Home made carb drink

What makes up the carbs in sports powder carb drinks? If theses 48g of carbs in a drink of which 18g is sugar then where do the other 30g of carbs come from?

Might seem like a daft question but I’ve been making my own carb drink lately using pure sugar which for example I’ll use 50g of suger to achieve a 50g of carb concentration but why and how are shop bought products achieving the same carbs but only a fraction of the sugar?
Obviously using white sugar is not a good alternative to sports products.

The sugar conten is usually Fructose, the other carb content is Maltodextrin.

See this thread for more information SIS Beta Fuel

So basically making your own using pure sugar is a bad idea?

This is my solution.
Get it?

We made our own hydration drink to fight cramps ! – RideOttawa