Quality control methods for

Lactochloral TS. 
Procedure. Dissolve 50g of chloral hydrate R in 50g of lactic acid R by gentle 
heating. 
Lactophenol TS. 
Procedure. To a mixture of 20g of lactic acid R and 40g of glycerol R dissolved in 
20 ml of water, add 20g of phenol R and mix. 
Lactose R. C
12
H
22
O
11
. 
A suitable commercially available reagent. 
Lead acetate R. C
4
H
6
O
4
Pb,3H
2
O. 
A suitable commercially available reagent. 
Lead acetate (80 g/l) TS. A solution of lead acetate R in freshly boiled water 
containing about 80g/l of . C
4
H
6
O
4
Pb (approximately 0.25mol/l). 
Lithium chloride R. LiCl. 
Description. White, deliquescent crystals or granules. 
Solubility. Freely soluble in water; soluble in acetone R and ethanol (∼750g/l) TS. 
Storage. Store in a tightly closed container. 
A suitable commercially available reagent. 
L
-Lysine R. C
6
H
14
N
2
O
2
. 
Description. Crystalline needles or hexagonal plates. 
Solubility. Soluble in water; very slightly soluble in ethanol (∼750g/l) TS; 
insoluble in ether R. 
Melting point. About 213°C with decomposition. 
Specific optical rotation. Dissolve 0.2g in 10ml of hydrochloric acid (∼250g/l) TS; 
= about +21.5°. 
[ ]
C
20
D
α
°
A suitable commercially available reagent. 
Magnesium chloride R. MgCl
2
,6H
2
O. 
A suitable commercially available reagent. 

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Quality control methods for medicinal plant materials