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1、INTERNATIONAL STANDARD ISO 7911 First edition 199 1-09-15 Unshelled pine nuts - Specification Pignons non decortiques - SpWications -.-_-w-p-.- Reference number ISO 7911:1991(E) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical St
2、andards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 7911:1991(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies). The work o
3、f preparing International Standards is normally carried out through ISO technical committees. Esch 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, govern- mental and non-governmen
4、tal, 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting
5、. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 7911 was prepared by Technical Committee ISO/TC 34, Agricultural food products, Sub-Committee SC 13, Dry arid dt-ied fruits and vegetables. Annexes A, B and
6、 C form an integral part of this International Standard. 0 ISO 1991 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronie or mechanical, including photocopying and microfilm, without permission In writing from the publisher. Internatio
7、nal Organizatlon for Standardization CaSe Postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo re
8、production or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISO 7911:1991(E) Unshelled pine nuts - Specification 1 Scope This International Standard specifies requirements for unshelled pine nuts, obtained from the cones of the stone pine tree (Pinus pinea Linnaeus), for
9、 hu- man consumption. lt applies to unshelled pine nuts obtained from cones which have been dried in the sun, or in spe- cial ovens. lt is not applicable to roasted, salted or any other type of processed pine nuts, or to pine nuts obtained by burning of the cones. 3 Definitions For the purposes of t
10、his International Standard, the following definitions apply. 3.1 pest-infested unshelled pine nuts: Nuts dam- aged externally or internally by insect infestation and/or infestation by other animal pests. 3.2 roden b) name and address of the Producer or packer; c) grade and size; d) batch or code num
11、ber; e) net mass (or gross mass), depending on the method of packing or at the request of the im- pot-ting country; f) producing country; g) any other marking required by the purchaser, such as the year of harvest and date of packing (if known); h) reference to this International Standard. Copyright
12、 International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 7911:1991 (E) Annex A (normative) Determination of e
13、xtraneous matter, extet-na1 defects and internal defects A.l Principle 111, rnx 100 0 Visual inspection of a test portion of unshelled pine nuts and physical Separation of the extraneous matter. Visual inspection of patt of the test Portion for external defects. Cracking of the nuts used for countin
14、g of external defects, and visual inspection for internal defects. l7?* is the mass, in grams, of the test Portion; 131, is the mass, in grams, of the matter. extraneous Give the result to one decimal place. A.2 Procedure A.3.2 Extemal defects A.2.1 Extraneous matter The proportion, expressed as a n
15、umber percentage, of nuts having external defects is equal to $x 100 Weigh, to the nearest 0,Ol g, a test Portion of about 300 g and spread it out on a clean white surface. Carefully separate the extraneous matter among or on the nuts by hand or by using tweezers. Weigh, to the nearest 0,Ol g, the s
16、eparated ex- traneous matter. where is the total num ber of nuts in the part of th e test Portion used for the test; A.2.2 External defects is the number of nuts having external defects. Weigh, to the nearest 0,01 g, about 100 g of the test Portion which is free from extraneous matter (A.2.1). Count
17、 the nuts and record the number. Sep- arate the nuts having external defects (see 3.5) and count them. Give the result to one decimal place. A.3.3 Internal defects A.2.3 Internal defects The Proportion, expressed as a number percentage, of nuts having internal defects is equal to n2 -gX 100 Use all
18、the nuts examined for extemal defects (A.2.2). Break them carefully one by one using a nutcraker or hammer. Separate the nuts having internal defects and count them. where Retain the Sound nuts for determination of the moistu re content (see an nex C). is the total num ber of nuts in the patt of the
19、 test Portion used for the test; A.3 Expression of results It2 is the number of nuts having internal de- fects. A.3.1 Extraneous matter Give the result to one decimal place. The extraneous m atter content centage by mas S, is eq ual to expressed as a per- 4 Copyright International Organization for S
20、tandardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISQ 7911:1991(E) Annex B (normative) Determination of sizes B.3.2 Method of sieving B.1 P
21、rinciple Hand sieving of a test portion of unshelled pine nuts to separate nuts of different size ranges, and deter- mination of the proportion of nuts in the different ranges. 8.2 Apparatus B.2.1 Test sieves, preferably two different Single test sieves having openings of nominal size 9,5 mm and.8 m
