Reading Purity: What Phycocyanin Grades Mean for Pharma and Research Buyers

Phycocyanin is not a single commodity but a graded material, and the grade is defined primarily by purity. Understanding how purity is expressed helps pharma and research buyers avoid both overpaying for unneeded purity and under-specifying for a sensitive application.

The purity convention

Phycocyanin purity is commonly expressed as the ratio of absorbance at 620 nm (the pigment's characteristic peak) to absorbance at 280 nm (total protein). A higher ratio indicates a purer phycocyanin preparation. Food-grade material sits at the lower end of this scale, while reactive, analytical, and diagnostic grades climb progressively higher.

Matching grade to application

• Food and beverage colorant: lower purity grades are sufficient.
• Cosmetic and nutraceutical actives: intermediate purity.
• Research, reactive, and diagnostic use: high-purity grades, where consistency and documentation are critical — the territory of an advanced technical grade such as E40.

Why higher grades cost more

Reaching higher purity requires additional purification steps, tighter process control, and more rigorous testing. The premium reflects reproducibility and documentation as much as the pigment itself.

The buyer takeaway

Specify the grade your application actually needs, and require documentation that proves consistency. For 2027 planning, aligning on grade and specification early prevents costly requalification.

Forward-looking note: SPIRUVA is in a pre-launch phase, with commercial production scheduled for July 2027. The above reflects general industry conventions, not product-specific claims.