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Shakilanishi S, Mrudula P, Shanthi C. Production of dehairing protease by Bacillus cereus VITSN04: a model cradle-to-cradle approach for sustainable greener production of leathers. ENVIRONMENTAL TECHNOLOGY 2024; 45:180-191. [PMID: 35848414 DOI: 10.1080/09593330.2022.2102938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 07/09/2022] [Indexed: 06/15/2023]
Abstract
Despite several attempts over decades, process scalability and sustainability remain a challenge to produce an environmental-friendly enzyme to gain industrial attention. In the present study, microbial degradation of chrome shavings (chromium-collagen leather waste) and the resulting collagen hydrolysate for producing the dehairing protease by Bacillus cereus VITSN04 were investigated in a lab-scale fermentor. Scale-up degradation of shavings resulted in higher recovery of collagen hydrolysate (76%) within 72 h compared to shake flasks (68% in 120 h). Earlier achieved medium composition of collagen hydrolysate (12 g L-1) and molasses (15 g L-1) appeared to induce amylase at the high rate, despite the maximal production of protease (203.8 ± 0.18 U mL-1), which was analysed by ANS fluorescence spectroscopy. Optimization of the media containing collagen hydrolysate (12 g L-1) and molasses (5 g L-1) was effective in producing protease (170.6 ± 0.1 U mL-1) and reduced the co-synthesis of amylase (48.2 ± 0.09 U mL-1). The controlled fermentation process by feeding molasses during the exponential growth phase had enhanced the dehairing protease production (∼2.96 fold). The produced protease then partitioned through the biphasic system and showed significant dehairing of goat skins on the pilot scale. Thus, the scalability of the process to produce dehairing enzymes using waste, generated at the site of its use, offers hope for sustainable greener production of leathers.
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Affiliation(s)
- S Shakilanishi
- Department of Biotechnology, School of BioSciences and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, India
| | - P Mrudula
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore, Tamil Nadu, India
| | - C Shanthi
- Department of Biotechnology, School of BioSciences and Technology, Vellore Institute of Technology, Vellore, Tamil Nadu, India
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2
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Nagabalaji V, Maharaja P, Nishanthi R, Sathish G, Suthanthararajan R, Srinivasan SV. Effect of co-culturing bacteria and microalgae and influence of inoculum ratio during the biological treatment of tannery wastewater. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 341:118008. [PMID: 37146488 DOI: 10.1016/j.jenvman.2023.118008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 04/12/2023] [Accepted: 04/22/2023] [Indexed: 05/07/2023]
Abstract
This present investigation is carried out to study the effect of algal and bacterial inoculum concentrations on the removal of organic pollutants and nutrients from the tannery effluent by the combined symbiotic treatment process. The bacterial and microalgal consortia was developed in laboratory setup and mixed together to perform this study. The Influence of algae and bacteria inoculum concentrations on the removal of pollutants such as Chemical Oxygen Demand (COD) and Total Kjeldahl Nitrogen (TKN) were studied using statistical optimization through Response surface methodology. For the design of experimental set up and optimization, full factorial Central composite design was used. The profiles of pH, Dissolved Oxygen (DO) and nitrate were also monitored and studied. The inoculum concentrations of microalgae and bacteria showed significant effect on Co-culturing on COD, TKN and nitrate removals as major response. The linear effect of bacterial inoculum has positive dominant influence on COD and TKN removal efficiencies. Nitrate utilization by microalgae increases with the increase in microalgal inoculum concentration. The maximum removal efficiencies of COD and TKN with 89.9% and 80.9% were obtained at optimum bacterial and algal inoculum concentrations of 6.7 g/L and 8.0 g/L respectively. These outcomes of this study are immensely favorable for maximizing the COD and nitrogen (nutrients) removal capabilities of microalgae-bacterial consortia in tannery effluent.
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Affiliation(s)
- Velmurugan Nagabalaji
- Environmental Engineering Department, CSIR-Central Leather Research Institute, Chennai, 600 020, India; Academy of Scientific and Industrial Research (AcSIR), Ghaziabad, 201002, India.
| | - Pounsamy Maharaja
- Environmental Engineering Department, CSIR-Central Leather Research Institute, Chennai, 600 020, India
| | - Rajendiran Nishanthi
- Environmental Engineering Department, CSIR-Central Leather Research Institute, Chennai, 600 020, India
| | - Ganesan Sathish
- Environmental Engineering Department, CSIR-Central Leather Research Institute, Chennai, 600 020, India
| | | | - Shanmugham Venkatachalam Srinivasan
- Environmental Engineering Department, CSIR-Central Leather Research Institute, Chennai, 600 020, India; Academy of Scientific and Industrial Research (AcSIR), Ghaziabad, 201002, India.
