Lu Rong, Honda Takayuki, Sung Meesook, Jung Jaekook, Miyakoshi Tetsuo
Department of Applied Chemistry, School of Science and Technology, Meiji University.
Department of Biochemistry, Institute for Clinical and Translational Research, College of Medicine, Catholic Kwandong University.
Anal Sci. 2017;33(11):1253-1257. doi: 10.2116/analsci.33.1253.
The chemical structure of fresh lacquer sap collected from a lacquer tree growing in Nago City of Okinawa, Japan, was analyzed by gas chromatography/mass-spectrometry (GC/MS) and nuclear magnetic resonance (NMR). The results showed that Nago lacquer is laccol lacquer and its major components are 3-(heptadeca-10Z,13E,15E-trienyl)catechol, 3-(heptadeca-10Z,13E-dienyl)catechol, 3-(heptadeca-14Z-enyl)catechol, and 3-(heptadeca-12Z-enyl)catechol, which are similar to the components of Vietnamese lacquer. It showed higher laccase activity at pH 5 - 8 and better low temperature adaptability than Vietnamese lacquer. The Nago lacquer reached a dust free dry (DF) condition after 6 h, but Vietnamese lacquer did not. However, both were able to achieve harden dry (HD) in 24 h at 25°C, 80% relative humidity. In order to identify the lacquer provenance, the strontium isotope ratio was analyzed. The strontium isotope ratio (Sr/Sr) of Nago lacquer was 0.7110, which is different from the 0.7450 of Vietnamese lacquer.
对从日本冲绳县名护市生长的漆树采集的新鲜漆液的化学结构进行了气相色谱/质谱联用（GC/MS）和核磁共振（NMR）分析。结果表明，名护漆是漆酚漆，其主要成分是3-（十七碳-10Z，13E，15E-三烯基）邻苯二酚、3-（十七碳-10Z，13E-二烯基）邻苯二酚、3-（十七碳-14Z-烯基）邻苯二酚和3-（十七碳-12Z-烯基）邻苯二酚，这些成分与越南漆的成分相似。它在pH 5 - 8时表现出较高的漆酶活性，并且比越南漆具有更好的低温适应性。名护漆在6小时后达到无尘干燥（DF）状态，但越南漆没有。然而，两者在25°C、80%相对湿度下均能在24小时内达到硬化干燥（HD）状态。为了鉴定漆的产地，分析了锶同位素比率。名护漆的锶同位素比率（Sr/Sr）为0.7110，与越南漆的0.7450不同。
