scholarly journals Modeling the effect of dammar additions on the mass loss response of soy wax/beeswax/dammar blends via response surface methodology

2021 ◽  
Vol 1192 (1) ◽  
pp. 012019
Author(s):  
S I S Shaharuddin ◽  
N B A Aziz ◽  
N Bacho ◽  
N K M Khairussaleh ◽  
A Tumian ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Mass Loss ◽  
Response Surface ◽  
Design Space ◽  
Response Model ◽  
Anova Analysis ◽  
Lack Of Fit ◽  
Quadratic Response ◽  
Central Composite ◽  
Wax Removal

Abstract The wax used in the batik industry plays a significant role as its composition dictates the ease of wax rendering, dye layering, and wax removal process. This study aims to evaluate the effect of dammar additions on soy wax/beeswax blends based on the mass loss (%) of the wax-covered cotton fabric in 100°C water. Central composite design (CCD), a subset of response surface methodology (RSM) was used to develop a response model (Y: mass loss %) for three independent variables (X1:beeswax, X2:soy wax, X3:dammar). The final quadratic response model obtained (F value =5.43, lack of fit F value = 4.70, adequate precision = 7.65) was proposed in this study. ANOVA analysis showed that the standard error of design was relatively small, ranging between 0.43 to 1.18 for the design space. It was deduced from the response model, that increasing the dammar content in the soy wax/beeswax blends increases the mass loss (%), possibly due to the compositional inhomogeneity of the blends. The result of this study shows great potentials in formulating new soy wax-based compositions that produce varying degrees of ease of wax removal for the batik industry.

scholarly journals OPTIMASI RESPON PADA PERCOBAAN FAKTORIAL DENGAN MENGGUNAKAN METODE PERMUKAAN RESPON

2019 ◽  
Vol 4 (2) ◽  
pp. 51
Author(s):  
Falin Tristanti Ayu ◽  
Izzati Rahmi HG ◽  
Yudiantri Asdi
Keyword(s):  
Response Surface Methodology ◽  
Central Composite Design ◽  
Factorial Design ◽  
Response Surface ◽  
Lack Of Fit ◽  
Central Composite

Metode Permukaan Respon atau Response Surface Methodology adalah gabungan dari teknik matematika dan statistika yang digunakan dalam pemodelan dan analisis dimana respon yang diamati dipengaruhi oleh sejumlah variabel. Metode permukaan respon digunakan untuk mencari taraf-taraf peubah bebas yang dapat mengoptimalkan respon. Dengan metode ini dapat diketahui model empirik yang menyatakan hubungan antara variabel-variabel independen dengan variabel respon, serta dapat diketahui nilai variabel-variabel independen yang menyebabkan nilai variabel respon menjadi optimal. Eksperimen dengan metode permukaan respon dilakukan dalam dua tahap yaitu eksperimen tahap I dan eksperimen tahap II. Desain eksperimen yang digunakan pada eksperimen tahap I adalah desain faktorial dua level sedangkan desain eksperimen yang digunakan pada eksperimen tahap II adalah Central Composite Design (CCD). Tahapan dalam metode permukaan respon pada intinya yaitu mencari fungsi aproksimasi yang menyatakan hubungan antara variabel independen dengan variabel respon, mengestimasi parameter-parameter dari fungsi aproksimasi yang diperoleh dengan metode kuadrat terkecil dan selanjutnya dilakukan analisis pengepasan permukaan. Karakteristik permukaan respon digunakan untuk menentukan apakah jenis titik stasionernya maksimum, minimum atau titik pelana. Prosedur pengujian yang dilakukan dalam metode permukaan respon diantaranya uji kesesuaian model regresi (lack of fit), uji parameter regresi secara serentak dan pengujian asumsi residual.Kata Kunci: Desain eksperimen, Metode Permukaan Respon (Response Surface Methodology), Two Level Factorial Design, Central Composite Design (CCD)

Response surface methodology as a tool for modelling galacto-oligosaccharide production

