Common Methods for Detecting Sugar Content in Several Fruits
Fruits have become a necessity in our daily lives. Eating fruits regularly is beneficial for our health, and the colorful fruits always make us linger and enjoy it tirelessly. But the sugar content in fruits is also well-known to us. The question is how much sugar is actually present in fruits, which is something we are more concerned about and concerned about. Do we have any way to test the sugar content in them?
Firstly, it is necessary to analyze the composition of the fruit. As the name suggests, most or even 99% of the fruit should be water, so the solid content inside can be ignored. In the calculation process, the fruit should be treated as sugar water. And because the sugar in fruits mostly exists in the form of glucose and fructose, the sugar content and soluble solids can be equated, as the content of vitamins and minerals is extremely low.
I went to the local supermarket to purchase four types of fruits: apples, oranges, pears, and grapes. Belonging to the common and representative sugary fruits in the north. We used the existing instrument ATAGO desktop sugar meter in our laboratory to detect its sugar content.
Extraction of fruit juice
Extracting with a juicer is the most convenient. I use a small knife to cut a piece of fruit from the fruit, use a garlic press to press the juice, drop the juice into a small beaker, and then use a Pasteur straw to extract the juice supernatant for testing. The instrument used is Atago-5000a (Aituo) Abbe refractometer, which shall be zeroed and calibrated with clean water and standard solution provided by atago before testing.
Detection process
Drop the supernatant juice into the detector window of the Atago-5000a Abbe refractometer, and then cover the detector. The instrument has an automatic temperature control function. When the temperature reaches 20 degrees Celsius, press Start to read, and the number read can be approximately regarded as the sugar content of the fruit. The test results are shown in the table below:
Sugar content table for four types of fruits
Fruit sugar content
Apple 8.25%
Orange 14.06%
Pear 10.39%
Grapes 19.63%
empirical conclusion
From the above table, it can be seen that apples have lower sugar content, while grapes have the highest sugar content, which is also in line with our understanding of fruits. So diabetes patients should try to eat less juicy fruit. Apples and pears are relatively healthy fruits with low sugar content, making them suitable for consumption by the general public. In fact, there are a lot of Instrumental chemistry in life. As long as we are willing to live, the laboratory can be used for us.
