Test Price:
$255 per analysis
Acceptable Matrices:
Cereal grains, doughs, pastas, and vegetables
Detection Limit:
0.01 units/gram
Sample Size Requirements:
20 grams
Equipment:
UV/Vis spectrophotometer, homogenizer, microplate reader
Reportable Units:
Units per gram with one unit defined as the change in absorbance at 410nm per minute from the formation of 1.2 benzoquinone.
Turnaround Time:
7-9 business days
Is rush testing available?
Yes
Method Reference:
Anderson JV and Morris CF (2001) Crop Science 41:1697-1705.; AACC 22-85
Method Description:
Samples are homogenized and enzymes are extracted into a cold, pH 6.5 buffer. A protein determination by the Bradford method is performed on the enzyme extract (supernatant) to normalize subsequent enzyme results to the efficiency of the protein extraction. The enzyme extract is mixed with catechol and Polyphenol Oxidase activity is measured spectrophotometrically by the rate of formation of 1,2 benzoquinone at 410nm.
Information Required by Submitter:
Estimates of activity (if available) and composition of the sample matrix.
Additional Information:
Please keep and ship samples frozen, if possible.
Contact Us:
If you have questions about our testing services, please contact us at +1 (800) 245-5615.