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|Minimum Order
Place of Origin:
China
Price for Minimum Order:
-
Minimum Order Quantity:
25 Kilogram
Packaging Detail:
25kg/drum
Delivery Time:
7 days
Supplying Ability:
15 Ton per Month
Payment Type:
Other, PayPal, Money Gram, Western Union, D/P, D/A, L/C, T/T
Contact Person Ms. Evelyn
Rm 2405, Unit 1, Buiding 1, Taiyin Tower jianghan Econmic Development Zone, Wuhan, Hubei
|
Item |
Specification( AJI*2) |
Results |
|
Identification |
Infrared absorption |
Conforms |
|
Stata of solution (transmittance) |
Clear and colorless Not less than *5.0%
|
*9% |
|
Specific rotation [α]D*0 |
*8.3°to *9.5° |
*9.1° |
|
Chloride(Cl) |
Not more than 0.*4% |
Not more than 0.*4% |
|
Ammonium (NH4) |
Not more than 0.*2% |
Not more than 0.*2% |
|
Sulfate(SO4) |
Not more than 0.**0% |
Not more than 0.**0% |
|
Iron(Fe) |
Not more than *0ppm |
Not more than 5ppm |
|
Arsenic (As2O3) |
Not more than 1ppm |
Not more than 1ppm |
|
Other amino acids |
Chromatographically Not detectable |
Conforms |
|
Heavy metals(Pb) |
Not more than *0ppm |
Not more than 5ppm |
|
Loss on drying |
Not more than 0.*0% |
0.2% |
|
Residue on ignition (sulfated) |
Not more than 0.*0% |
0.*5% |
|
Assay |
*9.0% to **1.0% |
*9.7% |
|
PH |
4.5 to 5.5 |
4.7 |
L-cysteine is recognized as a conditionally essential amino acid. Under normal physiologic conditions, the body can produce sufficient levels of L-cysteine. However, preterm infants cannot synthesize L-cysteine in the body; therefore it must be obtained via the diet.
Applications:
Cysteine, mainly the L-enantiomer, is a precursor in the food, pharmaceutical, and personal care industries. One of the largest applications is the production of flavors. For example, the reaction of cysteine with sugars in a Maillard reaction yields meat flavors.L-cysteine is also used as a processing aid for baking.
In the field of personal care, cysteine is used for permanent wave applications predominantly in Asia. Again the cysteine is used for breaking up the disulfide bonds in the hair's keratin.
Cysteine is a very popular target for site-directed labeling experiments to investigate biomolecular structure and dynamics. Maleimides will selectively attach to cysteine using a covalent Michael addition. Site-directed spin labeling for EPR or paramagnetic relaxation enhanced NMR also uses cysteine extensively.
In a ***4 report released by five top cigarette companies, cysteine is one of the **9 additives to cigarettes. Like most cigarette additives, however, its use or purpose is unknown. Its inclusion in cigarettes could offer two benefits: Acting as an expectorant, since smoking increases mucus production in the lungs; and increasing the beneficial antioxidant glutathione (which is diminished in smokers).
