Methylation of Brazilein on Secang (Caesalpinia sappan Linn) Wood Extract for Maintain Color Stability to the Changes of pH

International Conference on Chemistry and Material Science 2017

化学;材料科学

Ulma, Zeni^1 ; Rahayuningsih, Edia^1 ; Wahyuningsih, Tutik Dwi^2

Department of Chemical Engineering, Faculty of Engineering, Universitas Gadjah Mada, Kampus UGM, JL. Grafika 2, Yogyakarta

55281, Indonesia^1

Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Kampus UGM, JL. Grafika 2, Yogyakarta 55281, Indonesia^2

关键词: brazilein;    Caesapinia sappan L;    Color stability;    Dimethyl carbonate;    Hydroxyl groups;    Methylation reaction;    Reflux condensers;    Stirring speed;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/299/1/012075/pdf
DOI  :  10.1088/1757-899X/299/1/012075

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The stability of natural dyes to the changes of pH is really necessary when the natural dyes are applied either on fabric or food. This research aimed to increase the stability of brazilein, a compound contained within the secang wood extract, to the changes of pH. The methylation process was done by reacting Dimethyl Carbonate (DMC) with the brazilein on the secang wood extract. DMC acts as a substance that substitute hydroxyl group on brazilein. The methylation reaction of brazilein on secang wood extract was operated on a three-necked round-bottomed flask fitted with mercury-sealed stirrer and reflux condenser under 80°C temperature and 250 rpm stirring speed. There were two variables observed in this research; the DMC amount ratio to the amount of secang wood extract and the time of the methylation process. The research showed that at the 1:10 the DMC amount ratio to the amount of wood extract and 8 hours of the methylation process give the better stability of color of the secang wood extract than the variation of the other variables.