2017 ◽  
Vol 84 (4) ◽  
pp. 464-470
Author(s):  
Claudia I. Vénica ◽  
Carina V. Bergamini ◽  
María C. Perotti
Keyword(s):  
Response Surface Methodology ◽  
Reaction Time ◽  
Mathematical Models ◽  
Response Surface ◽  
Maximum Concentration ◽  
Cheese Whey ◽  
Value Added ◽  
Reaction Conditions ◽  
Lack Of Fit ◽  
Central Composite

The experiments reported in this research paper describe the effects of β-galactosidase enzyme dose and cheese whey amount, on the maximum concentration and yield of galacto-oligosaccahride (GOS) and reaction time. The experimental plan was based on central composite rotational design (CCRD) and modelled by response surface methodology (RSM). The results indicate that the proposed mathematical models could adequately describe the concentration and yield of GOS and the reaction time within the limits of the factors that are being investigated. The variance analysis shows high values of coefficients of determination (>0·97) while no significant lack of fit was evident. Hence, the models could be employed to select reaction conditions applied in the manufacture of products enriched in bioactive compounds with high value-added.

scholarly journals Bioethanol production from cocoa waste by locally isolated microorganism using response surface methodology

2018 ◽  
Vol 3 (4) ◽  
pp. 160-166
Author(s):  
Shahabaldin Rezania ◽  
Shaza Eva Mohamad ◽  
Adibah Yahya ◽  
Madihah Md Salleh
Keyword(s):  
Response Surface Methodology ◽  
Ethanol Production ◽  
Response Surface ◽  
Simultaneous Saccharification And Fermentation ◽  
Inoculum Size ◽  
Fermented Food ◽  
Anova Analysis ◽  
Lignocellulosic Substrate ◽  
Central Composite ◽  
Simultaneous Saccharification

The rate of ethanol production can be affected by different parameters that involved during fermentation. In this study, acid treated cocoa waste (CW) was used as a lignocellulosic substrate for ethanol production in the simultaneous saccharification and fermentation (SSF) using microorganism isolated from locally fermented food tapai ubi and tapai pulut. For optimization, the experiments were carried out using response surface methodology (RSM). The effect of four independent variables temperature, CW concentration, inoculum size and pH during fermentation was investigated. A central composite design (CCD) was used to evaluate the effect and interactions of the parameters. ANOVA analysis revealed that pH and inoculum size had the most significant effects on the ethanol production. The optimized condition for the ethanol production was at temperature 31.7°C, pH 6.0, inoculum size 10.5% and CW concentration 0.3g/L while after optimization, ethanol podcution increased from 6.2±0.8g/L to 9.5±1.1g/L.

scholarly journals EFFECT OF SPINNING PARAMETERS ON PLA/PPC/CURCUMIN MICROFIBER DIAMETER: AN INVESTIGATION VIA RESPONSE SURFACE METHODOLOGY

2020 ◽  
Vol 21 (2) ◽  
pp. 197-211
Author(s):  
Sharifah Imihezri Syed Shaharuddin ◽  
AMIRUL AKMAL FAUZAN ◽  
MOHAMAD FARIS IZZUDIN MOHAMAD JAZI ◽  
NUR ATIQAH MOHD. AKHIR ◽  
MAIZATULNISA OTHMAN ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Melt Spinning ◽  
Processing Parameters ◽  
Lack Of Fit ◽  
Spinning Process ◽  
Itu Model ◽  
Predicted Values ◽  
Spinning Speed ◽  
Central Composite

