1. Check the initial sugar level in the sweet beverage of your choice.

• Use a glucose dipstick to measure sugar in the beverage.

• Take a photo of the glucose dipstick or record the colour and value.

  
  

2. Set up the experiment

• Mix 1 tsp of yeast with 10 ml of beverage and 40 ml of water

• Put the mixture in a small bottle and seal it tightly, wait 3 days

• Repeat Step 1 and record the sugar level again.

A glucose dipstick is a special strip that helps us detect if sugar is present in a mixture. When you dip the strip into a liquid containing sugar, it changes color! By comparing the strip's color to a standard color chart, we can estimate how much sugar is in the mixture. These quick and simple tests are used by doctors to check blood sugar levels and by scientists to test food products.

b) How much sugar can a glucose dipstick measure?

The strip can measure sugar amounts from 0% (no sugar) up to 2% sugar. If there is more than 2% sugar, the strip will not be able to tell us exactly how much. We need to dilute the mixture first.

[For example, mix 10mL of mixture with 40mL water to dilute 5 times.]

c) Finding actual sugar amount in diluted drinks:

Since we diluted 5 times, multiply chart reading by 5:

• If chart shows 0.5% → 0.5 × 5 = 2.5% sugar

• If chart shows 1% → 1 × 5 = 5% sugar

Procedure:

• Pour 10 ml of Ice Lemon Tea into a beaker.

• Pour 10 ml of Reduced sugar Ice Lemon Tea into another beaker. Label the beakers.

• Dip a sugar test strip quickly into both beakers at the same time. Start the stopwatch.

• After 30 seconds, observe the colour of both test strips and compare with the colour chart.

• Record the % of sugar.

Experiment 2 (Class Demonstration)

As part of the class demonstration, each drink sample was first diluted by mixing 10 mL of the drink with 40 mL of water. These diluted samples were then tested using glucose dipsticks. The colour on the glucose dipsticks were compared with the colour chart to determine the sugar content.