Carotenoid-to-chlorophyll ratio as a proxy for assay of total fatty acids and arachidonic acid content in the green microalga Parietochloris incisa

A. E. Solovchenko, I. Khozin-Goldberg, Z. Cohen, M. N. Merzlyak

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

The relationships between pigment (carotenoid and chlorophyll) content with accumulation of total fatty acids (TFA) and arachidonic acid (AA) were studied in the green microalga Parietochloris incisa (Trebouxiophyceae, Chlorophyta) grown under different PFDs (35, 200, and 400 μmol photons m-2 s-1) and nitrogen availabilities. The growth of P. incisa under higher light and nitrogen deficiency was accompanied by accumulation of FA, an increase in carotenoid and a decline in chlorophyll content. It was found that the carotenoid-to-chlorophyll ratio (but not the individual pigment content) correlates closely with the volumetric content of both TFA and AA. Analysis of scattering-compensated absorption spectra of P. incisa suspensions revealed their tight relationship in the blue-green range of the spectrum with the carotenoid-to-chlorophyll ratio, TFA, and AA content. These findings allowed the development of algorithms for the non-destructive assay of TFA and AA in cell suspensions in the ranges of 0.09-3.04 and 0.04-1.7 μg mL-1, with accuracy of 0.06 and 0.01 μg mL-1, respectively, via analytically measured carotenoid-to-chlorophyll ratio and using the ratio of absorption coefficients at 510 and 678 nm, with accuracy of 0.07 and 0.02 μg mL -1, respectively. The feasibility of obtaining essential spectral information concerning the physiological condition of P. incisa using a standard spectrophotometer is also shown.

Original languageEnglish
Pages (from-to)361-366
Number of pages6
JournalJournal of Applied Phycology
Volume21
Issue number3
DOIs
StatePublished - 1 Jun 2009

Keywords

  • Absorption spectra
  • Fatty acids
  • Non-destructive assay
  • Photoadaptation
  • Scattering correction

ASJC Scopus subject areas

  • Aquatic Science
  • Plant Science

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