Long-chain phenols

Characterization of catechol‐containing natural thermosetting polymer “urushiol” thin film

“…The main component in urushi, called urushiol, is a catechol derivative with a long unsaturated hydrocarbon side chain (Fig. ) . Raw urushi is a mixture of 60–65% urushiol and 20–25% water, with the remaining 15% consisting of other compounds such as water‐soluble plant gums, polysaccharides, and a small amount of laccase and other enzymes .…”

“…1). [1][2][3] Raw urushi is a mixture of 60-65% urushiol and 20-25% water, with the remaining 15% consisting of other compounds such as water-soluble plant gums, polysaccharides, and a small amount of laccase and other enzymes. [4][5][6] Using laccase as the catalyst for oxidative polymerization, urushi is cured at room temperature in a high-humidity environment.…”

Oriental Lacquer III. Composition of the Urushiol Fraction of the Sap of Rhus verniciflua

“…19 • 21 It has been claimed, and probably properly so, that the quality of the raw urushi suitable for its use as lacquer depended mainly on the amount of the urushiol triene component and the amount and the activity of the oxidation enzyme laccase. 16 The catechol component of urushiol has a linear hydrocarbon side chain in the 3-position of the benzene ring. The double bonds of the unsaturated portion of the molecule are separated from the benzene ring of the catechol by 7 methylene groups.…”

Characterization of Japanese lacquer liquid and films by means of evolved gas analysis-ion attachment mass spectrometry

“…Therefore, analytical methods for the chemical characterization of lacquers are important, especially for studies of the conservation and restoration of lacquered objects. 2,3 Lacquers have been chemically analyzed by means of various techniques including chromatography/mass spectrometry (GC/MS), 4 solid-state 13 C nuclear magnetic resonance spectroscopy, 5 Fourier transform infrared spectroscopy, 6 and X-ray photoelectron spectroscopy. 7 However, of these conventional methods, only mass spectrometry provides information about the chemical components of lacquers.…”