how do you get sour sugar like in tangfastics?

Question: how do you get sour sugar like in tangfastics?
- Keywords:
  sense,
  sugar,
  sweet
Asked by to Daren on 18 Jun 2014. This question was also asked by .
- Daren Fearon answered on 18 Jun 2014:
  
  The sour taste we experience is from our taste buds detecting high levels of acidity not actually sugar which is responsible for the sweet taste in tangfastics.

Question: how do you get sour sugar like in tangfastics?