Quality control methods for

 
D
-Xylose R. C
5
H
10
O
5
. 
Description. A white, crystalline powder. 
Specific optical rotation. Dissolve 1g in 10 ml of water; 
[ ]
C
20
D
α
°
= about +20°.
A suitable commercially available reagent. 
 
Yeast extract, water-soluble, R. 
A suitable commercially available reagent. 
 
Zinc R, Zn; granulate, powder, or dust. 
A suitable commercially available reagent. 
 
Zinc, AsR, granulated. Granulated zinc R that complies with the following tests: 
Limit of arsenic. Add 10ml of stannated hydrochloric acid (∼250g/l) AsTS to 50ml 
of water, and apply the general test for arsenic; use 10 g of granulated zinc R and 
allow the reaction to continue for 1 hour; no visible stain is produced. 
Test for sensitivity. Repeat the test for arsenic with the addition of 0.1 ml of dilute 
arsenic AsTS; a faint, but distinct yellow stain is produced. 
 
Zinc acetate R. C
4
H
6
O
4
Zn,2H
2
O. 
A suitable commercially available reagent. 
Zinc acetate/aluminium chloride TS. 

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Quality control methods for medicinal plant materials 
Procedure. Dissolve 200g of zinc acetate R and 5g of aluminium chloride R in 
sufficient water to produce 1000 ml. 
 
Zinc chloride R. ZnCl
2
. 
A suitable commercially available reagent. 
 
Zinc chloride, iodinated, TS. 
Procedure. Dissolve 40 g of zinc chloride R and 13 g of potassium iodide R in 21 
ml of water. Add 1g of iodine R and shake for 15 minutes. Filter if necessary. 
Storage. Store protected from light. 

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Quality control methods for medicinal plant materials