Fluidic Manipulation of a Paper Origami for Oil Quality Testing

This project looks at creating and testing a tiny, fold‑up paper device that can quickly and cheaply check the quality of edible oils. The device uses specially shaped “fin‑like” paper pieces to move fluids precisely, so it can deliver exact volumes of liquids and place chemical reagents on the paper without any pumps. Small passive valves built into the fin arms control the flow, allowing several color‑changing tests to run at once. To see how well the multiplexed origami device works, we also built a simpler, single‑channel vertical paper device. This version performs peroxide‑value titrations on different oil samples. By changing how much titrant is placed on the paper, a

brown color gradient appears that matches the peroxide level in the oil. The paper‑based microfluidic method provides a practical, low‑cost, and easy‑to‑use alternative to standard lab titrations. It is well suited for on‑site food‑quality checks and field screening in the agro‑food sector. Our work includes making the paper channels, preparing the reagents, and setting up a reliable color‑based calibration scale for measuring peroxide content.

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