BS DD ISO TS 21872-2-2007 Microbiology of food and animal feeding stuffs Horizontal method for the detection of potentially enteropathogenic Vibrio spp Detection of species other t.pdf

1、DRAFT FOR DEVELOPMENTDD ISO/TS 21872-2:2007Microbiology of food and animal feeding stuffs Horizontal method for the detection of potentially enteropathogenic Vibrio spp. Part 2: Detection of species other than Vibrio parahaemolyticus and Vibrio choleraeICS 07.100.30g49g50g3g38g50g51g60g44g49g42g3g58

2、g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58DD ISO/TS 21872-2:2007This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 3

3、1 December 2007 BSI 2007ISBN 978 0 580 54958 8National forewordThis Draft for Development is the UK implementation of ISO/TS 21872-2:2007.This publication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publications and is of a provisional nature

4、. It should be applied on this provisional basis, so that information and experience of its practical application can be obtained.Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the international organization responsible for its conv

5、ersion to an international standard. A review of this publication will be initiated not later than 3 years after its publication by the international organization so that a decision can be taken on its status. Notification of the start of the review period will be made in an announcement in the appr

6、opriate issue of Update Standards.According to the replies received by the end of the review period, the responsible BSI Committee will decide whether to support the conversion into an international Standard, to extend the life of the Technical Specification or to withdraw it. Comments should be sen

7、t to the Secretary of the responsible BSI Technical Committee at British Standards House, 389 Chiswick High Road, London W4 4AL.The UK participation in its preparation was entrusted to Technical Committee AW/9, Microbiology.A list of organizations represented on this committee can be obtained on req

8、uest to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Amendments issued since publicationAmd. No. Date CommentsReference numberISO/TS 21872-2:2007(E)TECHNICAL SPECIFICATION ISO/TS21872-2First e

9、dition2007-04-15Microbiology of food and animal feeding stuffs Horizontal method for the detection of potentially enteropathogenic Vibrio spp. Part 2: Detection of species other than Vibrio parahaemolyticus and Vibrio cholerae Microbiologie des aliments Mthode horizontale pour la recherche des Vibri

10、o spp. potentiellement entropathognes Partie 2: Recherche des espces autres que Vibrio parahaemolyticus et Vibrio cholerae DD ISO/TS 21872-2:2007ii iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references 1 3 Terms and definitions .2 4 Principle2 4.1 General2 4.2 First enrichment

11、 in a liquid selective medium2 4.3 Second enrichment in a liquid selective medium 2 4.4 Isolation and identification .2 4.5 Confirmation.3 5 Culture media, reagents3 5.1 Enrichment medium: Alkaline saline peptone water (ASPW) .3 5.2 Solid selective isolation media.3 5.3 Saline nutrient agar (SNA) 3

12、5.4 Reagent for detection of oxidase.3 5.5 Saline triple sugar iron (TSI) agar 3 5.6 Saline medium for detection of ornithine decarboxylase (ODC) 3 5.7 Saline medium for detection of lysine decarboxylase (LDC)3 5.8 Saline medium for detection of arginine dihydrolase (ADH) 4 5.9 Reagent for detection

13、 of -galactosidase .4 5.10 Saline medium for detection of indole.4 5.11 Saline peptone waters.4 5.12 Sodium chloride solution4 6 Apparatus and glassware .4 7 Sampling.4 8 Preparation of test sample4 9 Procedure (see Annex A) 5 9.1 Test portion and initial suspension .5 9.2 First selective enrichment

14、 5 9.3 Second selective enrichment .5 9.4 Isolation and identification .5 9.5 Confirmation.6 10 Expression of results 10 11 Test report 10 Annex A (normative) Diagram of procedure.11 Annex B (normative) Composition and preparation of the culture media and reagents.12 Bibliography 24 DD ISO/TS 21872-

15、2:2007iv 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

16、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 al

17、l 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

18、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. In other circumstances, particularly when there is an urgent market requirement for such documents, a technical committee may decide to publish

