Physicochemical properties of No.1 - No.6 lacquer
berries were investigated from different origins. The Japan Showafuku (No.1) was the best cultivar of Rhus
succedaneum, the size of the berry of
it was near 3 - 4 folds, which was bigger than the Chinese cultivars (No.4 - No.6) of Rhus vernicifera et al. It had more than 5% ~ 10% of lacquer wax in
pericard, and contained less than 6% - 8% of lacquer oil in seed. No.1
had lower acid value (A.V) and iodine value (I.V); the key factors for this were
cultivar and its growing environment. The principal constituents of lacquer
waxes of No.1 - No.6 were triglycerides of fatty acids with total saturated
fatty acids (TSFA) of 75% - 82.7%, total unsaturated fatty acids (TUSFA) of 15.1% - 20%, and total dibasic acids (TDBA) of 5%. The CIEL a b system and Hunter
whiteness formula were used to evaluate the bleaching effect on lacquer wax by
physical adsorption and ultraviolet (UV) irradiation. The optimal conditions of
physical decoloration were determined for activated carbon: kieselguhr = 3:2 (g/g)
as adsorbent, a ratio of 1:20 (g/mL) for lacquer wax to petroleum ether, bleaching
30 min at 80?C. UV light achieved a good bleaching effect irradiated at 60?C
for 60 hrs. UV irradiation definitely changed relative contents of fatty acids,
TUSFA and TDBA decreased from 19.617% to 11.022% and 4.379% to 2.017% respectively,
while TSFA could be raised from 76.462% to 86.077%, however, the mechanism of
UV irradiation was still unclear and should be investigated in the future.
Cite this paper
Wang, C. , Dong, Y. , Cheng, H. , He, Y. , Ye, J. and Zhou, H. (2013) Physicochemical properties of lacquer berries and decolorization of lacquer wax by physical adsorption and UV irradiation. Advances in Biological Chemistry, 3, 329-337. doi: 10.4236/abc.2013.33037.
 Lu, R., Kanamori, D. and Miyakoshi, T. (2011) Characterization of thitsiol dimer structures from melanorrhoea usitata with laccase catalyst by NMR spectroscopy. International Journal of Polymer Analysis and Characterization, 16, 86-94. doi:10.1080/1023666X.2011.541030
 Jefferson, A. and Wangchareontrakul, S. (1986) Long chain phenols: Urushiol, laccol, thitsiol and phenylalkyl catechol compounds in Burmese lac from Melanorrhoea usitata. Journal of Chromatography, 367, 145-154.
 Dong, Y.H., Wang, C.Z. and Gong, K. (2009) Research progress on chemical constituents and comprehensive application of lacquer trees. Indian Journal of Science and Technology, 29, 225-232.
 Tsuji, S., Tonogai, Y., Ito, Y. and Harada, M. (1985) General analysis of various natural waxes in cosmetics. Journal of Society of Cosmetic Chemists of Japan, 192, 79-89. doi:10.5107/sccj.19.79
 Meguro, S. and Kawachi, S. (1989) Some physical properties of haze wax correlated with major fatty acids. Journal of the Japan Wood Research Society, 358, 754760
 Meguro, S. and Kawachi, S. (1990) Major fatty acid contents of haze wax. Changes during the growth and storage periods of haze seeds. The Japan Wood Research Society, 362, 133-138
 Wang, C.Z. and Wang, Q.F. (2000) Physical and chemical characteristics and chemical composition of urushi wax (oil). Chinese Wild Plant Resources, 19, 35-37
 Wang, Y.Q., Zhang, F.X. and Zhao H. (2003) Factors influencing colour of urushi wax. Chemistry and Industry of Forest Products, 23, 81-83
 Tachibana, S., Sakuragi, M. and Sumimoto, M. (1989) Chemical conversion of extractives for the production of chemicals and fuels. III. Sunlight bleaching of urushi wax. Nippon Mokuzai Gakkaishi, 35, 356-361
 Dal, K.Y., Hong, K.N., Dong, S.K. and Witoon, P. (2008) Decoloration of chitosan by UV irradiation. Carbohydrate Polymers, 73, 384-389.
 Meguro, S. and Kawachi, S. (1989) Some physical properties of haze wax correlated with major fatty acids. Journal of the Japan Wood Research Society, 35, 754-760.
 Meguro, S. and Kawachi, S (1990) Major fatty acid contents of haze wax. Changes during the growth and storage periods of haze seeds. Journal of the Japan Wood Research Society, 36, 133-138
 Xu, J. and Kawachi, S. (1989) Seasonal variations of some biochemical constituents in hazenoki, Rhus succedanea. Journal of the Japan Wood Research Society, 35, 30-35.
 Zhao, W.E. (2003) The antioxidant properties of carotenoids. Journal of Zhengzhou University. Natural Science Edition, 24, 38-46.