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ENDAH RETNANINGRUM
Microbiology Laboratory, Faculty of Biology, Universitas Gadjah Mada. Jl. Teknika Selatan, Sekip Utara, Sleman 55281, Yogyakarta, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Optimization of manganese bioleaching activity and molecular characterization of indigenous heterotrophic bacteria isolated from the sulfuric area DENAYA ANDRYA PRASIDYA; WAHYU WILOPO; I WAYAN WARMADA; ENDAH RETNANINGRUM
Biodiversitas Journal of Biological Diversity Vol. 20 No. 7 (2019)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d200716

Abstract

Abstract. Prasidya DA, Wilopo W, Warmada IW, Retnaningrum E. 2019. Optimization of manganese bioleaching activity and molecular characterization of indigenous heterotrophic bacteria isolated from the sulfuric area. Biodiversitas 20: 1904-1909.  The present research evaluated the manganese bioleaching potency of a heterotrophic bacteria KB3B1. This bacterial strain has been isolated from sulfuric area located at Ungaran, Middle of Java, Indonesia using modified 9K medium by adding of several organic nutrients. The manganese bioleaching activities of the strain was analysed by applying of varying glycine concentrations (0, 5, 10, 15 mg mL-1) with pyrolusite pulp densities of 0.02 g cm-3 on a rotary shaker at 180 rpm for 18 days incubation. Several parameters, including the growth of bacteria, pH values, the concentration of soluble manganese and cyanide, were investigated at the interval of 3 days. Molecular characteristics of the strain were further analyzed based on 16S rDNA gene sequences. After 15 days, the maximum yield of manganese 16.6% was achieved under the addition of 10 mg mL-1 glycine. This maximum extract obtained was followed by the maximum bacterial growth, pH, and cyanide product of the strain. Phylogenetic analysis showed that the strain was closely related with Bacillus niacini EP89. Besides, the average frequencies of guanine and cytosine (G+C) of the strain was in same range as that of the reference bacteria in the GenBank and Bergey's Manual Systematics of Bacteria.
Activities and molecular characterization of petroleum hydrocarbons degrading rhizobacteria from mangrove plants (Rhizophora sp.) in Kulon Progo, Yogyakarta, Indonesia Vivekananda Vinsensius Benget; ENDAH RETNANINGRUM
Biodiversitas Journal of Biological Diversity Vol. 21 No. 1 (2020)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d210104

Abstract

Abstract. Benget VV, Retnaningrum E. 2020. Activities and molecular characterization of petroleum hydrocarbons degrading rhizobacteria from mangrove plants (Rhizophora sp.) in Kulon Progo, Yogyakarta, Indonesia. Biodiversitas 21: 21-27. The increasing number of human population density around mangrove ecosystems has resulted in its pollution, particularly oil spills. Rhizobacteria have metabolic abilities that make them possible to live in polluted environmental conditions and the potential to be biological agents for oil remediation. However, investigations of rhizobacteria especially from rhizospheres of mangrove plants (Rhizophora sp.) and their potential use in remediation remains limited. Therefore, the purposes of this research were to investigate the ability of selected isolate in the degradation of petroleum hydrocarbons and identify its isolate using 16S rRNA gene. Observation of that degradation ability was conducted by inoculating the isolate in Bushnell-Haas Minimal Salt (BHMS) medium containing crude petroleum 0.01 %. After 10 days of incubation, the degradation hydrocarbons were analyzed by measuring Total Petroleum Hydrocarbons (TPH) using Gas Chromatography-Flame Ionization Detector (GC-FID) method. Four rhizobacteria isolate from rhizospheres of mangrove plants (Rhizophora sp), NMKP1, NMKP2, NMKP3, and NMKP4 were analyzed based on their growth in Bushnell-Haas Minimal Salt (BHMS) medium containing crude petroleum 0.01 %. The results revealed that NMKP4 isolate had the highest specific growth rate. In addition, it could degrade those hydrocarbons pollutants as much of 98.72 % within 10 days. Based on molecular characterization showed that NMKP4 isolate was in the same cluster as Pseudomonas sp. CO03.
Diversity of lactic acid bacteria isolated during fermentation of indigenous cassava obtained from Sumba, East Nusa Tenggara, Indonesia IMMANUELLA BERLIANA ELVANI HUTAJULU; PERISKILA DINA KALI KULLA; Endah Retnaningrum
Biodiversitas Journal of Biological Diversity Vol. 22 No. 7 (2021)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d220703

