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Sulfate removal by barium-terephthalate MOF synthesized from recycled PET-waste using Doehlert design optimization. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109388] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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2
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Adetunji AI, Olaniran AO. Production strategies and biotechnological relevance of microbial lipases: a review. Braz J Microbiol 2021; 52:1257-1269. [PMID: 33904151 PMCID: PMC8324693 DOI: 10.1007/s42770-021-00503-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Accepted: 04/16/2021] [Indexed: 01/14/2023] Open
Abstract
Lipases are enzymes that catalyze the breakdown of lipids into long-chain fatty acids and glycerol in oil-water interface. In addition, they catalyze broad spectrum of bioconversion reactions including esterification, inter-esterification, among others in non-aqueous and micro-aqueous milieu. Lipases are universally produced from plants, animals, and microorganisms. However, lipases from microbial origin are mostly preferred owing to their lower production costs, ease of genetic manipulation etc. The secretion of these biocatalysts by microorganisms is influenced by nutritional and physicochemical parameters. Optimization of the bioprocess parameters enhanced lipase production. In addition, microbial lipases have gained intensified attention for a wide range of applications in food, detergent, and cosmetics industries as well as in environmental bioremediation. This review provides insights into strategies for production of microbial lipases for potential biotechnological applications.
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Affiliation(s)
- Adegoke Isiaka Adetunji
- Discipline of Microbiology, School of Life Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-Natal (Westville campus), Private Bag X54001, Durban, 4000, Republic of South Africa.
| | - Ademola Olufolahan Olaniran
- Discipline of Microbiology, School of Life Sciences, College of Agriculture, Engineering and Science, University of KwaZulu-Natal (Westville campus), Private Bag X54001, Durban, 4000, Republic of South Africa
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Zhang W, Wei L, Xu R, Lin G, Xin H, Lv Z, Qian H, Shi H. Evaluation of the Antibacterial Material Production in the Fermentation of Bacillus amyloliquefaciens-9 from Whitespotted Bamboo Shark ( Chiloscyllium plagiosum). Mar Drugs 2020; 18:md18020119. [PMID: 32085415 PMCID: PMC7073760 DOI: 10.3390/md18020119] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 02/05/2020] [Accepted: 02/13/2020] [Indexed: 12/30/2022] Open
Abstract
Bacillus amyloliquefaciens-9 (GBacillus-9), which is isolated from the intestinal tract of the white-spotted bamboo shark (Chiloscyllium plagiosum), can secrete potential antibacterial materials, such as β-1,3-1,4-glucanase and some antimicrobial peptides. However, the low fermentation production has hindered the development of GBacillus-9 as biological additives. In this study, the Plackett–Burman design and response surface methodology were used to optimize the fermentation conditions in a shake flask to obtain a higher yield and antibacterial activity of GBacillus-9. On the basis of the data from medium screening, M9 medium was selected as the basic medium for fermentation. The data from the single-factor experiment showed that sucrose had the highest antibacterial activity among the 10 carbon sources. The Plackett–Burman design identified sucrose, NH4Cl, and MgSO4 as the major variables altering antibacterial activity. The optimal concentrations of these compounds to enhance antibacterial activity were assessed using the central composite design. Data showed that sucrose, NH4Cl, and MgSO4 had the highest antibacterial activities at concentrations of 64.8, 1.84, and 0.08 g L−1, respectively. The data also showed that the optimal fermentation conditions for the antibacterial material production of GBacillus-9 were as follows: Inoculum volume of 5%, initial pH of 7.0, temperature of 36 °C, rotating speed of 180 rpm, and fermentation time of 10 h. The optimal fermentation medium and conditions achieved to improve the yield of antibacterial materials for GBacillus-9 can enhance the process of developing biological additives derived from GBacillus-9.
