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Dos Santos CWV, de Souza CB, Da Silva AT, Nascimento JSD, Meireles Grillo LA, Gomes FS, Pereira HJV. Purification and characterization of a new trypsin-like protease from Crotalaria stipularia. Prep Biochem Biotechnol 2023:1-8. [PMID: 38156982 DOI: 10.1080/10826068.2023.2299423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Proteases are the main enzymes traded worldwide-comprising 60% of the total enzyme market-and are fundamental to the degradation and processing of proteins and peptides. Due to their high commercial demand and biological importance, there is a search for alternative sources of these enzymes. Crotalaria stipularia is highlighted for its agroecological applications, including organic fertilizers, nematode combat, and revegetation of areas contaminated with toxic substances. Considering the pronounced biotechnological functionality of the studied species and the necessity to discover alternative sources of proteases, we investigated the extraction, purification, and characterization of a protease from seeds of the C. stipularia plant. Protease isolation was achieved by three-phase partitioning and single-step molecular exclusion chromatography in Sephacryl S-100, with a final recovery of 47% of tryptic activity. The molecular mass of the isolated enzyme was 40 kDa, demonstrating optimal activities at pH 8.0 and 50 °C. Enzymatic characterization demonstrated that the protease can hydrolyze the specific trypsin substrate, BApNA. This trypsin-like protease had a Km, Vmax, Kcat, and catalytic efficiency constant of 0.01775 mg/mL, 0.1082 mM/min, 3.86 s-1, and 217.46, respectively.
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Affiliation(s)
| | - Cledson Barros de Souza
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, A. C. Simões Campus, (UFAL), Maceió, Alagoas, Brazil
| | - Antônio Thomás Da Silva
- Institute of Pharmaceutical Science, Federal University of Alagoas, A. C. Simões Campus, (UFAL), Maceió, Alagoas, Brazil
| | - Josiel Santos do Nascimento
- Institute of Pharmaceutical Science, Federal University of Alagoas, A. C. Simões Campus, (UFAL), Maceió, Alagoas, Brazil
| | | | - Francis Soares Gomes
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, A. C. Simões Campus, (UFAL), Maceió, Alagoas, Brazil
| | - Hugo Juarez Vieira Pereira
- Institute of Chemistry and Biotechnology, Federal University of Alagoas, A. C. Simões Campus, (UFAL), Maceió, Alagoas, Brazil
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Othman AM, Elshafei AM, Elsayed MA, Ibrahim GE, Hassan MM, Mehanna NS. Biochemical characterization and insights into the potency of the acidic Aspergillus niger NRC114 purified α-galactosidase in removing raffinose family oligosaccharides from soymilk yogurt. BMC Biotechnol 2023; 23:3. [PMID: 36721204 PMCID: PMC9887927 DOI: 10.1186/s12896-023-00773-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 01/20/2023] [Indexed: 02/01/2023] Open
Abstract
BACKGROUND Because humans lack α-galactosidase, foods containing certain oligosaccharides from the raffinose family, such as soybeans and other legumes, may disrupt digestion and cause flatulence. RESULTS Aspergillus niger NRC114 α-galactosidase was purified using protein precipitation, gel filtration, and ion exchange chromatography steps, which resulted in a 123-fold purification. The purified enzyme was found to be 64 kDa using the SDS-PAGE approach. The optimum pH and temperature of the purified α-galactosidase were detected at pH 3.5 and 60 ºC, respectively. The pure enzyme exhibited potent acidic pH stability at pH 3.0 and pH 4.0 for 2 h, and it retained its full activity at 50 ºC and 60 ºC for 120 min and 90 min, respectively. The enzyme was activated using 2.5 mM of K+, Mg2+, Co2+, or Zn2+ by 14%, 23%, 28%, and 11%, respectively. The Km and Vmax values of the purified enzyme were calculated to be 0.401 µM and 14.65 μmol min-1, respectively. The soymilk yogurt showed an increase in its total phenolic content and total flavonoids after enzyme treatment, as well as several volatile compounds that were detected and identified using GC-MS analysis. HPLC analysis clarified the enzymatic action in the hydrolysis of raffinose family oligosaccharides. CONCLUSION The findings of this study indicate the importance of A. niger NRC114 α-galactosidase enzyme for future studies, especially its applications in a variety of biological fields.
