BS EN 1786-1997 Foodstuffs - Detection of irradiated food containing bone - Method by ESR spectroscopy《食品 经过辐射的含骨质食品检验 电子自旋共振光谱仪法》.pdf
《BS EN 1786-1997 Foodstuffs - Detection of irradiated food containing bone - Method by ESR spectroscopy《食品 经过辐射的含骨质食品检验 电子自旋共振光谱仪法》.pdf》由会员分享,可在线阅读,更多相关《BS EN 1786-1997 Foodstuffs - Detection of irradiated food containing bone - Method by ESR spectroscopy《食品 经过辐射的含骨质食品检验 电子自旋共振光谱仪法》.pdf(14页珍藏版)》请在麦多课文档分享上搜索。
1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1786 : 1997 The Eur
2、opean Standard EN 1786 : 1996 has the status of a British Standard ICS 67.040 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Foodstuffs Detection of irradiated food containing bone Method by ESR spectroscopyBS EN 1786 : 1997 This British Standard, having been prepared under t
3、he direction of the Consumer Products and Services Sector Board, was published under the authority of the Standards Board and comes into effect on 15 June 1997 BSI 1997 The following BSI references relate to the work on this standard: Committee reference AW/-/3 Draft for comment 95/500044 DC ISBN 0
4、580 27442 X Amendments issued since publication Amd. No. Date Text affected Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Panel AW/-/3, Food analysis Horizontal methods, upon which the following bodies were represented: Associati
5、on of Public Analysts Food and Drink Federation Institute of Food Science and Technology Laboratory of the Government Chemist Ministry of Agriculture Fisheries and Food Royal Society of ChemistryBS EN 1786 : 1997 BSI 1997 i Contents Page Committees responsible Inside front cover National foreword ii
6、 Foreword 2 Text of EN 1786 3ii BSI 1997 BS EN 1786 : 1997 National foreword This British Standard has been prepared under the direction of Technical Panel AW/-/3 and is the English language version of EN 1786 : 1996 Foodstuffs Detection of irradiated food containing bone Method by ESR spectroscopy,
7、 published by the European Committee for Standardization (CEN). EN 1786 was produced as a result of international discussions in which the United Kingdom took an active part. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document
8、comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 10, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brus
9、sels 1996 Copyright reserved to CEN members Ref. No. EN 1786 : 1996 E EUROPEAN STANDARD EN 1786 NORME EUROPE ENNE EUROPA ISCHE NORM December 1996 ICS 67.020 Descriptors: Foodtstuffs, irradiated foodstuffs, ionizing radiation, food analysis, detection of irradiation treatment, meat bones, fish bones,
10、 ESR-spectroscopy English version Foodstuffs Detection of irradiated food containing bone Method by ESR spectroscopy Produits alimentaires De tection daliments ionise s contenant des os ou des are tes Me thode par spectroscopie RPE Lebensmittel Nachweis von bestrahlten knochen- bzw. gra tenhaltigen
11、Lebensmitteln Verfahren mittels ESR-Spektroskopie This European Standard was approved by CEN on 1996-12-05. 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 alterat
12、ion. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translat
13、ion under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy Luxembourg, N
14、etherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 1786 : 1996 BSI 1997 Foreword This European Standard has been prepared by CEN/TC 275, Food analysis Horizontal methods, of which the Secretariat is held by DIN. This European Standard was elaborated on the basis of
15、 a protocol developed following a concerted action of the Commission of European Union (XII C.5). Experts and laboratories from EU and EFTA countries contributed jointly to the development of this protocol. This European Standard shall be given the status of a national standard, either by publicatio
16、n of an identical text or by endorsement, at the latest by June 1997, and conflicting national standards shall be withdrawn at the latest by June 1997. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Europ
17、ean Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Definition 3 3 Principle 3 4 Apparatus 3 5 Sampling plan 3 6 Procedur
18、e 3 7 Evaluation 4 8 Limitations 4 9 Validation 5 10 Test report 5 Annexes A (normative) Figures 6 B (informative) Further information on the applicability 7 C (informative) Bibliography 8Page 3 EN 1786 : 1996 BSI 1997 1) Suprasil is an example of a suitable product available commercially. This info
19、rmation is given for the convenience of users of this standard and does not constitute an endorsement by CEN of this product. 1 Scope This European Standard specifies a method for the detection of meat containing bone and fish containing bone, which have been treated with ionizing radiation, by anal
20、ysing the electron spin resonance (ESR) spectrum (also called the electron paramagnetic resonance (EPR) spectrum) of the bones, see 1 to 11. Inter-laboratory studies have been successfully carried out with beef bones, trout bones and chicken bones, see 12 to 18. Since the radiation-induced ESR signa
21、l is attributed to hydroxyapatite (see 7.1), which is the principal component of bones, it is expected that application of the method can be extended to all meat and fish species containing bones. These expectations are consistent with laboratory experience (see annex B). The detection limit depends
22、 on the state of mineralization of the bones, which is usually lower for small species (see clause 8). 2 Definition For the purposes of this standard, the following definition applies. ESR spectrum The signals obtained by the method described in this European Standard. They are either due to paramag
23、netic compounds formed by irradiation or to compounds originally present. 3 Principle ESR spectroscopy detects paramagnetic centres (e.g. radicals). An intense external magnetic field produces a difference between the energy levels of the electron spins m s =+and m s =2, leading to resonance absorpt
24、ion of an applied microwave beam in the spectrometer. ESR spectra are conventionally displayed as the first derivative of the absorption with respect to the applied magnetic field. The field and frequency values depend on the experimental arrangements (sample size and sample holder), while their rat
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