3D-Printed Gut Transit Drug Dissolution Project

ISEF Category: Translational Medical Science

Subcategory: Pre-Clinical Studies  ·  Difficulty: Intermediate  ·  Setup: School Lab  ·  Time: 1 to 2 Months

The Hook

A pill does not dissolve the same way in every stomach. Acid level, fluid mix, and flow all change how fast medicine moves into solution. You can model that with a low-cost chip and a phone camera. That turns a simple drug question into real pre-clinical research.

What Is It?

This project studies how fast common over-the-counter pain relievers dissolve in a small flow device that mimics parts of the digestive tract. Think of the chip like a tiny theme park ride for pills. The sample moves through channels that stand in for stomach and intestinal conditions, while your phone tracks color or pH changes that reflect how much drug has entered solution.

Dissolution kinetics means the speed of dissolving over time. That matters because a drug cannot work until the body can absorb it. Ibuprofen and naproxen have different chemistry, so they may behave differently when you change acidity, fluid flow, or the recipe of the simulated gastric fluid.

Why This Is a Good Topic

This is a strong science fair topic because you can change one factor at a time and measure a real response. You can test acidity, flow, or fluid composition, then compare how each one changes dissolution rate. The project links to drug delivery, stomach chemistry, and pre-clinical testing, which gives it real biomedical value. You can also build a clear story from simple materials, careful controls, and solid data analysis.

Research Questions

• How does simulated gastric fluid pH change the dissolution rate of ibuprofen in a microfluidic gut chip?
• How does simulated gastric fluid pH change the dissolution rate of naproxen in a microfluidic gut chip?
• What is the effect of flow rate on the amount of ibuprofen detected by a smartphone colorimeter over time?
• What is the effect of flow rate on the amount of naproxen detected by a smartphone colorimeter over time?
• To what extent does fluid recipe, such as added salts or mucus mimic, alter the dissolution profile of these two drugs?
• Which drug shows a larger change in dissolution rate when the chip switches from stomach-like to intestine-like conditions?

Basic Materials

• 3D-printed microfluidic-style chip or resin cast chip.
• Smartphone with a camera.
• Free colorimeter or image analysis app.
• pH strips or a handheld pH meter.
• Distilled water.
• Simulated gastric fluid ingredients approved by your school lab, such as dilute acid and salt solutions.
• Over-the-counter ibuprofen tablets.
• Over-the-counter naproxen tablets.
• Small beakers or collection cups.
• Digital kitchen scale with 0.1 g accuracy.
• Graduated cylinder or syringes.
• White background for photos.
• Notebook or spreadsheet for data logging.

Advanced Materials

• PDMS kit or resin printing materials for chip fabrication.
• Syringe pump or gravity-fed flow setup.
• Laboratory pH meter.
• UV-Vis spectrophotometer for cross-checking color readings.
• Analytical balance.
• Controlled-temperature water bath, if your protocol needs it.
• Laboratory glassware for preparing simulated fluids.
• Standard reference solutions for calibration.
• ImageJ calibration targets or color standards.
• Filtration supplies for sample cleanup if needed.

Software & Tools

• ImageJ: Measures color intensity in each reaction zone and compares standards.
• Python: Helps you fit dissolution curves and compare conditions with statistics.
• Google Sheets: Organizes measurements and makes quick plots of rate versus time.
• NIH ImageJ macro tools: Automates repeat image measurements across many photos.
• R: Lets you run deeper statistical tests and graph confidence intervals.

Experiment Steps

1. Define the drug, the chip region, and the readout you will measure first.
2. Choose one variable to change, such as pH, flow rate, or fluid recipe, and keep the others fixed.
3. Design a calibration plan that turns phone color values into a numeric signal tied to drug concentration or proxy signal.
4. Set up control conditions that separate real dissolution changes from lighting, channel clogging, and chip-to-chip variation.
5. Plan replicate runs so you can compare drugs and conditions with enough data for statistics.
6. Map out your analysis before testing, including how you will graph dissolution curves and compare slopes or half-times.

Common Pitfalls

• Using changing room light for photos, which makes phone color readings drift from run to run.
• Confusing pH change with drug amount, which can happen if your dye or indicator also shifts with acidity.
• Letting chip channels clog or trap bubbles, which changes the flow path and slows dissolution for the wrong reason.
• Comparing ibuprofen and naproxen without matching tablet size, surface area, or brand formulation, which can skew the result.
• Skipping replicates, which makes one odd trial look like a real pattern.

What Makes This Competitive

A stronger project does more than compare two drugs. It tests a clear mechanism, such as how acidity or flow changes dissolution, then backs that up with calibration, controls, and replicate data. You can raise the level by comparing your chip readout with a second measurement method, like UV-Vis or a lab pH meter. A sharp analysis plan, plus a question that connects fluid chemistry to drug behavior, makes the project feel much more like real pre-clinical research.

Project Variations

• Compare brand-name and generic versions of ibuprofen to see whether formulation changes the dissolution curve.
• Swap in a gelatin or mucus-mimic layer to test whether a more realistic gut lining changes drug release.
• Change the chip geometry, such as channel width or mixing region, to see how transport design alters readout strength.

Learn More

• PubMed: Search for review articles on drug dissolution, microfluidic drug testing, and oral drug delivery models.
• NIH PubMed Central: Read full-text biomedical papers on tablet dissolution and in vitro gut models.
• FDA Guidance Documents: Search for documents on oral dosage forms, dissolution testing, and bioequivalence methods.
• MIT OpenCourseWare: Look for free materials on transport phenomena, fluid flow, and biomedical engineering basics.
• The AAPS Journal: Search for peer-reviewed articles on dissolution testing and drug formulation behavior.