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All Journal JOURNAL OF COASTAL DEVELOPMENT ILMU KELAUTAN: Indonesian Journal of Marine Sciences Jurnal Perikanan dan Kelautan Berkala Perikanan Terubuk Jurnal Ilmu Lingkungan Jurnal Online Mahasiswa (JOM) Bidang Perikanan dan Ilmu Kelautan Jurnal Perikanan dan Kelautan Jurnal Ruaya : Jurnal Penelitian dan Kajian Ilmu Perikanan dan Kelautan Asian Journal of Aquatic Sciences Jurnal Pengabdian Masyarakat Multidisiplin Unri Conference Series: Community Engagement Journal of Coastal and Ocean Sciences Journal of Rural and Urban Community Empowerment Abdimas Indonesian Journal Jurnal Ruaya : Jurnal Penelitian dan Kajian Ilmu Perikanan dan Kelautan Jurnal Perikanan dan Kelautan Jurnal Natur Indonesia
Nursyirwani, Nursyirwani
Universitas Riau
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EXTRACTION AND PURIFICATION OF CAROTENOID PIGMENTS SYNTHESIZED BY MARINE PHOTOSYNTHETIC BACTERIA AS A SOURCE OF NATURAL ANTIBIOTICS Kayla Difa; Nursyirwani Nursyirwani; Ummi Mardhiah Batubara
Asian Journal of Aquatic Sciences Vol. 9 No. 2 (2026): August
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ajoas.9.2.126-132

Abstract

Marine photosynthetic bacteria are microorganisms with the potential to produce bioactive compounds in the form of carotenoid pigments, which can be utilized as a natural source of antibacterial agents. This study aims to characterize the carotenoid pigments produced by the marine photosynthetic bacterial isolate LD04 and to determine their potential antibacterial activity against the pathogenic bacteria Pseudomonas aeruginosa, Escherichia coli, and Vibrio harveyi. The study was conducted using an exploratory descriptive method, involving bacterial culture, antibacterial activity testing using the disc diffusion method, biomass production, pigment extraction using methanol, and purification and characterization using Thin Layer Chromatography (TLC) and High-Performance Liquid Chromatography (HPLC). LC analysis yielded a single major spot, indicating the presence of a dominant pigment component in the extract. Further characterization by HPLC at a wavelength of 450 nm produced a peak at a retention time of 6.35 minutes, whereas the astaxanthin standard was detected at 28.2 minutes. This difference in retention time suggests that the main compound in the extract is likely a xanthophyll or a more polar carotenoid derivative. Antibacterial activity testing showed that the pigment extract was able to inhibit the growth of E. coli and V. harveyi, but showed no activity against P. aeruginosa. The largest inhibition zone diameters were obtained for E. coli at 5.63 mm and V. harveyi at 1.23 mm, classified as weak inhibition according to CLSI standards. Based on the research results, it can be concluded that the carotenoid pigments from the marine photosynthetic bacterial isolate LD04 have potential as a source of natural antibacterial agents, particularly against E. coli and V. harveyi.
THE ABILITY OF Bacillus sp. BACTERIA FROM THE ROKAN RIVER ESTUARINE WATERS TO DEGRADE MICROPLASTICS Andini Nurhidayah; Nursyirwani Nursyirwani; Feli Feliatra
Asian Journal of Aquatic Sciences Vol. 9 No. 2 (2026): August
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/ajoas.9.2.150-156

