Happy New Year to you, too!
Thanks for providing the additional information. It is interesting that you want to relate the amount of sugar in the rice to its effect on people with diabetes. I think that glycemic index is a much more accurate way to measure this, as different carbohydrates (and other foods) can still increase blood glucose. Check out this information from the American Diabetes Association: http://www.diabetes.org/diabetes-basics/diabetes-myths/
, http://www.diabetes.org/food-and-fitnes ... -counting/
Your measurement will only be detecting glucose. If you are interested in the total amount of carbohydrates in your rice, you might try using a different test. Here is some information for testing total carbohydrates in food: http://people.umass.edu/~mcclemen/581Carbohydrates.html
. This is a much more complicated analysis, so you may not want to go that route. But you do need to understand that it is not just glucose itself that causes blood glucose to rise after eating. I do think that glycemic index is the best way to directly test what you are interested in.
Here is the Wikipedia article regarding the glycemic index: http://en.wikipedia.org/wiki/Glycemic_index
. Although Wikipedia is not considered a reliable resource, it's a good starting place and the bibliography usually has a lot of great resources.
I hope I have not discouraged you. Your project idea is still interesting in its own right. You could test the glucose content of the different kinds of rice, and still talk about how that relates to the total amount of carbohydrate in each type. The American Diabetes Association points to the total carbohydrate as a risk factor, over any other measure. But it is interesting that brown rice contains more sugar, whereas the other kinds of rice have more starch.
If you wanted to change your project a bit, you might consider testing the glucose content of different types of food with different (known) glycemic indices. Then you could see whether glucose content and glycemic index are related, and how.
Please post again if you have more questions!