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3
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Li X, Zhang Q, Xu Z, Jiang G, Gan L, Tian Y, Shi B. High-expression and characterization of a novel serine protease from Ornithinibacillus caprae L9 T with eco-friendly applications. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:35996-36012. [PMID: 35060042 DOI: 10.1007/s11356-021-17495-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 11/08/2021] [Indexed: 06/14/2023]
Abstract
In the current work, a novel thermophilic serine protease gene (P3862) from Ornithinibacillus caprae L9T was functionally expressed in Bacillus subtilis SCK6. The monomeric enzyme of about 29 kDa was purified to homogeneity with 43.91% of recovery and 2.81-folds of purification. Characterization of the purified protease revealed the optimum activity at pH 7 and 65 °C. The protease exhibited excellent activity and stability in the presence of Na+, Mg2+, Ca2+, ethanediol, n-hexane, Tween-20, Tween-80 and Triton X-100. P3862 displayed favorable caseinolytic activity, moderate keratinolytic activity but no collagenolytic activity. Besides, the homology model of P3862 possessed a globular configuration and characteristic of α/β hydrolase fold, and displayed stable interactions with casein, glycoprotein and keratin rather than collagen. Moreover, the crude enzyme could completely dehair goatskin within 6 h, resulting in decrease in BOD5, COD and TSS loads by 72.86, 74.07, and 73.79%, respectively, as compared with Na2S treatment. Biocatalytic applications revealed that it could effectively remove egg-stains from fabrics at 37 °C for 30 min with low supplementation (300 U/mL), and was able to degrade the feathers of duck and chicken. Overall, these outstanding properties make P3862 valuable in the development of environmentally friendly biotechnologies .
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Affiliation(s)
- Xiaoguang Li
- Key Laboratory of Leather Chemistry and Engineering, Ministry of Education and College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, People's Republic of China
| | - Qian Zhang
- Key Laboratory of Bio-Resources and Eco-Environment, Ministry of Education and College of Life Sciences, Sichuan University, Chengdu, 610065, People's Republic of China
| | - Zhe Xu
- Key Laboratory of Leather Chemistry and Engineering, Ministry of Education and College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, People's Republic of China
| | - Guangyang Jiang
- Key Laboratory of Leather Chemistry and Engineering, Ministry of Education and College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, People's Republic of China
| | - Longzhan Gan
- Key Laboratory of Leather Chemistry and Engineering, Ministry of Education and College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, People's Republic of China
| | - Yongqiang Tian
- Key Laboratory of Leather Chemistry and Engineering, Ministry of Education and College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, People's Republic of China.
| | - Bi Shi
- Key Laboratory of Leather Chemistry and Engineering, Ministry of Education and College of Biomass Science and Engineering, Sichuan University, Chengdu, 610065, People's Republic of China.
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4
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David Troncoso F, Alberto Sánchez D, Luján Ferreira M. Production of Plant Proteases and New Biotechnological Applications: An Updated Review. ChemistryOpen 2022; 11:e202200017. [PMID: 35286022 PMCID: PMC8919702 DOI: 10.1002/open.202200017] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2022] [Revised: 02/21/2022] [Indexed: 12/14/2022] Open
Abstract
An updated review of emerging plant proteases with potential biotechnological application is presented. Plant proteases show comparable or even greater performance than animal or microbial proteases for by-product valorization through hydrolysis for, for example, cheese whey, bird feathers, collagen, keratinous materials, gelatin, fish protein, and soy protein. Active biopeptides can be obtained as high added value products, which have shown numerous beneficial effects on human health. Plant proteases can also be used for wastewater treatment. The production of new plant proteases is encouraged for the following advantages: low cost of isolation using simple procedures, remarkable stability over a wide range of operating conditions (temperature, pH, salinity, and organic solvents), substantial affinity to a broad variety of substrates, and possibility of immobilization. Vegetable proteases have enormous application potential for the valorization of industrial waste and its conversion into products with high added value through low-cost processes.
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Affiliation(s)
- Franco David Troncoso
- Departamento de Ingeniería QuímicaUniversidad Nacional del Sur (UNS)Bahía Blanca8000Argentina
- Planta Piloto de Ingeniería QuímicaPLAPIQUI (UNS-CONICET)Bahía Blanca8000Argentina
| | - Daniel Alberto Sánchez
- Departamento de Ingeniería QuímicaUniversidad Nacional del Sur (UNS)Bahía Blanca8000Argentina
- Planta Piloto de Ingeniería QuímicaPLAPIQUI (UNS-CONICET)Bahía Blanca8000Argentina
| | - María Luján Ferreira
- Departamento de QuímicaUniversidad Nacional del Sur (UNS)Bahía Blanca8000Argentina
- Planta Piloto de Ingeniería QuímicaPLAPIQUI (UNS-CONICET)Bahía Blanca8000Argentina
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Li X, Zhang S, Zhang Q, Gan L, Jiang G, Tian Y, Shi B. Characterization and application of a novel halotolerant protease with no collagenase activity for cleaner dehairing of goatskin. Process Biochem 2022. [DOI: 10.1016/j.procbio.2022.01.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Li X, Zhang Q, Gan L, Jiang G, Tian Y, Shi B. Exoproduction and Biochemical Characterization of a Novel Serine Protease from Ornithinibacillus caprae L9 T with Hide-Dehairing Activity. J Microbiol Biotechnol 2022; 32:99-109. [PMID: 34818664 PMCID: PMC9628834 DOI: 10.4014/jmb.2108.08037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 11/18/2021] [Accepted: 11/18/2021] [Indexed: 12/15/2022]
Abstract
This study is the first report on production and characterization of the enzyme from an Ornithinibacillus species. A 4.2-fold increase in the extracellular protease (called L9T) production from Ornithinibacillus caprae L9T was achieved through the one-factor-at-a-time approach and response surface methodological optimization. L9T protease exhibited a unique protein band with a mass of 25.9 kDa upon sodium dodecyl sulfate-polyacrylamide gel electrophoresis. This novel protease was active over a range of pH (4-13), temperatures (30-80°C) and salt concentrations (0-220 g/l), with the maximal activity observed at pH 7, 70°C and 20 g/l NaCl. Proteolytic activity was upgraded in the presence of Ag+, Ca2+ and Sr2+, but was totally suppressed by 5 mM phenylmethylsulfonyl fluoride, which suggests that this enzyme belongs to the serine protease family. L9T protease was resistant to certain common organic solvents and surfactants; particularly, 5 mM Tween 20 and Tween 80 improved the activity by 63 and 15%, respectively. More importantly, L9T protease was found to be effective in dehairing of goatskins, cowhides and rabbit-skins without damaging the collagen fibers. These properties confirm the feasibility of L9T protease in industrial applications, especially in leather processing.
