Figure 4. Thin layer chromatographic analysis of UV chromophore from Reticulitermes speratus. Spots on thin layer chromatographic plates were visualized by (A) spraying with a 13% sulfuric acid and 2% copper (II) sulfate solution followed by heating, and (B) fluorescence under UV light. Lane 1: methanol extract from workers and ergatoids of R. speratus collected in May. Lane 2: authentic norharmane. Note only one fluorescent spot (Rf = 0.68) in methanol extract from R. speratus.