The initial phase of this study was to investigate the effect of polypropylene carbonate (PPC) additions in polylactic acid (PLA)/curcumin (Cur) blends. It was observed that the presence of curcumin particulates behaved as a reinforcement filler for PPC additions up to 30 wt%. A specific composition was then invested to find the correlation between the fiber diameter and melt-spinning process parameters using central composite design (CCD), a subset of response surface methodology (RSM). Results showed that the spinning temperature had a greater effect than the spinning speed on the diameter of PLA/PPC/curcumin fiber. The response model indicated a good correlation between experimental and predicted values since the ANOVA analysis demonstrated high F-value of model adequacy at 10.34, non-significant lack of fit, precision adequacy of 9.94 and R2 value of 0.80. Therefore, this model can be used in a future study to establish the processing parameters for controlled fiber production. ABSTRAK: Fasa awal kajian ini adalah bagi mengkaji kesan penambahan karbonat polipropilin ke dalam campuran asid prolaktik (PLA)/kurkumin (Cur). Didapati kehadiran zarah-zarah kurkumin bertindak sebagai pengisi bantuan pada penambahan PPC sehingga 30 wt%. Komposisi tertentu kemudian dikaji bagi mencari kaitan diameter fiber dan parameter proses putaran-cair menggunakan rekaan komposit utama (CCD), dan subset metodologi gerak-balas permukaan (RSM). Keputusan menunjukkan suhu putaran berpengaruh besar berbanding kelajuan putaran pada diameter fiber PLA/PPC/kurkumin. Model yang bertindak balas ini menunjukkan kaitan yang baik antara eksperimen dan nilai yang dijangka kerana analisis ANOVA menunjukkan nilai-F yang tinggi pada 10.34 kecukupan model, tidak-ketara kurang padanan, kecukupan ketepatan pada 9.94 dan nilai R2 sebanyak 0.80. Oleh itu, model ini boleh digunakan pada kajian akan datang bagi menghasilkan parameter proses pengeluaran fiber kawalan.

Enzyme-assisted Extraction for Optimized Recovery of Phenolic Bioactives from Peganum hermala Leaves Using Response Surface Methodology

2018 ◽  
Vol 17 (4) ◽  
pp. 349-354
Author(s):  
Qadir Rahman ◽  
Anwar Farooq ◽  
Amjad Gilani Mazhar ◽  
Nadeem Yaqoob Muhammad ◽  
Ahmad Mukhtar
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Enzyme Concentration ◽  
Coumaric Acid ◽  
Assisted Extraction ◽  
Pre Treatment ◽  
Optimized Conditions ◽  
Enzyme Complexes ◽  
Hydrolysis Of ◽  
Central Composite

This study investigates the effect of enzyme formulations (Zympex-014, Kemzyme dry-plus and Natuzyme) on recovery of phenolics from Peganum hermala (harmal) leaves, under optimized conditions using response surface methodology. As compared to the other enzyme complexes, the yield (34 g/100g) obtained through Zympex-014-assisted extraction was higher under optimized conditions such as time (75 min), temperature (70°C), pH (6.5) and enzyme concentration (5 g/100 g) using central composite design (CCD). Effectiveness of Zympex-014 towards hydrolysis of P. hermala leaves cell wall was examined by analyzing the control and enzyme-treated leave residues using scanning electron microscope (SEM). GC/MS characterization authenticated the presence of quercetin (1.44), gallic acid (0.23), caffeic acid (0.04), cinnamic acid (0.05), m-coumaric acid (0.23) and p-coumaric acid (0.37 μg/g) as the potent phenolics in Zympex-014 based extract. It can be concluded from the findings of the current work that pre-treatment of P. hermala leaves with Zympex-014 significantly enhanced the recovery of phenolics that supports its potential uses in the nutra-pharamaceutical industry.

Response Surface Methodology towards Optimization of Calotropis Procera Essential oil Extraction by using Supercritical CO2.

