Assessment of Antioxidant Activity of Spray Dried Extracts of Psidium guajava Leaves by DPPH and Chemiluminescence Inhibition in Human Neutrophils

Table 3

Physicochemical characterization of the extractive solution (ES) and of concentrated extract (CE) of P. guajava.

Samples	𝐶𝑠 (%)	𝜌 (g/cm^3)	pH (—)	Alcoholic grade (°GL)	TF (mg/m db)	TP (% m/m db)	TT (% m/m db)	DPPH^•1 (µg/mL)
SE	3.27 (0.03)	0.89 (0.00)	5.94 (0.02)	70	23.55 (0.01)	26.29 (0.03)	11.31 (0.02)	3.94 (0.10)
CE	10.7 (0.12)	0.93 (0.00)	4.90 (0.07)	0	22.52 (0.01)	23.17 (0.07)	12.61 (0.10)	3.34 (0.11)

𝐶_𝑠: concentration of solids; 𝜌: density; TF: total flavonoids; TP: total polyphenols; TT: total tannins; db: dry base; 1antioxidant activity by the DPPH^• method, expressed as IC₅₀. Values are presented as the mean (standard deviation).