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PENETAPAN KADAR POLIFENOL DARI EKSTRAK DAN NANOPARTIKEL EKSTRAK DAUN AFRIKA (Vernonia amygdalina.Del.) MENGGUNAKAN METODE SPEKTROFOTOMETRI UV-Vis

Abstract

Daun afrika (Vernonia amygdalina Del.) dikenal kaya akan metabolit sekunder seperti flavonoid, tanin dan polifenol, yang berperan sebagai antioksidan. Ekstraksi yang dilakukan menggunakan metode maserasi dengan pelarut etanol 70%, dan nanopartikel dibuat menggunakan polimer kitosan dan Na-alginat. Tujuan dari penelitian ini untuk menentukan kadar polifenol dari ekstrak dan nanopartikel ekstrak daun afrika (Vernonia amygdalina Del.) menggunakan metode spektrofotometri UV-Vis. Analisis kadar polifenol menggunakan preaksi folinciocalteu dan Na2CO3 7,5% pada Panjang glombang 765nm. Hasil menunjukkan bahwa kadar polifenol tertinggi diperoleh pada ekstrak daun afrika sebesar 4,98% sedangkan kadar pada nanopartikel berkisar antara 1,25-4,12%. Formula nanopartikel dengan Na-alginat 0,325% menunjukkan hasil terbaik mendekati kadar pada ekstrak.

African leaves (Vernonia amygdalina Del.) are known to be rich in secondary metabolites such as flavonoids, tannins, and polyphenols, which act as antioxidants. Extraction was carried out using a maceration method with 70% ethanol as a solvent, and nanoparticles were made using chitosan polymer and Na-alginate. The purpose of this study was to determine the polyphenol content of the extract and nanoparticles of African leaves (Vernonia amygdalina Del.) using UV-Vis spectrophotometry. Polyphenol content analysis used the Folinciocalteu reaction and 7.5% Na2CO3 at a wavelength of 765 nm. The results showed that the highest polyphenol content was obtained in the African leaf extract at 4.98%, while the content in the nanoparticles ranged from 1.25-4.12%. The nanoparticle formula with 0.325% Na-alginate showed the best results, approaching the content in the extract.

Keywords

Daun Afrika, Polifenol, Nanopartikel, Spektrofotometri UV-Vis,Na-alginat, Kitosan., African leaves, polyphenols, nanoparticles, UV-Vis spectrophotometry, Na-alginate, chitosan.

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