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Affiliation(s)
- Wenjie Zhang
- Zhejiang provincial key Laboratory of Silkworm Bioreactor and Biomedicine, College of Life Sciences and medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Ling Wei
- Zhejiang provincial key Laboratory of Silkworm Bioreactor and Biomedicine, College of Life Sciences and medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Rong Xu
- Zhejiang provincial key Laboratory of Silkworm Bioreactor and Biomedicine, College of Life Sciences and medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Guodong Lin
- Zhejiang provincial key Laboratory of Silkworm Bioreactor and Biomedicine, College of Life Sciences and medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Huijie Xin
- Zhejiang provincial key Laboratory of Silkworm Bioreactor and Biomedicine, College of Life Sciences and medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Zhengbing Lv
- Zhejiang provincial key Laboratory of Silkworm Bioreactor and Biomedicine, College of Life Sciences and medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Hong Qian
- Zhejiang provincial key Laboratory of Silkworm Bioreactor and Biomedicine, College of Life Sciences and medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
- Correspondence: (H.Q.); (H.S.); Tel.: +86-571-8898-1341 (H.S.)
| | - Hengbo Shi
- Zhejiang provincial key Laboratory of Silkworm Bioreactor and Biomedicine, College of Life Sciences and medicine, Zhejiang Sci-Tech University, Hangzhou 310018, China
- College of Animal Science, Zhejiang University, Hangzhou 310015, China
- Correspondence: (H.Q.); (H.S.); Tel.: +86-571-8898-1341 (H.S.)
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Moss AF, Chrystal PV, Dersjant-Li Y, Liu SY, Selle PH. The ranked importance of dietary factors influencing the performance of broiler chickens offered phytase-supplemented diets by the Plackett-Burman screening design. Br Poult Sci 2019; 60:439-448. [PMID: 30966791 DOI: 10.1080/00071668.2019.1605154] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
1.The objective of the present study was to rank the importance of the following dietary factors; canola meal, wheat, whole barley, digestible lysine, phytate-P, calcium, available P, sodium and three NSP-degrading feed enzymes. Their influence on growth performance, gastro-intestinal tract parameters, energy utilisation, ileal N digestibility and disappearance rates were determined via the Plackett-Burman design in broiler chickens offered phytase-supplemented diets. 2. The eleven dietary factors were assigned two levels in the Plackett-Burman design matrix. The resulting twelve dietary treatments were offered to six replicates per treatment (six birds per cage) with a total of 468 male Ross 308 broiler chicks from 7 to 28 d post-hatch. 3. Increasing digestible lysine levels improved weight gain by 15.6% (P < 0.001) and gain:feed by 9.36% (P < 0.001). Increasing calcium levels reduced weight gain by 6.36% (P < 0.001) and gain:feed by 2.60% (P < 0.001). The high calcium level increased gizzard pH from 2.78 to 3.01 (P < 0.005). Whole barley significantly increased relative gizzard weights and contents, pancreas weights and both ileal N digestibility coefficients (0.774 versus 0.803; P < 0.001) and ileal N disappearance rates (23. 3 versus 24.5 g/bird/day; P < 0.001). 4. Overall, digestible lysine level and calcium level were identified as the most influential dietary factors to influence growth performance of broilers offered phytase-supplemented diets, which hold implications for practical diet formulations.
