Analisa Formalin pada Tahu Menggunakan Ekstrak Buah Naga (Hylocereus polyrhizus.)

Abstract

The research have done of formaldehyde analysis to tofu doing with dragon fruit extract. Analysis doing on three samples tofu from different location and based on qualitative methods. This method is done by using filter paper soaked in dragon fruit extract for 5 minutes. Then all the three tofu samples each placed on filter paper that has absorbed the color from dragon fruit extract and allowed to stand for 15 minutes. The result obtained by the two tofu is expressed negatively contain formaldehyde because of the color of the fruit dragon extract on filter paper absorbed and attached to the tofu (the color of tofu is purple) and one tofu obtained test positive containing formaldehyde because of the color from the fruit dragon extract on filter paper is not absorbed out and just stick but not attached on tofu (the color of tofu is white). It just the pure tofu are not containing that formaldehyde are suitable for consumption and the tofu are containing formaldehyde is not safe to consumption.