I had a hunt on the internet and found these bits of info...
Dextrose Monohydrate is a white crystalline powdered sugar obtained from the complete hydrolysis of corn/maize starch. http://www.afis.com.au/products/food-ingredients/dextrose-monohydrate-8-0040/
In its pure form, it has a dextrose equivalency (DE) of 100, which indicates that it's 100% pure Dextrose, not a mixture with other substances as well. http://www.cooperativepurchasers.com/Ingredients/Dextrose/What-Is-Dextrose-Monohydrate.html
Dextrose is apparently another name for glucose. http://en.wikipedia.org/wiki/Glucose
A scientific study was done that reported ... Adult bees can utilize glucose, fructose, sucrose, trehalose, maltose, and melezitose, but bees are unable to digest rhaminose, xylose, arabinose, galactose, mannose, lactose, raffinose, melibiose or stachyose. 'Honey Bee Nutrition' (Jointly published in the American Bee Journal and in Bee Culture, August 2010, Zachary Huang, Michigan State University). I cannot find the original report, but the cached version is at http://webcache.googleusercontent.com/search?q=cache:79JeWQkvOcMJ:www.beeccdcap.uga.edu/documents/CAPArticle10.html+bees+digest+sugar&cd=7&hl=en&ct=clnk&gl=au
I cannot claim any personal knowledge or experience with feeding Dextrose Monohydrate to bees, but I thought you might like to read what I found on the web.