2019 ◽  
Vol 09 ◽  
Author(s):  
Hossein Zaeri ◽  
Bahareh Kamyab Moghadas ◽  
Bijan Honarvar ◽  
Ali Shokuhi Rad
Keyword(s):  
Response Surface Methodology ◽  
Essential Oil ◽  
Response Surface ◽  
Extraction Time ◽  
Calotropis Procera ◽  
Retrieval Rate ◽  
The Family ◽  
Effects Of Temperature ◽  
Carbon Dioxide Co2 ◽  
Central Composite

: In this research, the extraction of essential oil from Calotropis Procera with the family name of Asclepiadaceae, by supercritical carbon dioxide (CO2) solvent has been investigated in detail, and the yield and chemical profile of the extracts achieved by this method were compared with those resulted by the conventional Hydro distillation method. To optimize the process parameters of CO2 supercritical extraction (SCE) of the Calotropis Procera, the Response Surface Methodology (RSM) with central composite design (CCD) was employed. The effects of temperature, pressure, and extraction time on the oil yield are considered for investigation. Results showed that the data were sufficiently fitted into the second-order polynomial model. The extraction conditions, including pressure, temperature, and extraction time, were studied between 150-200 bar, 40-50 ºC, and 50-100 min, respectively. The optimal conditions are achieved as the temperature of 47.19ºC, the pressure of 172.2 bar, and time of 86 minutes with the retrieval rate of 31.39%.

scholarly journals The effect of heat treatment and impact angle on the erosion behavior of nickel-tungsten carbide cold spray coating using response surface methodology

2021 ◽  
Author(s):  
Marios Kazasidis ◽  
Elisa Verna ◽  
Shuo Yin ◽  
Rocco Lupoi
Keyword(s):  
Heat Treatment ◽  
Response Surface Methodology ◽  
Mass Loss ◽  
Tungsten Carbide ◽  
Response Surface ◽  
Spray Coating ◽  
Impact Angle ◽  
Control Factors ◽  
Heat Treated ◽  
The Impact

AbstractThis study elucidates the performance of cold-sprayed tungsten carbide-nickel coating against solid particle impingement erosion using alumina (corundum) particles. After the coating fabrication, part of the specimens followed two different annealing heat treatment cycles with peak temperatures of 600 °C and 800 °C. The coatings were examined in terms of microstructure in the as-sprayed (AS) and the two heat-treated conditions (HT1, HT2). Subsequently, the erosion tests were carried out using design of experiments with two control factors and two replicate measurements in each case. The effect of the heat treatment on the mass loss of the coatings was investigated at the three levels (AS, HT1, HT2), as well as the impact angle of the erodents (30°, 60°, 90°). Finally, the response surface methodology (RSM) was applied to analyze and optimize the results, building the mathematical models that relate the significant variables and their interactions to the output response (mass loss) for each coating condition. The obtained results demonstrated that erosion minimization was achieved when the coating was heat treated at 600 °C and the angle was 90°.

scholarly journals Optimizing of Microalgae Scenedesmus sp. Biomass Production in Wet Market Wastewater Using Response Surface Methodology

2021 ◽  
Vol 13 (4) ◽  
pp. 2216
Author(s):  
Najeeha Mohd Apandi ◽  
Mimi Suliza Muhamad ◽  
Radin Maya Saphira Radin Mohamed ◽  
Norshuhaila Mohamed Sunar ◽  
Adel Al-Gheethi ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Biomass Yield ◽  
Biomass Productivity ◽  
Maximum Growth ◽  
Maximum Growth Rate ◽  
Aeration Rate ◽  
Composition Analysis ◽  
Wet Market ◽  
Central Composite

The present study aimed to optimize the production of Scenedesmus sp. biomass during the phycoremediation process. The biomass productivity was optimized using face centred central composite design (FCCCD) in response surface methodology (RSM) as a function of two independent variables that included wet market wastewater concentrations (A) with a range of 10% to 75% and aeration rate (B) with a range of 0.02 to 4.0 L/min. The results revealed that the highest biomass productivity (73 mg/L/d) and maximum growth rate (1.19 day−1) was achieved with the 64.26% of (A) and 3.08 L/min of (B). The GC-MS composition analysis of the biomass yield extract revealed that the major compounds are hexadecane (25%), glaucine (16.2%), and phytol (8.33%). The presence of these compounds suggests that WMW has the potential to be used as a production medium for Scenedesmus sp. Biomass, which has several applications in the pharmaceutical and chemical industry.

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