Exploring Bagworm (Psychidae) as a Source of Bioactive Natural Products

Interest in natural products research has expanded beyond plants to include insects as potential reservoirs of bioactive secondary metabolites. While previous studies on bagworms have primarily focused on their ecology and biology, their chemical constituents remain largely unexplored. In this study, the bagworm and its protective case were investigated for their secondary metabolites. Extraction was carried out using cold methanol, followed by qualitative screening for secondary metabolites. Selective acid-base extraction and liquid-liquid partitioning were employed for isolation, while preparative thin-layer chromatography (PTLC) was used for purification. Spectroscopic characterization was carried out using Nuclear Magnetic Resonance (NMR) and Fourier Transform Infrared (FTIR) spectroscopy. Qualitative screening for secondary metabolites revealed the presence of alkaloids, flavonoids, tannins, triterpenoids, and steroids. The FTIR spectrum revealed absorption bands at 3373 cm⁻¹ (O–H stretch), 2925 cm⁻¹ (C–H stretch), and 1715 cm⁻¹ (C=O stretch), indicative of hydroxyl and carbonyl functional groups. The ¹H NMR spectrum showed signals between δ 0.8–2.0 ppm (aliphatic protons of a terpene skeleton) and δ 3.0–5.5 ppm (protons of a sugar moiety, including an anomeric proton at δ ~5.2 ppm). The ¹³C NMR spectrum displayed peaks at δ ~20–40 ppm (terpene carbons), δ 60–80 ppm (oxygenated carbons of sugar), and δ ~100 ppm (anomeric carbon), confirming the presence of a glycosylated terpene derivative (C₁₂H₁₈O₆) as the major isolated metabolite. Conclusively, this study reveals the bagworm as a potential source of novel bioactive secondary metabolites, underscoring the importance of insects in natural product discovery.

Secondary Metabolite, PTLC, NMR, FTIR, Glycosylated terpene, Bagworm.

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