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Reza Mohammadi - One of the best experts on this subject based on the ideXlab platform.
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Sonication alkaline-assisted preparation of Rhizopus oryzae biomass for facile bio-elimination of tetracycline antibiotic from an aqueous matrix.
Environmental Science and Pollution Research, 2020Co-Authors: Elnaz Azamateslamtalab, Mahboobeh Madani, Bahman Ramavandi, Reza MohammadiAbstract:The present study aimed to remove tetracycline (TET) antibiotic molecule from an aqueous medium using adsorbents prepared from Rhizopus oryzae biomass. The TET adsorption process was discontinuous and the adsorbent biomass was crude and NaOH-sonication-modified Rhizopus oryzae fungi. Specific active surface area for crude and modified Rhizopus oryzae was 10.38 m2/g and 20.32 m2/g, respectively. The results showed that the maximum TET adsorption efficiency was determined at pH 4, temperature 25 °C, initial TET concentration 10 mg/L, contact time 80 min, and biomass quantity 2 g/L. The equilibrium behavior showed that the Langmuir model suitably described the process. The maximum TET adsorption capacity was determined to be 38.02 mg/g and 67.93 mg/g, respectively, indicating that the method of biomass modification promoted the bio-adsorption capacity. A higher correlation coefficient (R2) and lower RMSE for the pseudo-first-order kinetic than other models showed its ability to describe the behavior of TET bio-adsorption. The enthalpy thermodynamic parameter (ΔH°) for the TET adsorption process was determined - 63.847 kJ/mol and - 85.226 kJ/mol for the raw and modified Rhizopus oryzae, respectively. Therefore, it can be suggested that the biomass of Rhizopus oryzae especially the modified version can be effectively used for the TET removal from aqueous environments.
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Sonication alkaline–assisted preparation of Rhizopus oryzae biomass for facile bio-elimination of tetracycline antibiotic from an aqueous matrix
Environmental Science and Pollution Research, 2020Co-Authors: Elnaz Azamateslamtalab, Mahboobeh Madani, Bahman Ramavandi, Reza MohammadiAbstract:The present study aimed to remove tetracycline (TET) antibiotic molecule from an aqueous medium using adsorbents prepared from Rhizopus oryzae biomass. The TET adsorption process was discontinuous and the adsorbent biomass was crude and NaOH-sonication–modified Rhizopus oryzae fungi. Specific active surface area for crude and modified Rhizopus oryzae was 10.38 m^2/g and 20.32 m^2/g, respectively. The results showed that the maximum TET adsorption efficiency was determined at pH 4, temperature 25 °C, initial TET concentration 10 mg/L, contact time 80 min, and biomass quantity 2 g/L. The equilibrium behavior showed that the Langmuir model suitably described the process. The maximum TET adsorption capacity was determined to be 38.02 mg/g and 67.93 mg/g, respectively, indicating that the method of biomass modification promoted the bio-adsorption capacity. A higher correlation coefficient (R^2) and lower RMSE for the pseudo-first-order kinetic than other models showed its ability to describe the behavior of TET bio-adsorption. The enthalpy thermodynamic parameter (ΔH°) for the TET adsorption process was determined − 63.847 kJ/mol and − 85.226 kJ/mol for the raw and modified Rhizopus oryzae , respectively. Therefore, it can be suggested that the biomass of Rhizopus oryzae especially the modified version can be effectively used for the TET removal from aqueous environments.
Elnaz Azamateslamtalab - One of the best experts on this subject based on the ideXlab platform.
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Sonication alkaline-assisted preparation of Rhizopus oryzae biomass for facile bio-elimination of tetracycline antibiotic from an aqueous matrix.
Environmental Science and Pollution Research, 2020Co-Authors: Elnaz Azamateslamtalab, Mahboobeh Madani, Bahman Ramavandi, Reza MohammadiAbstract:The present study aimed to remove tetracycline (TET) antibiotic molecule from an aqueous medium using adsorbents prepared from Rhizopus oryzae biomass. The TET adsorption process was discontinuous and the adsorbent biomass was crude and NaOH-sonication-modified Rhizopus oryzae fungi. Specific active surface area for crude and modified Rhizopus oryzae was 10.38 m2/g and 20.32 m2/g, respectively. The results showed that the maximum TET adsorption efficiency was determined at pH 4, temperature 25 °C, initial TET concentration 10 mg/L, contact time 80 min, and biomass quantity 2 g/L. The equilibrium behavior showed that the Langmuir model suitably described the process. The maximum TET adsorption capacity was determined to be 38.02 mg/g and 67.93 mg/g, respectively, indicating that the method of biomass modification promoted the bio-adsorption capacity. A higher correlation coefficient (R2) and lower RMSE for the pseudo-first-order kinetic than other models showed its ability to describe the behavior of TET bio-adsorption. The enthalpy thermodynamic parameter (ΔH°) for the TET adsorption process was determined - 63.847 kJ/mol and - 85.226 kJ/mol for the raw and modified Rhizopus oryzae, respectively. Therefore, it can be suggested that the biomass of Rhizopus oryzae especially the modified version can be effectively used for the TET removal from aqueous environments.
