Novita Hasibuan
Bachelor of Pharmacy Study Program, Dirgahayu Samarinda Institute of Health Sciences, Samarinda, East Kalimantan, 75122, Indonesia

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Application of Deep Eutectic Solvents to Kleinhovia hospita L.: Total Flavonoid Content and Anti-cholesterol Activity Novita Hasibuan; Nurillahi Febria Leswana; Muh Taufiqurrahman
Farmasains : Jurnal Ilmiah Ilmu Kefarmasian Vol. 13 No. 2 (2026)
Publisher : Universitas Muhammadiyah Prof. DR. HAMKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22236/farmasains.v13i2.24669

Abstract

Hypercholesterolaemia is a major risk factor for cardiovascular disease. Tahongai (Kleinhovia hospita L.) leaves contain flavonoids with potential cholesterol-lowering activity. This study aimed to determine the total flavonoid content, evaluate the anti-cholesterol activity, and analyse the relationship between both parameters in Kleinhovia hospita L. leaves extracts obtained by Ultrasound-Assisted Extraction (UAE) using Deep Eutectic Solvents (DES) composed of propylene glycol and lactic acid. This experimental study employed DES propylene glycol-lactic acid at three molar ratios (1:1, 1:2, and 2:1). Total flavonoid content was determined using the aluminium chloride colourimetric method with UV–Visible spectrophotometry, while anti-cholesterol activity was evaluated in vitro using the Liebermann–Burchard method, with simvastatin as the positive control. The highest total flavonoid content was found in the DES propylene glycol-lactic acid molar ratio of 2:1, with a value of 679.99 mg QE/g. At 25 µg/mL, the highest cholesterol inhibition was observed at a molar ratio of 2:1  (45.73%), whereas simvastatin showed 89.47% inhibition. Pearson analysis revealed a very strong negative correlation between total flavonoid content and anti-cholesterol activity (r=−0.997; p=0.050). The DES propylene glycol-lactic acid at a molar ratio of 2:1 yielded the highest total flavonoid content and the strongest anti-cholesterol activity.