Abstract:
The characteristic of Isaria tenuipes grown on the solid-state medium demonstrated a white and spongy colony. The morphology of fruiting bodies showed the yellow, tapering rod, disorderly branch shape, and white spore on top. The highest mycelium growth rate in a liquid medium for inoculum in 96 hours was 18.20 g /L based on dry weight and the fruiting body was 1.63 g /substrate based on dry weight. The major compounds found in the fruiting body extract were cordycepin, adenosine, and polysaccharides with the amount of 1.06, 9.61, and 29.32 mg/g based on dry weight, respectively. Additionally, the extract demonstrated an antioxidant activity investigated by DPPH and ABTS assays with the IC 50 values of 0.66 and 0.35 mg/mL, respectively. The extract had the SOD content equal to 9.17 units/mg protein. The stabilities of polysaccharides and adenosine in the solution of isaria tenuipes extract were stable than cordycepin after storage at 4 and 30 °C for 12 Weeks. The polysaccharides and adenosine contents were reduced by less than 10%. A skin serum was formulated with 1.8, 1.9, and 2.0 % of Isaria tenuipes extract. Although the cordycepin or polysaccharides contents were not significantly different among the formulations, the cordycepin contents showed the highest amount in the formulation of 2% of the extract. Therefore, for further study, a skin serum was formulated with 2% of Isaria tenuipes extract. The chemical stabilities of skin serum formulations demonstrated that the polysaccharides, cordycepin, and adenosine contents in a skin serum were decreased greater than 10 % after storage at 4 and 30 °C for 12 Weeks. However, the physical stabilities of skin serum formulations showed no significant differences in pH, viscosity, and color among the formulations after storage at 4, 25, and 30 °C 12 Weeks. The Microbiology, which passed the safety of cosmetic products acceptance criteria. A sensory evaluation questionnaire showed that the overall of a skin serum of Isaria tenuipes extract were more significant preference than those of a commercial product.