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Affiliation(s)
- Xiaoguang Li
- Key Laboratory of Leather Chemistry and Engineering, Ministry of Education and College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, P.R. China
| | - Qian Zhang
- Key Laboratory of Bio-Resources and Eco-Environment, Ministry of Education and College of Life Sciences, Sichuan University, Chengdu 610065, P.R. China
| | - Longzhan Gan
- Key Laboratory of Leather Chemistry and Engineering, Ministry of Education and College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, P.R. China
| | - Guangyang Jiang
- Key Laboratory of Leather Chemistry and Engineering, Ministry of Education and College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, P.R. China
| | - Yongqiang Tian
- Key Laboratory of Leather Chemistry and Engineering, Ministry of Education and College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, P.R. China,Corresponding authors Y. Tian Phone: +86-28-85405237 Fax: +86-28-85405237 E-mail:
| | - Bi Shi
- Key Laboratory of Leather Chemistry and Engineering, Ministry of Education and College of Biomass Science and Engineering, Sichuan University, Chengdu 610065, P.R. China,
B. Shi E-mail:
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7
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Pérez de la Lastra JM, Baca-González V, González-Acosta S, Asensio-Calavia P, Otazo-Pérez A, Morales-delaNuez A. Antibodies targeting enzyme inhibition as potential tools for research and drug development. Biomol Concepts 2021; 12:215-232. [PMID: 35104929 DOI: 10.1515/bmc-2021-0021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Accepted: 12/31/2021] [Indexed: 12/29/2022] Open
Abstract
Antibodies have transformed biomedical research and are now being used for different experimental applications. Generally, the interaction of enzymes with their specific antibodies can lead to a reduction in their enzymatic activity. The effect of the antibody is dependent on its narrow i.e. the regions of the enzyme to which it is directed. The mechanism of this inhibition is rarely a direct combination of the antibodies with the catalytic site, but is rather due to steric hindrance, barring the substrate access to the active site. In several systems, however, the interaction with the antibody induces conformational changes on the enzyme that can either inhibit or enhance its catalytic activity. The extent of enzyme inhibition or enhancement is, therefore, a reflection of the nature and distribution of the various antigenic determinants on the enzyme molecule. Currently, the mode of action of many enzymes has been elucidated at the molecular level. We here review the molecular mechanisms and recent trends by which antibodies inhibit the catalytic activity of enzymes and provide examples of how specific antibodies can be useful for the neutralization of biologically active molecules.
