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Antioxidant Activity Assessment and Profiling of Total Phenolic and Flavonoid Contents in Bay Leaf Extract (Syzygium polyanthum Folium) Hutagaol, Cindy Jesika; Yunus, Muhammad; Piska, Finna
PCJN: Pharmaceutical and Clinical Journal of Nusantara Vol. 4 No. 02 (2026): PCJN: Pharmaceutical and Clinical Journal of Nusantara
Publisher : CV. Nusantara Scientific Medical

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58549/pcjn.v4i02.152

Abstract

Bay leaf (Syzygium polyanthum (Wight) Walp.) is a traditional medicinal plant containing phenolic and flavonoid compounds with potential antioxidant properties. Free radicals contribute to various degenerative diseases, highlighting the need for safe and effective natural antioxidants. This study aimed to evaluate the antioxidant activity of ethanolic extract of bay leaves using the DPPH method and to determine its total phenolic and flavonoid contents. This experimental laboratory study employed maceration extraction using 96% ethanol. Antioxidant activity was assessed by the DPPH radical scavenging assay at 517 nm and expressed as IC₅₀ value. Total phenolic content was determined using the Folin–Ciocalteu method at 765 nm and expressed as mg gallic acid equivalents (GAE)/g extract, while total flavonoid content was measured using the AlCl₃ colorimetric method at 430 nm and expressed as mg quercetin equivalents (QE)/g extract. The results showed that the ethanolic extract exhibited a strong antioxidant activity with an IC₅₀ value of 33.43 ppm. The total flavonoid content was 14.4992 mg QE/g extract (1.4499%) with excellent linearity (r² = 0.99747), while the phenolic calibration curve showed good linearity (r² = 0.99045). In conclusion, the ethanolic extract of S. polyanthum leaves demonstrates strong antioxidant activity supported by its phenolic and flavonoid contents, indicating its potential as a natural antioxidant source.
Inhibisi Enzim α-Glukosidase oleh Bacillus Megaterium ITU 9 Isolat Sumber Air Panas Sumatera Utara Finna Piska; Chrismis Novalinda Ginting; Harmileni Harmileni; Edy Fachrial
Journal of Pharmascience Vol. 11 No. 1 (2024): Jurnal Pharmascience
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jps.v11i1.17045

Abstract

Diabetes adalah penyakit multifaktor yang insidensinya meningkat dengan pesat di negara berkembang. Diabetes mellitus (DM) tipe 2 adalah jenis diabetes yang paling umum ditemui, dimana penyakit ini erat kaitannya dengan kemajuan industri dan teknologi sehingga mempengaruhi gaya hidup seseorang. Penanggulangan penyakit ini dapat dilakukan dengan menghambat aktivitas α-glukosidase. Beberapa mikroorganisme terutama dari sumber air panas dapat dimanfaatkan sebagai penghasil senyawa inhibitor α-glukosidase. Pada penelitian sebelumnya isolat Bacillus megaterium ITU 9 merupakan isolat yang diisolasi dari sumber air panas. Pada penelitian ini diuji kemampuan isolat Bacillus megaterium ITU 9 sebagai penghasil inhibitor α-glukosidase dengan metode sumur. Daya persen inhibisi supernatan B. megaterium ITU 9 terhadap kerja enzim α-glukosidase adalah sebesar 46,67%, sedangkan daya persen inhibisi acarbose yaitu 70%. Dalam hal ini B. megaterium ITU 9 termofilik memiliki daya inhibisi terhadap enzim α-glukosidase. Kata Kunci: Bakteri Termofilik, Inhibitor, Akarbose, Metode Sumur, Persen Inhibisi Diabetes is a multifactorial disease whose incidence is increasing rapidly in developing countries. Diabetes mellitus (DM) type 2 is the most common type of diabetes, where this disease is closely related to industrial and technological advances, thus affecting a person's lifestyle. This disease can be controlled by inhibiting α-glucosidase activity. Several microorganisms, especially from hot springs, can be used to produce α-glucosidase inhibitor compounds. In previous research, the Bacillus megaterium ITU 9 isolate was an isolate isolated from hot springs. In this study, the ability of the Bacillus megaterium ITU 9 isolate to produce α-glucosidase inhibitors was tested using the well method. The percent inhibition power of B. megaterium ITU 9 supernatant on the action of the α-glucosidase enzyme was 46.67%, while the percent inhibition power of acarbose was 70%. In this case, the thermophilic B. megaterium ITU 9 has inhibitory power against the α-glucosidase enzyme.
Uji Efektivitas Ekstrak Etanol Daun Jarak Pagar (Jatropha curcas L.) dalam Menurunkan Kadar Gula Darah pada Mencit (Mus musculus) yang Diinduksi Glukosa Monohidrat Nadira Aisyah Lubis; Erida Novriani; Finna Piska
Jurnal Ilmiah Kedokteran dan Kesehatan Vol. 5 No. 2 (2026): Mei: Jurnal Ilmiah Kedokteran dan Kesehatan
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/klinik.v5i2.6414

Abstract

Diabetes mellitus is a chronic metabolic disorder with an increasing global prevalence, emphasizing the need for safe, effective, and affordable alternative therapies. This study aimed to evaluate the antidiabetic potential of ethanol extract from physic nut leaves (Jatropha curcas L.) in reducing blood glucose levels in glucose monohydrate–induced mice (Mus musculus). An experimental design was applied using 25 male mice divided into five groups: a negative control group receiving Na-CMC, a positive control group treated with glibenclamide (5 mg), and three treatment groups administered ethanol extract doses of 21.8 mg/25 g body weight, 43.7 mg/25 g body weight, and 65.6 mg/25 g body weight. Blood glucose levels were measured to assess the hypoglycemic effect of each treatment. The results showed that the ethanol extract of Jatropha curcas leaves significantly reduced blood glucose levels compared to the control groups (p < 0.05). The highest dose, 65.6 mg/25 g body weight, demonstrated the greatest reduction in blood glucose levels. These findings suggest that ethanol extract of physic nut leaves has promising potential as a natural antidiabetic agent and may serve as an alternative therapeutic option for diabetes management.