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Affiliation(s)
- Abdelmageed M. Othman
- grid.419725.c0000 0001 2151 8157Microbial Chemistry Department, Biotechnology Research Institute, National Research Centre, 33 El Bohouth St., Dokki 12622 Giza, Egypt
| | - Ali M. Elshafei
- grid.419725.c0000 0001 2151 8157Microbial Chemistry Department, Biotechnology Research Institute, National Research Centre, 33 El Bohouth St., Dokki 12622 Giza, Egypt
| | - Maysa A. Elsayed
- grid.419725.c0000 0001 2151 8157Microbial Chemistry Department, Biotechnology Research Institute, National Research Centre, 33 El Bohouth St., Dokki 12622 Giza, Egypt
| | - Gamil E. Ibrahim
- grid.419725.c0000 0001 2151 8157Chemistry of Flavor and Aroma Department, Food Industries and Nutrition Research Institute, National Research Centre, 33 El Bohouth St., Dokki 12622 Giza, Egypt
| | - Mohamed M. Hassan
- grid.419725.c0000 0001 2151 8157Microbial Chemistry Department, Biotechnology Research Institute, National Research Centre, 33 El Bohouth St., Dokki 12622 Giza, Egypt
| | - Nayra S. Mehanna
- grid.419725.c0000 0001 2151 8157Dairy Sciences Department, Food Industries and Nutrition Research Institute, National Research Centre, 33 El Bohouth St., Dokki 12622 Giza, Egypt
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Sepabeads EC-EP immobilized α-galactosidase: Immobilization, characterization and application in the degradation of raffinose-type oligosaccharides. Process Biochem 2022. [DOI: 10.1016/j.procbio.2022.02.020] [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: 12/19/2022]
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Purification, biochemical and biophysical characterization of an acidic α-galactosidase from the seeds of Annona squamosa (custard apple). Int J Biol Macromol 2021; 175:558-571. [PMID: 33529636 DOI: 10.1016/j.ijbiomac.2021.01.179] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2020] [Revised: 01/14/2021] [Accepted: 01/28/2021] [Indexed: 02/01/2023]
Abstract
Alpha galactosidase is an exoglycosidase that cleaves α-D-galactose and has numerous applications in medicine, biotechnology, food and pharma industries. In this study, a low molecular weight acidic α-galactosidase was identified from the seeds of custard apple. The purification of α-galactosidase from the crude extract of defatted seeds was achieved by employing ammonium sulphate fractionation, hydrophobic interaction and gel filtration chromatographic techniques. The purified custard apple α-galactosidase (CaG) migrated as a single band in native PAGE corresponding to molecular weight of ~67 kDa and cleaved chromogenic, fluorogenic and natural substrates. CaG was found to be a heterodimer with subunit masses of 40 and 30 kDa. The kinetic parameters such as KM and Vmax were found to be 0.67 mM and 1.5 U/mg respectively with p-nitrophenyl α-D-galactopyranoside. Galactose, methyl α-D-galactopyranoside and D-galacturonic acid inhibited CaG activity in mixed mode. The CD spectral analysis at far UV region showed that purified CaG exists predominantly as helix (35%), beta sheets (16.3%) and random coils (32.3%) in its secondary structure. These biochemical and biophysical properties of CaG provide leads to understand its primary sequence and glycan structures which will eventually define its novel physiological roles in plants and potential industrial applications.
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Patil PD, Yadav GD. Application of microwave assisted three phase partitioning method for purification of laccase from Trametes hirsuta. Process Biochem 2018. [DOI: 10.1016/j.procbio.2017.10.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Effects of α-galactosidase supplementation on nutrient digestibility, growth performance, intestinal morphology and digestive enzyme activities in weaned piglets. Anim Feed Sci Technol 2018. [DOI: 10.1016/j.anifeedsci.2017.11.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Chew KW, Ling TC, Show PL. Recent Developments and Applications of Three-Phase Partitioning for the Recovery of Proteins. SEPARATION AND PURIFICATION REVIEWS 2018. [DOI: 10.1080/15422119.2018.1427596] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Kit Wayne Chew
- Department of Chemical and Environmental Engineering and Bioseparation Research Group, Faculty of Engineering, University of Nottingham Malaysia Campus, Semenyih, Selangor Darul Ehsan 43500, Malaysia
| | - Tau Chuan Ling
- Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Pau Loke Show
- Department of Chemical and Environmental Engineering and Bioseparation Research Group, Faculty of Engineering, University of Nottingham Malaysia Campus, Semenyih, Selangor Darul Ehsan 43500, Malaysia
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Yuzugullu Karakus Y, Acemi A, Işık S, Duman Y. Purification of peroxidase from Amsonia orientalis by three-phase partitioning and its biochemical characterization. SEP SCI TECHNOL 2017. [DOI: 10.1080/01496395.2017.1405990] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
| | - Arda Acemi
- Department of Biology, Faculty of Arts and Sciences, Kocaeli University, Kocaeli, Turkey
| | - Semih Işık
- Department of Biology, Faculty of Arts and Sciences, Kocaeli University, Kocaeli, Turkey
| | - Yonca Duman
- Department of Chemistry, Faculty of Arts and Sciences, Kocaeli University, Kocaeli, Turkey
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Yan JK, Wang YY, Qiu WY, Ma H, Wang ZB, Wu JY. Three-phase partitioning as an elegant and versatile platform applied to nonchromatographic bioseparation processes. Crit Rev Food Sci Nutr 2017; 58:2416-2431. [DOI: 10.1080/10408398.2017.1327418] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
| | | | | | - Haile Ma
- Jiangsu University, Zhenjiang, China
| | | | - Jian-Yong Wu
- The Hong Kong Polytechnic University, Department of Applied Biology & Chemical Technology, State Key Laboratory of Chinese Medicine and Molecular Pharmacology in Shenzhen, Hung Hom, Kowloon, Hong Kong
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Nadar SS, Pawar RG, Rathod VK. Recent advances in enzyme extraction strategies: A comprehensive review. Int J Biol Macromol 2017; 101:931-957. [DOI: 10.1016/j.ijbiomac.2017.03.055] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Revised: 03/07/2017] [Accepted: 03/10/2017] [Indexed: 12/19/2022]
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11
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Hu Y, Tian G, Zhao L, Wang H, Ng TB. A protease-resistant α-galactosidase from Pleurotus djamor with broad pH stability and good hydrolytic activity toward raffinose family oligosaccharides. Int J Biol Macromol 2017; 94:122-130. [DOI: 10.1016/j.ijbiomac.2016.10.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Revised: 09/28/2016] [Accepted: 10/03/2016] [Indexed: 11/29/2022]
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12
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Extraction of Oil from Flaxseed (Linum usitatissimum L.) Using Enzyme-Assisted Three-Phase Partitioning. Appl Biochem Biotechnol 2016; 179:1325-35. [DOI: 10.1007/s12010-016-2068-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 03/29/2016] [Indexed: 11/26/2022]
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13
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Hu Y, Tian G, Geng X, Zhang W, Zhao L, Wang H, Ng TB. A protease-resistant α-galactosidase from Pleurotus citrinopileatus with broad substrate specificity and good hydrolytic activity on raffinose family oligosaccharides. Process Biochem 2016. [DOI: 10.1016/j.procbio.2016.01.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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14
