our focus on quality assurance reflected throughout the manufacturing process. starting materials of the highest quality are purchased from qualified vendors and carefully evaluated by our quality assurance department prior to use. this has helped zpc gaining a reputation from worldwide, we are constantly upgrading every aspect of our quality systems in terms of staff training, documentation and analytical capabilities to achieve the highest levels possible. the quality of our products is one of our most significant assets.

quality system

quality policy
training
qualified and trained personnel
manufacturing process controls
qc specifications
complete quality system with sop
environmental and facility controls
quality agreements
supplier qualification
audits and raw material qc testing / qa final release
qc laboratory controls
equipment calibration and maintenance
qualification and validation program
quality systems for change control and notification

each batch is provided with a lot-specific coa documenting specifications, test methods and results. some of the common tests found on a coa include:
color/appearance
water content
identity and purity by hplc
amino acid analysis
molecular weight
peptide content
acetate content
trifluoroacetic acid (tfa) content
related substances
residual solvents
mass balance
heavy metals
specific optical rotation
endotoxin
solubility