1
|
Li H, Zhang M, Zhang Y, Xu X, Zhao Y, Jiang X, Zhang R, Gui Z. Characterization of Cellulose-Degrading Bacteria Isolated from Silkworm Excrement and Optimization of Its Cellulase Production. Polymers (Basel) 2023; 15:4142. [PMID: 37896386 PMCID: PMC10610594 DOI: 10.3390/polym15204142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 09/28/2023] [Accepted: 10/07/2023] [Indexed: 10/29/2023] Open
Abstract
An abundance of refractory cellulose is the key limiting factor restricting the resource utilization efficiency of silkworm (Bombyx mori) excrement via composting. Screening for cellulose-degrading bacteria is likely to provide high-quality strains for the safe and rapid decomposition of silkworm excrement. In this study, bacteria capable of degrading cellulose with a high efficiency were isolated from silkworm excrement and the conditions for cellulase production were optimized. The strains were preliminarily screened via sodium carboxymethyl cellulose culture and staining with Congo red, rescreened via a filter paper enzyme activity test, and identified via morphological observation, physiological and biochemical tests, and phylogenetic analysis of the 16S rDNA sequence. Enzyme activity assay was performed using the 3,5-dinitrosalicylic acid method. DC-11, a highly cellulolytic strain, was identified as Bacillus subtilis. The optimum temperature and pH of this strain were 55 °C and 6, respectively, and the filter paper enzyme activity (FPase), endoglucanase activity (CMCase), and exoglucanase activity (CXase) reached 15.40 U/mL, 11.91 U/mL, and 20.61 U/mL. In addition, the cellulose degradation rate of the treatment group treated with DC-11 was 39.57% in the bioaugmentation test, which was significantly higher than that of the control group without DC-11 (10.01%). Strain DC-11 was shown to be an acid-resistant and heat-resistant cellulose-degrading strain, with high cellulase activity. This strain can exert a bioaugmentation effect on cellulose degradation and has the potential for use in preparing microbial inocula that can be applied for the safe and rapid composting of silkworm excrement.
Collapse
Affiliation(s)
- Hao Li
- College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China; (H.L.)
- Sericulture Resources Intensive Processing Laboratory, Sericulture Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang 212100, China
| | - Minqi Zhang
- College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China; (H.L.)
| | - Yuanhao Zhang
- College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China; (H.L.)
| | - Xueming Xu
- College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China; (H.L.)
| | - Ying Zhao
- College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China; (H.L.)
| | - Xueping Jiang
- College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China; (H.L.)
| | - Ran Zhang
- College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China; (H.L.)
- Sericulture Resources Intensive Processing Laboratory, Sericulture Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang 212100, China
| | - Zhongzheng Gui
- College of Biotechnology, Jiangsu University of Science and Technology, Zhenjiang 212100, China; (H.L.)
- Sericulture Resources Intensive Processing Laboratory, Sericulture Research Institute, Chinese Academy of Agricultural Sciences, Zhenjiang 212100, China
| |
Collapse
|
2
|
Cao L, Sun H, Ma Y, Lu M, Zhao M, Li E, Liu Y. Analysis and enhancement of the energy utilization efficiency of corn stover using strain Lsc-8 in a bioelectrochemical system. Microb Cell Fact 2023; 22:54. [PMID: 36935505 PMCID: PMC10024844 DOI: 10.1186/s12934-023-02058-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 03/07/2023] [Indexed: 03/21/2023] Open
Abstract
The strain Lsc-8 can produce a current density of 33.08 µA cm-2 using carboxymethylcellulose (CMC) as a carbon source in a three-electrode configuration. A co-culture system of strain Lsc-8 and Geobacter sulfurreducens PCA was used to efficiently convert cellulose into electricity to improve the electricity generation capability of microbial fuel cells (MFCs). The maximum current density achieved by the co-culture with CMC was 559 μA cm-2, which was much higher than that of strain Lsc-8 using CMC as the carbon source. The maximum power density reached 492.05 ± 52.63 mW cm-2, which is much higher than that previously reported. Interaction mechanism studies showed that strain Lsc-8 had the ability to secrete riboflavin and convert cellulose into acetic acid, which might be the reason for the high electrical production performance of the co-culture system. In addition, to the best of our knowledge, a co-culture or single bacteria system using agricultural straw as the carbon source to generate electricity has not been reported. In this study, the maximum current density of the three-electrode system inoculated with strain Lsc-8 was 14.56 μA cm-2 with raw corn stover as the sole carbon source. Raw corn stover as a carbon source was also investigated for use in a co-culture system. The maximum current density achieved by the co-culture was 592 μA cm-2. The co-culture system showed a similar electricity generation capability when using raw corn stover and when using CMC. This research shows for the first time that a co-culture or single bacteria system can realize both waste biomass treatment and waste power generation.