Abstract

Microplastic pollution in aquatic environments has emerged as a critical global environmental concern. Its presence has been widely detected in various environmental compartments, including estuaries. The objective of this study was to assess the ability of Bacillus sp. isolated from the Rokan River estuary waters to degrade microplastics, namely polystyrene (PS), polyethylene (PE), and polypropylene (PP), and to observe changes in their surface morphology using Scanning Electron Microscopy (SEM). The method used was a one-factor Completely Randomized Design (CRD) experiment with three replications. The degradation test was conducted gravimetrically over 60 days of incubation. The results showed that the highest average degradation rate was found in PE (4.09%), followed by PS (1.86%) and PP (1.19%). The Kruskal-Wallis statistical test yielded a p-value of 0.361 (p > 0.05), indicating no significant difference among the plastic types. SEM analysis confirmed morphological changes, including cracks, pores, and holes, on the surfaces of the treated plastics. The highest average bacterial count was found in the PE treatment (20.8 x 10¹⁰ CFU/mL), followed by PS (18.8 x 10¹⁰ CFU/mL) and PP (13.5 x 10¹⁰ CFU/mL). Therefore, it is concluded that Bacillus sp. has potential as an early indicator of microplastic biodegradation, although the degradation rate remains relatively low
Co-Authors ', Afrimansyah A.E.T.H. Wahyuni A.E.T.H. Wahyuni Afrimansyah ' Agnesia Endamg Tri Hastuti Wahyuni Agnesia Endang Tri Hastuti Wahyuni Alfarisy, M. Phyto Alfiati Silfi Andhini, Nadia Andini Nurhidayah Andrei Putra Zirma Anisa Qoriman Apriliani Indrawati Putri Aras Mulyadi Arman Effendi Asri, Zainul B.A. Moestomo Bachar, Sutan Barbara, Shanta Batubara, Ummi Mardhiah Benny Heltonika Bintal Amin BP, Valentina Dian Christine M Situmeang Claudia, Kristiwany Mayneke Darmawan, Ernanda P. Desi Anggreni Dessy Yoswati Dessy Yoswaty Desy Mutia Sari Devi Puspita Dewita Dewita Efriyeldi, Efriyeldi Elfis Suanto Elizal, Elizal Elkana Gabariel Fachry Abda El Rahman Fathoni, Ahmad Yusron Feliatra Feliatra, Feli Feliatra, Pamela Isya Ferdana, Gilang Fiki Harjuni Furqan, M. Alief Gavion Roston Sitepu Gina Ulfa Fitria Gunova, M Taufik Gunova, M. Taufik Gustina, Julia Gustina, Lenny Halima, Asyatul Hanies Ambarsari Hanifa, Zurya Haura, Sari R. Al Ida Rahayu Simanjuntak, Ida Rahayu Iesje Lukistyowati Ilham Ilahi Indri Wahyuni Irvina Nurachmi Irwan Effendi Joko Samiaji Julians, Rizky Fajar Kathy Copper Amolle Kayla Difa Lazuardi Lazuardi Lazuardi Umar Lestari, Anggi Lola Pitaloka br Barus Mahdiyah, Evfi Mahmudah, Dewi A. Mardalisa, Mardalisa Meiji Nurdiansyah Miptahul Huda Wassyukur Monika, Siska Mubarak Mubarak Mubarak Mubarak Muhammad Hafiz Perdana Muhammad Hafizh Muhammad Razali Mursawal, Asri Musrifin Galib Nabila Afifah Azuga Nainggolan, Robby Netti Aryani Nur Azizah Nursyafni Nanggola Oktavia, Dewi Asmiati Pakpahan, Deni Panjaitan, Grace P Povy Hutabarat Pratama, Bima Purba, Paedo Yayaki Puspita, Devi Putra, Rajiv R. Putri Ayu Putri, Redila Putri, Redila Aprilivia Putri, Resty Fauziah Rahmanda, Melysa Ramadhan, Ragiel Rinno Ferryno Roiman Pakpahan Ronal Kurniawan Saharudin Saharudin Sarbaini ' Sari, Desy Mutia Shaumi, Nurul Silitonga, Lamtiur Rotua Sinuraya, Tri Setia Darma Sophia Rahmah Saleha Sri Melinda Citra Sri Wahyuni Sufaidah, Siti Nur Suparmi Suparmi Syafri Syafri Syafruddin Nasution Syahada, Melania Syahril Nedi Syahrul Syahrul Thamrin Thamrin Thamrin Thamrin Tjipto Leksono Triyanto . Triyanto Triyanto Triyanto Triyanto Ummi Mardiah Batubara Usman Muhammad Tang Utami, Rahma I. Valentina Dian W. Asmara W. Asmara Widantari, Meilya Widya Asmara Windarti Windarti Wiya, Siti Ada WULANDARI, APRILIA Yahya Benardus Sihombing Yanti, Della Hijri Yoswati, Dessy Yulhadis Yulhadis Yuni Fitria Yurestira, Ilham Yusni Ikhwan Siregar Yusni Ikhwan Siregar Zebua, Abdi Hikmat Petra Zevira, Bella Permata Zhilalul Huda