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Sonication alkaline–assisted preparation of Rhizopus oryzae biomass for facile bio-elimination of tetracycline antibiotic from an aqueous matrix
Environmental Science and Pollution Research, 2020Co-Authors: Elnaz Azamateslamtalab, Mahboobeh Madani, Bahman Ramavandi, Reza MohammadiAbstract:The present study aimed to remove tetracycline (TET) antibiotic molecule from an aqueous medium using adsorbents prepared from Rhizopus oryzae biomass. The TET adsorption process was discontinuous and the adsorbent biomass was crude and NaOH-sonication–modified Rhizopus oryzae fungi. Specific active surface area for crude and modified Rhizopus oryzae was 10.38 m^2/g and 20.32 m^2/g, respectively. The results showed that the maximum TET adsorption efficiency was determined at pH 4, temperature 25 °C, initial TET concentration 10 mg/L, contact time 80 min, and biomass quantity 2 g/L. The equilibrium behavior showed that the Langmuir model suitably described the process. The maximum TET adsorption capacity was determined to be 38.02 mg/g and 67.93 mg/g, respectively, indicating that the method of biomass modification promoted the bio-adsorption capacity. A higher correlation coefficient (R^2) and lower RMSE for the pseudo-first-order kinetic than other models showed its ability to describe the behavior of TET bio-adsorption. The enthalpy thermodynamic parameter (ΔH°) for the TET adsorption process was determined − 63.847 kJ/mol and − 85.226 kJ/mol for the raw and modified Rhizopus oryzae , respectively. Therefore, it can be suggested that the biomass of Rhizopus oryzae especially the modified version can be effectively used for the TET removal from aqueous environments.
R. Banerjee - One of the best experts on this subject based on the ideXlab platform.
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biosynthesis of tannase and gallic acid from tannin rich substrates by Rhizopus oryzae and aspergillus foetidus
Journal of Basic Microbiology, 2004Co-Authors: Gargi Mukherjee, R. BanerjeeAbstract:: Modified solid-state fermentation (MSSF) of tannin-rich substrates for production of tannase and gallic acid was carried out using two fungal cultures, Rhizopus oryzae (RO IIT RB-13, NRRL 21498) and Aspergillus foetidus (GMRB013 MTCC 3557). The tannin rich substrates included powdered fruits of Terminalia chebula and Caesalpinia digyna pod cover powder. The different environmental parameters for the maximum production of tannase and gallic acid were optimized through media engineering. The highest yield of tannase and gallic acid was obtained after 60 h in case of Rhizopus oryzae and after 72 h by Aspergillus foetidus with 3 ml of induced inoculum. The optimum initial pH of the fermentation was found to be 4.5 in case of Rhizopus oryzae and 5.0 for Aspergillus foetidus. MSSF was carried out at the optimum conditions of 30 degrees C and 80% relative humidity. Collectively, the data reveal the potential of the modified solid-state fermentation process for the production of tannase and gallic acid from tannin-rich substrates with R. oryzae and A. foetidus.
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Production of gallic acid by immobilization of Rhizopus oryzae
Bioprocess Engineering, 1997Co-Authors: S. K. Misro, R. Banerjee, M. R. Kumar, B. C. BhattacharyyaAbstract:Production of gallic acid using the immobilized cells of Rhizopus oryzae has been studied. It was observed that 2% tannic acid concentration, 200 numbers of calcium alginate beads of spore concentration 2 × 105/ml and initial pH 5.0 gave the maximum gallic acid production. The % of tannin conversion was 78.5% whereas in free cell culture, the % conversion was 83.5% in 4 days of incubation period. The beads were used for 3 times successfully. A drastic fall in the hydrolysis process was observed when the beads were treated with glutaraldehyde.
