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Colour Chart

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 

 

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