Simultaneous determination of multiple mycotoxins enables food, feed, and grain operators to quantify aflatoxins, deoxynivalenol, zearalenone, ochratoxin A, fumonisins, and T-2/HT-2 toxins in a single extraction and instrumental run. Accredited third-party laboratories apply validated UHPLC-MS/MS methods aligned with GB, ISO, EN, and AOAC standards to detect co-occurring contaminants at or below regulatory limits. This guide explains the scope, sample matrices, target analytes, analytical workflow, quality control, and practical applications of multi-mycotoxin testing.
Technical Overview
Mycotoxins are toxic secondary metabolites produced by filamentous fungi, primarily from the genera Aspergillus, Penicillium, Fusarium, Alternaria, and Claviceps. These contaminants develop in crops before harvest, during drying and storage, and can persist through processing into finished foods and animal feeds. Because a single substrate frequently supports several fungal species, and a single fungal species may biosynthesize multiple toxins, co-contamination of a commodity with two or more mycotoxins is common, and combined exposure can produce additive or synergistic adverse effects even when each individual toxin is below its regulatory limit.
Simultaneous multi-mycotoxin determination addresses this challenge by quantifying a broad panel of regulated and emerging toxins in one analytical sequence, typically using ultra-high performance liquid chromatography coupled with tandem mass spectrometry (UHPLC-MS/MS). This approach replaces the traditional series of single-analyte immunoaffinity column and HPLC methods, dramatically improving throughput, reducing sample consumption, and providing a complete contamination profile for compliance with regulations such as GB 2761 in China, Regulation (EU) 2023/915, and the Codex Alimentarius General Standard for Contaminants and Toxins in Food and Feed (CXS 193-1995).
Accredited third-party laboratories offering this service operate under ISO/IEC 17025 quality systems, apply stable isotope dilution quantification, and validate performance characteristics, including limit of quantification, recovery, and precision, in accordance with GB 5009 series methods, ISO and EN standards, AOAC Official Methods, and European Union performance criteria for mycotoxin analysis.
Testing Samples
Cereals and Cereal Products
Maize, wheat, barley, oats, rice, sorghum, and derived products such as flour, bran, breakfast cereals, noodles, and malt are the highest-volume matrices. These commodities are prone to Fusarium toxins, including deoxynivalenol, zearalenone, and fumonisins, as well as storage-related aflatoxins and ochratoxin A.
Nuts, Seeds, and Dried Fruits
Feeds and Feed Ingredients
Complete feeds, premixes, corn gluten meal, DDGS, soybean meal, and silage are tested against GB 13078 and international feed safety guidance. Multi-mycotoxin profiling is particularly valuable in animal nutrition because subclinical exposure to combined toxins reduces feed intake, immunity, and productivity in swine, poultry, and dairy cattle.
Dairy Products and Infant Foods
Raw milk, liquid milk, milk powder, cheese, infant formula, and baby foods are monitored for aflatoxin M1, the hydroxylated metabolite of aflatoxin B1 carried over from contaminated feed, with detection requirements at sub-microgram per kilogram levels.
Spices, Herbs, Coffee, Cocoa, and Beverages
Chili, paprika, black pepper, turmeric, nutmeg, roasted coffee, cocoa, grape juice, wine, and beer are screened for ochratoxin A, aflatoxins, and, in apple-derived products, patulin, reflecting the distinct contamination patterns of these high-value matrices.
Testing Items
A comprehensive simultaneous determination typically covers the following analyte groups, with method LOQs tailored to regulatory maximum limits:
- Aflatoxins B1, B2, G1, and G2 in food and feed matrices; aflatoxin M1 in dairy products (typical LOQ 0.01–0.05 µg/kg for M1 and 0.1–0.5 µg/kg for B/G aflatoxins)
- Deoxynivalenol (vomitoxin) and its modified forms, including 3-acetyl-DON, 15-acetyl-DON, DON-3-glucoside, and nivalenol
- Zearalenone and related resorcylic acid lactones, including alpha-zearalenol, beta-zearalenol, and zearalanone
- Ochratoxin A and ochratoxin B in cereals, dried fruit, coffee, cocoa, spices, wine, and beer
- Fumonisins B1, B2, and B3, primarily in maize and maize-based products
- T-2 toxin, HT-2 toxin, and diacetoxyscirpenol (DAS) from the type A trichothecene group
- Patulin in apple juice, cider, and fruit purees
- Sterigmatocystin and citrinin as emerging regulated toxins in grains and fermented foods
- Alternaria toxins, including alternariol, alternariol methyl ether, altenuene, tentoxin, and tenuazonic acid
- Ergot alkaloids and emerging Fusarium metabolites, including enniatins A, A1, B, and B1, and beauvericin
Testing Methods
Sampling and Sample Preparation
Because mycotoxin distribution in bulk lots is highly heterogeneous, representative sampling per Commission Implementing Regulation (EU) 2023/2782, Codex sampling plans, or GB/T sampling procedures is critical. Laboratory samples are finely milled and homogenized, and test portions of 5–25 g are extracted with acetonitrile/water mixtures, often acidified with formic or acetic acid. Stable isotope-labeled internal standards are added before extraction to compensate for matrix effects and recovery losses.