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Production of proteolytic enzyme by Rhizopus oryzae in a bubble column bioreactor
Bioprocess Engineering, 1995Co-Authors: S. Prasad, R. Banerjee, B. C. BhattacharyyaAbstract:Production of proteolytic enzyme in a bubble column bioreactor was carried out using the microorganism Rhizopus oryzae. Optimization of the production conditions were done adopting the EVOP (evolutionary operation technique). Studies on two variable and three variable parameters were carried out. The variable parameters were air flow rate, aeration time and incubation period. 8 hours aeration time per day, 1.66 vvm air flow rate and 2 days incubation was found to be optimum.
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Optimization of tannase biosynthesis by a newly isolated Rhizopus oryzae
Bioprocess Engineering, 1994Co-Authors: T. A. Hadi, R. Banerjee, B. C. BhattacharyyaAbstract:A strain isolated locally and identified as Rhizopus oryzae (RO, IIT KGP) was found to synthesise an extracellular enzyme, tanin acyl hydrolase, showing its degradability of tannic acid to gallic acid. For maximizing the enzyme secretion in the fermented broth, the influencing parameters were optimized in shake flask culture. Experiments showed that modified Czapek dox medium with 2% tannic acid, 1% glucose, 0.05% sodium nitrate incubated for 4 days with 2 days old inoculum was the optimum for the synthesis of tannase by Rhizopus oryzae (RO, IIT KGP). Maximum enzyme activity was found to be 6.12 U/ml.
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Kinetic properties of extracellular alkaline protease of Rhizopus oryzae
Journal of Fermentation and Bioengineering, 1993Co-Authors: R. Banerjee, B. C. BhattacharyyaAbstract:Abstract Production of alkaline protease by Rhizopus species is an unusual phenomenon. However, a locally isolated species of Rhizopus oryzae was found to secrete alkaline serine protease of industrial importance. The kinetic parameter V (reaction velocity) of the purified fractionated enzyme was evaluated under different environmental conditions and substrate to enzyme ratios. The Michaelis constant ( K m ) and maximum reaction velocity ( V max ) were also estimated.
B. C. Bhattacharyya - One of the best experts on this subject based on the ideXlab platform.
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Production of gallic acid by immobilization of Rhizopus oryzae
Bioprocess Engineering, 1997Co-Authors: S. K. Misro, R. Banerjee, M. R. Kumar, B. C. BhattacharyyaAbstract:Production of gallic acid using the immobilized cells of Rhizopus oryzae has been studied. It was observed that 2% tannic acid concentration, 200 numbers of calcium alginate beads of spore concentration 2 × 105/ml and initial pH 5.0 gave the maximum gallic acid production. The % of tannin conversion was 78.5% whereas in free cell culture, the % conversion was 83.5% in 4 days of incubation period. The beads were used for 3 times successfully. A drastic fall in the hydrolysis process was observed when the beads were treated with glutaraldehyde.
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Production of proteolytic enzyme by Rhizopus oryzae in a bubble column bioreactor
Bioprocess Engineering, 1995Co-Authors: S. Prasad, R. Banerjee, B. C. BhattacharyyaAbstract:Production of proteolytic enzyme in a bubble column bioreactor was carried out using the microorganism Rhizopus oryzae. Optimization of the production conditions were done adopting the EVOP (evolutionary operation technique). Studies on two variable and three variable parameters were carried out. The variable parameters were air flow rate, aeration time and incubation period. 8 hours aeration time per day, 1.66 vvm air flow rate and 2 days incubation was found to be optimum.
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Optimization of tannase biosynthesis by a newly isolated Rhizopus oryzae
Bioprocess Engineering, 1994Co-Authors: T. A. Hadi, R. Banerjee, B. C. BhattacharyyaAbstract:A strain isolated locally and identified as Rhizopus oryzae (RO, IIT KGP) was found to synthesise an extracellular enzyme, tanin acyl hydrolase, showing its degradability of tannic acid to gallic acid. For maximizing the enzyme secretion in the fermented broth, the influencing parameters were optimized in shake flask culture. Experiments showed that modified Czapek dox medium with 2% tannic acid, 1% glucose, 0.05% sodium nitrate incubated for 4 days with 2 days old inoculum was the optimum for the synthesis of tannase by Rhizopus oryzae (RO, IIT KGP). Maximum enzyme activity was found to be 6.12 U/ml.
