GB 4789.20-2024 National food safety standard
Food microbiological examination - Sampling and sample processing of fish and fishery products
1 Scope
This standard specifies the sampling and sample processing methods of fish and fishery products.
This standard is applicable to the sampling and sample processing of fish and fishery products.
2 Equipment and materials
2.1 Sampling tools
The sampling tools shall be made of stainless steel or other materials with appropriate strength, and they shall have smooth surfaces, and rounded corners, but not joints. The sampling tools, including stirring appliances, sampling scoops and spoons, knives, sampling drills, scissors, tweezers, etc., shall be cleaned and sterilized and kept dry before use.
2.2 Sample container
The material (such as glass, stainless steel, and plastic) and structure of the sample containers shall be able to fully make the samples the original state. The containers and their lids shall be clean, sterile, and dry. The sample containers, including sampling bags, a sampling tubes, sampling bottles, etc., shall have sufficient volume to allow the samples to be thoroughly mixed prior to inspection.
2.3 Other supplies
They may include alcohol lamp, thermometer, aluminum foil, sealing film, marker, and sampling registration form.
3 Sampling
3.1 Sampling principles and plans
The sampling principles and plans shall be implemented in accordance with the requirements of GB 4789.1.
The number (n) of the specimens to be sampled shall meet the requirements of relevant food safety standards. The sampling volume for each sample shall not be less than the volume of the sample for 5 × inspection units, or shall be determined according to the inspection purpose. The requirements for the sampling of food samples are specified as follows.
The sampling process of bulk fish and fishery products shall adopt aseptic operation, and the appropriate sampling method and quantity shall be determined according to the type of products and the inspection purpose. Except for a few large fish and marine mammals, only parts of them can be cut as samples. Generally, complete individuals shall be collected, and samples shall be taken in certain parts according to the requirements of Clause 4 when inspected.
3.2 Prepackaged fish and fishery products
3.2.1 For individually packaged solid or semi-solid fish and fishery products of less than or equal to 1,000g or liquid fish and fishery products of less than or equal to 1,000 mL, individually packaged products from the same batch shall be sampled.
3.2.2 For individually packaged solid or semi-solid fish and fishery products of more than 1,000g, the individual package may be collected, or a suitable amount of sample may be taken from different parts of the same packaging using the aseptic sampling tool and placed into a single aseptic sampling container. For liquid fish and fishery products of more than 1,000 mL, the individual package may be collected, or the liquid shall be shaken or stirred with a sterile rod before sampling to make it uniform, and then a suitable amount of sample may be collected into a single aseptic sampling container.
3.3 Bulk fish and fishery products
3.3.1 When the large fish and fishery products cannot be sampled, a suitable amount of sample may be taken from 5 different parts of the same packaging using the aseptic sampling tool and placed into a single aseptic sampling container as one food sample.
3.3.2 When judging the quality of a batch of fish and fishery products, multiple food samples shall be collected for inspection.
3.3.3 For uneven/multi-kinds of mixed fish and fishery products, all ingredients shall be sampled according to the proportion of each ingredient in the initial product.
3.3.4 For small fish and fishery products, mixed samples shall be collected.
3.4 Sample storage and transportation
The requirements of GB 4789.1 shall apply.
Contents
Foreword ii
Introduction iii
1 Scope
2 Normative References
3 Terms and Definitions
3 Dimensions
4 Marking
5 Technical Conditions
6 Mass of Riveted Nuts
Annex A (Informative) Mass of Flat Head Riveted Nuts
Bibliography
