Y-Soy sauce total acid and amino nitrogen speed test reagent

Product Introduction

Test principle

Soy sauce is in the amino nitrogen content of amino acids characteristic index, the higher the concentration the stronger the flavor of soy sauce, the better the quality.

Reagent constitute (greater than 25 times)

1. Soy sauce determination of total acid and amino acid nitrogen liquid (25ml) 2 bottles

2. Soy sauce color-developing agent (5ml) 1 bottle

Operation and Decision of Soy Sauce

Take 1.0ml samples to 10 ml colorimetric tube, and add water (distilled water or pure water) to the 10.0ml scale. Then cover plug and mixing, take 1.0ml mixing solution into 100ml Erlenmeyer flasks, and add 60ml water solution (if the deeper the color, can be appropriate to increase water quantity, but should pay attention to in blank solution experiment added amounts of water), add 4 drops of color reagents, and then shake the tube, use the tube upright in a drop to a drop of total acid and amino acid nitrogen determination solution, each 1 drops would be shake evenly, after the solution showed Pink, stop titration, the per determination of liquid droplets is equivalent to 0.45% grams of total acids total acid content ( if the determination of fluid consumed 6 drops have not significantly pink, total acid standard, should be sent to the laboratory, more precise and quantitative ) was added to the solution of 10.0ml 36% formaldehyde solution, continue to use the determination of titration to pink, per drop determination the equivalent of 0.078% g of amino acid nitrogen to calculate its content. Detection before should first do a solution blank test (understanding without sample an equal amount of water consumed and formaldehyde solution Determination of liquid drops), such as 11 drops of liquid sample consumption determination of blank solution, 7 drops of liquid sample determination, actual consumption of 4 drops of liquid, the samples of amino acid nitrogen the content of 4 x 0.078% = 0.31% g, for unqualified products.

Announcements

1. During titration, pay attention to the tube upright to reduce the error.

2. Should consider the error existence in the spot. For the sample not reach the standard, should be send to the lab for test again. The period validity of test solution is 12 months.