I bought a digital scale (0,1 gr accuracy) and then measure how many grams I need. I then transfer the quantity to a spoon and see how much it is...
meaning, I measure all my food once (the first time only) and then write down how does that translates to spoons or cups...
to answer your question: Spoons... 1 spoon is about 11 grs.
BY the way, Dextrose is much heavier than maltodextrine... I would recommend everybody to buy a cheap digital scale so you can remove the guessing. Makes life much easier (mine was like 20 bucks)
peace