Phenolic Profile and Antioxidant Activity of Crude Extracts from Microalgae and Cyanobacteria Strains

Table 3

Relative radical scavenging activity (RSA) of samples expressed as % inhibition ± standard deviation of three measurements and half-life (1/2) in seconds.

	Methanol; RSA (1/2)	Water; RSA (1/2)
Cyanobacteria
Nostoc commune	—	—
Nostoc sp.		—
Leptolyngbya protospira	7.65 ± 0.01	—
Nodularia spumigena	13.02 ± 0.02	—
Phormidiochaete sp.	14.59 ± 0.01	9.14 ± 0.02
Arthrospira platensis (AA)	—	—
Arthrospira platensis	—	—
Microalgae
Euglena cantabrica	100 ± 0 (<2)	100 ± 0 (<2)
Euglena cantabrica	100 ± 0 (2.1 ± 0)	100 ± 0 (2.1 ± 0)
Euglena cantabrica	71 ± 0.4 (4 ± 0)	48.9 ± 0.2
Caespitella pascheri	26.3 ± 0.2	—
Caespitella pascheri	—	—
Spirogyra sp.	61.56 ± 0.04 (202 ± 3)	43.37 ± 0.01
Ankistrodesmus sp.	29.43 ± 0.00	8.3 ± 0.0
Synthetic preservatives
BHA	91 ± 2 (130 ± 9)	NE
BHT	26 ± 2	NE

Samples prepared at 40 mg mL⁻¹.
Samples prepared at 10 mg mL⁻¹.
Samples prepared at 5 mg mL⁻¹.
Samples prepared at 1 mg mL⁻¹.
— means activity not detected.
NE: not evaluated.