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Dinia R Dwijayanti,
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Biotropika
Published by Universitas Brawijaya
ISSN : 23027282     EISSN : 25498703     DOI : 10.21776/ub.biotropika.
Core Subject : Science, Agriculture,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Immunology & microbiology
Biotropika: Journal of Tropical Biology invites research articles, short communication, and reviews describing new findings/phenomena of biological sciences in tropical regions, specifically in the following subjects, but not limited to biotechnology, biodiversity, microbiology, botany, zoology, biosystematics, ecology, and environmental sciences.
Arjuna Subject : -
Articles 572 Documents
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Analysis Physicochemical and In Vitro Antibacterial Activity of White Pomegranate Peel Extract (Punica granatum L.) Azizah, Nur; Ma'rifah, Shofia Jannatul; Jamilah, Zahrotul; Syarivah, Thoifatus; Harmono Putri, Nabiilah Rifda; Ramadhan, Majida; Faisal
Biotropika: Journal of Tropical Biology Vol. 14 No. 2 (2026)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.biotropika.2026.014.02.07

Abstract

Antibacterial agents from natural biological compounds can originate from phenolic compounds found in plants, including the white pomegranate fruit. However, the use of white pomegranate peel is still relatively unknown to the public, so it is often discarded, even though this part contains phenolic compounds and flavonoids that have potential as natural antibacterial agents. This study aimed to analyse the physicochemical characteristics of white pomegranate peel extract (Punica granatum L.) and evaluate its antibacterial activity against Staphylococcus aureus and Escherichia coli. Peak absorption, wavelength, and functional groups were analysed using UV-Vis and FTIR, while antibacterial activity was tested using the well-diffusion method. The extract was tested at concentrations of 25%, 50%, 75%, and 100% as the treatment factors. The physicochemical test results showed that the moisture content of the simplicia was 3.378%, which met the quality criteria of good simplicia, while the ash content of 19.27% indicated a fairly high mineral content. The UV-Vis spectrum showed absorption at wavelengths of 230–295 nm, indicating the presence of flavonoid compounds, while FTIR results confirmed the presence of alcohol and phenolic functional groups. Antibacterial tests showed that white pomegranate peel extract inhibited the growth of E. coli and S. aureus with the largest inhibition zones at a concentration of 100%, measuring 20 mm and 23 mm, respectively. Based on the inhibition strength category, this extract was strong against E. coli and very strong against S. aureus. Thus, white pomegranate peel extract has the potential to be developed as an effective natural antibacterial agent.
Ecological Characteristics and Community Utilisation of Mangrove Ecosystems in West Biak, Central Papua, Indonesia Likumahua, Engly Sisilya; Boli, Paulus; Pattiasina, Selfinus; Pattiasina, Thomas Frans; Purba, Gandi Yantri Sevantina
Biotropika: Journal of Tropical Biology Vol. 14 No. 2 (2026)
Publisher : Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.biotropika.2026.014.02.08

Abstract

Mangrove ecosystems are increasingly threatened by human activities, such as tree cutting, waste disposal, and land conversion for various purposes. Similar pressures occur in the coastal region of West Biak, Papua, Indonesia. This study aimed to analyse the ecological condition of mangrove ecosystems and to identify community activities related to mangrove utilisation. The research was conducted over a three-month period, from March to May 2024, in Sopendo and Mamoribo Villages, West Biak District, Biak Numfor Regency, covering a total area of 52.91 ha. Mangrove vegetation data were collected using line transects and quadrat plots, while information on community activities was obtained through interviews and questionnaires. Mangrove vegetation structure was analysed using the Importance Value Index (IVI) while species diversity was assessed using the Shannon–Wiener Diversity Index. Interview data were analysed descriptively to identify patterns of community utilisation of mangrove resources. A total of twelve mangrove species were identified. Rhizophora apiculata showed the highest IVI values, reaching 85.66 in Mamoribo and 105.08 in Sopendo, indicating its strong dominance within the mangrove community structure. The ecological condition of the mangrove ecosystem is closely linked to community utilisation activities, where mangrove diversity and species dominance support various local livelihood practices. There are seven activities carried out within the mangrove forest area. Tree cutting, bark stripping, and waste disposal in coastal areas are activities that directly have detrimental impacts on mangrove forests. These findings highlight both the ecological significance of mangrove species in the region and the high level of community dependence on mangrove resources, emphasising the need for sustainable management strategies to maintain ecosystem integrity while supporting local livelihoods.

Page 58 of 58 | Total Record : 572

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