Enteric coating lab
Fri, Dec 11, 2026 · Week 16 · Principles of Biomedical Technology (Principles of Biomedical Science)
Today's goal: Coat and test artificial pills, recording observations at fixed thirty-second intervals through both simulated environments.
This is a model of the work you should turn in today. Use it to check your own: match the structure and the level of detail, do not copy it. Your data and wording should be your own.
Setup recorded before I started: goggles on, bench clear, waste container open, timer at zero, both fluids at the stated temperature.
Variables:
- Independent variable: which fluid the pill was sitting in (simulated stomach, then simulated intestinal).
- Dependent variable: the condition of the coating at each 30-second check.
- Controlled variables: same pill, same number of coating dips, same fluid volume (50 mL), same temperature, same observer for the whole run.
Stomach phase, 0:00 to 4:00:
- 0:30 coating smooth, no color change, no bubbles.
- 1:00 surface slightly cloudy, still sealed.
- 1:30 cloudy, no cracks.
- 2:00 no change from 1:30.
- 2:30 one faint line along the top edge, coating still holding.
- 3:00 same faint line, nothing lifting.
- 3:30 no change.
- 4:00 coating intact. Pill moved to the intestinal fluid at 4:00.
Intestinal phase, 4:00 onward, timer left running:
- 4:30 edges softening.
- 5:00 first small piece lifts off the coverslip.
- 5:30 about a third of the surface has lifted.
- 6:00 most of the coating is off, one thin patch still attached.
- 6:30 fully separated. Recorded 6:30 as the separation time for this practice run.
What the practice run taught me about how the coating fails: it did not split open all at once. It softened first, then lifted in pieces, so the moment I call 'separated' depends on the definition I use.
Limitation of judging separation by eye: 'fully separated' is a judgement, not a reading off an instrument. My 6:30 could be someone else's 6:00. That is why the operational definition has to be written down before Part II, and why one person should score a whole run.
One more note to myself: I nearly skipped the 2:00 check because nothing was happening. A blank row there would have been unusable, because a reader cannot tell a coating that held from an observer who looked away. 'No change' is data.
| Time | Phase | Observation |
|---|---|---|
| 0:30 | Simulated stomach | Coating smooth and sealed |
| 2:00 | Simulated stomach | Cloudy surface, no cracks |
| 4:00 | Simulated stomach | Intact, pill transferred |
| 5:00 | Simulated intestinal | First piece lifts away |
| 6:30 | Simulated intestinal | Coating fully separated |
This model shows the level of evidence and organization needed to complete: Completes the Part I practice run: an unbroken 30-second observation record through the simulated stomach phase and the simulated intestinal phase, with the variables labeled and one stated limitation of judging separation by eye.
- Name the variables and include units.
- Enter observations without changing the raw values.
- Check labels, calculations, and patterns before interpreting the data.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
Also due today: Submit your data table on the class site, or hand it to Mr. Mendoza in class before leaving.
Claim ceiling: Today's evidence supports a classroom claim about enteric coating lab. It cannot prove causation, diagnose a real patient, or justify action outside this room.
One exam-style question that uses exactly what you practiced today. Try it before you reveal the answer, then read why each choice is right or wrong.
Tap an answer to see the full explanation. Nothing is recorded or graded.
It builds this reusable test skill: Keeping an unbroken timed observation record while a procedure runs.
- Name the concept or data pattern being tested.
- Cross out choices that violate that rule or the evidence.
- Justify the best remaining choice before checking the answer.