19、 other types of normative document: an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in an ISO working group and is accepted for publication if it is approved by more than 50 % of the members of the parent committee casting a vote; an ISO Technical

20、Specification (ISO/TS) represents an agreement between the members of a technical committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting a vote. An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for

21、a further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an International Standard or be withdrawn. Attention is drawn to the possibility

22、 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/TS 21872-2 was prepared by Technical Committee ISO/TC 34, Food products, Subcommittee SC 9, Microbiology. ISO/TS 21872 consists of the

23、 following parts, under the general title Microbiology of food and animal feeding stuffs Horizontal method for the detection of potentially enteropathogenic Vibrio spp.: Part 1: Detection of Vibrio parahaemolyticus and Vibrio cholerae Part 2: Detection of species other than Vibrio parahaemolyticus a

24、nd Vibrio cholerae DD ISO/TS 21872-2:2007vIntroduction Because of the large variety of food and feed products, this horizontal method may not be appropriate in every detail for certain products. In this case, different methods, which are specific to these products may be used if absolutely necessary

25、 for justified technical reasons. Nevertheless, every attempt will be made to apply this horizontal method as far as possible. When this Technical Specification is next reviewed, account will be taken of all information then available regarding the extent to which this horizontal method has been fol

26、lowed and the reasons for deviations from this method in the case of particular products. The harmonization of test methods cannot be immediate, and for certain groups of products International Standards and/or national standards may already exist that do not comply with this horizontal method. It i

27、s hoped that when such standards are reviewed they will be changed to comply with this Technical Specification so that eventually the only remaining departures from this horizontal method will be those necessary for well-established technical reasons. DD ISO/TS 21872-2:2007blank1Microbiology of food

28、 and animal feeding stuffs Horizontal method for the detection of potentially enteropathogenic Vibrio spp. Part 2: Detection of species other than Vibrio parahaemolyticus and Vibrio cholerae WARNING In order to safeguard the health of laboratory personnel, it is essential that tests for detection of

29、 Vibrio spp., and the particularly toxigenic Vibrio cholerae, be conducted only in laboratories equipped for this purpose and under the supervision of an experienced microbiologist, and that great care be exercised in the disposal of contaminated material. 1 Scope This part of ISO/TS 21872 specifies

30、 a horizontal method for detection of the enteropathogenic Vibrio species, causing illness in or via the intestinal tract, other than Vibrio parahaemolyticus and Vibrio cholerae. The species detectable by the methods specified include Vibrio fluvialis, Vibrio mimicus and Vibrio vulnificus 1). It is

31、not suitable for the isolation of Vibrio hollisae. Strains of V. parahaemolyticus and V. cholerae may also be detected during the application of this method. This part of ISO/TS 21872 is applicable to products intended for human consumption and the feeding of animals, and environmental samples in th

32、e area of food production and food handling. This method is not appropriate for the detection of Vibrio metschnikovii as this is oxidase negative. NOTE 1 Vibrio metschnikovii has been occasionally isolated from human faecal samples and can be a cause of diarrhoeal diseases. NOTE 2 The identification

33、 of Vibrio species other than V. parahaemolyticus and V. cholerae is difficult, and needs further development. The biochemical tests given in this part of ISO/TS 21872 enable only a presumptive confirmation of these species. NOTE 3 Reasons for not applying this method are discussed in the Introducti

34、on. 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. 1) See 9.4.4. DD ISO/T

35、S 21872-2:20072 ISO 6887 (all parts), Microbiology of food and animal feeding stuffs Preparation of test samples, initial suspension and decimal dilutions for microbiological examination ISO 7218, Microbiology of food and animal feeding stuffs General requirements and guidance for microbiological ex

36、aminations ISO 8261, Milk and milk products General guidance for the preparation of test samples, initial suspensions and decimal dilutions for microbiological examination 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 potentially enteropath