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Affiliation(s)
- José Manuel Pérez de la Lastra
- Biotechnology of macromolecules. Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), San Cristóbal de la Laguna, Tenerife, Spain
| | - Victoria Baca-González
- Biotechnology of macromolecules. Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), San Cristóbal de la Laguna, Tenerife, Spain.,Escuela Doctorado y Estudios de Posgrado. Universidad de La Laguna (ULL). C/ Pedro Zerolo, s/n. 38200. San Cristóbal de La Laguna. S/C de Tenerife, Spain
| | - Sergio González-Acosta
- Biotechnology of macromolecules. Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), San Cristóbal de la Laguna, Tenerife, Spain
| | - Patricia Asensio-Calavia
- Biotechnology of macromolecules. Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), San Cristóbal de la Laguna, Tenerife, Spain.,Escuela Doctorado y Estudios de Posgrado. Universidad de La Laguna (ULL). C/ Pedro Zerolo, s/n. 38200. San Cristóbal de La Laguna. S/C de Tenerife, Spain
| | - Andrea Otazo-Pérez
- Biotechnology of macromolecules. Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), San Cristóbal de la Laguna, Tenerife, Spain.,Escuela Doctorado y Estudios de Posgrado. Universidad de La Laguna (ULL). C/ Pedro Zerolo, s/n. 38200. San Cristóbal de La Laguna. S/C de Tenerife, Spain
| | - Antonio Morales-delaNuez
- Biotechnology of macromolecules. Instituto de Productos Naturales y Agrobiología (IPNA-CSIC), San Cristóbal de la Laguna, Tenerife, Spain
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8
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A substrate protection approach to applying the calcium ion for improving the proteolysis resistance of the collagen. Appl Microbiol Biotechnol 2021; 105:9191-9209. [PMID: 34841465 DOI: 10.1007/s00253-021-11704-1] [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: 08/22/2021] [Revised: 11/16/2021] [Accepted: 11/20/2021] [Indexed: 10/19/2022]
Abstract
Enzymatic dehairing, as a crucial part of cleaner leather processing, has reached processive advancement with potentially replacing the traditional hair removal due to increasing pressure from environmental demand. However, this cleaner technology based on proteases has a problem that the hide grain (collagen-rich structure) is susceptible to be hydrolyzed, decreasing the quality of finished leather. From the perspective of improving the stability of collagen fibers and their resistance to proteolysis, a method for protecting the hide grain during the enzymatic dehairing process was developed. The results showed that calcium ions had a swelling effect on collagen fibers under near-neutral conditions (pH 6.0-10.0), decreasing the thermal stability of collagen and the proteolysis resistance of collagen significantly. The alkaline environment (pH 10.0-12.0) will promote the dissociation of carboxyl groups in hide collagen, promoting the combination of calcium ions and carboxyl groups. This strategy can change the surface charge of collagen fibers and strengthen the connection between collagen fibers, thus improving protease resistance and the thermal stability of collagen. However, collagen fibers could swell violently once the alkalinity of the solution environment was extreme. Despite the above situation, calcium ion was still conducive to maintain the structural stability of collagen fibers. At pH 10.0-12.0, pretreating animal hide with a solution containing calcium ions can improve the protease resistance of hide grain, making the hide grain well-protected. This method provided an effective way to establish a safer enzymatic unhairing technology based on substrate protection. KEY POINTS: • A collagen protection method for hair removal of animal hide was developed. • This method applied calcium ions to collagen at alkaline conditions (pH 10.0-12.0). • Pretreatment results of calcium ions at different pH values on animal hide were compared.
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9
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Wang H, Cai C, Gan L, Tian Y. New application of SptA protease: A cleaner and potential water-conserving approach to dehairing of skin. BIOCATAL BIOTRANSFOR 2021. [DOI: 10.1080/10242422.2021.2003788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Hongbin Wang
- College of Biomass Science and Engineering, Sichuan University, Chengdu, PR China
- Key Laboratory of Leather Chemistry and Engineering (Sichuan University), Ministry of Education, Chengdu, PR China
| | - Chufan Cai
- College of Biomass Science and Engineering, Sichuan University, Chengdu, PR China
- Key Laboratory of Leather Chemistry and Engineering (Sichuan University), Ministry of Education, Chengdu, PR China
| | - Longzhan Gan
- College of Biomass Science and Engineering, Sichuan University, Chengdu, PR China
- Key Laboratory of Leather Chemistry and Engineering (Sichuan University), Ministry of Education, Chengdu, PR China
| | - Yongqiang Tian
- College of Biomass Science and Engineering, Sichuan University, Chengdu, PR China
- Key Laboratory of Leather Chemistry and Engineering (Sichuan University), Ministry of Education, Chengdu, PR China
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Gao M, Zhang X, Tian Y, Zhang C, Peng B. Development and validation of a label-free method for measuring the collagen hydrolytic activity of protease. Bioprocess Biosyst Eng 2021; 44:2525-2539. [PMID: 34405273 DOI: 10.1007/s00449-021-02624-5] [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: 05/12/2021] [Accepted: 08/11/2021] [Indexed: 11/29/2022]
Abstract
Collagen is the most abundant fibrous structural protein, and therefore, the quantitative evaluation of the effect of protease on collagen has a profound influence on enzyme application. In this research, unlabeled native bovine hide powder was utilized to detect collagen hydrolytic activity of the protease. The optimum conditions of the determination method were as follows: 30 mg/mL substrate concentration, 30 min reaction time, and 2-9 U/mL enzyme concentration. Then, several typical industrial protease preparations were chosen to measure collagenolytic activities at different temperatures and pH values, whose change trends were quite distinct from those of proteolytic activity assay method based on casein or dye-labeled hide powder substrate. Especially, in the pH 5-7, casein hydrolytic activities of these proteases showed sharper peaks with relative activity from 6% to 100%, whereas, their collagen hydrolytic activities based on native hide powder exhibited 30-100% with broader peaks. And collagen hydrolytic activities resulted from using dye-labeled substrate reached a lower optimum pH value than that of other methods. Besides, the results of these measurements displayed a moderate degree of reproducibility. This method is more reasonable than the protease assay method using casein or labeled hide powder as the substrate in many fields.
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Affiliation(s)
- Mengchu Gao
- Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu, 610065, China
| | - Xu Zhang
- Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu, 610065, China
| | - Yongxin Tian
- Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu, 610065, China
| | - Chunxiao Zhang
- Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu, 610065, China.,National Engineering Research Center of Clean Technology in Leather Industry, Sichuan University, Chengdu, 610065, China
| | - Biyu Peng
- Key Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu, 610065, China. .,National Engineering Research Center of Clean Technology in Leather Industry, Sichuan University, Chengdu, 610065, China.
