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Evi mustiqawati
Politeknik Baubau
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Journal : Jurnal Sains dan Kesehatan

 1 
Uji Aktivitas Antioksidan Ekstrak Metanol Daun Belimbing Wuluh (Averrhoa bilimbi) Evi Mustiqawati; Suparman Supardi; Juniadin Juniadin
Jurnal Sains & Kesehatan Vol 1 No 1 (2022): Jurnal Sains dan Kesehatan
Publisher : Politeknik Baubau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (653.583 KB) | DOI: 10.57151/jsika.v1i1.17

Abstract

Belimbing wuluh leaves contain active substances such as flavonoids, saponins, tannins, sulfur, formic acid, peroxidase, calcium oxalate and potassium citrate. Tannins, flavonoids and saponins which have antibacterial activity. Many plants contain antioxidants, one of which is starfruit leaves (Averrhoa bilimbi). Antioxidants are substances that can neutralize free radicals so that atoms with unpaired electrons gain electron pairs. This study aims to determine the antioxidant activity of the methanol extract of star fruit (Averrhoa Blimbi) leaves. The maceration process was carried out on samples of star fruit leaves (Averrhoa Blimbi) and then extracted using methanol as a solvent to analyze the antioxidant activity contained in the leaves of star fruit (Averrhoa Blimbi) using methanol. UV-vis spectrophotometry method. The results of the research that has been carried out on UV-vis spectrophotometry with a wavelength of 517 and has been incubated for 30 minutes shows the IC50 value of the methanol extract of starfruit leaves (Averrhoa Blimbi) of 288.82 mg/mL. The conclusion of this study is the antioxidant properties of methanol extract. Belimbing wuluh leaves contain compounds that act as antioxidants.
Uji Kadar Vitamin C Bawang Dayak dan Bawang Merah Menggunakan Titrasi Iodimetri Wa Jumi; Evi Mustiqawati; Hasty Hamzah
Jurnal Sains & Kesehatan Vol 2 No 1 (2023): Jurnal Sains dan Kesehatan
Publisher : Politeknik Baubau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (223.372 KB) | DOI: 10.57151/jsika.v2i1.155

Abstract

Vitamin C is an important compound for the human body. The fuction of vitamin C is to form collagen and antioxidants that the body needs. This study aims to determine the levels of vitamin C in dayak onions (Eleutherine Palmifolia (L.) Merr) and red shallots (Allium Ascalocinum L.) using iodimetric titration. To tests the levels of vitamin C using the iodimetric method. The results of vitamin C levels carried out in three consecutive titrations had a concentration value of 46,5 mg/g in dayak onions with an average value of 5,67 mL and a concentration value in shallots of 39,7 mg/g with an average value of 4,8 mL.
Co-Authors Ambarwati Ambarwati Azanuddin Azanuddin Elisna Elisna Hasty Hamzah Isrul Isrul Juniadin Juniadin Muhammad Tasjiddin Teheni Ratih Nurwanti Rizky Rahmawati Alami Sri Yolandari Suparman Supardi Wa Jumi Wa Ode Syafriah