Inhibitory effects of Azadirachta indica secondary metabolites formulated cosmetics on some infectious pathogens and oxidative stress radicals

Table 7 Physicochemical of properties of neem oil and essential oil

Physicochemical Properties	Neem oil^a	Leaf EO^b	Stem-bark EO
Physical state	viscous liquid	light viscous liquid	light viscous liquid
Colour	brownish	light yellow	colourless
Odour	garlic repulsive	repulsive	repulsive
Relative density	0.921 ± 0.014	0.904 ± 0.113	0.902 ± 0.103
Acid value (1 mg of KOH/g of oil)	15.840 ± 0.0021	17.191 ± 0.004	19.630 ± 0.001
Ester index	172.201 ± 0.012	74.930 ± 4.311	53. 150 ± 1.866
Refractive index at 38 °C	1.4667 ± 0.011	1.4383 ± 0.031	1.4372 ± 0.201
Saponification value	187.620 ± 0.031	109.312 ± 0.021	72.780 ± 0.011
Iodine value (%) (g of I2/100 g of oil)	77.470 ± 0.011	ND	ND

^aoil extracted from the neem seed by mechanical press
^bessential oil extracted from the leaves and stem-bark by hydrodistillation, ND = not determined