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Affiliation(s)
- A F Moss
- a Poultry Research Foundation within The University of Sydney , Camden , Australia
| | - P V Chrystal
- b Baiada Poultry Pty Limited , Pendle Hill , Australia
| | - Y Dersjant-Li
- c Danisco Animal Nutrition, DuPont Industrial Biosciences , Marlborough , UK
| | - S Y Liu
- a Poultry Research Foundation within The University of Sydney , Camden , Australia
| | - P H Selle
- a Poultry Research Foundation within The University of Sydney , Camden , Australia
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Sombutsuwan P, Nakornsadet A, Aryusuk K, Akepratumchai S, Jeyashoke N, Lilitchan S, Krisnangkura K. Recovery of γ-Oryzanol from Rice Bran Acid Oil by an Acid-base Extraction Method with the Assistance of Response Surface Methodology. J Oleo Sci 2018; 67:1405-1415. [PMID: 30404961 DOI: 10.5650/jos.ess18073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
A rapid and low energy consumption method for the recovery of γ-oryzanol from rice bran acid oil (RBAO), a byproduct of rice bran oil (RBO) refining, is presented. The RBAO was converted to the fatty acid ethyl ester (FAEE) and was used as the starting material. The dissolved γ-oryzanol was separated from the FAEE using an acid-base extraction method with alkaline aqueous ethanol and hexane as extraction media. A systematic investigation of the extraction yield was carried out by applying response surface methodology (RSM) based on central composite design (CCD) and Derringer's desirability function. The concentration of NaOH, the percentage of ethanol in water, the hexane content and their interactions showed significant effects on the yield of γ-oryzanol and FAEE. The optimal extraction conditions were as follows: extraction time of 1 min at room temperature (28-32°C); extraction medium: 1.855 M NaOH; 75.91% ethanol in water and 20.59% hexane in the total volume of the extractant; and FAEE to extractant ratio of 1:10 corresponding to a maximum γ-oryzanol yield of 75.82±3.44% and the desired FAEE yield of 54.42±7.80%. The γ-oryzanol-rich fraction was further purified by washing with a 2% Na2CO3 solution, obtaining 69.94% recovery yield with 89.90% purity of γ-oryzanol. The purified γ-oryzanol showed good scavenging activity on the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical and the ABTS radical and was comparable to the commercial product, clearly suggesting that the presented process was efficient and feasible.
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Affiliation(s)
- Piraporn Sombutsuwan
- Division of Biochemical Technology, School of Bioresources and Technology, King Mongkut's University of Technology
| | - Akkaradech Nakornsadet
- Division of Biochemical Technology, School of Bioresources and Technology, King Mongkut's University of Technology
| | - Kornkanok Aryusuk
- Division of Biochemical Technology, School of Bioresources and Technology, King Mongkut's University of Technology
| | - Saengchai Akepratumchai
- Division of Biotechnology, School of Bioresources and Technology, King Mongkut's University of Technology
| | - Narumon Jeyashoke
- Division of Biochemical Technology, School of Bioresources and Technology, King Mongkut's University of Technology
| | | | - Kanit Krisnangkura
- Division of Biochemical Technology, School of Bioresources and Technology, King Mongkut's University of Technology
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de Sena AR, Campos Leite TC, Evaristo da Silva Nascimento TC, Silva ACD, Souza CS, Vaz AFDM, Moreira KA, de Assis SA. Kinetic, thermodynamic parameters and in vitro digestion of tannase from Aspergillus tamarii URM 7115. CHEM ENG COMMUN 2018. [DOI: 10.1080/00986445.2018.1452201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Amanda Reges de Sena
- Microbiology Laboratory, Federal Institute of Education, Science and Technology of Pernambuco, Barreiros, Pernambuco, Brazil
| | - Tonny Cley Campos Leite
- Microbiology Laboratory, Federal Institute of Education, Science and Technology of Pernambuco, Barreiros, Pernambuco, Brazil
| | | | - Anna Carolina da Silva
- Central Laboratory of Garanhuns, Laboratory of Biotechnology, Academic Unit of Garanhuns, Federal Rural University of Pernambuco, Garanhuns, Pernambuco, Brazil
| | - Catiane S. Souza
- Laboratory of Enzymology, Department of Health, State University of Feira de Santana, Feira de Santana, Bahia, Brazil
| | | | - Keila Aparecida Moreira
- Central Laboratory of Garanhuns, Laboratory of Biotechnology, Academic Unit of Garanhuns, Federal Rural University of Pernambuco, Garanhuns, Pernambuco, Brazil
| | - Sandra Aparecida de Assis
- Laboratory of Enzymology, Department of Health, State University of Feira de Santana, Feira de Santana, Bahia, Brazil
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Zhao H, Vegi A, Wolf-Hall C. Screening of Lactic Acid Bacteria for Anti-Fusarium Activity and Optimization of Incubation Conditions. J Food Prot 2017; 80:1648-1656. [PMID: 28853625 DOI: 10.4315/0362-028x.jfp-17-100] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Anti-Fusarium activities of lactic acid bacteria (LAB) Lactobacillus plantarum 299V, L. plantarum NRRL-4496, and Lactobacillus rhamnosus VT1 were determined by a microdilution assay developed in this study against Fusarium graminearum 08/RG/BF/51. A cell-free Lactobacillus culture supernatant (CFLCS) of L. rhamnosus VT1 had the highest anti-Fusarium activity. Response surface methodology was used to optimize the incubation conditions for production of CFLCS. A Box-Behnken factorial design was used to investigate the effects of incubation time, shaking speed, and incubation temperature on the inhibition rate of CFLCS. A model equation was generated to predict the inhibition rate of CFLCS under various incubation conditions. A low probability value (0.0012) and associated F value of 25.10 suggested that the model was highly significant. A high R2 value (0.978) indicated a very satisfactory model performance. Response surface methodology analysis suggested that an incubation temperature at 34°C, a shaking speed at 170 rpm, and an incubation time of 55 h were the best combination for production of CFLCS from L. rhamnosus VT1. Under these incubation conditions, a 10% L. rhamnosus VT1 CFLCS solution was predicted to inhibit the growth of F. graminearum by 75.6% in vitro and inhibited 83.7% of the growth in the validation experiment. Thus, the CFLCS of L. rhamnosus VT1 was an effective anti-Fusarium mixture.
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Affiliation(s)
- Hui Zhao
- 1 Great Plains Institute of Food Safety, North Dakota State University, Fargo, North Dakota 58105, USA
| | - Anuradha Vegi
- 1 Great Plains Institute of Food Safety, North Dakota State University, Fargo, North Dakota 58105, USA.,2 Department of Plant Sciences, Cereal and Food Science Program, North Dakota State University, Fargo, North Dakota 58105, USA
| | - Charlene Wolf-Hall
- 1 Great Plains Institute of Food Safety, North Dakota State University, Fargo, North Dakota 58105, USA.,3 Department of Microbiological Sciences, North Dakota State University, Fargo, North Dakota 58105, USA (ORCID: http://orcid.org/0000-0001-9560-9748 [H.Z.])
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Walia A, Mehta P, Guleria S, Shirkot CK. Improvement for enhanced xylanase production by Cellulosimicrobium cellulans CKMX1 using central composite design of response surface methodology. 3 Biotech 2015; 5:1053-1066. [PMID: 28324413 PMCID: PMC4624141 DOI: 10.1007/s13205-015-0309-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 05/12/2015] [Indexed: 11/24/2022] Open
Abstract
The effects of yeast extract (X1), NH4NO3 (X2), peptone (X3), urea (X4), CMC (X5), Tween 20 (X6), MgSO4 (X7), and CaCO3 (X8) on production of xylanase from Cellulosimicrobium cellulans CKMX1 were optimized by statistical analysis using response surface methodology (RSM). The RSM was used to optimize xylanase production by implementing the Central composite design. Statistical analysis of the results showed that the linear, interaction and quadric terms of these variables had significant effects. However, only the linear effect of X4, X5, interaction effect of X1X7, X1X8, X2X3, X2X8, X3X6, X3X8, X4X6, X4X7, X5X7, X5X8 and quadratic effect of X 32 , X 52 and X 72 found to be insignificant terms in the quadratic model and had no response at significant level. The minimum and maximum xylanase production obtained was 331.50 U/g DBP and 1027.65 U/g DBP, respectively. The highest xylanase activity was obtained from Run No. 30, which consisted of yeast extract (X1), 1.00 g (%); NH4NO3 (X2), 0.20 g (%); peptone (X3), 1.00 g (%); urea (X4), 10 mg (%); CMC (X5), 1.00 g (%); Tween 20 (X6), 0.02 mL (%); CaCO3 (X7), 0.50 g (%) and MgSO4 (X8), 9.0 g (%). The optimization resulted in 3.1-fold increase of xylanase production, compared with the lowest xylanase production of 331.50 U/g DBP after 72 h of incubation in stationary flask experiment. Application of cellulase-free xylanase in pulp biobleaching from C. cellulans CKMX1 under C-EP-D sequence has been shown to bring about a 12.5 % reduction of chlorine, decrease of 0.8 kappa points (40 %), and gain in brightness was 1.42 % ISO points in 0.5 % enzyme treated pulp as compared to control.