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Kinetic properties of extracellular alkaline protease of Rhizopus oryzae
Journal of Fermentation and Bioengineering, 1993Co-Authors: R. Banerjee, B. C. BhattacharyyaAbstract:Abstract Production of alkaline protease by Rhizopus species is an unusual phenomenon. However, a locally isolated species of Rhizopus oryzae was found to secrete alkaline serine protease of industrial importance. The kinetic parameter V (reaction velocity) of the purified fractionated enzyme was evaluated under different environmental conditions and substrate to enzyme ratios. The Michaelis constant ( K m ) and maximum reaction velocity ( V max ) were also estimated.
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Purification of alkaline protease of Rhizopus oryzae by foam fractionation
Bioprocess Engineering, 1993Co-Authors: R. Banerjee, Rajeev Agnihotri, B. C. BhattacharyyaAbstract:Studies on the cost effective purification method is very much essential for the industrially important enzyme like protease. As foam fractionation is an important technique in downstream processing of the biologicals, purification of the crude proteolytic enzyme produced by Rhizopus oryzae has been attempted using converging-diverging foam fractionator. The effects of different parameters studied on the purification efficiency by foam fractionation were pH of the broth, air flow rate, initial liquid height. The results obtained were found quite encouraging at pH 10 with 1 LPM of air flow rate at low initial liquid height.
Jinhyeuk Kwon - One of the best experts on this subject based on the ideXlab platform.
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Soft Rot of Rhizopus oryzae as a Postharvest Pathogen of Banana Fruit in Korea.
Mycobiology, 2012Co-Authors: Jinhyeuk Kwon, Jae-san Ryu, Tran Thi Phuong Chi, Shun-shan Shen, Okhee ChoiAbstract:Soft rot on banana fruit caused by Rhizopus oryzae was identified for the first time in Korea. Colonies were white to light brown and formed numerous sporangiospores. Optimum temperature for mycelial growth was 30℃. Sporangia were globose and 30~200 µm. Sporangiophores were usually straight, 8~20 µm, and rhizoids usually in groups of 3~5. Columella were globose to sub-globose and 90~110 µm. Sporangiospores were sub-globose or oval and 4~10 µm. Based on its mycological characteristics, molecular analysis, and pathogenicity to host plants, this fungus was identified as Rhizopus oryzae Went & Prisen Geerligs. This is the first report of soft rot on banana caused by Rhizopus oryzae in Korea.
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soft rot on citrus unshiu caused by Rhizopus oryzae in korea
Research in Plant Disease, 2011Co-Authors: Jinhyeuk Kwon, Jae Wook Hyun, Hongsik ShimAbstract:Soft rot caused by Rhizopus oryzae occurred on unshiu orange (Citrus unshiu Marc.) sampled from commercial markets in Jinju, Korea, 2010. The first symptom of soft rot on orange is a water-soaked appearance of the affected tissue. The infected parts later disintegrated into a mushy mass of disorganized cells followed by rapid softening of the diseased tissue. The lesion on orange was rapidly softened and rotted, then became brown or dark brown. Optimum temperature for mycelial growth of the causal fungus on potato dextrose agar was and growth was still apparent at . Sporangiophores were in diameter. Sporangia were globose and in size. The color of sporangia was brownish-grey to blackish-grey at maturity. Sporangiospores were sub-globose, brownish- black streaked and in size. Columella were globose to sub-globose and in size. On the basis of mycological characteristics, pathogenicity test, and the ITS sequence analysis, the causal fungus was identified as Rhizopus oryzae. To our knowledge, this is the first report of soft rot caused by R. oryzae on unshiu orange in Korea.
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First Report of Rhizopus oryzae as a Postharvest Pathogen of Apple in Korea.
Mycobiology, 2011Co-Authors: Jinhyeuk Kwon, Jinwoo Kim, Won-il KimAbstract:Soft rot in apple caused by Rhizopus oryzae was found for the first time in Korea. A detailed description of the specimen is given along with its internal transcribed spacer rDNA sequence. The fungus was identified as Rhizopus oryzae based on the mycological characteristics, molecular data, and pathogenicity testing.
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Soft Rot on Cucumis melo var. makuwa Caused by Rhizopus oryzae
Mycobiology, 2010Co-Authors: Jinhyeuk Kwon, Hongsik ShimAbstract:Rhizopus oryzae is reported for the first time on Cucumis melo L. var. makuwa Makino. A detailed description of this Korean specimen is given, along with its rDNA internal transcribed spacer sequence. On the basis of mycological characteristics and molecular data, the fungus was identified as R. oryzae Went & Prinsen Geerligs.