Cleanup Strategies
Sample extracts are purified using dispersive SPE (QuEChERS-type cleanup with C18, PSA, and magnesium sulfate), multifunctional purification columns, or broad-specificity immunoaffinity columns. Careful cleanup reduces co-extractive matrix burden, minimizes ion suppression in the MS source, and extends column lifetime while maintaining multi-analyte recovery.
UHPLC-MS/MS Determination
Chromatographic separation is performed on reversed-phase C18 or biphenyl columns using water/methanol or water/acetonitrile gradients containing ammonium formate and formic acid. Triple quadrupole mass spectrometers operate in electrospray ionization with rapid positive/negative polarity switching, acquiring at least two MRM transitions per compound for quantification and identity confirmation. Matrix-matched calibration or isotope dilution provides quantification across 2–4 orders of magnitude.
Confirmatory HPLC Methods
Where specified by regulation, aflatoxins are confirmed by HPLC with fluorescence detection after immunoaffinity cleanup and post-column photochemical or bromine derivatization in accordance with GB 5009.22, ISO 16050, and EN methods; ochratoxin A may be confirmed by HPLC-FLD per ISO 15141 and GB 5009.96; and patulin is determined by HPLC-UV or LC-MS/MS per GB 5009.185.
Rapid Screening
ELISA microplate assays and lateral-flow immunochromatographic strips are used for on-site or high-throughput screening of aflatoxin, DON, ZEN, OTA, and fumonisin in incoming grain and feed lots, with all presumptive positive results confirmed by LC-MS/MS.
Method Validation and Quality Control
Validated methods demonstrate linearity with R² above 0.99, recoveries typically within 70–120 percent, repeatability RSD below 20 percent, and LOQs at or below one-half of the applicable maximum limit, consistent with the performance criteria of the GB 5009 series, AOAC Official Methods, and EU method validation guidelines. Quality assurance includes procedural blanks, fortified matrix controls, duplicate analyses, and regular participation in interlaboratory proficiency testing schemes.
Applications
Simultaneous mycotoxin determination supports decision-making across the entire food and feed supply chain:
- Regulatory compliance testing for domestic market surveillance, customs clearance, and export certification against GB 2761, EU limits, and Codex maximum levels
- Verification of supplier declarations and certificate of analysis authenticity for grain traders, millers, and food manufacturers
- HACCP monitoring of critical control points in drying, storage, and transport to prevent fungal growth and toxin accumulation
- Feed safety management, including risk-weighted formulation, evaluation of mycotoxin binder efficacy, and protection of animal health and productivity
- Research into toxin co-occurrence, masked mycotoxin behavior during food processing, and dietary exposure assessment for risk analysis
- Root-cause investigation and contamination tracing following customer complaints or supplier non-conformities
FAQ
Why is simultaneous determination of multiple mycotoxins preferable to single-toxin testing?
Natural co-contamination means that testing one toxin at a time can miss clinically and commercially significant combinations. Multi-analyte LC-MS/MS provides a complete contamination profile from a single extraction, reduces cost per analyte, shortens turnaround time, and enables accurate assessment of total toxicological burden.
What detection limits can be achieved?
With modern UHPLC-MS/MS and isotope dilution, typical LOQs are approximately 0.1 µg/kg for aflatoxins B1, B2, G1, and G2, 0.005–0.05 µg/kg for aflatoxin M1, 1–5 µg/kg for ochratoxin A, 10–50 µg/kg for deoxynivalenol and fumonisins, and 1–10 µg/kg for zearalenone and T-2/HT-2 toxins, all comfortably below current regulatory maximum levels.
Which standards govern the analysis?
Method performance and limits are governed by GB 2761 (food mycotoxin limits), GB 13078 (feed limits), the GB 5009 series of national food safety standard analytical methods, ISO 16050 and ISO 15141 for cereal aflatoxin and ochratoxin A determination, relevant EN methods, AOAC Official Methods, and EU contaminant regulations with associated sampling and analysis provisions.
How much sample is required for submission?
Laboratories generally request 500 g to 1 kg of the raw commodity, or a minimum of 200 g of processed product, collected as a representative incremental composite. The laboratory then mills, homogenizes, and sub-samples the material before analysis.
Are masked or modified mycotoxins included?
Yes. Modern panels routinely include DON-3-glucoside, acetyl-DON derivatives, zearalenone metabolites, and emerging toxins such as enniatins and beauvericin, supporting both regulatory compliance and advanced risk assessment of total trichothecene and estrogenic exposure.
What is the typical turnaround time?
Following sample receipt and homogenization, validated simultaneous multi-mycotoxin analysis by UHPLC-MS/MS is typically completed within 5 to 10 working days, with expedited services available for urgent shipment release decisions.
Why Choose ZKGX?
- State-of-the-art analytical equipment
- Highly qualified scientific team
- Fast turnaround time
- Competitive pricing