37、ogenic Vibrio microorganisms which form typical colonies on solid selective media and which possess the described biochemical characteristics when the test is performed in accordance with this part of ISO/TS 21872 3.2 detection of potentially enteropathogenic Vibrio determination of the presence or

38、absence of presumptive, enteropathogenic Vibrio, in a specified quantity of product, when the test is performed in accordance with this part of ISO/TS 21872 4 Principle 4.1 General The detection of potentially enteropathogenic Vibrio spp. requires four successive phases (see also Annex A). NOTE Vibr

39、io can, indeed, be present in small numbers and are often accompanied by a much larger number of other microorganisms belonging to the Vibrionaceae family or to other families. Consequently, two successive selective enrichments are necessary. 4.2 First enrichment in a liquid selective medium The enr

40、ichment medium (alkaline saline peptone water, ASPW) (5.1) is inoculated with the test portion at ambient temperature. It is incubated at 37 C for 6 h 1 h. In the case of large quantities, the ASPW should be warmed to 37 C before inoculation with the test portion. 4.3 Second enrichment in a liquid s

41、elective medium The enrichment medium (ASPW) is then inoculated with the culture obtained in 4.2. It is incubated at 37 C for 18 h 1 h. 4.4 Isolation and identification The following two solid selective media are inoculated with the cultures obtained in 4.2 and in 4.3: thiosulfate citrate bile and s

42、ucrose agar (TCBS); another appropriate solid selective medium (left to the choice of the laboratory) such as colistin polymixin -cellobiose agar (CPC), sodium dodecyl sulfate polymixin B sucrose agar (SDS) or modified colistin polymixin cellobiose agar (mCPC) media. The two isolation media are incu

43、bated at 37 C, then examined after 24 h 3 h. DD ISO/TS 21872-2:200734.5 Confirmation The characteristic colonies of enteropathogenic Vibrio spp. isolated in 4.4 are subcultured, then confirmed by means of appropriate biochemical tests. 5 Culture media, reagents For general laboratory practice, see I

44、SO 7218. NOTE On account of the large number of culture media and reagents, for clarity of the text, their composition and preparation are given in Annex B. 5.1 Enrichment medium: Alkaline saline peptone water (ASPW) See B.1. 5.2 Solid selective isolation media 5.2.1 First medium: Thiosulfate, citra

45、te, bile and sucrose (TCBS) agar See B.2. 5.2.2 Second medium Choose between: a) sodium dodecyl sulfate polymixin sucrose agar (SDS), see B.3. b) cellobiose polymixin colistin agar (CPC), see B.4; c) modified cellobiose polymixin colistin agar (mCPC), see B.5. 5.3 Saline nutrient agar (SNA) See B.6.

46、 5.4 Reagent for detection of oxidase See B.7. 5.5 Saline triple sugar iron (TSI) agar See B.8. 5.6 Saline medium for detection of ornithine decarboxylase (ODC) See B.9. 5.7 Saline medium for detection of lysine decarboxylase (LDC) See B.10. DD ISO/TS 21872-2:20074 5.8 Saline medium for detection of

47、 arginine dihydrolase (ADH) See B.11. 5.9 Reagent for detection of -galactosidase See B.12. 5.10 Saline medium for detection of indole See B.13. 5.11 Saline peptone waters See B.14. 5.12 Sodium chloride solution See B.15. 6 Apparatus and glassware NOTE Disposable equipment is acceptable in the same

48、way as reusable glassware, if the specifications are similar. Usual microbiology laboratory equipment (see ISO 7218) and, in particular, the following. 6.1 Incubator, adjustable to 37 C 1 C. 6.2 Incubator or water bath, adjustable to 41,5 C 1 C. 6.3 Water bath, adjustable from 44 C to 47 C. 6.4 Wate

49、r bath, adjustable to 37 C 1 C. It is recommended to use water baths (6.2, 6.3 and 6.4) containing an antibacterial agent. 7 Sampling A 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 part of ISO/TS 21872. See the International Standard specific to the relevant product. If a specific International Standard does not exist, it is recommended that the relevant parties reach agreement on