USD $1.00-6.00 / Kilogram
USD $1.00-10.00 / Kilogram
USD $1.00-6.00 / Kilogram
USD $1.00-6.00 / Kilogram
USD $2.00-5.00 / Kilogram
USD $2.00-6.00 / Kilogram
USD $2.00-5.00 / Kilogram
USD $2.00-5.00 / Kilogram
USD $1.00-6.00 / Kilogram
l-cystine
properties:white crystal or crystalline powder, odorless, flavorless, almost insoluble in water or ethanol, soluble in diluted acid or basic hydroxide solutions.
quality index:
item
|
index
|
specific rotatory power[α] d20
|
-215º -225º
|
clarity
|
≥ 98.0%
|
ammonium salt[nh4]
|
≤ 0.02%
|
chloride[cl]
|
≤ 0.02%
|
residue on ignition
|
≤ 0.10%
|
sulfate[so4]
|
≤ 0.02%
|
iron salt[fe]
|
≤ 10 ppm
|
heavy metal[pb]
|
≤10 ppm
|
arsenic salt
|
≤1 ppm
|
other amino acid
|
color layer can not be checked out.
|
loss on drying
|
0.20%
|
content
|
98.5 -101.0%
|
use:
used in biochemical research, nutrient; cure congenital cystinuria etc..
storage:
stored in sealed container at room temperature.
packing:
packed in cardboard drum with the lining of two layers of plastic bags. nw:25 kg per drum.
l-cystine
properties:white crystal or crystalline powder, odorless, flavorless, almost insoluble in water or ethanol, soluble in diluted acid or basic hydroxide solutions.
quality index:
item
|
index
|
specific rotatory power[α] d20
|
-215º -225º
|
clarity
|
≥ 98.0%
|
ammonium salt[nh4]
|
≤ 0.02%
|
chloride[cl]
|
≤ 0.02%
|
residue on ignition
|
≤ 0.10%
|
sulfate[so4]
|
≤ 0.02%
|
iron salt[fe]
|
≤ 10 ppm
|
heavy metal[pb]
|
≤10 ppm
|
arsenic salt
|
≤1 ppm
|
other amino acid
|
color layer can not be checked out.
|
loss on drying
|
0.20%
|
content
|
98.5 -101.0%
|
use:
used in biochemical research, nutrient; cure congenital cystinuria etc..
storage:
stored in sealed container at room temperature.
packing:
packed in cardboard drum with the lining of two layers of plastic bags. nw:25 kg per drum.