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Product Name | L-Tryptophan | CAS No. | 73-22-3 |
L-Tryptophan | USP32 | AJI92 | CP2015 Injection Grade | EP8 |
Assay | 98.5-101.5% | 99.0-100.5% | ≥99.0% | 98.5-101.0% |
PH | 5.5~7.0 | 5.4~6.4 | 5.4~6.4 | / |
Specific rotation[a]D20 | / | -30.5°~32.5° | -30.0°~32.5° | -30.0°~33.0° |
Specific rotation[a]D25 | -29.4°~32.8° | / | / | / |
Transmittance(T430) | / | ≥95.0% | ≥95.0% | Clear & colorless ≤BY6 |
Chloride(Cl) | ≤0.05% | ≤0.02% | ≤0.02% | ≤0.02% |
Ammonium(NH4) | / | ≤0.02% | ≤0.02% | ≤0.02% |
Sulfate(SO4) | ≤0.03% | ≤0.02% | ≤0.02% | ≤0.03% |
Iron(Fe) | ≤30ppm | ≤20ppm | ≤20ppm | ≤20ppm |
Heavy metals(Pb) | ≤15ppm | ≤10ppm | ≤10ppm | ≤10ppm |
Arsenic | / | ≤1ppm | ≤1ppm | / |
Other amino acids | / | Conform | | Impurity A≤10ppm Sum of impurities with a retention time less than that of Tryptophan <100ppm Sum of impurities with a retention time great than that of Tryptophan and up to 1.8 time of N acetyltryptophan <300ppm |
Ninhydrin-positive substances | / | / | / | Conform |
Loss on drying | ≤0.30% | ≤0.20% | ≤0.20% | ≤0.50% |
Residue on ignition | ≤0.10% | ≤0.10% | ≤0.10% | ≤0.10% |
Endotoxin | / | / | <50EU/g | / |
Packing & Shipping
why choose our company
1. quality
our products meet msds safe standard and we have iso and other certificate so yan can get high quality products from our company.
2. price
we are the company which is the joint of trade and industry so we cao provide the competitive price and high quality product.
3.packing
we can do according to the customers' request.
4.transport
ems,dhl, tnt, ups ,fedex, by air, by sea
dhl express, fedex and ems for quantity less than 50kg, usually called as ddu service;
sea shipping for quantity over 500kg; and air shipping is available for 50kg above;
for high value products, please select air shipping and dhl express for safe;
5.service
we offer specialized logistic service including export declaration,customs clearance and every detail during shipment,this makes
us able to offer you one-stop service from the order to the products transported to your hand.
we will try our best to satisfied you.
1. tailor-made for every customers.
2. third-party test for the products you demand.
3. test your counter-samples and produce them for you.
4. best discount for old customers.
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