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Impurity reference standards

Impurity Reference Standards
Impurity reference standards are physical benchmarks for implementing pharmaceutical quality standards. They serve as critical carriers for metrological traceability, acting as specialized tools to assess drug quality, establish measurement baselines, determine drug authenticity and efficacy, and calibrate testing instruments and methodologies. Within national drug standards, they are state-issued reference materials for both quantitative and qualitative analysis of pharmaceuticals.

Primary Functions

1.Quality Control Applications:

Used as standard substances for drug identification, purity testing, and content determination.
Function as specialized "measuring tools" that directly impact the accuracy and reproducibility of test results.

2.Targeted Impurity Control:

Essential for increasingly stringent impurity profiling, including localization, quantification, and response factor determination of specific impurities mandated by modern pharmacopeial standards.

Selection Criteria

1.Source Availability:

Common Process-Related Impurities (e.g., by-products) are typically obtainable from pharmacopeial authorities (USP, EP) or certified suppliers (e.g., LGC).
Unique or Rare Impurities often require in-house synthesis, extraction, or isolation. Such impurities lack commercially available reference standards and necessitate method development, validation, and calibration to enable accurate quantification in active pharmaceutical ingredients (APIs).

2.Critical Parameters for Procurement:

Purity: The cornerstone of reference standard quality (e.g., ≥98% by HPLC).
Shelf Life: Indicates stability under specified storage conditions.
Documentation: Complete Certificate of Analysis (COA) and spectral data (e.g., NMR, LC-MS).
Supplier Credentials: ISO/IEC 17034 accreditation, GMP compliance, and traceability to international standards.

Hengyuan Fine Chemical’s PCL Impurity Reference Standards
Hengyuan Fine Chemical supplies PCL-branded impurity reference standards with the following advantages:

Full Documentation: Batch-specific COA and spectral data provided.
Direct Manufacturing Supply: Eliminates intermediaries, ensuring cost-effectiveness and rapid delivery.
Comprehensive Portfolio: Covers a wide range of pharmacopeial and custom-synthesized impurities.
Regulatory Readiness: Supports compliance with ICH, USP, and ChP requirements.

Product Number	Product Name	CAS No.	Molecular Formula
Product Number:PCL-#-Chp0125-50mg	Product Name:Zidoramidovudine tablets impurity V Salicylic acid	CAS No.:69-72-7	Molecular Formula:
Product Number:PCL-#-Sc003-25mg	Product Name:Sodium carboxysulfonate impurity L	CAS No.:N/A	Molecular Formula:
Product Number:PCL-#-Qu008-100mg	Product Name:Quetiapine fumarate impurity H,	CAS No.:1076199-40-0	Molecular Formula:
Product Number:PCL-#-Bz0422-50mg	Product Name:Nifedipine impurity 7 (mixture of cis and trans isomers)	CAS No.:108139-78-2	Molecular Formula:
Product Number:PCL-#-Is087-250mg	Product Name:2-Pyridinecarbohydrazide	CAS No.:1452-63-7	Molecular Formula:
Product Number:PCL-#-Di124-50mg	Product Name:Dexmedetomidine impurity 8 5-( 1-phenylethyl)-1H-imidazole	CAS No.:881409-85-4	Molecular Formula:
Product Number:PCL-#-Di121-100mg	Product Name:Diphenylformyl-L-tartaric acid; (-)-Di-o-benzoyl-L-tartaric acid; (2R,3R)-2,3-bis(phenylmethoxy)butanedioic acid	CAS No.:2743-38-6	Molecular Formula:
Product Number:PCL-#-Su0313-100mg	Product Name:Ethyl 2-methoxy-5-sulfamoylbenzoate; Sulpiride EP impurity C	CAS No.:33045-53-3	Molecular Formula:
Product Number:PCL-#-Bz0152-50mg	Product Name:Allopurinol impurity C	CAS No.:1346604-13-4	Molecular Formula:
Product Number:PCL-#-De105-10mg	Product Name:Dextromethorphan hydrobromide impurity D	CAS No.:N/A	Molecular Formula:
Product Number:PCL-#-Chp0303-50mg	Product Name:Tolansetron hydrochloride impurity III (alpha-tropinol)	CAS No.:120-29-6	Molecular Formula:
Product Number:PCL-#-Bz0034-50mg	Product Name:Pantoprazole impurity E	CAS No.:2115779-15-0	Molecular Formula:
Product Number:PCL-#-Ch052-100mg	Product Name:6-Chloro-1,2,3,4-tetrahydroisoquinoline	CAS No.:33537-99-4	Molecular Formula:
Product Number:PCL-#-Ol002-20mg	Product Name:Isopropyl isoxylate	CAS No.:56427-76-0	Molecular Formula:
Product Number:PCL-#-Bz0118-50mg	Product Name:Terbutaline impurity 2	CAS No.:50841-46-8	Molecular Formula:
Product Number:PCL-#-Bz0348-50mg	Product Name:Nimodipine impurity B	CAS No.:21881-78-7	Molecular Formula:
Product Number:PCL-#-Qu021-50mg	Product Name:Quetiapine EP impurity W,	CAS No.:1800608-95-0	Molecular Formula:
Product Number:PCL-#-Fo103-200mg	Product Name:Fosaprepitant impurity 43; Fosaprepitant impurity 19	CAS No.:1623-07-0	Molecular Formula:
Product Number:PCL-#-Bz0378-50mg	Product Name:Prucalopride intermediate 3 impurity 6	CAS No.:1599434-55-5	Molecular Formula:
Product Number:PCL#-Cy020-20mg	Product Name:1,1-Cyclobutanedicarboxylic acid	CAS No.:5445-51-2	Molecular Formula: