Sugarcane Bagasse Characterization

Sugarcane Bagasse CharacterizationThe major theme of a lignocellulosic biomass is lignin, cellulose and hemicellulose, which is responsible for the structure and rigidity of plant. These comp starnts has been reported to have broad(prenominal) potential energy and are been astray utilize as fuel in automobile and industries. The components of the bagasse were chemically characterized by measuring their dry weight. tabularize represents the composition of dry sugarcane bagasse analysed in the present study compared with data collected from other look for articles. The dissimilarities in composition of lignin and cellulose might be due to genetics variations, growing location, methods of harvesting, growing conditions and analytical procedures. confuse 1. Major component of sugarcane bagasseCellulose (%)Lignin (%)References4619.6Present topic40.5725.93(Zeng, Tong, Wang, Zhu, Ingram, 2014)2516.2(Dhabhai, Jain, Chaurasia, 2012)4023(Irfan, Gulsher, Abbas, Syed, Nadeem, 2011)45.4 23.4(Pereira, Jacobus, Cioffi, Mulinari, Luz, 2011)As per the motherd data, cellulose content in the bagasse was 46%, which was further reformed into accessible form for the saccharification enzyme. While the lignin constituted 19.6%, therefrom remotion of lignin was carried out by the pre-treatment of bagasse for an efficient enzymatic hydrolysis.Cellulose Unit ActivityThe AumEnzymes, India generously donated two commercial cellulases, superman Cellulase and sluggish cellulase. The cellulase activity of Aspergillus terreus, acid cellulase, and neutral cellulase were compared in order to proceed for the optimization of saccharification phase. The International Unit for enzyme activities (IU) of all the three cellulases were based on the total cellulase activity and endoglucanase activity, determined by the CMCase assay and FPU assay respectively. Table represents the FPU and CMCase activity presented by all the three enzymes. The data in the display board clearly concluded t hat all the three cellulase have negligible total cellulase activity, while they have a high amount of endoglucanase activity.Table 2. Comparison of Cellulase ActivityCellulaseCMCase Activity (IU)FPU Activity (IU)Aspergillus terreus0.2730.045Acid0.9660.028Neutral0.2230.000Which might indicate that all the cellulases has endoglucanase activity but, the negligible exoglucanases activity end pointed in considerable reduction in total cellulase activity. Since the Acid cellulase had relatively higher enzyme activity, it was further used as the saccharifying enzyme. The protein content in the Acid cellulose was found victimisation the protein assay and it was found to be 67.67 g/mg of Acid cellulase powder. The specific activity was 14.11 IU/mg of Acid cellulase, indicating that 14.11 mol of sugar is released by 1 mg of Acid cellulase (protein) in one unit.Optimization of alkalineThe statistical design used for the microwave assisted alkaline pre-treatment is a four factors (weight of bagasse, ply of microwave in wattage, NaOH concentration and the exposure time period) system, the result of the pre-treatment was based on the cellulose composition and reduced lignin after(prenominal) the pre-treatment. The design summary is shown in the Table .Table 3. Design SummaryStudy Type Response nearRuns 21Initial Design Central CompositeDesign forge QuadraticFactor beUnitsLow ActualHigh ActualLow CodedHigh Coded loadedABagasseg%2.510-116.25BMicrowaveW100600-11350CNaOHg%15-113DTimeminutes510-117.5ResponseNameUnitsAnalysisMinimumMaximumC.V %R2Y1Celluloseg%Polynomial081.29.30.9679Y2Lignin remotiong%Polynomial067.258.540.9735The design was a set of 21 runs, combinations of four factor observational design, based on the RSM and CCD (Tabel). The RSM is mathematical based system to study the interactions mingled with the factors, while the CCD enables us to conclude an optimal condition for the pre-treatment.Table 4. Test design and results of response surface analysisF actor 1Factor 2Factor 3Factor 4Response 1Response 2StdRunASubstrateBMicrowaveCNaOHDTimeCelluloseLignin RemovalgWg%minutesg%g%1616.253503.011.776.848.141526.253503.03.359.242.7632.501005.05.05544.352146.253503.07.572.346.7852.501001.05.048.535.3810612.563503.07.574.642.71376.25350-0.47.548.25405810.001001.010.050.638.499-0.063503.07.50019106.253503.07.571.246.820116.253503.07.579.550.321210.006001.05.056.242.74132.506001.010.059.9848.2531410.001005.010.060.652.111156.25-703.07.56148.5318166.253503.07.577.144.237172.506005.010.075.662.512186.257703.07.576.367.2517196.253503.07.569.748.912010.006005.05.071.8557.2314216.253506.47.581.260.56According