<b>Physicochemical attributes of oils from seeds of different plants in Nigeria</b>

Abstract

The physicochemical qualities of oils from seeds of seven plants grown in Nigeria were evaluated. Physical characterization of the oils includes viscosity, state at room temperature, colour, specific gravity and refractive index. The results showed that they have different colors and are consistently liquid at room temperature. The viscosity of the oils varied; P. macrophylla had the highest viscosity of 19.55 cST while D. edulis had the least value of 11.00 cST. The specific gravity of all the oils ranged between D. edulis (0.84) and P. macrophylla (0.92). The oils were further characterized by the determination of the acid, iodine, saponification, ester and peroxide values. The molecular mean masses of the oils were also determined. Apart from C. inophyllum, the acid value of the oils (2.79-5.19 mg NaOH/g oil) suggests that they are nutritionally viable as oil sources. The iodine values of the oils (31.50-85.00 mg iodine/100 g) placed them in the non-drying class. The saponification values of all the seven oils (161.29-244.97 mg KOH/g oil) suggest their usefulness in the industry as shaving cream.

Physicochemical composition of Tamarindus indica L. (Tamarind) in the agro‐ecological zones of Uganda

“…The values of the present study are higher than those documented for Lannea kerstingii (Ouilly et al., ) and Allanblackia floribunda (Wilfred, Adubofuor, & Oldham, ). However, our documented values are within the range reported by Taha, Nour, and Elkhalifa () but lower than those values reported in other studies such as Ajayi () and El‐Siddig et al. ().…”

“…Peroxide value indicates the degree of oxidation of the oil—low peroxide value indicates low oxidation (Ekop et al., ). The present study values are above the values reported for most common plants (Ajayi, ; Ekop et al., ; Muhammad et al., ; Ouilly et al., ; Wilfred et al., ). This value is above the range of peroxide values (<10 mEq/kg) generally reported for fresh fats and oils (Kirk & Sawyer, ).…”

“…The present study values are above the values reported for most common plants (Ajayi, 2010;Ekop et al, 2007;Muhammad et al, 2013;Ouilly et al, 2017;Wilfred et al, 2010). This value is above the range of peroxide values (<10 mEq/kg) generally reported for fresh fats and oils (Kirk & Sawyer, 1991 This is of no nutritional interest to humans, suggesting that they could not be utilized as edible oils which allows it not to be consumed as virgin edible oil.…”

“…Whereas there is information on the physicochemical properties of many neglected indigenous tree species (Abiodun, Dauda, Adebisi, & Alonge, 2017;Ajayi, 2010;Hiremath, Yadav, & Suguna, 2016;Ouilly et al, 2017;Sulieman et al, 2015), many studies focused on the edible parts (pod pulp and leaves). Little attention was given to non-edible parts such as seeds.…”

Synthesis of Azidohydrin from Hura crepitans Seed Oil: A Renewable Resource for Oleochemical Industry and Sustainable Development

“…The iodine value sorts the oil in the range of cotton seed oil or corn oil ( Gossypium hirsutum and Zea mays , resp.) [27, 28] while the saponification value is somewhat higher, like Tamanu oil ( Calophyllum inophyllum ) [29]. Saponification values exceeding 200 are quite rare cases, which may be important for specific industrial applications.…”