The percent tyrosinase inhibition of kojic acid increases as the concentration of kojic acid. But the value %inhibition in concentration 0.1 and 0.2 error , probably due to preparation of extract solution, the time it takes to prepare the extract solution and the amount of chemicals that put in unequal.
The percent tyrosinase inhibition of rambutan peel extract and polysaccharide extract are error because contamination of the extract, preparation of extract solution, and the time it takes to prepare the extract solution and the amount of chemicals that put in unequal.
When the extract both 3 to comparison. The kojic acid has the highest %tyrosinase inhibition. The second is polysaccharide extract and rambutan peel extract respectively. Kojic acid it’s a good antioxidant, therefor it can inhibit tyrosinase enzyme. Kojic acid is cause effective for brightening an uneven skin tone.