Collapse
Affiliation(s)
- Lianbin Cao
- College of Biological and Food Engineering, Huanghuai University, No. 76 Kaiyuan Road, Zhumadian, 463000, Henan, People's Republic of China
| | - Hongmei Sun
- College of Biological and Food Engineering, Huanghuai University, No. 76 Kaiyuan Road, Zhumadian, 463000, Henan, People's Republic of China
| | - Yamei Ma
- Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, No. 22 Xinong Road, Yangling, 712100, Shaanxi, People's Republic of China
| | - Mingguo Lu
- College of Biological and Food Engineering, Huanghuai University, No. 76 Kaiyuan Road, Zhumadian, 463000, Henan, People's Republic of China
| | - Mengrui Zhao
- College of Biological and Food Engineering, Huanghuai University, No. 76 Kaiyuan Road, Zhumadian, 463000, Henan, People's Republic of China
| | - Enzhong Li
- College of Biological and Food Engineering, Huanghuai University, No. 76 Kaiyuan Road, Zhumadian, 463000, Henan, People's Republic of China
| | - Ying Liu
- Shaanxi Key Laboratory of Agricultural and Environmental Microbiology, College of Life Sciences, Northwest A&F University, No. 22 Xinong Road, Yangling, 712100, Shaanxi, People's Republic of China.
| |
Collapse
|
3
|
Alves TP, Triques CC, Silva EA, Fagundes‐Klen MR, Hasan SDM. Multi‐enzymatic recovery of fungal cellulases (
Aspergillus niger
) through solid‐state fermentation of sugarcane bagasse. CAN J CHEM ENG 2021. [DOI: 10.1002/cjce.24292] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Tales P. Alves
- Center of Engineering and Exact Sciences Western Paraná State University Toledo Brazil
| | - Carina C. Triques
- Center of Engineering and Exact Sciences Western Paraná State University Toledo Brazil
| | - Edson A. Silva
- Center of Engineering and Exact Sciences Western Paraná State University Toledo Brazil
| | | | - Salah D. M. Hasan
- Center of Engineering and Exact Sciences Western Paraná State University Toledo Brazil
| |
Collapse
|
4
|
Antolini E. Lignocellulose, Cellulose and Lignin as Renewable Alternative Fuels for Direct Biomass Fuel Cells. CHEMSUSCHEM 2021; 14:189-207. [PMID: 32991061 DOI: 10.1002/cssc.202001807] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 09/27/2020] [Indexed: 06/11/2023]
Abstract
In recent years the use of renewable sources, such as lignocellulosic biomass (LCB), as the fuel for various types of fuel cells received growing interest. Different types of fuel cells, that is, operated at low temperatures (T<100 °C; microbial fuel cells (MFC), alkaline (AFCs) and flow fuel cells (FFCs)), intermediate temperatures (T in the range 150-300 °C, proton-conducting inorganic-organic composite membrane fuel cells), and high temperatures (T≥500 °C, direct carbon fuel cells (DCFCs)), have been used for the conversion of the chemical energy in LCB to electrical energy. The economic advantage of the direct use of LCB consists of avoiding the acid hydrolysis of cellulose to glucose for low-temperature fuel cells and the pretreatment at high temperatures necessary to convert biomass to biochar (pyrolysis) in the case of high-temperature fuel cells. In this Review, the characteristics of direct biomass fuel cells are presented and their performance is compared with that of indirect biomass fuel cells fed with glucose (low-temperature fuel cells) and biochar (high-temperature fuel cells).
Collapse
Affiliation(s)
- Ermete Antolini
- Scuola di Scienza dei Materiali, Via 25 aprile 22, Cogoleto, 16016, Genova, Italy
| |
Collapse
|
5
|
Metal oxide-cellulose nanocomposites for the removal of toxic metals and dyes from wastewater. Int J Biol Macromol 2020; 164:2477-2496. [DOI: 10.1016/j.ijbiomac.2020.08.074] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 08/07/2020] [Accepted: 08/07/2020] [Indexed: 02/07/2023]
|