ExFLP-7 Rapid Determination of Glass in Particle-Free Food Products
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F0E1A3C6272D4DB2A561DBF1EC039454 |
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0.01 |
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页数： |
2 |
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日期： |
2012-3-3 |
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Published by: POLYSCIENCE PUBLICATIONS, P.O. Box 1606, Station St-Martin, Laval, Quebec,Canada H7V 3P9. TEL.: 1-800-840-5870. FAX: (450) 688-1930.,Government of Canada Gouvernement du Canada,Laboratory Procedure ExFLP-7,April 1995,HEALTH PROTECTION BRANCH,OTTAWA,RAPID DETERMINATION OF GLASS IN PARTICLE-FREE FOOD PRODUCTS,M.-A.Rivers1 and C. Highfield2,1Research Division, Bureau of Microbial Hazards,Food Directorate, Postal Locator: 2204A2,Health Canada, Ottawa ON, K1A 0L2,2Ontario Region, Health Canada, Scarborough ON, M1P 4R7,1. APPLICATION,The method is applicable to the sampling and rapid examination of particle-free food products packaged in glass that,cannot be candled due to product colour or viscosity, and/or container colour, opaqueness or shape. This revised method,replaces ExFLP-7, dated September 1994.,2. DEFINITION OF TERMS,A lot is defined as that amount (volume, weight, etc.) of the food which is produced, stored and/or shipped under,conditions as nearly uniform as possible, preferably designated by a common container code or marking and, in any,event, consisting of not more than one variety, grade or type of product from a single identifiable source.,3. COLLECTION OF SAMPLES,3.1 Obtain twenty-four (24) sample units selected at random from the lot. Each sample unit should consist of a,whole glass container. Twenty-four sample units constitute a sample.,3.2 Each sample unit must be kept separate and labelled 1,2,3 etc. Complete information respecting the lot size,size of individual containers, country of origin, exporter, importer or domestic manufacturer, and product and,lot identification should be recorded and accompany the sample.,4. MATERIALS AND SPECIAL EQUIPMENT,1) 1% hot sodium lauryl sulfate solution,2) Alcohol, 95%,3) U.S standard No. 40 sieve,4) Suction filtration apparatus with Buchner or Hirsch funnel (5-7 cm perforated plate),5) Ruled filter paper - larger than funnel plate (above),ExFLP-7,- 2 - April 1995,6) Petri dishes to suit size of filter papers used,7) Magnifying lens (3-5 x),8) Stereoscopic microscope (30-70 x),9) Polarizing or compound microscope equipped with polarizing filters,5. PROCEDURE,NOTE: All apparatus in contact with the analytical unit to be analyzed should be neither glass nor polyethylene.,Stainless steel apparatus is recommended.,The entire contents of the glass container constitutes an analytical unit.,Carry out the test in accordance with the following instructions:,5.1 Isolation,5.1.1 Empty the contents of the container onto the No. 40 sieve.,5.1.2 Rinse the container and cap 3 times with water and pour rinsings onto the sieve. If the product is oil based, first,rinse the container and cap 2 times with 1% hot sodium lauryl sulfate, and then 1 time with hot water. If the,detergent froths in the container, add a little 95 % alcohol. Transfer all rinsings to the No. 40 sieve.,5.1.3 Repeat 5.1.1 and 5.1.2 for the remaining 23 analytical units, compositing all material onto the No. 40 sieve.,5.1.4 Quantitatively transfer the sieve contents (containing material from 24 sample units) with the aid of water,alcohol, and/or 1 % sodium lauryl sulfate to ruled filter paper using suction filtration. The sieve should be rinsed,3 times and the rinsings transferred to the same filter paper.,5.1.5 Examine the jar and lid under magnifying lens (3-5 x) for chip damage and for the presence of glass particles.,5.2 Examination,5.2.1 Examine filter paper microscopically (30x) for glass fragments.,5.2.2 Particles of glass must be confirmed by examining through crossed polars on a polarizing or compound,microscope. Glass is isotropic to polarized light and should appear dark, whereas plastic will produce colours.,5.3 Recording Results,5.3.1 Record the number and size of glass fragments found through the isolation procedure for the 24 samples,composited.,5.3.2 Record the amount and size of chip damage on the container. Record the amount and size of glass particles,found in the lid.,6. INTERPRETATION,6.1 The Health Protection Branch considers glass particles 2 mm or greater in size as an injury hazard. Particles,of glass that are <2 mm in size, indicate a deviation from GMP.,6.2 If there is a question as to the acceptability of a lot, contact Evaluation Division, Bureau of Microbial Hazards,Food Directorate, Health Protection Branch (Phone: (613) 957-0349 or FAX: (613) 952-6400).……
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