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11
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Ben Elhoul M, Zaraî Jaouadi N, Bouacem K, Allala F, Rekik H, Mechri S, Khemir Ezzine H, Miled N, Jaouadi B. Heterologous expression and purification of keratinase from Actinomadura viridilutea DZ50: feather biodegradation and animal hide dehairing bioprocesses. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:9921-9934. [PMID: 33159682 DOI: 10.1007/s11356-020-11371-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 10/21/2020] [Indexed: 06/11/2023]
Abstract
The keratin-degrading bacterium Actinomadura viridilutea DZ50 secretes a keratinase (KERDZ) with potential industrial interest. Here, the kerDZ gene was extracellularly expressed in Escherichia coli BL21(DE3)pLysS using pTrc99A vector. The recombinant enzyme (rKERDZ) was purified and biochemically characterized. Results showed that the native and recombinant keratinases have similar biochemical characteristics. The conventional dehairing with lime and sodium sulfide degrades the hair to the extent that it cannot be recovered. Thus, these chemical processes become a major contributor to wastewater problem and create a lot of environmental concern. The complete dehairing was achieved with 2000 U/mL rKERDZ for 10 h at 40 °C. In fact, keratinase assisted dehairing entirely degraded chicken feather (45 mg) and removed wool/hair from rabbit, sheep, goat, or bovine' hides (1.6 kg) while preserving the collagen structure. The enzymatic process is the eco-friendly option that reduces biological (BOD) (50%) and chemical (COD) oxygen demands (60%) in leather processing. Consequently, the enzymatic hair removal process could solve the problem of post-treatments encountering the traditional leather processing. The enzymatic (rKERDZ) dehaired leather was analyzed by scanning electron microscopic (SEM) studies, which revealed similar fiber orientation and compactness compared with control sample. Those properties support that the rKERDZ enzyme-mediated process is greener to some extent than the traditional one.
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Affiliation(s)
- Mouna Ben Elhoul
- Laboratory of Microbial Biotechnology, Enzymatic, and Biomolecules (LMBEB), Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, 3018, Sfax, Tunisia
- Biotech ECOZYM Start-up, Business Incubator, Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, 3018, Sfax, Tunisia
| | - Nadia Zaraî Jaouadi
- Laboratory of Microbial Biotechnology, Enzymatic, and Biomolecules (LMBEB), Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, 3018, Sfax, Tunisia
- Biotech ECOZYM Start-up, Business Incubator, Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, 3018, Sfax, Tunisia
| | - Khelifa Bouacem
- Laboratory of Cellular and Molecular Biology (LCMB), Microbiology Team, Faculty of Biological Sciences, University of Sciences and Technology of Houari Boumediene (USTHB), P.O. Box 32, El Alia, Bab Ezzouar, 16111, Algiers, Algeria
| | - Fawzi Allala
- Laboratory of Cellular and Molecular Biology (LCMB), Microbiology Team, Faculty of Biological Sciences, University of Sciences and Technology of Houari Boumediene (USTHB), P.O. Box 32, El Alia, Bab Ezzouar, 16111, Algiers, Algeria
| | - Hatem Rekik
- Laboratory of Microbial Biotechnology, Enzymatic, and Biomolecules (LMBEB), Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, 3018, Sfax, Tunisia
- Biotech ECOZYM Start-up, Business Incubator, Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, 3018, Sfax, Tunisia
| | - Sondes Mechri
- Laboratory of Microbial Biotechnology, Enzymatic, and Biomolecules (LMBEB), Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, 3018, Sfax, Tunisia
| | - Haifa Khemir Ezzine
- National Leather and Shoe Center (CNCC), 17, Road of leather, Z.I. Sidi Rezig, 2033, Ben Arous, Tunisia
| | - Neila Miled
- National Leather and Shoe Center (CNCC), 17, Road of leather, Z.I. Sidi Rezig, 2033, Ben Arous, Tunisia
| | - Bassem Jaouadi
- Laboratory of Microbial Biotechnology, Enzymatic, and Biomolecules (LMBEB), Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, 3018, Sfax, Tunisia.
- Biotech ECOZYM Start-up, Business Incubator, Centre of Biotechnology of Sfax (CBS), University of Sfax, Road of Sidi Mansour Km 6, P.O. Box 1177, 3018, Sfax, Tunisia.
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12
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Insights into substrate specificity of proteases for screening efficient dehairing enzymes. Int J Biol Macromol 2021; 172:360-370. [PMID: 33460659 DOI: 10.1016/j.ijbiomac.2021.01.065] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 01/06/2021] [Accepted: 01/12/2021] [Indexed: 11/22/2022]
Abstract
Though numerous proteases have been isolated and screened for the dehairing purpose, their use in the leather industry is limited mainly due to high cost, the need for expertise, and control during unit operation and alterations in the quality of leather due to lack of the right kind of substrate specificity of the enzymes used. This paper deals with the comparative specificity and dehairing efficiency of proteases isolated from Bacillus cereus VITSP01 (PE2) and Brevibacterium luteolum VITSP02 (PE). PE2 and PE were found to be trypsin-like and elastase-like serine proteases respectively. The protease of VITSP02 degraded the proteoglycans efficiently in comparison to that of VITSP01. The results suggest that the possible targets of the studied proteases might be skin proteoglycans, including those cementing the hair root bulb. Hence, an in-depth study on the substrate specificity of the dehairing proteases would help in designing an improved screening method for isolating potent dehairing enzymes.
