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Chromatogram of phenolic acids soluble in methanol: a) synthetic standards, b) Spirulina sp., c) Nannochloropsis sp. 1=gallic, 2=protocatechuic, 3=chlorogenic, 4=4-hydroxybenzoic, 5=caffeic, 6=syringic, 7=vanillin, 8=4-coumaric and 9=ferulic acids
