AOAC ERP Gluten Assays - Dec 2018
Run 1 and Run 2 using test samples 1 – 42 and (if necessary) further dilutions for Run 3
1. Please make sure that all components have reached room temperature (20‐25 °C, 68‐77 °F) before continuing. 2. The washing buffer is delivered as 10x concentrate. Please dilute before use according to the instructions for use (10.1). 3. You will need the following components to perform the procedure described afterwards: bag with microtiterplate, bag with pre‐plate, six standards, conjugate, wash buffer, substrate/chromogen, stop solution 4. Open the microtiter plate bag which is labeled with “Total Gluten” and insert 7 strips into the microwell holder. For the recommended plate layout please refer to the data return sheet. 5. Six standards and 21 sample extracts should be pipetted in duplicate on a pre‐plate (uncoated) to speed‐up the transfer to the coated plate. Therefore, pipette at least 150 µl of each standard, sample extract or buffer according to the pipetting scheme on this plate which is clearly marked with “PRE‐PLATE” on the small site of the plate and on the label of the bag. 6. By using an 8‐channel multi pipette, transfer exactly 100 µl of the solutions quickly to the coated plate. Pre‐flush the tips with the standard or sample solution and use each tips only once. In case of any doubts contact the manufacturer of this pipette or the study director. Cover the plate. Remember: the reaction starts when the first solution is added to the coated plate. 7. Incubate for 20 minutes at room temperature (20 ‐ 25 °C, 68 ‐ 77 °F). 8. Pour the liquid out of the wells and tap the microwell plate upside‐down vigorously (three times) against absorbent paper to ensure complete removal of liquid from the wells. Fill all wells with 250 µL of diluted washing buffer and pour out the liquid again. Repeat two additional times. Washing is very important, thus please make sure to empty the wells completely by vigorous tapping each time. If you are not sure whether you have washed two or three times, wash once more. 9. Add 100 µL ready‐to‐use conjugate to each well and cover the plate. 10. Incubate for 20 minutes at room temperature (20 ‐ 25 °C, 68 ‐ 77 °F). 11. Pour the liquid out of the wells and tap the microwell plate upside down vigorously (three times) against absorbent paper to ensure complete removal of liquid from the wells. Fill all wells with 250 µL of diluted washing buffer and pour out the liquid again. Repeat two additional times. Washing is very important, thus please make sure to empty the wells completely by vigorous tapping each time. If you are not sure whether you have washed two or three times, wash once more. 12. Add 100 µL of reddish Red Chromogen Pro solution to each well and cover the plate. 13. Incubate for 10 minutes (20 ‐ 25 °C, 68 ‐ 77 °F) in the dark . 14. Add 100 µL of stop reagent to each well. Mix gently by shaking the plate manually and measure the absorbance at 450 nm against an air blank. Read within 10 minutes after addition of the stop solution. Write down the absorbances in the data return sheet
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