PENENTUAN NILAI SUN PROTECTION FACTOR (SPF) EKSTRAK ETANOL RIMPANG BANGLE (Zingiber purpureum Rovb.) SECARA SPEKTROFOTOMETRI UV-Vis

Research has been conducted on the determination of the value of Sun Protection Factor (SPF) extract of rhizome bangle (Zingiber purpureum Roxb.) in spectrophotometer UV-Vis As an active ingredient of sunscreen. This study aims to determine the SPF value using the UV-Vis spectrophotometry method. Rhizome bangle extracted by maceration method using 96% ethanol solvent, then made in a concentration of sample solution 10 ppm, 20 ppm, 30 ppm 40 ppm and 50 ppm. The solution was then measured for absorbance in a UV-Vis spectrophotometer with a wavelength of 290-320 and an interval of 5 nm. Calculation of SPF values using the Petro method, and the results of the study showed that rhizome bangle extract had activity as a dark veil with a minimum level of protection sun protection at a concentration of 20 ppm with a value of SPF 3,60003. A concentration of 30 ppm shows extra protection with an SPF value of 6.30566. The concentration of 40 ppm showed maximum protection with a value of SPF 9,38396 and a concentration of 50 ppm indicating ultra-protil with a value of SPF 28,10936. Based on the results of these tests also obtained a linear relationship between concentration and SPF value.