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Chen M, Jiang M, Li H, Cheng H. Screening of additives to reduce grain damage risk on unhairing by proteinase K. JOURNAL OF LEATHER SCIENCE AND ENGINEERING 2020. [DOI: 10.1186/s42825-020-00032-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Abstract
Enzymatic unhairing is a cleaner strategy for leather-making. It is a potential alternative to the traditional hair-burning process. However, several shortcomings, such as uncontrolled enzymatic reaction, and risk of grain looseness and damage have restricted the broad application of enzymatic unhairing. In this work, metal ions and organic additives were screened for lessening the hydrolytic activity of proteinase K to collagen fiber. Then, the selected additives were applied to the enzymatic unhairing process for bovine hide. The results showed that a suitable concentration of metal ions (Cu (II), Fe (III) and Al (III)) and organic additives (salicylate, laurate, adipate, gallate and epicatechin (ECG)) could diminish approximately 35% of the hydrolytic activity of proteinase K to collagen fibers. Then, the additives were applied for the bovine hide enzymatic unhairing process. Hydroxyproline determination in the unhairing float shows that applying additives could reduce collagen hydrolysis. The morphology results showed that the grain damage could be significantly reduced with the addition of the screened additives in the proteinase K enzymatic unhairing system, whereas the addition of ECG and gallate significantly slowed down the unhairing speed. This outcome provides new potential to reduce the risk of grain damage in enzymatic unhairing process.
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Zhang RX, Gong JS, Su C, Qin J, Li H, Li H, Shi JS, Xu ZH. Recombinant expression and molecular engineering of the keratinase from Brevibacillus parabrevis for dehairing performance. J Biotechnol 2020; 320:57-65. [PMID: 32569793 DOI: 10.1016/j.jbiotec.2020.06.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Revised: 06/10/2020] [Accepted: 06/18/2020] [Indexed: 12/17/2022]
Abstract
Keratinase is capable of distinctive degradation of keratin, which provides an eco-friendly approach for keratin waste management towards sustainable development. In this study, the recombinant keratinase (KERBP) from Brevibacillus parabrevis was successfully expressed in Escherichia coli. The purified KERBP had the specific activity of 6005.3 U/mg. It showed remarkable tolerance to various surfactants and also no collagenolytic activity. However, the moderate thermal stability limited its further application. Thus, protein engineering was further adopted to improve its stability. The variants of T218S, S236C and N181D were constructed by site-directed mutagenesis and combinatorial mutagenesis. Compared with the wild type, the t1/2 at 60 °C for the variants T218S, S236C and N181D were 3.05-, 1.18- and 1-fold increase, respectively. Moreover, the double variants N181D-T218S and N181D-S236C significantly improved thermostability with 5.1 and 2.9 °C increase of T50, and prolonging t1/2 at 60 °C with 4.09 and 1.54-fold, respectively. And the catalytic efficiency of the T218S and N181D-T218S variants was also significantly improved. Furthermore, the keratinase displayed favorable ability to dehair wool from skin within 7 h, which showed potential in leather dehairing. Our work contributes to a further insight into the thermostability of keratinase and offers a promising alternative for industrial leather application.
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Affiliation(s)
- Rong-Xian Zhang
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Pharmaceutical Sciences, Jiangnan University, Wuxi 214122, PR China; School of Life Science and Technology, Henan Institute of Science and Technology, Xinxiang 453003, PR China
| | - Jin-Song Gong
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Pharmaceutical Sciences, Jiangnan University, Wuxi 214122, PR China
| | - Chang Su
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Pharmaceutical Sciences, Jiangnan University, Wuxi 214122, PR China
| | - Jiufu Qin
- Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark
| | - Heng Li
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Pharmaceutical Sciences, Jiangnan University, Wuxi 214122, PR China
| | - Hui Li
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Pharmaceutical Sciences, Jiangnan University, Wuxi 214122, PR China
| | - Jin-Song Shi
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Pharmaceutical Sciences, Jiangnan University, Wuxi 214122, PR China.
| | - Zheng-Hong Xu
- Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Pharmaceutical Sciences, Jiangnan University, Wuxi 214122, PR China; National Engineering Laboratory for Cereal Fermentation Technology, School of Biotechnology, Jiangnan University, Wuxi 214122, PR China
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Arumugam N, Dhandapani B, Mahadevan S. Optimized production of extracellular alkaline protease from Aspergillus tamarii with natural by-products in a batch stirred tank bioreactor. Prep Biochem Biotechnol 2020; 50:992-999. [PMID: 32538688 DOI: 10.1080/10826068.2020.1777426] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Proteolytic enzymes are one of the significant commercially manufactured enzymes. The manufacture of extracellular alkaline protease by Aspergillus tamarii MTCC5152 was explored using several agricultural by-products as substrates viz., cottonseed meal, wheat bran, skimmed milk and soya flour in submerged fermentation, were found to be efficient for enzyme production and commercially significant. Response surface methodology (RSM) is a statistics-based experimental design, sourced to explore the impact of physical parameters on the manufacture of protease from A. tamarii in a batch stirred tank bioreactor (STBR). The four substantial variables (pH, temperature, inoculum size, and agitation) were carefully chosen for optimization analyses and the statistical pattern was created using a central composite design and the quadratic model has been developed. The optimum conditions for protease production (1.51 U mL-1) where: pH 6.4, temperature 27 °C, inoculum size 2.6%, and agitation 327 rpm. The analysis revealed that the anticipated values were in accord with trial data with a correlation coefficient of 0.969.