22、m, in accordance with ISO 565. The test sieving medium shall comply with ISO 3310-1 or ISO 3310-2, as appropriate. The test sieves shall be round with a nominal diam- eter of 300 mm, complying with the requirements given in ISO 3310-1 or ISO 3310-2, as appropriate. The requirements concerning markin
23、g, preparation, maintenance and accessories given in ISO 2591-1 are obligatory. B.3 Procedure B.3.1 Test Portion The test sieving shall be carried out in accordance with ISO 2591-1. B.3.3 End-point of sieving For unshelled pine nuts, the end-point of the sieving process may be taken to be the moment
24、 when the number of nuts passing through the sieve in il min is Zero. The nuts remaining on the sieve arc, then checked one by one in longwise position without applying forte. Those that pass through the aper- tures are included in the passing fraction (under- size). Those that do not pass b,ecome t
25、he residue (oversize). 6.3.4 Evakation of results . , B.3.4.1 Weighing and calculation Carry out the weighing and calculation in accord- ante with ISO 25914. B.3.4.2 Repeatability At least two determinations shall be carried out. In Order to obtain reliable results, it is necessary to sieve at least
26、 300 g of test Sample. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 7911:1991(E) C.1 Int
27、roduction Annex C (normative) Determination of moisture content The entrainment method specified in ISO 6756 may also be used. C.2 Principle Heating and drying of a test Portion of pine nut ker- nels at a temperature of 103 “C + 2 “C at atmos- pheric pressure. C.3 Apparatus Usual laboratory apparatu
28、s and, in particular, the following. C.3.1 Electric oven, having effective Ventilation and capable of being maintained at 103 “C + 2 OC. - C.3.2 Dish with lid, made of corrosion-resistant metal or of glass, with at least 18 cm* effective sur- face (for example, minimum diameter 50 mm) and 25 mm to 3
29、0 mm deep. C.3.3 Desiccator, containing an effective desiccant. C.3.4 Analytical balance. C.4 Sample Use as the Sample the Sound pine nut kernels found in the determination of internal defects (see A.2.3). C.5 Preparation of the test Sample Weigh, to the nearest 0,Ol g, approximately 10 g of Sound d
30、ecorticated kernels from the Sample (C.4) and break them by hand or tut them, using a razor blade or Iaboratory knife, into small pieces as quickly as possible, and in any case within 5 min, so that the greatest dimension of the particles does not exceed about 3 mm. C.6 Procedure C.6.1 fest Portion
31、Weigh the dried empty dish and lid (C.3.2). Imme- diately place in it a test Portion comprising approxi- mately half of the test Sample (C-5). Cover the dish with its lid and weigh to the nearest 0,001 g. C.6.2 Determination Place the dish (C.3.2) containing the test portion, with the lid alongside,
32、 in the oven (C.3.1) at 103 *C + 2 C. Keep it there for 6 h. DO not open the oven during this period. At the end of this period, remove the dish, cover it immediately with its lid and place it in the desiccator (C.3.3). After cooling to ambient temperature (approximately 30 min to 40 min), weigh it,
33、 still covered, to the nearest 0,001 g. C.6.3 Number of determinations Carry out two determinations on test portions treated individually from the Same test Sample. The cutting into pieces and weighing operations for each determination shall be carried out as rapidly as possible, and in any case wit
34、hin 5 min. C.7 Expression of results The moisture content, expressed as a percentage by mass, is equal to r71, 173 where P7?(J is the mass, in grams, of the empty dish and its lid; 171, is the mass, in grams, of the dish, its lid and the test Portion before oven drying; ii?2 is the mass, in grams, o
35、f the dish, its lid and the test Portion after oven drying. Take as the result the arit hmet ic mean of the two deter min ations, expressed to on e decimal place. 6 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/997
36、2545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 7911:1991(E) C.8 Test report as optional, together with details of any incidents which may have influenced the result. The test report shall specify the method used and the resul
37、t obtained. It shall also mention all operat- ing details not specified in this annex, or regarded The test report shall include all information necess- ary for the complete identification of the Sample. Copyright International Organization for Standardization Provided by IHS under license with ISO
38、Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- This page intentionaily IefI blank Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NAS
39、A Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- This page intentionally lefi blank Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical
40、Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 7911:1991(E) .- -.-.-.- - .-.-_ .-.- UDC 634.5:633.877.3 Descriptors: agricultwal products, nuts (food), pine nuts, specifications, packacjng, markig. Price based on 7 pages s-w - -.-VP- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 21:58:15 MDTNo reproduction or networking permitted without license from IHS -,-,-