to the table, runs 17, 18 and 21 had maximum lignin removals while the 1, 1 and21 showed maximum maintained cellulose. The quadratic polynomial polynomial equations describes the correlation between the crucial coefficients i.e. p- honor (ProbF) less than 0.05 and is used to obtain the regression determine of coefficients where unaccomp anied significant coefficients are considered. save since this gravel supports hierarchy, the insignificant coefficients were not omitted. This equation was used to derive the predicted responses for cellulose (equation 1) and lignin removal (equation 2)Equation1Equation 2The sufficiency of the quadratic model for the experimental responses (cellulose Y1 and lignin removal Y2) was checked using the Analysis of Variance (ANOVA), which was verified using the Fishers statistical model (F- honour). The table shows the ANOVA for Y2 response.Table 5. ANOVA result of quadratic regression model for lignin removalSourceSum of SquaresMean squaresF- hold dearp-value (Prob F)Model3411.2314243.6615.740.0014significantA-Bagasse911.651911.6558.880.0003B-Microwave175.221175.2211.320.0152C-NaOH541.911541.9135.000.001D-Time14.80114.800.960.366AB3.8813.880.250.6347AC3.1413.140.200.6684AD0.8610.860.060.8216BC4.6714.670.300.6028BD534.561534.5634.520.0011CD2.4812.480.160.7031A2955.511955.5161.710.000 2B2362.141362.1423.390.0029C274.46174.464.810.0708D23.9513.950.250.6317Residual92.90615.48 wishing of Fit71.34235.676.620.0539not significantPure Error21.5645.39Cor Total3504.1320ANOVA of the regression model for lignin removal had 15.74 F-value which described that the model is significant and also defined that there is only 0.14% chance that a Model F-value this large could a rear due to noise. Since the p-value 0.0014, lesser than 0.005, it indicates that the lignin removal is radiosensitive to the coefficients/factors in the model. In other words weight of bagasse (A), microwave exposure (B), NaOH (C), BD, A2 and B2 have strong mildew on the lignin removal. The p-value 0.0011 for BD (B-coded for microwave, D-coded for time), indicates the strong mutual interaction between B and D in removal of lignin. The Lack of Fit F-value of 6.62 justifies that there are 5.39% chances that such large values of Lack of Fit F-value might authorise due to noise, where lack of fit is an error that would occur when one of the factor is omitted from the cognitive process model. Another statistical measurement that is a signal to noise is the Adequate precision. The desirable ratio is greater than 4, as such the Adeq Precision value is 20.22, this model can be used to navigate design seat and further optimization. Multiple correlation corfficient or R2 value denotes the correlation between sight and predicted values, i.e. if the value is side by side(predicate) to 1, it means better correlation. In this case the R2 value is 0.9735, indicating better agreement between experimental values and predicted values. The coefficient of variation (CV) indicates the degree of precision to which the experiments are compared. The lower dependableness of the experiment is usually indicated by a high value of CV. In the present case the CV value is low (8.5%) indicates a candid precision and reliability of the experiment. At the same time, Adjusted determination coefficient (Adj R2) was high specifies improved precision and reliability of the conducted experiments.The 3D surface plot illustrated below (Figure) shows co-operative effect of microwaves and NaOH on the removal of lignin. From the plot, it can be predicted that with rise the concentration of NaOH and high powered microwaves exposure a attachd degradation of lignin was observed, maximum lignin removal is observed with 5% NaOH concentration and microwave irradiation with power of 600W. But the low power microwaves and NaOH concentrations had no firm removal of lignin.Figure 1. Co-operative effect of Microwaves and NaOH on lignin removalThe second response considered in the pre-treatment was the amount of cellulose retained (Y1) after the process. The ANOVA of quadratic regression model for cellulose retained after pre-treatment illustrated in Table is a significant model as evident from the Fishers F-test value (12.91) with a very low probability value (Prob F) = 0.0165. This also indicates that there is only 0.24% chance that the F-value occurs due to errors during the experiments. Among model terms A, C, BD and A2 are also significant with probability of 99%. The interaction between B and D significant effect on increase in cellulose retaining response. The goodness of fit of the model was checked by determination coefficient (R2). In this case, the value of the R2 (0.9676) indicates that only 3.24% of the total variation between experimental values and predicted values are not explained by the model. The value of the adjusted determination coefficient (Adj. R2=0.8929) was also high, at the same time a relatively lower value of the coefficient of variation (C.V. = 9.3%) which indicates model is significant and the conducted experiment is consistent and has a good precision. The level of noise that touched the model is also very low, i.e. 11.16% determined using the Lack of Fit F-value (3.99). The Adequate Precision (15.608) for this model is greater than 4, this suggests the model can be used for navigating the design space and optimizing the experiment.Table 6. ANOVA result of quadratic regression model for cellulose concentration after pre-treatmentSourceSum of SquaresdfMean SquaresF-valuep-value (Prob F)Model6226.9914444.7912.910.0024significantA-Bagasse2782.5812782.5880.760.0001B-Microwave117.051117.053.400.1149C-NaOH779.621779.6222.630.0031D-Time154.881154.884.490.0783AB36.72136.721.070.3417AC1.5611.560.050.8387AD8.1418.140.240.6441BC27.27127.270.790.4079BD1626.8811626.8847.210.0005CD1.5111.510.040.8414A22013.0612013.0658.420.0003B24.0814.080.120.7426C254.52154.521.580.2552D28.4618.460.250.6379Residual206.74634.46Lack of Fit137.67268.833.990.1116not significantPure Error69.07417.27Cor Total6433.7320Figure is a 3D response surface plot generated for 6.25 g of bagasse and 7.5 minutes of treatment by the regression mode, illustrates the effect of microwave irradiation (B) and NaOH (C) variables and the interactive effects of each on the cellulos e concentration. It can be observed that by increasing both factors B and C results in increased cellulose concentration. The shading on the graph indicates the NaOH concentration from 3% to 5% is adequate for increasing the cellulose concentration to 75% and above on with the microwave irradiation within range of 350 W to 600W. Which indicates that higher microwave irradiation favours lignin removal. This results in high power consumptions and charring of cellulose. To avoid the destruction of cellulose to an inaccessible substance, the treatment can be carried at lower power microwave irradiations under high pressures.The two response models of microwave assisted alkaline pre-treatment have shown tyrannical influence on the removal of lignin and increased cellulose in bagasse. Thus the statistical analysis is reliable to generate the optimal conditions required for pre-treatment, the optimum condition was predicted using numerical optimization.The optimal values selected were, 6 .37 g of bagasse irradiated at 350 W in 5% NaOH solution for 8.87 minutes. The predicted cellulose concentration was 81.94% and 56.6% lignin removal. The figure represents the graph obtained using the numerical optimization methods.Figure 2. Co-operative effect of Microwave and NaOH on cellulose concentrationFigure 3. Counter plot for predicted values of Lignin removal and cellulose concentration at optimized conditionThere was 48% loss in dry weight of the bagasse after pre-treatment at optimized conditions, which might be either due to removal of lignin or lost during the washing process after pre-treatment bagasse. The result was similar to the work done by (Farid, Noor El-Deen, Shata, 2014).Optimization of SaccharificationThe pre-treated bagasse was washed and further used for saccharification using the Acid cellulase. The efficiency of saccharification is evaluated by the saccharification%, it is the ratio of sugar released and the amount of polysaccharide present in the baga sse. Thus the saccharification% was used as the response factor for the statistical design used to optimize saccharification. The saccharification% response was assessed as a function of pre-treated bagasse loading (A), Acid cellulase loading (B) and time of incubation (C). The design substantial using RSM and CCD is summarized in the Table below.Table 7. Design SummaryStudy Type Response SurfaceRuns 20Initial Design Central CompositeDesign Model QuadraticFactorNameUnitsLowActualHigh ActualLow CodedHigh