https://ejurnal.unima.ac.id/index.php/ibj/issue/feed 2025-07-08T07:41:51+00:00 Yermia Semuel Mokosuli yermiamokosuli@unima.ac.id Open Journal Systems <p><strong>Indonesian Biodiversity Journal (<a href="https://issn.brin.go.id/terbit/detail/1588572808" target="_blank" rel="noopener">ISSN: 2722-2659</a>)</strong> is an open access journal published by Universitas Negeri Manado. Published articles are original research relevant to the field of biology, and reviewed by two reviewers in a blind review. Indonesian Biodiversity Journal, abbreviated as IBJ, publishes research from all fields of biological science, such as biodiversity, ecology, physiology, behavior, molecular biology, biotechnology and biopharmaceuticals. All forms of life, from microbes, viruses, fungi, plants, animals, to humans, are covered in the Indonesian Biodiversity Journal (IBJ). Our Editorial Board members are international and national researchers actively researching in the field of biological sciences, ensuring an efficient, fair and constructive peer review process. The Indonesian Biodiversity Journal is published every 4 months (April, August and December). This journal has been accredited by <a title="sinta 5" href="https://sinta.kemdikbud.go.id/journals/profile/14886">Sinta 5</a>.</p> https://ejurnal.unima.ac.id/index.php/ibj/article/view/12553 2025-06-28T14:51:07+00:00 Axel Wuwungan axelwuwungan2025@gmail.com Nonny Manampiring nonny@unima.ac.id Sukmarayu Gedoan sukmagedoan@unima.ac.id Yermia Semuel Mokosuli yermiamokosuli@unima.ac.id Verawati Ida Yani Roring verawatiroring@unima.ac.id

<p>Indonesia is a highly biodiverse country, second only to Brazil. This gives Indonesia enormous potential in ethnopharmacology. Previous studies have shown that the leaves of the Brugmansia suaveolens plant, also known as Angel trumpet, have high antioxidant activity. The aim of this study is to test the antioxidant activity of B. suaveolens flowers and conduct quantitative screening to determine which compounds play the greatest role in their antioxidant activity. This research used the DPPH test and Gas Chromatography-Mass Spectrometry (GC-MS) screening. Ascorbic acid was used as the comparator in this study. Before the DPPH and GC-MS testing, the samples were extracted using the cold maceration technique with a 95% ethanol solvent. Then, the samples were concentrated using a rotary evaporator. The IC₅₀ value of the ethanol extract of B. suaveolens flowers is 196.16 µg/mL, while the IC₅₀ value of ascorbic acid, the comparator, is 3,814 µg/mL. This result shows that the ethanol extract of B. suaveolens flowers has moderate antioxidant activity. Screening bioactive compounds with GC-MS showed that Hexadecenoic acid and Octadecanoic acid play the biggest role in antioxidant activity. However, the compound with the highest content in the ethanol extract of B. suaveolens flowers is scopolamine.</p>

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