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Vitamin B1 (Thiamin) Test

  • Price

    $95 per analysis

  • Turnaround time

    7 - 9 Business Days

  • Rush


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You can expect high-quality, reliable results time after time.

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Vitamin B1 (Thiamin) Test

Technical data sheet


Method description

Samples are extracted by autoclaving in HCl to breakdown the matrix. A buffer and enzyme are added to convert any thiamin phosphate to thiamin. Alkaline potassium ferricyanide is added to the filtrates to oxidize and convert thiamin to thiochrome. The thiochrome is extracted into iso-butyl alcohol and measured fluorometrically. Blanks are determined by adding NaOH instead of ferricyanide. The thiamin level is determined by comparing the net fluorescence to a standard curve.

Acceptable matrices

Food and Food Ingredients

Limit of quantitation

0.02 mg/100g to 0.1 mg/100g, depending on sample weight


Fluorescence Spectrophotometer, Auto-analyzer with fluorescence detection

Method reference

AOAC 942.23, 970.65 and 981.15

Reportable unit


Sample size requirements

10 g

Information required by submitter

Please supply an estimate of expected thiamine content and indicate the presence of high levels of iron. Samples of vitamin Concentrates should be clearly labeled.

Additional information

This test is ISO/IEC 17025 accredited through A2LA, Certificate # 2769.01.

*Prices and offerings are subject to change without notice.

Common Vitamin B1 (Thiamin) Test Testing Questions

While our sales and customer service team are happy to answer general testing questions, consultations typically start at a rate of $250 per 30 minutes regarding the interpretation of reported test results or questions about our test methods. We cannot consult on regulations, tolerance limits, or claims.

We make every effort to keep our methods and detection limits up to date according to the latest standards and qualifications. If you have any questions regarding the limit of detection/quantification or method references, please contact our Customer Service team at 1-800-245-5615.

Our standard turnaround time is 10 business days for most assays. There are some assays that require a longer turnaround time. We also offer a RUSH service that is half the time of the standard turnaround time of the assay at double the cost of the assay. A few assays that we provide cannot be rushed due to the nature of the test. Please check the specific assay you are interested in regarding the ability to RUSH the turnaround time.

Medallion Labs, a division of General Mills, offers multiple areas of expertise for analytical testing and product evaluation for the food and ingredient industry. Our areas of expertise include Chemical Analysis, Nutritional Analysis, Food Safety, Shelf Life Studies, Microbiology, Specialty Fibers, Physical Testing, Allergen Testing, as well as Product Evaluation (which includes Product Performance and Sensory Evaluation) and Technical Consulting/Method Development. Our methods are developed for the testing of food products and ingredients.

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Medallion Labs

A food testing program designed with mid-market and enterprise food and ingredient manufacturers in mind.