Publication

Thermostable phycocyanin from the red microalga Cyanidioschyzon merolae, a new natural blue food colorant

Rahman, D. Y., Sarian, F. D., van Wijk, A., Martinez-Garcia, M. & van der Maarel, M. J. E. C. Jun-2017 In : Journal of Applied Phycology. 29, 3, p. 1233-1239 7 p.

Research output: Scientific - peer-reviewArticle

The demand for natural food colorants is growing as consumers question the use of artificial colorants more and more. The phycobiliprotein C-phycocyanin of Arthospira platensis is used as a natural blue colorant in certain food products. The thermoacidophilic red microalga Cyanidioschyzon merolae might provide an alternative source of phycocyanin. Cyanidioschyzon merolae belongs to the order Cyanidiophyceae of the phylum Rhodophyta. Its natural habitat are sulfuric hot springs and geysers found near volcanic areas in, e.g., Yellowstone National Park in the USA and in Java, Indonesia. It grows optimally at a pH between 0.5 and 3.0 and at temperatures up to 56 A degrees C. The low pH at which C. merolae grows minimizes the risk of microbial contamination and could limit production loss. As C. merolae lacks a cell wall, phycocyanin with a high purity number of 9.9 could be extracted by an osmotic shock using a simple ultrapure water extraction followed by centrifugation. The denaturation midpoint at pH 5 was 83 A degrees C, being considerably higher than the A. platensis phycocyanin (65 A degrees C). The C. merolae phycocyanin was relatively stable at pH 4 and 5 up to 80 A degrees C. The high thermostability at slightly acidic pH makes the C. merolae phycocyanin an interesting alternative to A. platensis phycocyanin as a natural blue food colorant.

Original languageEnglish
Pages (from-to)1233-1239
Number of pages7
JournalJournal of Applied Phycology
Volume29
Issue number3
StatePublished - Jun-2017

    Keywords

  • Food colorant, Phycocyanin, Pigments, Red microalga, Cyanidioschyzonmerolae, ALGA GALDIERIA-SULPHURARIA, C-PHYCOCYANIN, SPIRULINA-PLATENSIS, CYANIDIUM-CALDARIUM, CRYSTAL-STRUCTURE, ENERGY-TRANSFER, PURIFICATION, STABILITY, SEPARATION

View graph of relations

Download statistics

No data available

ID: 47213732