The study looked at the sugar content in different types of Korean apples. They found that Fuji apples had the highest sugar content, while Tsugaru apples had the lowest. The main sugars found in the apples were fructose, glucose, and sucrose. The ratio of these sugars varied between the different types of apples. Overall, the study showed that the sugar composition in Korean apple cultivars differs, with some types having more fructose and others having more glucose.