PENETAPAN KADAR KARBOHIDRAT SARI BUAH JAMBU BIJI (Psidium guajava L.) DENGAN METODE SPEKTROFOTOMETRI UV-VISIBEL

Novia, Miko Larasati (2019) PENETAPAN KADAR KARBOHIDRAT SARI BUAH JAMBU BIJI (Psidium guajava L.) DENGAN METODE SPEKTROFOTOMETRI UV-VISIBEL. Diploma thesis, Sekolah Tinggi Ilmu Kesehatan Nasional.

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Abstract

Guava fruit (Psidium guajava L.) is one of the fruits that contain lowcalorie carbohydrates, so it is useful as an energy source and can be used to control blood glucose by regulating a low-carbohydrate diet. The purpose of this study was to determine the levels of carbohydrates in guava fruit juice. Guava fruit that has been washed and then drained, then smoothed using a juicer. The extract obtained was added CaCO3, Pb acetate and Na-oxalate. The preparation results were used for qualitative analysis with molisch test, fehling test, and luff test and quantitative test analysis by UV-visible spectrophotometry at a maximum wavelength of 629,1 nm with the addition of 0,1% anthrone reagent. Qualitative analysis shows that guava juice contains carbohydrates. The results of the quantitative analysis showed that the average carbohydrate content of guava juice was 2,83 g / 100 ml b / v with the acquisition of % KV of 0,67%.

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