Test Swab Technical Information
Application of test-
Test Swab is a quick and easy way to accurately monitor the cleanliness of food equipment surfaces to help ensure food safety and product quality. Test Swab detects protein residues left on a surface after cleaning. Simply swab a surface, release the reagent and if food residue is present the reagent will turn purple. The color change provides a semi-quantitative measure of the surface cleanliness. The more contamination present, the quicker the color changes to purple and the darker the color. Test Swab quickly validates the hygiene of a surface, allowing immediate corrective action to be taken if necessary.
Test performance-
The reaction is time-dependent ie: the color develops with time and therefore it is important to record color change up to 10 min and disregard any color change after this set time. Most reactions happen within 60 seconds. Timing can be stopped as soon as any color change is observed. Test swab provides dirty or clean result as well as a how dirty result based on the speed of the reaction.
The reaction is also temperature-dependent and therefore it is important to allow the devices to come to room temperature (15 - 25°C) before use, if they have been stored at a different temperature.
Other reducing agents giving a positive result with Test Swab
This test also detects other substances capable of reducing the copper (Cu++ to Cu+) such as reducing sugars (glucose) and uric acid. Other strong reducing materials such as ascorbic acid (present in some fruit juices) or tannin (present in tea) may also give a positive result with
Test Swab.
Sensitivity performance-
20ug protein in 10 minutes at room temperature
10ug 10 minutes at 37°C
Swab concentration corresponding to color level
The chart below shows the color change associated certain dilutions of Protein. (μg/100μl)
1 2 3 4 Levels |
Detection |
Color Change |
Result |
1 |
0 - 15ug |
Lime green |
Pass |
2 |
20 - 60ug |
Grey/Light Purple |
Fail |
3 |
60 - 300ug |
Light Purple |
Fail |
4 |
>300ug |
Dark Purple |
Fail |
Summary of Products Tested |
||||
Product Category Detected Comments PRODUCT |
CATEGORY |
DILUTION |
DETECTED |
COMMENTS |
Ground Beef |
Meat |
Yes |
Level 4 within 10 min |
|
Beef Steak |
Meat |
Yes |
Level 4 within 10 min |
|
Processed Beef |
Meat |
1/10 |
Yes |
Level 3 after 5 min |
Processed Ham |
Meat |
Level 2 within 10 min |
||
Raw Chicken |
Meat |
1/10 |
Yes |
Level 4 after 5 min |
Cooked Chicken |
Meat |
1/10 |
Yes |
Level 3 after 5 min |
Raw Eggs |
Meat |
Level 4 within 10 min |
||
Shrimp |
Meat |
1/10 |
Yes |
Level 3 within 10 min |
Fish |
Meat |
1/10 |
Yes |
Level 4 within 10 min |
Pasteurized Milk |
Dairy |
1/10 |
Yes |
Level 4 within 10 min |
UHT Milk |
Dairy |
1/10 |
Yes |
Level 4 within 10 min |
Cream |
Dairy |
1/10 |
No |
Inhibits Signal |
Cheddar Cheese |
Dairy |
1/10 |
Yes |
Level 4 within 4 min |
Cottage Cheese |
Dairy |
1/10 |
Yes |
Level 4 within 10 min |
Yoghurt |
Dairy |
1/10 |
Yes |
Level 3 within 10 min |
Margarine |
Dairy |
1/10 |
No |
Not enough protein |
|
||||
Chocolate |
Confectionary |
1/10 |
Yes |
Level 4 within 2 min |
testswab@scigiene.com