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Affiliation(s)
- Nagarajan Arumugam
- Department of Chemical Engineering, SSN College of Engineering, Chennai, India
| | - Balaji Dhandapani
- Department of Chemical Engineering, SSN College of Engineering, Chennai, India
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Luo F, Zhong X, Gao M, Peng B, Long Z. Progress and mechanism of breaking glycoconjugates by glycosidases in skin for promoting unhairing and fiber opening-up in leather manufacture. A review. JOURNAL OF LEATHER SCIENCE AND ENGINEERING 2020. [DOI: 10.1186/s42825-020-00025-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Abstract
The glycoconjugates, herein glyco-proteins, existing in animal skins are closely related to the effectiveness of unhairing and fiber opening-up. Glycosidases have been used in leather making processes to reduce pollutants and improve leather quality. But the selection of glycosidases is still blind because the related mechanisms are not well understood yet. Hence, the animal skin structures and glycoconjugates components, the advances in the methods and mechanisms of removing glycoconjugates related to unhairing and fiber opening-up in leather manufacture, the kinds, compositions, structures and functions of typical glycoconjugates in skin are summarized. Then the approaches to destroy them, possible glycosidases suitable for leather making and their acting sites are analyzed based on the recognition of glycoconjugates in skin and the specificities of glycosidases toward substrates. It is expected to provide useful information for the optimization of glycosidases and the development of new enzymes and the cleaner technologies of unhairing and opening up fiber bundles assisted by glycosidases.
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Errasti ME, Torres MJ, Mercerat JR, Caffini NO, López LMI. Plant proteases from Carica papaya and Vasconcellea quercifolia with potential application for a cleaner processing in tanneries. BIOCATAL BIOTRANSFOR 2020. [DOI: 10.1080/10242422.2020.1751131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- María Eugenia Errasti
- Centro de Investigación de Tecnología del Cuero, CICPBA-INTI, Manuel B. Gonnet, Argentina
- Centro de Investigación de Proteínas Vegetales, Facultad de Ciencias Exactas, Departamento de Ciencias Biológicas, Universidad Nacional de La Plata-CICPBA, La Plata, Argentina
| | - María José Torres
- Centro de Investigaciones y Transferencia del Noroeste de la Provincia de Buenos Aires, UNNOBA-CONICET, Junín, Argentina
| | - Julio Ricardo Mercerat
- Centro de Investigación de Proteínas Vegetales, Facultad de Ciencias Exactas, Departamento de Ciencias Biológicas, Universidad Nacional de La Plata-CICPBA, La Plata, Argentina
| | - Néstor Oscar Caffini
- Centro de Investigación de Proteínas Vegetales, Facultad de Ciencias Exactas, Departamento de Ciencias Biológicas, Universidad Nacional de La Plata-CICPBA, La Plata, Argentina
| | - Laura María Isabel López
- Centro de Investigación de Tecnología del Cuero, CICPBA-INTI, Manuel B. Gonnet, Argentina
- Universidad Nacional Arturo Jauretche, Florencio Varela, Argentina
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Sawalha H, Alsharabaty R, Sarsour S, Al-Jabari M. Wastewater from leather tanning and processing in Palestine: Characterization and management aspects. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 251:109596. [PMID: 31561144 DOI: 10.1016/j.jenvman.2019.109596] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Revised: 09/03/2019] [Accepted: 09/16/2019] [Indexed: 06/10/2023]
Abstract
Leather manufacturing industry has major environmental impacts. Characterization of tannery's wastewater (WW) is a key step in the management of wastewater released from various processes. This study presents some physicochemical characteristics measured in wastewater. It compares the pollution loads released from both goat and cow hides processing. The main pollution characteristics of wastewater released from two local tanneries were determined experimentally, through analyzing real samples of industrial discharges. These include chemical oxygen demand (COD), total solids (TS), total dissolved solids (TDS), total suspended solids (TSS), pH, and the concentrations of chloride, ammonia (NH3) and chromium in both states, Cr (III) and Cr (VI). Characterization of such processes effluents assists in identifying waste generation rates and discharges, and then in recommending cleaner production options. The results shows that the amount of WW produced in the local Palestinian tanneries is much lower than tanneries worldwide, whereas it is more concentrated with pollutants. Liming process has the highest COD and the highest pH value, where tanning process releases WW highly concentrated with chromium. Real process measurements and mass balance calculations indicated that the chromium uptake efficiency is only 46.6%. Such a low efficiency indicates that cleaner production measures are essential in local tanneries.
