Annisa Salsabila Zahrotul ‘Izzah & Muhammad Iqbal Filayani 212 Copyright©2022 Jurnal Biotek p-ISSN: 2581-1827 (print), e-ISSN: 2354-9106 (online) Website: http://journal.uin-alauddin.ac.id/index.php/biotek/index Karakterisasi Bakteri Potensial Pengurai Plastik di Kawasan Bakau Sine Tulungagung Annisa Salsabila Zahrotul ‘Izzah 1* , Muhammad Iqbal Filayani 1 1 Universitas Islam Negeri Sayyid Ali Rahmatullah Tulungagung, Indonesia *Correspondence email: sannisa572@gmail.com (Submitted: 30-10-2022, Revised: 26-12-2022, Accepted: 27-12-2022) ABSTRAK Penggunaan plastik masih digemari oleh sebagian besar masyarakat hingga saat ini, hal tersebut mengakibatkan meningkatnya jumlah sampah plastik. Salah satu bakteri yang mampu melakukan bioremediasi plastik adalah bakteri yang terdapat di ekosistem bakau. Keberadaan ekosistem bakau juga dapat ditemukan di Pantai Sine Tulungagung, namun belum pernah ada eksplorasi lebih lanjut mengenai keberadaan bakteri pengurai plastik. Penelitian ini dilakukan guna mengeksplorasi keberadaan bakteri potensial di kawasan bakau pantai Sine Tulungagung, yang dapat menguraikan plastik. Penelitian ini menggunakan metode kualitatif deksriptif yang diawali dengan penanaman sampel plastik di endapan bakau, kemudian dilakukan pengambilan sampel bakteri di kawasan bakau Pantai Sine Tulungagung. Sampel bakteri diperoleh dengan metode isolasi sehingga didapatkan hasil sebanyak 21 isolat bakteri hasil eksplorasi, yang akan dilakukan uji pengurangan berat plastik. Bakteri yang berpotensi menguraikan plastik selanjutnya dilakukan identifikasi melalui uji morfologi (warna, bentuk, tepian, elevasi, ukuran) dan uji biokimia (pewarnaan gram dan enzim katalase). Ditemukan persentase pengurangan berat plastik tertinggi sebesar 6,97%, dengan karakteristik terbanyak berbentuk coccus atau bulat berjenis gram negatif. Kata Kunci: bakau, bakteri pengurai plastik, bioremediasi, pantai sine Tulungagung ABSTRACT The use of plastic is still favored by most people today, which has increased the amount of plastic waste. One of the bacteria that can carry out plastic bioremediation is found in mangrove ecosystems. The existence of the mangrove ecosystem is found on Sine Tulungagung Beach, but there has never been further exploration regarding the presence of plastic-degrading bacteria. This research was conducted to explore the presence of potential plastic-degrading bacteria in the mangrove area of the Sine Tulungagung coast. This study used a descriptive-qualitative method that began with planting plastic samples in mangrove deposits, followed by taking bacterial samples from the mangrove area of Sine Beach, Tulungagung. 21 bacteria were isolated from the exploration and tested for their ability to reduce the weight of the plastic. Bacteria with the ability to decompose plastic were then identified using morphological (color, shape, edges, elevation, and size) and biochemical (gram staining and catalase enzyme) tests. It was found that the highest plastic weight reduction was 6.97%, with the most characteristics in the form of coccus and gram- negative bacteria. Keywords: mangroves, plastic decomposing bacteria, bioremediation, Tulungagung sine beach