ANALISA ZAT WARNA MERAH PADA EKSTRAK KAYU SECANG (Caesalpinia sappan L) MENGGUNAKAN SPEKTROFOTOMETER VISIBLE (Analysis Subtance Red Colour of Secang Wood (Caesalpinia sappan L.) Extract with Spectrophotometer Visible)

Abstract

Secang wood (Caesalpinia sappan L.) is one of the plants that have high antioxidant content in the wood. Most influence antioxidant content is brazilin. Brazilin is the natural pigment that gives the red color pigment classified as flavonoids and are generally soluble in water so widely used for traditional drink and potential as a natural dye. The purpose of this study are: (1) to determine the analysis substance colour to the influence of the type of solvent extracts secang wood, (2) to determine the effect of heating with variations in temperature and pH stability of the color of the solvent to extract secang wood. This research was conducted by extracting samples with aquadest and 95% ethanol with a ratio of (1:13); (1:15); (1:17) and (1:19) w/v with T = 40oC, 50oC, 60oC and 70oC (aquadest only) and pH 2,3,4 and 5. The extract obtained is used to test the stability of the colour using spectrophotometer visible. Results from this study showed that 95% ethanol with the ratio of 1:13 (w/v) is the best solvent to extract the rosella flower petals by absorbance at 1.574 at pH 2. While the distilled water extraction conditions is best done on a heating temperature of 40 ° C with pH 2 and ratio of 1:13 (w / v). Besides the influence of temperature and pH showed that the higher the heating temperature and the higher the pH value, the concentration of the extract wana secang wood lower. Keywords : brazilin, secang wood, spectrophotometer visible