scholarly journals Optimization of Baker’s Yeast Production on Date Extract Using Response Surface Methodology (RSM)

Foods ◽  
2017 ◽  
Vol 6 (8) ◽  
pp. 64 ◽  
Author(s):  
Mounira Kara Ali ◽  
Nawel Outili ◽  
Asma Ait Kaki ◽  
Radia Cherfia ◽  
Sara Benhassine ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Baker’S Yeast ◽  
Baker's Yeast ◽  
Yeast Production

Electrochemical treatment of Baker's yeast wastewater containing melanoidin: optimization through response surface methodology

2012 ◽  
Vol 65 (12) ◽  
pp. 2183-2190 ◽  
Author(s):  
E. Gengec ◽  
M. Kobya ◽  
E. Demirbas ◽  
A. Akyol ◽  
K. Oktor
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Current Density ◽  
Baker’S Yeast ◽  
Optimum Operating ◽  
Operating Parameters ◽  
Baker's Yeast ◽  
Toc Removal ◽  
Removal Efficiencies ◽  
Yeast Wastewater

Effluents from Baker's yeast production plant contain a high percentage of color and a large amount of organic load. In the present study, Baker's yeast wastewater (BYW) is treated with the electrocoagulation (EC) process using Al electrodes. Operating parameters (pH, current density, color intensity and operating time) are optimized by response surface methodology (RSM). Quadratic models are developed for the responses which are removal efficiencies of color, chemical oxygen demand (COD) and total organic carbon (TOC) and operating cost (OC). Optimum operating parameters and responses are determined as initial pH 5.2, current density of 61.3 A/m2 and operation time of 33 min, and 71% of color, 24% of COD, 24% of TOC removal efficiencies and OC of 0.869 €/m3, respectively. The quadratic model fits for all responses very well with R2 (>0.95). This paper clearly shows that RSM is able to optimize the operating parameters to maximize the color, COD and TOC removal efficiencies and minimize the OC.

Optimization of baker's yeast wastewater using response surface methodology by electrocoagulation

Desalination ◽  
2012 ◽  
Vol 286 ◽  
pp. 200-209 ◽  
Author(s):  
Erhan Gengec ◽  
Mehmet Kobya ◽  
Erhan Demirbas ◽  
Abdurrahman Akyol ◽  
Kadriye Oktor
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Baker’S Yeast ◽  
Baker's Yeast ◽  
Yeast Wastewater

scholarly journals Application of Response Surface Methodology for Optimization of Permeabilization Process of Baker’s Yeast

2014 ◽  
Vol 16 (2) ◽  
pp. 31-35 ◽  
Author(s):  
Ilona Trawczyńska ◽  
Marek Wójcik
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Catalase Activity ◽  
Isopropyl Alcohol ◽  
Treatment Time ◽  
Baker’S Yeast ◽  
Operating Conditions ◽  
Yeast Cells ◽  
Optimum Operating ◽  
Baker's Yeast

Abstract Permeabilization was used for the purpose of transforming the cells of microorganisms into biocatalysts with an enhanced enzyme activity. Baker’s yeast cells were permeabilized with various organic solvents. A high degree of catalase activity was observed upon permeabilization with acetone, chloroform, isopropyl alcohol and ethyl acetate. Response surface methodology was used to model the effect of concentration of isopropyl alcohol, temperature and treatment time on the permeabilization of baker’s yeast cells to maximize the decomposition of H2O2. The optimum operating conditions for permeabilization were observed at 53.7% concentration of isopropyl alcohol, treatment time of 40 min and temperature of 15.6oC. A maximum value of catalase activity was found to be 6.188 U/g wet wt. and was ca. 60 times higher than the catalytic activity of yeast not treated by the permeabilization process.