Abstract

Abstract. Hutajulu IBE, Kulla PDK, Retnaningrum E. 2021. Diversity of lactic acid bacteria isolated during fermentation of indigenous cassava obtained from Sumba, East Nusa Tenggara, Indonesia. Biodiversitas 22: 2561-2570. Traditional fermented food products hold a great significance in the routine diet of Indonesian inhabitants. The present study investigated the diversity of lactic acid bacteria (LAB) found in fermented indigenous cassava, ubi karet busuk, produced in Sumba, East Nusa Tenggara, Indonesia. The isolated LAB was characterized for their phenotypic, biochemical, and molecular traits, which involved 16S rRNA gene sequencing, determination of lactic acid fermentation pathway, and measurement of b-glucosidase and tannase activity in the LAB strains. During fermentation, 15 LAB strains were obtained from the cassava. Among these, 93.33% strains were found to be homofermentative, whereas 6.73% strains displayed heterofermentative traits. BLASTn and phylogenetic analysis classified 15 LAB strains into six species, namely Enterococcus faecium, Enterococcus faecalis, Enterococcus casseliflavus, Leuconostoc mesenteroides, Lactococcus lactis, and Enterococcus sp. Among these, 10 LAB strains displayed b-glucosidase activity, with highest enzyme activity of 7.13 U/mL recorded in L. lactis F14IS3. Interestingly, two of these strains also showed expression of tannase, with F6IS1 strain displaying highest enzyme activity of 38.23 U/mL. Thus, the study results highlighted the suitability of these b-glucosidase and tannase-producing LAB strains to be used as a starter in the fermentation of cassava and other substrates such as vegetables, fruits, and legumes. These strains can also be utilized in animal feed, food, and beverage industries.
Enhancement of manganese extraction in a biochar-enriched bioleaching column with a mixed culture of indigenous bacteria Endah Retnaningrum; WAHYU WILOPO; I WAYAN WARMADA
Biodiversitas Journal of Biological Diversity Vol. 22 No. 5 (2021)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d220560

Abstract

Abstract. Retnanimgrum E, Wilopo W, Warmada IW. 2021. Enhancement of manganese extraction in a biochar-enriched bioleaching column with a mixed culture of indigenous bacteria. Biodiversitas 22: 2949-2955. Biochar can improve manganese ore extraction during bioleaching by inducing redox reactions and providing a porous matrix for bacterial attachment. In this research, the effect of variations in biochar concentration on the performance of a bioleaching column with a mixed culture of Acidithiobacillus sp. KL3 and Bacillus niacini KB3B1 were studied comprehensively for 30 days. Addition of 0.4% biochar resulted in 89% manganese extraction. Bioleaching with biochar promoted the oxidation of sulfur and yielded high sulfate concentrations, much better pH, and excellent oxidation–reduction potential conditions. The bacteria in the mixed culture survived and adapted to the extreme column environment by releasing extracellular polymeric substance, as evidenced by the sharp increase in the content of the material in the column to 135.7 mg/g over 30 days of incubation. The synergistic effect of the bacteria in the mixed culture greatly contributed to the mechanism of manganese extraction in the column, as indicated by changes in relative bacterial abundance, which is related to bacterial community succession during bioleaching. The relative abundance of B. niacini KB3B1 gradually increased and peaked at 30% over 9 days of measurements. By comparison, the abundance of Acidithiobacillus sp. KL3 first decreased over 9 days of bioleaching and then increased to a maximum of 80% in the final stages of the process. This finding reveals that biochar addition could enhance the mechanisms of bioleaching and improve the yield of manganese extraction.
Co-Authors DENAYA ANDRYA PRASIDYA I WAYAN WARMADA I WAYAN WARMADA IMMANUELLA BERLIANA ELVANI HUTAJULU PERISKILA DINA KALI KULLA Vivekananda Vinsensius Benget WAHYU WILOPO WAHYU WILOPO