Canned food testing is the laboratory verification that a canned (heat-sterilised, hermetically sealed) food product meets the food-safety standard GB 7098 (National food safety Standard for Canned Foods), with the brand-new GB 7098-2025 edition (published 2025-03-16, implementing 2026-03-16) replacing GB 7098-2015. The test is built on a defining principle unique to canned foods: commercial sterility (商业无菌) — the condition where the product is free of microorganisms capable of growing in the food at normal non-refrigerated conditions, verified by GB 4789.26 (Examination of Commercial Sterility). This principle distinguishes canned-food testing from every other food category: a canned food is not tested for a specific pathogen count but for whether the entire sterilisation-and-seal system has rendered the product shelf-stable at ambient temperature. On top of the commercial-sterility core, the test covers tin migration from the can, histamine (in fish/seafood cans), and the contaminants/additives framework.
The Commercial-Sterility Principle
The single most important concept — and one absent from the search results — is that canned foods are not judged by the microbial-count logic that applies to fresh or pasteurised foods. A fresh dairy product is tested for total bacterial count and specific pathogens (CFU/g). A canned food is tested for commercial sterility: the condition achieved when the product has been heat-processed sufficiently that it contains no microorganisms capable of growing under normal non-refrigerated storage. The test asks "is this product microbiologically stable at room temperature for its entire shelf life?" — a fundamentally different question from "how many bacteria per gram?"
Commercial sterility ≠ absolute sterility. Commercial sterility does not mean zero microorganisms — it means no organisms capable of growing in the food at ambient storage. Heat-resistant spores that cannot germinate at the food's pH/water activity may survive and are acceptable; organisms that could grow and spoil the food or produce toxin must not be present. This is why the GB 4789.26 test includes incubation at 30–37 °C followed by examination for swelling, pH change, and microscopic/microbial evidence of growth — it tests for viable, capable-of-growing organisms, not for total cell counts.
The Two-Layer Structure
A canned-food compliance report is built from two layers:
| Layer | Standard | What it governs |
|---|---|---|
| Product standard | GB 7098-2025 (implementing 2026-03-16, replacing GB 7098-2015) | Sensory, physicochemical, microbial (commercial sterility), and processing requirements |
| Referenced standards | GB 2762 (contaminants), GB 2760 (additives), GB 2763 (pesticides), GB 4806 (food-contact materials) | The cross-cutting food-safety limits |
GB 7098-2025 is the headline standard; it sets the commercial-sterility requirement, references GB 4789.26 as the method, and delegates contaminants to GB 2762, additives to GB 2760, and food-contact-material migration to GB 4806.
GB 7098-2025 — the New Edition
GB 7098-2025 (食品安全国家标准 罐头食品) is the brand-new revision, published 2025-03-16, implementing 2026-03-16, replacing GB 7098-2015. It applies to canned foods generally (excluding infant canned complementary foods, which have their own standard). Key changes in the 2025 edition:
- Modified terminology and definitions — refined the definition of "canned food" and commercial sterility.
- Modified sensory requirements — updated the appearance, colour, odour, and texture criteria.
- Improved physicochemical indicators and contaminant limits — aligned the tin, heavy-metal, and other element limits with the current GB 2762 framework.
A current canned-food report cites GB 7098-2025; the 2015 edition is withdrawn at the 2026-03-16 implementation date.
Commercial-Sterility Test: GB 4789.26
GB 4789.26 (食品安全国家标准 食品微生物学检验 商业无菌检验) is the method standard for verifying commercial sterility. The current edition is GB 4789.26-2023 (replacing GB 4789.26-2013). The procedure:
- Sample preparation — the canned product is examined for visible defects (swelling, seam damage, leakage). Each can is opened aseptically using a sterile can opener on the disinfected smooth surface, without damaging the double seam (the seam's integrity is itself part of the test). Each can uses a separate opener (no cross-contamination).
- Incubation — the sealed cans (or opened samples) are incubated at 30–37 °C for 5–10 days (or per the product's specified incubation protocol). Any swelling (swell) during incubation is a fail signal.
- Post-incubation examination — after incubation, the product is examined for:
- Physical signs — swelling, gas production, abnormal appearance.
- pH change — a pH shift of >0.3 units from the pre-incubation value indicates microbial activity.
- Microscopic examination — direct smear for evidence of microbial growth.
- Subculture — inoculation of differential media to identify any growing organism.
- Seal-integrity test — the empty can's double-seam is tested for tightness (by减压 leak test or teardown measurement), because a seam defect is the root cause of post-process contamination.
- Reporting — the product is reported as commercially sterile (pass) or not commercially sterile (fail), with the reason (swelling, pH shift, specific organism identified, seam defect) stated.