Changes in Gene Expression of Commercial Baker's Yeast during an Air-Drying Process that Simulates Dried Yeast Production

2008 ◽  
Vol 106 (4) ◽  
pp. 405-408 ◽  
Author(s):  
Toshihide Nakamura ◽  
Satomi Mizukami-Murata ◽  
Akira Ando ◽  
Yoshinori Murata ◽  
Hiroshi Takagi ◽  
...  
Keyword(s):  
Gene Expression ◽  
Baker’S Yeast ◽  
Baker's Yeast ◽  
Drying Process ◽  
Air Drying ◽  
Yeast Production

Real-time fuzzy-knowledge-based control of Baker's yeast production

1995 ◽  
Vol 45 (2) ◽  
pp. 135-143 ◽  
Author(s):  
Terhi Siimes ◽  
Pekka Linko ◽  
Camilla von Numers ◽  
Mikio Nakajima ◽  
Isao Endo
Keyword(s):  
Real Time ◽  
Baker’S Yeast ◽  
Baker's Yeast ◽  
Knowledge Based ◽  
Yeast Production ◽  
Fuzzy Knowledge

scholarly journals Predicting By-Product Gradients of Baker’s Yeast Production at Industrial Scale: A Practical Simulation Approach

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1554
Author(s):  
Christopher Sarkizi Shams Hajian ◽  
Cees Haringa ◽  
Henk Noorman ◽  
Ralf Takors
Keyword(s):  
Carbon Dioxide ◽  
Baker’S Yeast ◽  
Overflow Metabolism ◽  
Baker's Yeast ◽  
Biochemical Engineering ◽  
Dissolved Carbon ◽  
Operation Conditions ◽  
Yeast Production ◽  
Scale Down ◽  
Carbon Dioxide Levels

Scaling up bioprocesses is one of the most crucial steps in the commercialization of bioproducts. While it is known that concentration and shear rate gradients occur at larger scales, it is often too risky, if feasible at all, to conduct validation experiments at such scales. Using computational fluid dynamics equipped with mechanistic biochemical engineering knowledge of the process, it is possible to simulate such gradients. In this work, concentration profiles for the by-products of baker’s yeast production are investigated. By applying a mechanistic black-box model, concentration heterogeneities for oxygen, glucose, ethanol, and carbon dioxide are evaluated. The results suggest that, although at low concentrations, ethanol is consumed in more than 90% of the tank volume, which prevents cell starvation, even when glucose is virtually depleted. Moreover, long exposure to high dissolved carbon dioxide levels is predicted. Two biomass concentrations, i.e., 10 and 25 g/L, are considered where, in the former, ethanol production is solely because of overflow metabolism while, in the latter, 10% of the ethanol formation is due to dissolved oxygen limitation. This method facilitates the prediction of the living conditions of the microorganism and its utilization to address the limitations via change of strain or bioreactor design or operation conditions. The outcome can also be of value to design a representative scale-down reactor to facilitate strain studies.

Integrated biological (anaerobic–aerobic) and physico-chemical treatment of baker's yeast wastewater

2005 ◽  
Vol 52 (10-11) ◽  
pp. 273-280 ◽  
Author(s):  
S. Kalyuzhnyi ◽  
M. Gladchenko ◽  
E. Starostina ◽  
S. Shcherbakov ◽  
B. Versprille
Keyword(s):  
Separation Process ◽  
Baker’S Yeast ◽  
Uasb Reactor ◽  
Baker's Yeast ◽  
Organic Loading ◽  
Cultivation Medium ◽  
Loading Rates ◽  
Physico Chemical ◽  
Yeast Production ◽  
Yeast Wastewater

The UASB reactor (35°C) was quite efficient for removal of bulk COD (52–74%) from simulated (on the basis of cultivation medium from the first separation process) general effluent of baker's yeast production (the average organic loading rates varied from 8.1 to 16g COD/l/d). The aerobic-anoxic biofilter (19–23°C) can be used for removal of remaining BOD and ammonia from anaerobic effluents; however, it suffered from COD-deficiency to fulfil denitrification requirements. To balance COD/N ratio, some bypass (∼10%) of anaerobically untreated general effluent should be added to the biofilter feed. The application of iron (III)-, aluminium- or calcium-induced coagulation for post-treatment of aerobic-anoxic effluents can fulfil the limits for discharge to sewerage (even for colour mainly exerted by hardly biodegradable melanoidins), however, the required amounts of coagulants were relatively high.

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