Abstract
Curie-point pyrolyses of four paddy rice ( Oryza sativa L.) cultivars were carried out at 500 °C for 4 s. The products were analyzed by gas chromatography (GC) and/or GC/mass spectrometry. Analytical pyrolysis showed that rice lignin is a mixed p-hydroxyphenyl-guaiacyl-syringyl lignin, as did the results of alkaline nitrobenzene oxidation. The main pyrolysis products were 4-vinylphenol (VP) and 4-vinylguaiacol (VG). The determination of the vinyl compounds showed that the yield of VP had good correlation with the cultivars and the maturity of rice. p-Coumaric and ferulic acids in rice were determined on the basis of the yields of VP and VG produced on pyrolysis. The results were in good agreement with the amount of the acids determined by hot alkaline hydrolysis.
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