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Affiliation(s)
- Hassan Sawalha
- Renewable Energy and Environment Research Unit, Mechanical Engineering Department, Palestine Polytechnic University, P.O. Box: 198, Wadi Al-Haria, Hebron, Palestine
| | - Razan Alsharabaty
- Renewable Energy and Environment Research Unit, Mechanical Engineering Department, Palestine Polytechnic University, P.O. Box: 198, Wadi Al-Haria, Hebron, Palestine
| | - Sawsan Sarsour
- Renewable Energy and Environment Research Unit, Mechanical Engineering Department, Palestine Polytechnic University, P.O. Box: 198, Wadi Al-Haria, Hebron, Palestine
| | - Maher Al-Jabari
- Renewable Energy and Environment Research Unit, Mechanical Engineering Department, Palestine Polytechnic University, P.O. Box: 198, Wadi Al-Haria, Hebron, Palestine.
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Enhanced production of alkaline protease by Neocosmospora sp. N1 using custard apple seed powder as inducer and its application for stain removal and dehairing. BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY 2019. [DOI: 10.1016/j.bcab.2019.101310] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Iqbalsyah TM, Malahayati, Atikah, Febriani. Purification and partial characterization of a thermo-halostable protease produced by Geobacillus sp. strain PLS A isolated from undersea fumaroles. JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE 2019. [DOI: 10.1080/16583655.2019.1650489] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Teuku M. Iqbalsyah
- Faculty of Mathematics and Natural Sciences, Chemistry Department, Biomolecules Application Research Group, Universitas Syiah Kuala, Banda Aceh, Indonesia
| | - Malahayati
- Faculty of Mathematics and Natural Sciences, Chemistry Department, Biomolecules Application Research Group, Universitas Syiah Kuala, Banda Aceh, Indonesia
| | - Atikah
- Faculty of Mathematics and Natural Sciences, Chemistry Department, Biomolecules Application Research Group, Universitas Syiah Kuala, Banda Aceh, Indonesia
| | - Febriani
- Faculty of Mathematics and Natural Sciences, Chemistry Department, Biomolecules Application Research Group, Universitas Syiah Kuala, Banda Aceh, Indonesia
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Wang T, Liang C, Sun Y, Gao W, Luo X, Gao Q, Li R, Fu S, Xu H, He T, Yuan H. Strategical isolation of efficient chicken feather-degrading bacterial strains from tea plantation soil sample. Int Microbiol 2018; 22:227-237. [PMID: 30810985 DOI: 10.1007/s10123-018-00042-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 10/24/2018] [Accepted: 10/29/2018] [Indexed: 11/28/2022]
Abstract
Chicken feather waste is generally insufficiently utilized despite its high content of protein, constituting an environmental issue. Biodegradation of the waste with enabling microbes provides an advantageous option among the available solutions. In this study, an efficient whole feather-degrading strain was strategically isolated from a soil sample taken from a local tea plantation that has little or nothing to do with feathers. The strain was identified as Bacillus thuringiensis (designated as FDB-10) according to the cloned complete 16S rRNA sequence. The FDB-10 could efficiently degrade briefly heat-treated whole feather (102 °C, 5 min; up to 90% of a maximum concentration of 30 g/L) in a salt medium supplemented with 0.1 g/L yeast extract within 24 h (37 °C, 150 rpm). Addition of carbon sources (glycerol, glucose, starch, Tween 20, Tween 80, 1.25 g/L as glycerol) to the fermentation medium could improve the degradation. However, significant inhibition could be observed when the added carbon source reached the amount usually adopted in the investigation of carbon source preference (1%). Nitrogen source (NH4Cl, (NH4)2SO4, peptone) adversely influenced the performance of the strain. When the molar concentrations of NH4+ were equal for the two salt, the inhibitory effect on degradation of whole feathers was similar. Entirely different from other reported feather-degrading strains showing a preference to melanin-free feather substrates, the strain isolated in this study could degrade melanin-containing feather equally efficiently, and higher protease activity could be detected in the digest mix. As a plus, the strain could degrade feathers in rice wash produced in daily cooking, indicating its potential use in the simultaneous treatment of rice cooker wastewater produced by a rice processing plant. All these results imply that the FDB-10 is a strain with great potential in the biodegradation of feather waste.
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Affiliation(s)
- Tianwen Wang
- College of Life Sciences, and Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, China.
| | - Chen Liang
- College of Life Sciences, and Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, China
| | - Yan Sun
- College of Life Sciences, and Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, China
| | - Wanru Gao
- College of Life Sciences, and Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, China
| | - Xinqi Luo
- College of Life Sciences, and Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, China
| | - Qian Gao
- College of Life Sciences, and Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, China
| | - Rong Li
- College of Life Sciences, and Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, China
| | - Shuang Fu
- College of Life Sciences, and Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, China
| | - Hongjv Xu
- College of Life Sciences, and Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, China
| | - Ting He
- College of Life Sciences, and Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, China
| | - Hongyu Yuan
- College of Life Sciences, and Institute for Conservation and Utilization of Agro-bioresources in Dabie Mountains, Xinyang Normal University, Xinyang, 464000, China.
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