Now that's odd
I sent a PM to you yesterday or so I thought. Hmm I wonder what happened. Oh well, anyhoo, sorry to disagree with SC but the fact of the matter is
you can't caramelize Isomalt chemically it just doesn't work that way. Isomalt is a Polyol (a sugar alcohol) while it shares a commonality with sucrose in it's texture and appearance and it is based on sucrose, that's where the similarity ends. It will not cook the same, taste the same or digest the same as regular sugar. Anytime you have a candy or item made with Isomalt that is caramelized, it was done with flavorings. So don't waste your time trying to brown it, t'aint gonna happen.