BAC Water (Bacteriostatic Water)

BAC Water is sterile water containing 0.9% benzyl alcohol as a preservative, supplied as a supporting reconstitution and formulation ancillary. The preservative limits microbial growth after repeated vial entry, while compatibility with the specific peptide or active must be confirmed before use. Cupratec supplies BAC Water in 3 ml, 10 ml, and 30 ml sterile vial formats. The release documentation identifies the fill volume and benzyl-alcohol content and covers sterility and bacterial endotoxin. Preservative-free sterile water should be selected where benzyl alcohol is incompatible with the material or downstream workflow.

Release specification for BAC Water (Bacteriostatic Water): ≥ 99.0% (component-wise for blends) by RP-HPLC, mass-spec confirmed identity, Karl-Fischer water content, and counter-ion quantitation. The COA is batch-specific (each lot has its own document, not a generic data sheet) and includes the chromatogram and mass spectrum as image attachments. Optional add-ons available per request: bacterial endotoxin testing, USP microbial limits, and sequence verification by tandem MS, useful for first-time qualification of a new supplier.

Lyophilized BAC Water (Bacteriostatic Water): store at Room temperature, protect from light. The typical re-test period is 24 months from manufacture date when held under these conditions; a current re-test date is printed on the COA so buyers approaching the limit can schedule confirmation testing rather than auto-discard. After reconstitution, aliquot and freeze; repeat freeze-thaw cycles are the dominant source of in-lab degradation and should be limited to three or fewer for analytical work.

Commercial terms on BAC Water (Bacteriostatic Water): MOQ On request, lead time 7–14 days from confirmation. Volume pricing is offered in tiers, typical break points are 10 g, 100 g, 1 kg, and 10 kg, with separate contract-fill pricing for vialed product. Quotes include the per-unit price, INCOTERMS (DDP recommended for most pharmacy and lab buyers; EXW or FCA for buyers with their own forwarder), payment terms, and the analytical packet scope. First reply is hand-written by a regulatory specialist within 24 business hours; we deliberately do not auto-respond because the first email is where the destination-specific compliance questions get asked.

Custom-blend products in this category combine two or more peptides at a defined ratio in a single lyophilized vial. BAC Water (Bacteriostatic Water) ratio verification is performed by quantitative HPLC against reference standards of each component: the chromatogram on the batch COA shows the individual peaks with integrated peak areas and the ratio computed against the target. For private-label buyers who want to publish or audit the ratio, the underlying chromatograms and the ratio calculation are available as raw-data attachments to the COA. Custom ratios beyond our standard catalog are routine, the contract-synthesis workflow defines the target ratio, the analytical method to confirm it, and the documentation scope as part of the development brief.

For a custom blend not in the standard catalog, the development workflow runs roughly 6-10 weeks from signed brief through first sample shipment, then 7–14 days for commercial-scale production thereafter. Sample-stage MOQ is typically 5-10 g of finished blend (enough to support the buyer's own stability and bioassay work); commercial MOQ depends on the components, for sequences priced in the high three figures per gram (the GLP-1 class), a pilot commercial run starts around 100 g, whereas for cosmetic and repair sequences the typical first commercial run is 500 g to 1 kg. Pricing and timeline tighten significantly on repeat orders once the synthesis route is locked.