It does not seem likely that our sugar type reducers (Glucose, Fructose, Maltose, Karo, etc.) would themselves be reduced in the process of changing IS to colloidal silver. I would think that whichever glucose molecules did the actual reducing of Ag2O to Ag particles would be loosing an electron, not gaining.
Of course, since we typically put in way more than the bare minimum amount of reducer then it would be possible for a number of different reactions to be happening at the same time. Possibly some glucose would be REDUCED to Sorbitol as Peter suggests since in most cases there is still some H2 present after electrolysis.
One thing I have noticed is that if I use just the bare minimum amount of Maltose (32 mg/L of 20 PPM) then I get very little reduction at all at room temp. (stays clear with a hint of PINK tint ! ) If I want to use Maltose to reduce @ about room temp (25*C = 77*F) then I have to use at least 4 or 5 times the stoichiometric amount of Malt. If I use even more like 7 times the stoich amount (0.23 gm/L for 20PPM) then I get the very least amount of turbidity of all the different reducers I have tried. I know I could get by with far less Maltose if I were to warm the IS before reducing, but then I would also get a little more turbidity. I am not talking about the type of turbidity that can be seen in normal lighting conditions or in sunlight. I am talking about the amount that can be seen in the beam of a strong focused beam flashlight in low ambient lighting conditions. (in other words, splitting hairs)
Other things I have noticed: As long as I used a sufficient amount of electrolyte to do the electrolysis then all the sugar type reducers turn out looking very similar to each other in normal lighting conditions. (Color & clarity) However if you scrutinize them all with a focused beam flashlight then they all look very different from one another. The color that is reflected by the beam is different with each.
Some reflect different shades of blue in the beam and some reflect white or grey in the beam. I wonder if different reducers have different "side reactions" taking place at the same time?
Also wonder if the end products of those side reactions would account for the very different colors in the beams?
The various sugar type reducers I have tried are: Karo, Pure Dextrose Powder (Glucose), Pure Fructose Powder, Lab Grade Maltose Monohydrate. I suppose the "Monohydrate" may be the reason I need quite a bit more malt than the stoich amount you guys figured out. It may have sucked some water from the air by now too. At 25*C (77*F) the Dextrose Powder & the Fructose Powder reduce the IS to colloidal silver in seconds. The Karo reduces in about 10 minutes & The Maltose reduces in a few hours. Any time I am comparing these sugar type reducers I make a big batch of IS and split it into sub-batches to minimize other variables.