Test Price:
$63 per analysis
Detection Limit:
0.3 mg/100g to 2 mg/100g, depending on sample weight
Sample Size Requirements:
10 grams for dry samples
20 grams for liquid samples
Equipment:
Fluorescence Spectrophotometer, Auto-analyzer with fluorescence detection
Reportable Units:
mg/100 grams
Turnaround Time:
7-9 business days
Is rush testing available?
Yes
Method Reference:
AOAC 967.22 with modifications and 984.26
Method Description:
Ascorbic acid is extracted into a methanol/metaphosphoric acid solution. The ascorbic acid is converted to dehydroascorbic acid that is reacted with orthophenylenediamine to form a fluorophor whose intensity is proportional to vitamin C concentration. A blank is simultaneously run on each sample to determine the level of background fluorescence. The total vitamin C content can be calculated by comparing the net fluorescence to a standard curve.
Information Required by Submitter:
Please supply an estimate of expected vitamin C content. Notify Medallion Labs if the vitamin C source in your sample is encapsulated. Samples of vitamin concentrates should be clearly labeled.
Additional Information:
This test is ISO/IEC 17025 accredited through A2LA, Certificate # 2769.01.
Vitamin concentrate results typically have higher-than-normal method variability.
Contact Us:
If you have questions about our testing services, please contact us at +1 (800) 245-5615.