Description
COA-BACKED NUTRITIONAL INGREDIENT
L-Cystine for B2B Formulation
L-Cystine is supplied as a single-entity amino acid for B2B nutrition, beverage and supplement formulation. The purchasing definition is the declared assay, the impurity profile and the physical form rather than a botanical identity.
COA-Backed Specification
| Identity | L-Cystine |
|---|---|
| CAS No. | 56-89-3 |
| Form and colour | White crystalline powder |
| Assay | 98.5%-101.0% on dried basis |
| Method | HPLC |
| Particle size | 98% through 80 mesh |
| Loss on drying | <=5.0% |
| Ash | <=5.0% |
| Heavy metals | Within the limits of the approved specification |
| Microbiological limits | Within the limits of the approved specification |
| Representative batch | LXGB260710 |
| Manufacture date | 10 Jul 2026 |
| Shelf life | Two years when stored properly |
Representative values do not replace the current shipment COA.
Buyer Decision Guide
L-Cystine is specified on assay, specific rotation or chiral purity where relevant, and on heavy metal and microbiological limits. Confirm which of these your finished-product specification actually controls before approving a grade.
- Confirm assay basis and analytical method
- Check the salt or free-form identity: L-Cystine
- Review specific rotation or chiral purity if applicable
- Confirm heavy metal and microbiological limits
How This Grade Differs
L-Cystine is a single-entity amino acid. It is not interchangeable with the racemic or salt form of the same molecule, and not with a plant extract that merely contains it. Compare assay basis, salt form and impurity profile when substituting.
Compare these related grades before approval:
For a substitution review, compare botanical identity, plant part, assay target, analytical method, physical form and the current offered-batch COA.
Application Areas
- Sports nutrition and amino acid blends
- Functional beverages and instant drink powders
- Capsules, tablets and stick packs
- Clinical and enteral nutrition projects
Packaging and Delivery
- Evaluation sample typically 10-20 g, subject to stock
- Regular MOQ typically 1 kg
- 1 kg foil bag or 25 kg fibre drum with inner food-grade liner
- Custom packing and private-label options subject to confirmation
- Typical lead time 7-15 working days after deposit
Quality and Documentation
Representative batch LXGB260710 supports the specification table above. Use the cited record for preliminary comparison and request the offered-lot COA for final technical approval. Batch COA, specification sheet, agreed third-party testing and export documents are available for buyer verification.
Frequently Asked Questions
What shelf life and storage conditions apply?
Two years when stored properly, kept sealed in a dry place away from light and heat.
How is L-Cystine Powder 98.5% quantified?
By HPLC against the specification figure of 98.5%-101.0% on dried basis.
Is the mesh size fixed or adjustable?
Standard supply is 98% through 80 mesh, and alternative cuts can be agreed in the written specification.
Which safety parameters are tested every lot?
Moisture <=5.0%, ash <=5.0%, heavy metals and microbiology against the approved specification.
What physical form does L-Cystine Powder 98.5% ship in?
White crystalline powder, milled to 98% through 80 mesh.
What is the usual lead time?
Regular production normally takes 7-15 working days after deposit, depending on stock, volume, testing and customisation requirements.
Are you a manufacturer or a trading company?
LongBio is Shaanxi Longsheng Biotechnology Co., Ltd., a direct manufacturer of botanical extracts and functional ingredients integrating R&D, production and export support. Factory review can be arranged by video or an on-site visit.
How is the material shipped?
Air and sea freight are both arranged, with the mode chosen against volume, destination and required date. Documents and the HS code are issued with the shipping instructions.
Request COA, Sample or Quotation
Send your target specification, application, order quantity, destination country and required test limits.
Get the current batch COA, a sample or a quotation
