Figure 13: Effect of fisetin and MCN-fisetin on production of ascorbic acid in lung tissue. The sample was incubated with distilled water, DNPH and thiourea, after which, the crystals formed were dissolved in 80% sulphuric acid. Absorbance was read at 540 nm in a spectrophotometer (Shimadzu). Concentration of ASA was determined from a standard curve. (*P<0.05 versus Control; *P<0.05 versus Ova).