Emulsions were prepared with lipophilic (Sorbitan
monooleate; HLB ¼ 4.3) and hydrophilic (Ceteth-10,
HLB ¼ 12.9) surfactants (both surfactants by Oxiteno) in
the range of 4.3 to 12.9 hydrophilic and lipophilic balance
(HLB) values, distilled water, and liquid paraffin oil (pharmaceutic and cosmetic grade). The chemicals were used as
received without further purification