What Is Phycocyanin?
Phycocyanin is a blue pigment-protein complex associated with spirulina biomass. Commercial blue extracts are produced through extraction and separation, followed by concentration and, for powder formats, drying.
It is different from whole spirulina powder. Whole biomass contains a broader mixture of proteins, pigments and other constituents and normally has a different color, flavor and formulation behavior.
For buyers, “blue spirulina” is not a complete specification. Identify the source organism as declared by the supplier, extraction type, supplied format, color strength and full composition.
Color Value, Purity Index and Content Are Different
| Measurement | What It Describes | What It Does Not Establish |
|---|---|---|
| Color value | Optical color strength under a defined procedure | A universal phycocyanin mass percentage or shelf-life guarantee |
| A620/A280 ratio | A spectroscopic purity index comparing absorbance at two wavelengths | A direct percentage purity, food authorization or contaminant clearance |
| Phycocyanin content | A quantitative or method-calculated content result | Identical visual shade or performance in every formula |
| Protein content | Protein measured under the stated method | That all measured protein is phycocyanin |
How to Compare Color-Value Results
Different concentration conventions and calculation procedures can make similar materials appear to have very different numerical color values. Establish method equivalence before comparing suppliers.
- Wavelength: record the analytical wavelength or absorption-maximum convention.
- Concentration: clarify actual sample concentration and any normalization.
- Path length: state the optical cell path length.
- Sample conditions: define solvent or buffer, pH, temperature and preparation time.
- Optical clarity: account for turbidity or scattering where relevant.
Carrier Systems and Supplied Formats
Commercial phycocyanin preparations may include carriers, buffering ingredients or other formulation aids. These can affect color strength per kilogram, handling, labeling and stability.
Request extract loading, carrier composition, moisture, particle size and dissolution instructions.
Confirm color strength, solids, pH, preservation, transport and storage requirements.
Review the exact composition and evidence for performance in the intended matrix and process.
A carrier-containing ingredient is not automatically adulterated. The issue is whether its composition is disclosed and consistent with the ordered specification.
COA and Technical-Dossier Checklist
Declared organism, extraction description and suitable identity evidence.
Numerical color-value result with method, wavelength and calculation convention.
Carriers, buffers, preservatives and other added ingredients; any claimed purity or content method.
Defined analyte coverage, method, reporting units and detection or quantification limits.
Individual elemental results, microbiology and additional risk-based source or process controls.
Matching batch number, specification revision, storage conditions and supported color-retention period.
Microcystins: Define the Test, Not Just “Free”
A source-control program should consider contamination by toxin-producing cyanobacteria. A high color value or a favorable purity index does not establish the absence of cyanotoxins.
Choose acceptance criteria appropriate to the destination market and use. Compare units carefully: µg/kg and µg/g differ by a factor of 1,000. “Not detected” means below the stated method limit, not absolute zero.
Heat, pH and Light: Qualify the Actual Process
Phycocyanin is a pigment-protein system. Heat, pH, light and the surrounding formulation can influence color retention and physical stability. Avoid assigning one universal stability window to every commercial preparation.
Beverages: test the final pH, heating and cooling sequence, holding time, package and storage exposure. Inspect color change, precipitation and turbidity.
Confectionery: evaluate the stage of addition, process temperature and final matrix. Performance in a cold frosting does not establish performance in a heated candy process.
Powder blends: qualify blend uniformity, moisture protection and color development after reconstitution.
Measurement: combine visual inspection with a defined colorimetric or spectroscopic procedure. Product changes can affect appearance without being captured by a single raw-material test.
Initial Color-Strength Adjustment
New ingredient amount = Reference amount × Reference color value ÷ New color value
For illustration, if two lots have comparable color values of 10 and 18 under the same validated procedure, an initial estimate for replacing 180 g of the first lot is 100 g of the second lot.
This is a screening calculation, not proof of an identical shade or performance. It assumes comparable methods, composition and an appropriate concentration-response range. Confirm the result in the finished matrix and within permitted use conditions.
What to Include in Your Phycocyanin RFQ
| RFQ Item | Requirement to Define |
|---|---|
| Identity and format | Source organism, extract type and powder or liquid presentation |
| Color strength | Grade code plus numerical criterion, units and test method |
| Composition | Extract loading, carriers, buffers and any other additives |
| Application conditions | Product pH, thermal process, target shade, package and storage conditions |
| Safety requirements | Microcystin test scope, elemental limits and microbiological criteria |
| Documentation | Lot COA, TDS, SDS, composition and applicable stability or use-support files |
| Destination market | Country, food category, intended coloring function and labeling review |
Regulatory and Labeling Review
Check the exact preparation and intended coloring use against current destination-market requirements. A spirulina-derived ingredient, an isolated pigment preparation and a formulated color system may need different classification assessments.
Frequently Asked Questions
Does E18 mean 18% phycocyanin?
Not automatically. E18 is a commercial grade description associated with a supplier's color-value convention. Request the actual method, numerical criterion and any separate content assay.
Is A620/A280 a percentage purity?
No. It is an absorbance ratio used as a spectroscopic purity index. It is not directly interchangeable with mass percentage or color strength.
Is blue spirulina extract the same as whole spirulina powder?
No. Whole biomass contains a broader mixture of constituents. Blue extract is a separated preparation with different color, flavor and formulation behavior.
Does a high color value establish toxin safety?
No. Color strength and safety are different questions. Review appropriate microcystin testing, source controls, elemental results and microbiology for the actual lot.
Can phycocyanin be used in every heated or acidic product?
Do not assume so. Qualify the specific preparation under the actual pH, heating, cooling, light exposure, packaging and storage conditions.
Discuss Your Phycocyanin Specification
Blueeyes Bio lists phycocyanin powder with E10 and E18 specification options. Send your application, target shade, processing conditions and destination market to request the current color-value method, composition and lot documentation.
Email: [email protected]
Quick Reference Summary
Phycocyanin qualification should distinguish commercial E-grade names, optical color value, absorbance purity index and quantitative content. Define the test conditions and complete composition before comparing suppliers. Microcystin and other safety controls remain separate from color testing. Finished-product pH, heat, light, packaging and storage trials are essential to establish suitability.
Selected Technical References
- Exploring the Benefits of Phycocyanin: extraction, properties and applications.
- Potential protein phycocyanin: properties, extraction and utilization.
- Example of commercial phycocyanin color-value specifications — Binmei.
- Blueeyes Bio phycocyanin portfolio.
Commercial methods and grade names are supplier-specific. This article provides technical sourcing information, not a market authorization or medical advice.
