In the global Methylsulfonylmethane (MSM) market, understanding the difference between MSM assay (content) and purity is critical for accurate product evaluation. Many buyers confuse these terms, which can lead to misjudgments about quality.
Zhuzhou Hansen Chemicals Co., Ltd., a trusted MSM manufacturer, clarifies these key concepts for procurement professionals.
MSM Assay (Content)
MSM assay measures the total MSM percentage in a sample. Common methods include titration or gas chromatography (GC). According to USP standards, MSM content between 98.0% and 102.0% is acceptable. Values slightly above 100% are normal, resulting from analytical tolerance, calibration of reference standards, and moisture content. Assay primarily ensures compliance with international quality standards.
MSM Purity
MSM purity, especially GC purity, reflects the actual composition of the product, showing the proportion of genuine MSM versus impurities. Unlike assay, purity testing reveals the distribution of individual and total impurities, making it a critical indicator for pharmaceutical and dietary supplement applications.
Key Takeaways:
- Assay = total MSM measured (%), for compliance and regulatory acceptance.
- Purity = MSM versus impurities (%), for quality, safety, and application relevance.
- Slightly >100% assay is normal and not indicative of adulteration.
- Chromatographic purity provides deeper insight into impurity profiles.
By distinguishing MSM assay from purity, buyers can make informed decisions, ensuring product safety, efficacy, and compliance.
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