Tin Migration — the Can-Material Hazard
A unique concern for canned foods (especially in tinplate cans) is tin (Sn) migration from the tin coating into the food. Tin is the defining canned-food contaminant because the can itself is its source. The limit is set by GB 2762 (contaminants) — tin is restricted in specific canned-food categories (particularly acidic canned foods like tomatoes and fruits, where the acidity accelerates tin dissolution). Excessive tin causes gastrointestinal irritation and, at very high levels, acute toxicity. The test method is GB 5009.11 or GB 5009.16.
Important clarification: modern cans increasingly use lacquered (enamelled) tinplate or tin-free steel (TFS) or aluminium, which largely eliminate tin migration. The tin limit applies primarily to unlacquered tinplate cans — but the test is still performed to verify that the lacquer coating is intact and functioning.
Histamine — the Fish/Seafood-Can Hazard
For canned fish and seafood products, histamine is a unique contaminant — it forms when the raw fish's histidine is decarboxylated by bacteria before canning (i.e., during raw-material handling, not during storage of the finished can). The heat sterilisation kills the bacteria but does not destroy the pre-formed histamine. The histamine limit is set by GB 2762, and the test (HPLC, GB 5009.208) verifies that the raw material was fresh enough to keep histamine below the limit.
Contaminants and Additives
Beyond the commercial-sterility core, canned foods must meet:
- GB 2762 — contaminants: lead, cadmium, arsenic, mercury, tin (category-specific), and histamine (fish cans).
- GB 2760 — additives: preservatives, colourings, acidulants (within permitted uses).
- GB 2763 — pesticide residues (carried from the raw agricultural material).
- GB 4806 — food-contact materials: migration from the can's internal lacquer, the tin coating, and the seal compound.
Our Testing Capabilities
Beijing ZKGX Research conducts canned-food testing across the GB 7098 + GB 4789.26 + referenced-standards framework:
- Product (GB 7098-2025, implementing 2026-03-16): sensory, physicochemical, and commercial-sterility requirements, with the 2015 → 2025 edition transition handled.
- Commercial sterility (GB 4789.26-2023): aseptic opening, incubation (30–37 °C, 5–10 d), post-incubation examination (swelling, pH shift, microscopy, subculture), and double-seam integrity testing.
- Contaminants (GB 2762): tin (GB 5009.16), lead, cadmium, arsenic, mercury, and histamine (fish/seafood cans, GB 5009.208).
- Additives (GB 2760): preservatives and other additives within permitted uses.
- Food-contact materials (GB 4806): migration from can lacquer, tin coating, and seal compound.
- Sample types: meat, poultry, fish/seafood, fruit, vegetable, and mixed canned foods in tinplate, TFS, aluminium, and retort-pouch packaging.
- Deliverable: a test report stating the product, the standard (GB 7098-2025 / GB 7098-2015 depending on date), the commercial-sterility result, the tin and contaminant values, and pass/fail against each applicable limit.
If you have a canned-food product requiring compliance verification, contact our testing team to scope the product category, the applicable GB 7098 edition, and the commercial-sterility testing plan.
Frequently Asked Questions
What standard governns canned food testing?
GB 7098 (National Food Safety Standard for Canned Foods) is the product standard, with GB 7098-2025 (implementing 2026-03-16) replacing GB 7098-2015. The commercial-sterility method is GB 4789.26-2023. Contaminants are per GB 2762, additives per GB 2760, and food-contact-material migration per GB 4806.
What is commercial sterility (商业无菌)?
Commercial sterility is the condition where a heat-processed canned food is free of microorganisms capable of growing in the food at normal non-refrigerated storage conditions. It does not mean zero microorganisms — heat-resistant spores that cannot germinate in the food may survive — but no organism capable of growing and spoiling the food or producing toxin may be present. It is verified by GB 4789.26 (incubation + post-incubation examination).
What replaced GB 7098-2015?
GB 7098-2015 was replaced by GB 7098-2025, published 2025-03-16, implementing 2026-03-16. The 2025 edition modified terminology and definitions, updated sensory requirements, and improved physicochemical indicators and contaminant-limit alignment with the current GB 2762 framework.
Why is tin (Sn) a special concern in canned foods?
Because the tin coating on tinplate cans can migrate into the food — especially acidic canned foods (tomatoes, fruits) where the acidity accelerates tin dissolution. Tin migration is limited by GB 2762 (category-specific). Modern lacquered tinplate, tin-free steel, and aluminium cans largely eliminate this concern, but the test verifies the lacquer is intact. The test method is GB 5009.16.
Is histamine tested in all canned foods?
No — histamine is specific to canned fish and seafood products. It forms when bacteria in the raw fish decarboxylate histidine before canning; the heat sterilisation kills the bacteria but does not destroy the pre-formed histamine. The histamine limit is in GB 2762, and the test (HPLC, GB 5009.208) verifies the raw material was fresh enough to keep histamine below the limit. Meat, vegetable, and fruit cans are not tested for histamine.