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Table 7 Physicochemical of properties of neem oil and essential oil

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

Physicochemical Properties Neem oila Leaf EOb 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
  1. aoil extracted from the neem seed by mechanical press
  2. bessential oil extracted from the leaves and stem-bark by hydrodistillation, ND = not determined