Instructions and steps for portable potassium sorbate detector

1 Potassium sorbate

【Application field】

It is suitable for rapid quantitative determination of potassium sorbate in food.

【Reagent composition】

Potassium sorbate detection reagent A

1 bottle

Potassium sorbate detection reagent B

1 bottle

【Reagent storage, expiration date and precautions】

The reagent has a shelf life of 12 months under normal temperature and dark conditions. Please use it within the validity period.

The reagent is corrosive or toxic. When using the test reagent, the tester must wear protective glasses and gloves. If the reagent touches the eyes, skin, etc., immediately rinse with plenty of water.

【Sample extraction】

Weigh 2g of minced sample in a red-capped plastic bottle, add 40ml of water to shake and extract for 5min, then take it out and filter it into another red-capped plastic bottle as a test solution for use.

【Sample testing】

Blank calibration: add 10ml of distilled water to a 10ml colorimetric tube, 0.5ml of sorbic acid A reagent, shake well, put in a boiling water bath, let stand for 3 minutes, after taking out, add 0.5ml of reagent B while hot, shake and put in Leave in a boiling water bath for 5 minutes; then put the wiped cuvette in the detection channel for blank correction.

Sample detection: add 10ml of sample solution to the 10ml colorimetric tube, 0.5ml of sorbic acid A reagent, shake well, put in a boiling water bath, let stand for 3 minutes, after taking out, add 0.5ml of reagent B while hot, shake Put it in a boiling water bath and let it stand for 5 minutes; add it to the cuvette, and then put the wiped cuvette into the detection channel of the instrument for measurement.

【Result judgment】

Then compare the test result with the limit standard of potassium sorbate in "GB2760-2014 National Food Safety Standard Food Additive Use Standard" to judge whether it exceeds the standard.

National standard limit of sorbic acid and its potassium salt in food (GB2760-2014)

Serial number

Food name

Maximum usage

(g / kg)

Serial number

Food name

Maximum usage

(g / kg)

1

cottage cheese

1.0

twenty one

Cooked meat products

0.075

2

Hydrogenated vegetable oil

1.0

twenty two

Meat enema

1.5

3

Margarine and similar products (such as a mixture of butter and margarine)

1.0

twenty three

Prefabricated aquatic products (semi-finished products)

0.075

4

Flavored ice, popsicles

0.5

twenty four

Air-dried, dried, pressed and dried aquatic products

1.0

5

Surface-treated fresh fruits

0.5

25

Other aquatic products and their products (only ready-to-eat jellyfish)

1.0

6

jam

1.0

26

Egg products (change their physical properties)

1.5

7

Candied cold fruit

0.5

27

Seasoning syrup

1.0

8

Surface treated fresh vegetables

0.5

28

vinegar

1.0

9

Pickled vegetables

0.5

29

soy sauce

1.0

10

Pickled vegetables (only ready-to-eat dried bamboo shoots)

1.0

30

Sauces and sauce products

0.5

11

Processed edible fungi and algae

0.5

31

Compound seasoning

1.0

12

Dried beans

1.0

32

Beverages (except 14.01 packaged drinking water)

0.5

13

New soybean products (soybean protein puffed food, soy vegetarian meat, etc.)

1.0

33

Concentrated fruit and vegetable juice (pulp) (for food industry only)

2.0

14

Gum candy

1.5

34

Lactic acid bacteria drink

1.0

15

Sweets other than gum-based sweets

1.0

35

Mixed wine

0.4

16

Other miscellaneous grain products (only miscellaneous grain enema products)

1.5

36

wine

0.2

17

Instant rice noodle products (only rice noodle enema products)

1.5

37

wine

0.6

18

bread

1.0

38

jelly

0.5

19

pastry

1.0

39

Collagen casings

0.5

20

Baking food stuffing and hanging paste for surface

1.0

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