fig4
Figure 4. FT-IR spectrum of the volatile matter from (A and D) intermediates G15, (B and E) G30, and (C and F) G35 under air atmosphere; (G and H) TG/DTG curves of intermediates G15, G30, G35 and glucose; (I) TG/DTG curves of intermediate G0. FT-IR: Fourier transform infrared spectroscopy; TG/DTG: thermogravimetric/differential thermogravimetric.