Abstract:
Formaldehyde is widely used as a food additive to preserve food, one of which is tofu,
because tofu has a high-water content which makes tofu rot quickly and taste sour. The
use of formaldehyde as a preservative is strictly prohibited in accordance with the
Republic of Indonesia Minister of Health Regulation No. 033 of 2012 because
formaldehyde is dangerous for body health. One innovative technology that can be used
to detect the presence of formaldehyde in tofu in a simple and practical way is system
design Electronic Nose (E-Nose). The objective of in this research is tofu soaked with
varying formaldehyde concentrations of 0%, 1%, 2%, 3%, 4% and 5% will be detected
using a system E-Nose which is designed to use 3 gas sensors made from
semiconductors, including the TGS2600, TGS2602, and TGS2611 gas sensors. The
gas sensors used will produce a response in the form of an output voltage. From the
voltage response produced by each sensor, if the greater the formaldehyde
concentration is detected, the resulting voltage response will also increase.