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Affiliation(s)
- Abhishek Walia
- />Department of Microbiology, DAV University, Jalandhar, 144001 Punjab India
| | - Preeti Mehta
- />Centre for Advance Bioenergy Research, Research & Development Centre, Indian Oil Corporation Limited, Sector-13, Faridabad, 121 007 India
| | - Shiwani Guleria
- />Department of Basic Sciences, Dr. Y. S. Parmar University of Horticulture and Forestry, Nauni, Solan, 173230 Himachal Pradesh India
| | - Chand Karan Shirkot
- />Department of Basic Sciences, Dr. Y. S. Parmar University of Horticulture and Forestry, Nauni, Solan, 173230 Himachal Pradesh India
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Quan Y, Wang L, Liu Y, Cong J, Xie S, Wu X. Optimization of Fermentation Medium for Glycyrrhizin Biotransformation to Monoglucuronyl-glycyrrhetinic Acid by Plackett-Burman and Box-Behnken Design. KOREAN CHEMICAL ENGINEERING RESEARCH 2015. [DOI: 10.9713/kcer.2015.53.3.321] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Statistical Optimization of Crude Oil Biodegradation by Marinobacter sp. Isolated from Qeshm Island, Iran. IRANIAN JOURNAL OF BIOTECHNOLOGY 2014. [DOI: 10.5812/ijb.15392] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Elnashar MMM, Wahba MI, Amin MA, Eldiwany AI. Application of Plackett-Burman screening design to the modeling of grafted alginate-carrageenan beads for the immobilization of penicillin G acylase. J Appl Polym Sci 2013. [DOI: 10.1002/app.40295] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Magdy M. M. Elnashar
- Polymers Department; National Research Center; El-Behooth Street Dokki Cairo Egypt
- Centre of Scientific Excellence, Group of Biopolymers and Nanobiotechnology; National Research Center; Cairo Egypt
- College of Medicine; Taif University; Hawiya Taif Kingdom of Saudi Arabia
| | - Marwa I. Wahba
- Centre of Scientific Excellence, Group of Biopolymers and Nanobiotechnology; National Research Center; Cairo Egypt
- Department of Natural and Microbial Chemistry; National Research Center; El-Behooth Street Dokki Cairo Egypt
| | - Magdy A. Amin
- Microbiology Department; Faculty of Pharmacy; Cairo University
| | - Ahmed I. Eldiwany
- Department of Natural and Microbial Chemistry; National Research Center; El-Behooth Street Dokki Cairo Egypt
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Zachariadis GA, Rosenberg E. Use of modified Doehlert-type experimental design in optimization of a hybrid electrospray ionization ion trap time-of-flight mass spectrometry technique for glutathione determination. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2013; 27:489-499. [PMID: 23280982 DOI: 10.1002/rcm.6475] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Revised: 11/18/2012] [Accepted: 11/19/2012] [Indexed: 06/01/2023]
Abstract
RATIONALE The capabilities of modified non-spherical Doehlert-type experimental designs to optimize the performance of a hybrid mass spectrometer were investigated in this paper for the first time. The optimization process was completed in three successive steps with groups of variables avoiding any univariable approach. Glutathione (GSH, reduced) was selected as a very interesting analyte since it is considered to be one of the most abundant tripeptides in human organism and its action against xenobiotics and oxidative radicals is well known. METHODS In particular, a tandem technique based on sequential ion management by an ion trap followed by a time-of-flight mass analyzer (ITTOFMS) was introduced commercially in recent years and investigated for glutathione determination. Glutathione was injected in a stream of a typical mobile phase used in liquid chromatography (LC) and analyzed after electrospray ionization (ESI) in tandem MS. RESULTS The three main steps of the LC/MS system, namely the LC mobile phase, the ESI interface and the MS analyzer, were independently optimized in terms of maximum sensitivity. In this context quadratic models were found and their prediction power was evaluated. A calibration study was performed at default and optimum conditions in order to quantitatively estimate the sensitivity enhancement of the employed technique for this analyte. Satisfactory precision (RSD 5.7%) and detectability (LOD 0.07 µmol L(-1) ) were achieved. CONCLUSIONS The results highlighted the possibilities offered by the employment of multifactorial optimization towards the improvement of performance of tandem mass spectrometry techniques.
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Affiliation(s)
- George A Zachariadis
- Laboratory of Analytical Chemistry, Department of Chemistry, Aristotle University, 54124, Thessaloniki, Greece
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LUO J, LIN W, CAI X, LI J. Optimization of Fermentation Media for Enhancing Nitrite-oxidizing Activity by Artificial Neural Network Coupling Genetic Algorithm. Chin J Chem Eng 2012. [DOI: 10.1016/s1004-9541(12)60423-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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14
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Wu CF, Xu XM, Huang SH, Deng MC, Feng AJ, Peng J, Yuan JP, Wang JH. An efficient fermentation method for the degradation of cyanogenic glycosides in flaxseed. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2012; 29:1085-91. [DOI: 10.1080/19440049.2012.680202] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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15
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Han SJ, Park H, Lee SG, Lee HK, Yim JH. Optimization of cold-active chitinase production from the Antarctic bacterium, Sanguibacter antarcticus KOPRI 21702. Appl Microbiol Biotechnol 2010; 89:613-21. [DOI: 10.1007/s00253-010-2890-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2010] [Revised: 09/14/2010] [Accepted: 09/15/2010] [Indexed: 11/30/2022]
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16
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Production of mycelial biomass and exo-polymer by Hericium erinaceus CZ-2: Optimization of nutrients levels using response surface methodology. BIOTECHNOL BIOPROC E 2010. [DOI: 10.1007/s12257-009-0117-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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17
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Wu CF, Xu Y, Tao Y, Yang JY. Establishment of hypoglycemic agent screening method based on human glucokinase. BIOMEDICAL AND ENVIRONMENTAL SCIENCES : BES 2009; 22:62-69. [PMID: 19462690 DOI: 10.1016/s0895-3988(09)60024-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
OBJECTIVE To establish a reliable platform for screening glucokinase activators (GKAs) in vitro. METHODS Pancreatic glucokinase (PGK) protein expressed in a prokaryotic expression system as a histidine-tagged fusion protein from Homo sapiens was produced. Then, response surface methodology (RSM) was used to optimize the microplate-based GKA screening platform. In the first step of optimization with Plackett-Burman design (PBD), initial pH, reaction time and MgCl2 were found to be important factors affecting the activity ratio of GKA (RO-28-1675) significantly. In the second step, a 2(3) full factorial central composite design (CCD) and RSM were applied to the optimal condition determination of each significant variable. A second-order polynomial was determined by a multiple regression analysis of the experimental data. RESULTS The following optimal values for the critical factors were obtained: initial pH 0 (7.0), reaction time-0.63 (13.7 min) and MgCl2 0.11 (2.11 mmol/L) with a predicted value of the maximum activity ratio of 34.1%. CONCLUSION Under the optimal conditions, the practical activity ratio is 34.8%. The determination coefficient (R2) is 0.9442, ensuring adequate credibility of the model. LLAE3, extracted from Folium nelumbinis in our laboratory, has prominently activated effects on PGK.
