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Experiment 1 The Description£¬ Identification and Tests of

Glucose

I. Purpose

1. To understand the aims and purposes of the drug quality control.

2. To learn about the methods for the determination and the special words for the description

of the characteristics of drugs.

3. To experiment on the identification of glucose. 4. To study and experiment on the methods of drug tests

2. Contents and teach time assignment

Description Colourless crystals or a white crystalline or granular powder£» odourless£» taste, sweet. Dissolubility--------------------------------(60min)

Specific optical rotation Polarimeter --------------------------------(120min) Identification announcements--------------------------------(60min)

(1) Dissolve about 0.2 g in 5 ml of water£¬ add dropwise hot alkaline cupric tartrate TS£» a red

2

precipitate of cuprous oxide is produced. examination ------------------------------(120min)

Acidity Dissolve 2.0 g in 20 ml of water, add 3 drops of phenolphthalein IS and 0.20 ml of sodium hydroxide (0.02 mol/L) VS; a pink colour is produced.

Chloride Carry out the limit test for chlorides (Appendix VIII A)£¬ using 0.60 g. Any opalescence produced is not more pronounced than that of a reference using 6.0 ml of sodium chloride standard solution (0.01%).

Heavy metals Dissolve 4.0 g in 23 ml of water£¬ add 2 ml of sodium acetate BS (pH 3.5)£¬ carry out the limit test for heavy metals (Appendix VIII H£¬ method 1): not more than 0.0005%. Arsenic (Appendix VIII J£¬ method 1) (0.0001%).

References

the Volumn 2 of Chinese Pharmacopoeia

Focal point

The use of Polarimeter

How to use and clear the color comparison tube How to figure out the limit of arsenic or heavy matals

Discussion

1. What are the purposes of drug identification and test? What are the usual items of drug

tests?.

2. What are the standard operation procedures for the clarity test?

3. How much of the lead standard solution should be taken for the limit test for heavy

metals in this experiment?

4. What precautions should be taken for the limit test for arsenic(Appendix VIII J£¬ method

1)? And what is the function for each of the test solutions added?

5. Figure out the amount of the arsenic standard solution that should be taken for the limit

test for arsenic(Appendix VIII J£¬ method 1) (0.0001%) in this experiment with the specified quantity of 2.0 g of sample.

teaching device

100ml volumetric flask; 10ml centrifuge tube; polarimeter; color comparison tube; arsenic test bottle

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