You can find protocols using PubMed, but searching PubMed is rather imperfect. To find protocols, try adding MeSH (Medical Subject Headings) to the keyword or phrase (such as "gluconeogenesis AND methods [sh]").
MeSH headings to try:
- methods [sh]
- analysis [sh]
- biosynthesis [sh]
- diagnostic use [sh]
- instrumentation [sh]
Video tutorial: