How do I make liquid glucose from powdered glucose I recently decided to make something that required liquid glucose, 140g of it. No problem in general, but for some reason none of my usual suppliers had stock (even tried pharmacies). The closest I found was glucose powder.

Unfortunately, having no clue how to "re-hydrate" the powder to a liquid form, I experimented. :-)

I can safely say that 100g glucose powder was way to much as a substitute for 140g of liquid glucose (which I expected).

However, I was wondering if any of you had a convenient method of turning powdered glucose into the wonderfully thick and sticky liquid glucose, in case I ever find myself in that position.
Well, the answer is "it depends." This is pretty much the same as asking, "I have sugar, and I want sugar syrup. How much water do I add?" It depends on the concentration you're looking for. If you're looking for a 24% solution, it's 24 grams of glucose in 76 grams of water. A 30% solution is 30 grams of glucose in 70 grams of water, etc, etc.

Unless you have some chemical reason to avoid dextrin, you can just substitute corn syrup. The only reason they use glucose in Europe is because they don't have our superabundance of corn.