ExFLP-26 Determination of Glass Particles and Other Extraneous Material by Candling
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A47342B85E8D4538A8CBC317B7642E05 |
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0.02 |
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页数： |
6 |
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日期： |
2012-3-3 |
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Government of Canada Gouvernement du Canada,Laboratory Procedure ExFLP-26,April 1996,HEALTH PROTECTION BRANCH,OTTAWA,DETERMINATION OF GLASS PARTICLES AND OTHER EXTRANEOUS MATERIAL BY CANDLING,B.E. Bowen,Evaluation Division, Bureau of Microbial Hazards, Food Directorate,Health Canada, Ottawa, Ontario K1A 0L2,1. APPLICATION,This method is applicable for the quick detection of glass and other extraneous material in liquid foods,contained in transparent containers.,2. DESCRIPTION,Candling is a process by which glass or other included foreign particles may be directly observed as,they settle through the product in the neck of the bottle 7.2.,Candling as utilized by food inspectors and the beverage industry has been applied successfully to,such products as alcoholic beverages, soft drinks, bottled water, seltzers, some types of juice and clear,fruit punches/drinks. The technique can also be applied to other related products (e.g. in jars, clear,plastic, etc.). Candling works best on clear liquids of low viscosity.,As applied to the beverage and related industries, candling is used as a fast, easy, non-destructive and,cost-efficient method for extraneous material analysis. It has the added advantage of being easy to,learn and apply. For these reasons, candling enables the inspector to examine large amounts of,product in a short period of time. The technique is often employed as a quality control measure at the,manufacturing level, or as a preliminary screening step for inspector/analysts to determine whether,more detailed methods of laboratory analysis are required.,Contributions to the development of this procedure were made by: N. Sachvie, C. Highfield, J. Moore,M.-A. Rivers and G.Graham.,3. COLLECTION OF SAMPLES,Obtain a minimum of 480 bottles selected at random from one lot.,As a general guide use the following sampling plan:,i) 12 bottles/case - 40 cases at random,ii) 24 bottles/case - 20 cases at random,iii) for other size of cases, vary the sample size accordingly so that as many full cases as,necessary are chosen to give the required total number of bottles.,iv) if numbers or lot sizes are insufficient, candle the entire lot.,Wherever possible, random tables or other such means should be used to select representative cases.,4. MATERIALS AND SPECIAL EQUIPMENT,1) inspection lamp - independent from ambient light source,- approximate power 15000-20000 lumens,- portable,ExFLP-26,- 2 - April 1996,- vented (for heat dissipation),- one such lamp currently in use is: MsK2-150 HPS-,120N, High Pressure Sodium GTE Fixture Sylvania,Lighting Products.,2) tripod,3) side panels - baffle arrangement (barn door type) attached to,lamp to prevent direct glare,4) industrial safety goggles- as approved by the Canada Labour Board as meeting,safety specifications for the intensity of light used,5) industrial safety gloves,6) warning signs - to advise that high intensity light is in use,5. PROCEDURE,The examination shall be carried out in accordance with the following instructions.,5.1 Isolation,5.1.1 Hold the bottle to be candled upright in front of the light source. (CAUTION: Wear approved,safety goggles to protect eyes from the intense light source.) Do not shake or invert the bottle,at this point or carbonation bubbles may result which may disperse small particles and make,positive identification more difficult.,5.1.2 Carefully examine the liquid contents starting with any surface debris.,5.1.3 Turn the bottle slowly, shining the light at an acute angle to the air-liquid interface in order to,reveal any visible particles on the surface of the liquid. Typical surface debris may include,crown dust, discs of mould, or small insects (Appendix 1, subsection 1.4).,5.1.4 Examine the fluid contents of the bottle while disturbing the contents as little as possible.,5.1.5 Shine the light through the contents at the bottom and gently swirl the bottle while still upright.,5.1.6 Watch the bottom for any foreign matter. (Swirling causes any sediment or particles on the,bottom to rise 2 to 5 centimetres into the product). Typical sediment debris may include glass,or metal fragments, mould, yeast, crown dust and fibrous material (Appendix 1).,5.1.7 Slowly invert the bottle to approximately 75o-90o. The construction of some bottles may,exclude any other method of examination. It has been found that a bottle angle of 45o is too,shallow to adequately view falling particles. In fact, many glass particles do not fall at all but,adhere to the sides of the bottle instead.,5.1.8 Examine for falling particles (for at least 20 seconds), concentrating on the shoulder and neck,areas of the bottle.,5.1.9 Rotate the bottle……
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