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All Journal Biodiversitas Journal of Biological Diversity
RISA NOFIANI
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Tanjungpura. Jl. Prof. Dr. Hadari Nawawi, Pontianak 78124, West Kalimantan, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Anti-bacteria and toxicity potential of a rare Actinobacterium Pseudonocardia sp. SM1A, isolated from Mangrove Park, West Kalimantan, Indonesia RISA NOFIANI; RIZKY RIZKY; RIDHO BRILIANTORO; PUJI ARDININGSIH
Biodiversitas Journal of Biological Diversity Vol. 23 No. 1 (2022)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d230148

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Abstract. Nofiani R, Rizky, Briliantoro R, Ardiningsih P. 2021. Anti-bacteria and toxicity potential of a rare Actinobacterium Pseudonocardia sp. SM1A, isolated from Mangrove Park, West Kalimantan, Indonesia. Biodiversitas 23: 453-458. This study aimed to identify and evaluate antibacterial and toxicity activities of a rare Actinobacterium isolated from mangrove mud, Mempawah District, West Kalimantan. The mangrove mud sample was inoculated on ISP4 agar dissolved with seawater enriched meropenem (75µg/mL) and nystatin (100 µg/mL) using pour plate procedure and incubated at room temperature until the appearance powdery colony. One of the 2 powdery colonies successfully isolated was SM1A. SM1A was morphologically and biochemically identified to determine its genus and tested antibacterial activities using the cross streak method. SM1A also was cultivated and shaken at room temperature. After 10 days, the culture was extracted using ethyl acetate and then the extract was tested antibacterial activities using a well diffusion method and toxicity using brine shrimp lethality test (BSLT). SM1A was identified as Pseudonocardia sp., then was called Pseudonocardia sp. SM1A. Pseudonocardia sp. SM1A tested anti-bacteria using the cross streak method showed active against Staphylococcus aureus, Salmonella typhi, Escherichia coli, Pseudomonas aeruginosa, Vibrio cholera, and Streptococcus mutants for the ISP4 agar medium and S. typhi, S. mutants, and V. cholera for the ISP1. Pseudonocardia sp. SM1A extract prepared from ISP1 broth medium was active against S. typhi, E. coli, V. cholera, and Streptococcus mutants. In addition, Pseudonocardia sp. SM1A extract cultivated on ISP1 broth medium showed LC50=11.2570 µg/mL based on the BSLT and categorized as moderately toxic level. Pseudonocardia sp. SM1A contained secondary metabolites having high potential as lead compounds for drug discovery.
Bioremoval of Pb2+ by Aspergillus niger D1RA, A heavy metal-resistant fungus isolated from an illegal gold mining site RISA NOFIANI; RITA MU’IN; HAFIZAH HAFIZAH; PUJI ARDININGSIH
Biodiversitas Journal of Biological Diversity Vol. 25 No. 8 (2024)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d250822

Abstract

Abstract. Nofiani R, Mu’in R, Hafizah, Ardiningsih P. 2024. Bioremoval of Pb2+ by Aspergillus niger D1RA, A heavy metal-resistant fungus isolated from an illegal gold mining site. Biodiversitas 25: 2504-2511. Heavy metal pollution can cause serious problems for the environment and human health. One of the methods to eliminate this pollution is to use heavy metal-resistant fungi isolated from heavy metal-polluted environments. This study aimed to investigate the ability of heavy metal-resistant fungi to remove Pb2+ in liquid media, Potato Dextrose Broth (PDB). Samples were collected from two locations, namely an abandoned illegal gold mining site and illegal gold mine, Samalantan, Bengkayang District, West Kalimantan, Indonesia. Each sample was inoculated on two different agar media (PDA= Potato Dextrose Agar and MEA= Malt Extract Agar) supplemented with 7.5 ppm HgCl2. All fungal species that grew on the surface media were isolated, identified (based on spore morphology and Internal Transcribed Spacer [ITS]), evaluated (tolerance index [TI] against Hg2+, Pb2+, and Zn2+), and assessed for their bioaccumulation capacity and Pb2+removal efficiency. Four isolates (Aspergillus sp. OK2A, Aspergillus sp. OEA, Aspergillus sp. OEB and OEC) were successfully isolated from the abandoned illegal gold mine, while only one isolate (Aspergillus niger D1RA) was isolated from the illegal gold mining site. On the eighth day of incubation, the high tolerance level of each fungus to various selected metal concentrations was Aspergillus sp. OK2A in 40 ppm HgCl2 and 300 ppm ZnCl2; Aspergillus sp. OEA in 40 ppm HgCl2 and 1,200 ppm ZnCl2; Aspergillus sp. OEB in 800 ppm Pb(NO3)2; OEC in 20 ppm HgCl2; A. niger D1RA in 40 ppm HgCl2, 1,200 ppm Pb(NO3)2, 300 ppm ZnCl2. Only A. niger D1RA showed a high tolerance for three metals and was further analyzed to determine the bioaccumulation capacity and removal efficiency of Pb2+. The best bioaccumulation capacity and removal efficiency of Pb2+ in PDB medium supplemented with 100 ppm Pb(NO3)2 at pH 4 were 237.776 mg/g dried biomass and 93.266 %, respectively. In conclusion, A. niger D1RA has the potential as a bioremediation agent to remediate Pb2+ environments.
Co-Authors HAFIZAH HAFIZAH PUJI ARDININGSIH PUJI ARDININGSIH RIDHO BRILIANTORO RITA MU’IN RIZKY RIZKY