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Affiliation(s)
- Chou-Fei Wu
- Key Laboratory of State Food Science and Technology, Jiangxi-OAI Joint Research Institute, Nanchang University, Nanchang 330047, Jiangxi, China
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Liu Z, Li Y, Cui F, Ping L, Song J, Ravee Y, Jin L, Xue Y, Xu J, Li G, Wang Y, Zheng Y. Production of octenyl succinic anhydride-modified waxy corn starch and its characterization. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2008; 56:11499-11506. [PMID: 19007235 DOI: 10.1021/jf802317q] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The objective of this work is to investigate the effects of reaction conditions on the synthesis of octenyl succinic anhydride (OSA)-modified starch from waxy corn starch and to study the characteristics of the OSA-modified starch as well as its applications. A mathematical model was developed to investigate the influences of various processing condition factors on the production of the OSA-modified waxy corn starch production and predict the optimum reaction conditions. The maximal degree of substitution (DS) of OSA-modified waxy corn starch (0.0204) was predicted to occur when the starch concentration was 31.2%, the pH was 8.6, the reaction temperature was 33.6 degrees C, and the reaction time was 18.7 h. Repeated reactions for producing OSA-modified waxy corn starch were carried out in a 5 m(3) reactor under the optimized conditions for verification of the model. The characteristics of modified waxy corn starch including infrared spectrum, scanning electron microscopy, and pasting property were tested and emulsification capacity of the OSA-modified starch were evaluated as well.
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Affiliation(s)
- Zhiqiang Liu
- Institute of Bioengineering, Zhejiang University of Technology, Hangzhou, People's Republic of China.
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Xu YX, Li YL, Xu SC, Liu Y, Wang X, Tang JW. Improvement of xylanase production by Aspergillus niger XY-1 using response surface methodology for optimizing the medium composition. J Zhejiang Univ Sci B 2008; 9:558-66. [PMID: 18600786 DOI: 10.1631/jzus.b0820038] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE To study the optimal medium composition for xylanase production by Aspergillus niger XY-1 in solid-state fermentation (SSF). METHODS Statistical methodology including the Plackett-Burman design (PBD) and the central composite design (CCD) was employed to investigate the individual crucial component of the medium that significantly affected the enzyme yield. RESULTS Firstly, NaNO(3), yeast extract, urea, Na(2)CO(3), MgSO(4), peptone and (NH(4))(2)SO(4) were screened as the significant factors positively affecting the xylanase production by PBD. Secondly, by valuating the nitrogen sources effect, urea was proved to be the most effective and economic nitrogen source for xylanase production and used for further optimization. Finally, the CCD and response surface methodology (RSM) were applied to determine the optimal concentration of each significant variable, which included urea, Na(2)CO(3) and MgSO(4). Subsequently a second-order polynomial was determined by multiple regression analysis. The optimum values of the critical components for maximum xylanase production were obtained as follows: x(1) (urea)=0.163 (41.63 g/L), x(2) (Na(2)CO(3))=-1.68 (2.64 g/L), x(3) (MgSO(4))=1.338 (10.68 g/L) and the predicted xylanase value was 14374.6 U/g dry substrate. Using the optimized condition, xylanase production by Aspergillus niger XY-1 after 48 h fermentation reached 14637 U/g dry substrate with wheat bran in the shake flask. CONCLUSION By using PBD and CCD, we obtained the optimal composition for xylanase production by Aspergillus niger XY-1 in SSF, and the results of no additional expensive medium and shortened fermentation time for higher xylanase production show the potential for industrial utilization.
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Affiliation(s)
- Yao-Xing Xu
- Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China.
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