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Waghmare AG, Salve MK, LeBlanc JG, Arya SS. Concentration and characterization of microalgae proteins from Chlorella pyrenoidosa. BIORESOUR BIOPROCESS 2016. [DOI: 10.1186/s40643-016-0094-8] [Citation(s) in RCA: 108] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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Niphadkar SS, Rathod VK. Ultrasound-assisted three-phase partitioning of polyphenol oxidase from potato peel (Solanum tuberosum). Biotechnol Prog 2015; 31:1340-7. [DOI: 10.1002/btpr.2139] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2014] [Revised: 05/06/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Sonali S. Niphadkar
- Dept. of Chemical Engineering; Institute of Chemical Technology; N.P. Marg, Matunga (E) Mumbai 400019 India
| | - Virendra K. Rathod
- Dept. of Chemical Engineering; Institute of Chemical Technology; N.P. Marg, Matunga (E) Mumbai 400019 India
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Vetal MD, Rathod VK. Three phase partitioning a novel technique for purification of peroxidase from orange peels (Citrus sinenses). FOOD AND BIOPRODUCTS PROCESSING 2015. [DOI: 10.1016/j.fbp.2014.03.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Shanmugaprakash M, Jayashree C, Vinothkumar V, Senthilkumar S, Siddiqui S, Rawat V, Arshad M. Biochemical characterization and antitumor activity of three phase partitioned l-asparaginase from Capsicum annuum L. Sep Purif Technol 2015. [DOI: 10.1016/j.seppur.2014.12.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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18
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Vetal MD, Shirpurkar ND, Rathod VK. Three phase partitioning coupled with ultrasound for the extraction of ursolic acid and oleanolic acid from Ocimum sanctum. FOOD AND BIOPRODUCTS PROCESSING 2014. [DOI: 10.1016/j.fbp.2013.09.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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19
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Ketnawa S, Benjakul S, Martínez-Alvarez O, Rawdkuen S. Three-phase partitioning and proteins hydrolysis patterns of alkaline proteases derived from fish viscera. Sep Purif Technol 2014. [DOI: 10.1016/j.seppur.2014.05.006] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Avhad DN, Niphadkar SS, Rathod VK. Ultrasound assisted three phase partitioning of a fibrinolytic enzyme. ULTRASONICS SONOCHEMISTRY 2014; 21:628-33. [PMID: 24184008 DOI: 10.1016/j.ultsonch.2013.10.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2013] [Revised: 09/18/2013] [Accepted: 10/02/2013] [Indexed: 05/24/2023]
Abstract
The present investigation is aimed at ultrasound assisted three phase partitioning (UATPP) of a fibrinolytic enzyme from Bacillus sphaericus MTCC 3672. Three phase partitioning integrates the concentration and partial purification step of downstream processing of a biomolecule. Three phase system is formed with simultaneous addition of ammonium sulfate to crude broth and followed by t-butanol. UATPP of a fibrinolytic enzyme was studied by varying different process parameters such as ammonium sulfate saturation concentration, pH, broth to t-butanol ratio, temperature, ultrasound frequency, ultrasonication power, and duty cycle. The optimized parameters yielding maximum purity of 16.15-fold of fibrinolytic enzyme with 65% recovery comprised of 80% ammonium sulfate saturation, pH 9, temperature 30 °C, broth to t-butanol ratio 0.5 (v/v), at 25 kHz frequency and 150 W ultrasonication power with 40% duty cycle for 5 min irradiation time. SDS PAGE analysis of partitioned enzyme shows partial purification with a molecular weight in the range of 55-70 kDa. Enhanced mass transfer of UATPP resulted in higher fold purity of fibrinolytic enzyme with reduced time of operation from 1 h to 5 min as compared to conventional TPP. Outcome of our findings highlighted the use of UATPP as an efficient biosepartion technique.
