oils - Determination of ultraviolet absorbance expressed as specific UV extinction (Incorporates Amendment A1 2017)《动物和植物脂肪和油 特异性紫.pdf(18页珍藏版)》请在麦多课文档分享上搜索。
1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 3656:2011Animal and vegetable fatsand oils Determinationof ultraviolet absorbanceexpressed as specific UVextinction (ISO 3656:2011)BS EN ISO 3656:2011 BRITISH STANDARDN
2、ational forewordThis British Standard is the UK implementation of EN ISO 3656:2011.It supersedes BS EN ISO 3656:2002 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee AW/307, Oil seeds, animal and vegetable fats and oilsand their by products.A list of org
3、anizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011 ISBN 978 0 580 66514 1 ICS 67.200.10 Compliance with a British Standa
4、rd cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 28 February 2011. Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3656 Febr
5、uary 2011 ICS 67.200.10 Supersedes EN ISO 3656:2002English Version Animal and vegetable fats and oils - Determination of ultraviolet absorbance expressed as specific UV extinction (ISO 3656:2011) Corps gras dorigines animale et vgtale - Dtermination de labsorbance dans lultraviolet, exprime sous la
6、forme dextinction spcifique en lumire ultraviolette (ISO 3656:2011) Tierische und pflanzliche Fette und le - Bestimmung der Ultraviolett-Absorption, ausgedrckt als spezifische UV-Extinktion (ISO 3656:2011) This European Standard was approved by CEN on 22 January 2011. CEN members are bound to comply
7、 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 M
8、anagement 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
9、 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, Por
10、tugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any mean
11、s reserved worldwide for CEN national Members. Ref. No. EN ISO 3656:2011: EBS EN ISO 3656:2011 EN ISO 3656:2011 (E) 3 Foreword This document (EN ISO 3656:2011) has been prepared by Technical Committee ISO/TC 34 “Food products“ in collaboration with Technical Committee CEN/TC 307 “Oilseeds, vegetable
12、 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 August 2011, and conf
13、licting national standards shall be withdrawn at the latest by August 2011. 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 docum
14、ent supersedes EN ISO 3656:2002. 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,
15、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 3656:2011 has been approved by CEN as a EN ISO 3656:2011 without a
16、ny modification. BS EN ISO 3656:2011ISO 3656:2011(E) ISO 2011 All rights reserved iiiForeword 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 thr
17、ough 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 collabo
18、rates 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 Stand
19、ards. 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
20、this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 3656 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 11, Animal and vegetable fats and oils. This fourth edition cancels and replaces
21、the third edition (ISO 3656:2002), which has been technically revised. BS EN ISO 3656:2011ISO 3656:2011(E) iv ISO 2011 All rights reservedIntroduction This International Standard describes a method for the determination of the absorbance of light in the ultraviolet (UV) spectrum by fats and oils. Ch
22、anges in absorption in the UV region are used as quality, purity, and authenticity criteria for fats and oils. Refining causes the formation of conjugated dienes and trienes and increased values of K232and K268, which then indicate the presence of refined oils. The oxidation of linoleic and linoleni
23、c acids results in the formation of hydroperoxides in which the double bonds become conjugated. Furthermore, the formation of either carbon-carbon bonds or carbon-oxygen bonds (,-unsaturated carbonyl compounds) as secondary autoxidation products are observed. These compounds all lead to an increase
24、of the absorption in the region between 225 nm and 325 nm. The third edition of this International Standard allowed the determination of the UV absorbance at 232 nm and 268 nm using three different solvents (isooctane, cyclohexane or n-hexane). However, it is known that the solvents themselves have
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
本资源只提供5页预览,全部文档请下载后查看!喜欢就下载吧,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ENISO36562011ENANIMALANDVEGETABLEFATSANDOILSDETERMINATIONOFULTRAVIOLETABSORBANCEEXPRESSEDASSPECIFICUVEXTINCTIONINCORPORATESAMENDMENTA12017

链接地址:http://www.mydoc123.com/p-722382.html