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Affiliation(s)
- Devchand N Avhad
- Department of Chemical Engineering, Institute of Chemical Technology, Matunga (E), Mumbai 400019, India
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Bayraktar H, Önal S. Concentration and purification of α-galactosidase from watermelon (Citrullus vulgaris) by three phase partitioning. Sep Purif Technol 2013. [DOI: 10.1016/j.seppur.2013.08.040] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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Duman Y(A, Kaya E. Purification, recovery, and characterization of chick pea (Cicer arietinum) β-galactosidase in single step by three phase partitioning as a rapid and easy technique. Protein Expr Purif 2013; 91:155-60. [DOI: 10.1016/j.pep.2013.08.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 07/16/2013] [Accepted: 08/03/2013] [Indexed: 10/26/2022]
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Choonia HS, Lele S. Three phase partitioning of β-galactosidase produced by an indigenous Lactobacillus acidophilus isolate. Sep Purif Technol 2013. [DOI: 10.1016/j.seppur.2013.02.033] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Three-phase partitioning as a rapid and easy method for the purification and recovery of catalase from sweet potato tubers (Solanum tuberosum). Appl Biochem Biotechnol 2013; 170:1119-26. [PMID: 23640263 DOI: 10.1007/s12010-013-0260-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 04/21/2013] [Indexed: 10/26/2022]
Abstract
Three-phase partitioning (TPP) was used to purify and recover catalase from potato crude extract. The method consists of ammonium sulfate saturation, t-butanol addition, and adjustment of pH, respectively. The best catalase recovery (262 %) and 14.1-fold purification were seen in the interfacial phase in the presence of 40 % (w/v) ammonium sulfate saturation with 1.0:1.0 crude extract/t-butanol ratio (v/v) at pH 7 in a single step. The sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) analysis of the enzyme showed comparatively purification and protein molecular weight was nearly found to be 56 kDa. This study shows that TPP is a simple, economical, and quick method for the recovering of catalase and can be used for the purification process.
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Recovery of proteases from the viscera of farmed giant catfish (Pangasianodon gigas) by three-phase partitioning. Process Biochem 2012. [DOI: 10.1016/j.procbio.2012.09.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Cray JA, Russell JT, Timson DJ, Singhal RS, Hallsworth JE. A universal measure of chaotropicity and kosmotropicity. Environ Microbiol 2012; 15:287-96. [DOI: 10.1111/1462-2920.12018] [Citation(s) in RCA: 138] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2012] [Accepted: 10/02/2012] [Indexed: 11/28/2022]
Affiliation(s)
- Jonathan A. Cray
- School of Biological Sciences; MBC; Queen's University Belfast; Belfast; BT9 7BL; UK
| | - John T. Russell
- School of Biological Sciences; MBC; Queen's University Belfast; Belfast; BT9 7BL; UK
| | - David J. Timson
- School of Biological Sciences; MBC; Queen's University Belfast; Belfast; BT9 7BL; UK
| | - Rekha S. Singhal
- Department of Food Engineering and Technology; Institute of Chemical Technology; Matunga; Mumbai; 400 019; India
| | - John E. Hallsworth
- School of Biological Sciences; MBC; Queen's University Belfast; Belfast; BT9 7BL; UK
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Harde SM, Singhal RS. Extraction of forskolin from Coleus forskohlii roots using three phase partitioning. Sep Purif Technol 2012. [DOI: 10.1016/j.seppur.2012.05.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Singh N, Kayastha AM. Purification and characterization of α-galactosidase from white chickpea (Cicer arietinum). JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:3253-3259. [PMID: 22385353 DOI: 10.1021/jf204538m] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Glycosylated α-galactosidase (melibiase) has been purified from white chickpea ( Cicer arietinum ) to 340-fold with a specific activity of 61 units/mg. Cicer α-galactosidase showed a M(r) of 45 kDa on SDS-PAGE and by MALDI-TOF. The optimum pH and temperature with pNPGal were 4.5 and 50 °C, respectively. The K(m) for hydrolysis of pNPGal was 0.70 mM. Besides hydrolyzing the pNPGal, Cicer α-galactosidase also hydrolyzed natural substrates such as melibiose, raffinose, and stachyose very effectively; hence, it can be exploited commercially for improving the nutritional value of soy milk. Galactose was found to be a competitive inhibitor. The property of this enzyme to cleave the terminal galactose residues can be utilized for converting the group B erythrocytes to group O erythrocytes.
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Affiliation(s)
- Neelesh Singh
- School of Biotechnology, Faculty of Science, Banaras Hindu University, Varanasi 221005, India
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