Pub Date : 2012-01-01DOI: 10.4172/2167-7972.1000E121
Y. Dahman
Poly (lactic acid) (PLA) is one of the most versatile environmentfriendly biodegradable thermoplastic polyester. It is linear aliphatic thermoplastic polyester derived from 100% green and renewable sources such as corn (Figure 1). PLA has wide range of properties such as bio-compatibility, bio-degradability, less toxicity, vast range of mechanical properties and the ability to be molded into different shapes. These properties make it a very suitable material for applications similar to plastics and more widely in biomedical fields [1]. Low molecular weight PLA was produced by Carother et al. in 1932. The first marketing of PLA for medical purpose was initiated by E. I.
{"title":"Poly (Lactic Acid): Green and Sustainable Plastics","authors":"Y. Dahman","doi":"10.4172/2167-7972.1000E121","DOIUrl":"https://doi.org/10.4172/2167-7972.1000E121","url":null,"abstract":"Poly (lactic acid) (PLA) is one of the most versatile environmentfriendly biodegradable thermoplastic polyester. It is linear aliphatic thermoplastic polyester derived from 100% green and renewable sources such as corn (Figure 1). PLA has wide range of properties such as bio-compatibility, bio-degradability, less toxicity, vast range of mechanical properties and the ability to be molded into different shapes. These properties make it a very suitable material for applications similar to plastics and more widely in biomedical fields [1]. Low molecular weight PLA was produced by Carother et al. in 1932. The first marketing of PLA for medical purpose was initiated by E. I.","PeriodicalId":12351,"journal":{"name":"Fermentation Technology","volume":"2014 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86808709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-01-01DOI: 10.4172/2167-7972.1000E119
Yaser Dhaman, Pallavi Roy
{"title":"Challenges and Generations of Biofuels: Will Algae Fuel the World?","authors":"Yaser Dhaman, Pallavi Roy","doi":"10.4172/2167-7972.1000E119","DOIUrl":"https://doi.org/10.4172/2167-7972.1000E119","url":null,"abstract":"","PeriodicalId":12351,"journal":{"name":"Fermentation Technology","volume":"16 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89870212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-01-01DOI: 10.4172/2167-7972.1000111
C. Zvidzai, C. Chidewe, J. Mubaiwa, S. Tinofa, W. Manjeese, R. Musundire
The effect of mesh sieve sizes; 0.84 mm, 1.0 mm and 1.19 mm on alcohol concentration, free reducing sugars profile and total acids produced was determined during opaque beer fermentation. The initial free reducing sugars increased from 7.23 ± 0.1 mmol/ml to 7.52 ± 0.03 mmol/ml and 7.67 ± 0.03 mmol/ml values as the sieve size decreased. Meanwhile, the final alcohol concentration attained for each fermentation reached leveled off after 72 hr producing 3.57 ± 0.06% (v/v), 4.09 ± 0.29 (v/v)% and 4.23 ± 0.25 (v/v)% in order of decreasing mesh sieve size translating to a volumetric productivity of 0.49, 0.54 and 0.61 g.l-1.h-1, respectively. Use of 1.0 mm grinding sieve produced a final ethanol concentration which increased by 9% compared to that of 1.19 mm and 23% to that of 0.84 mm sieve. This realized a Yp/s value increase of 2% with the use of 1.0 mm sieve and 4% with 0.84 mm. The final organic acids determined as lactic acid composition were noted to increase from 0.46 ± 0.01 (w/v)%, 0.48 ± 0.01 (w/v)% and 0.5 ± 0.02 (w/v)% concentration as the sieve size decreased respectively. However, in all brews, the final pH was noted to be of no significant difference (P>0.05) dropping from around the same initial pH value of 5.9 to 3.3. The opaque beer brew prepared with a mesh sieve size 0.84 had its initial free reducing sugars the highest and produced a brew with the highest final ethanol concentration that levelled off at 4.23 ± 0.25 (v/v)% after 120 hr. However, it was noted that mesh sieve size 1.0 mm, although it had a lower alcohol content compared to 0.84, it was recommended as an optimized maize grits because it produced an opaque beer product which was consistent and of acceptable palatability to the analysis of sensory evaluation.
{"title":"Pilot Plant Optimization for Alcohol Production in Fermentation of an Opaque Beer by Varying Sieve Size","authors":"C. Zvidzai, C. Chidewe, J. Mubaiwa, S. Tinofa, W. Manjeese, R. Musundire","doi":"10.4172/2167-7972.1000111","DOIUrl":"https://doi.org/10.4172/2167-7972.1000111","url":null,"abstract":"The effect of mesh sieve sizes; 0.84 mm, 1.0 mm and 1.19 mm on alcohol concentration, free reducing sugars profile and total acids produced was determined during opaque beer fermentation. The initial free reducing sugars increased from 7.23 ± 0.1 mmol/ml to 7.52 ± 0.03 mmol/ml and 7.67 ± 0.03 mmol/ml values as the sieve size decreased. Meanwhile, the final alcohol concentration attained for each fermentation reached leveled off after 72 hr producing 3.57 ± 0.06% (v/v), 4.09 ± 0.29 (v/v)% and 4.23 ± 0.25 (v/v)% in order of decreasing mesh sieve size translating to a volumetric productivity of 0.49, 0.54 and 0.61 g.l-1.h-1, respectively. Use of 1.0 mm grinding sieve produced a final ethanol concentration which increased by 9% compared to that of 1.19 mm and 23% to that of 0.84 mm sieve. This realized a Yp/s value increase of 2% with the use of 1.0 mm sieve and 4% with 0.84 mm. The final organic acids determined as lactic acid composition were noted to increase from 0.46 ± 0.01 (w/v)%, 0.48 ± 0.01 (w/v)% and 0.5 ± 0.02 (w/v)% concentration as the sieve size decreased respectively. However, in all brews, the final pH was noted to be of no significant difference (P>0.05) dropping from around the same initial pH value of 5.9 to 3.3. The opaque beer brew prepared with a mesh sieve size 0.84 had its initial free reducing sugars the highest and produced a brew with the highest final ethanol concentration that levelled off at 4.23 ± 0.25 (v/v)% after 120 hr. However, it was noted that mesh sieve size 1.0 mm, although it had a lower alcohol content compared to 0.84, it was recommended as an optimized maize grits because it produced an opaque beer product which was consistent and of acceptable palatability to the analysis of sensory evaluation.","PeriodicalId":12351,"journal":{"name":"Fermentation Technology","volume":"50 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90043142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-01-01DOI: 10.4172/2167-7972.1000101
C. A. Poorna
Extracellular xylanases free of cellulase produced by the alkalophilic bacteria Bacillus pumilus was purified to homogeneity throughout the precipitation with (NH 4 ) 2 SO 4 , Q-Sepharose chromatography and characterized. The purified xylanases were proteins, with molecular mass ~14 kDa (Xyl 1), ~ 35 kDa (Xyl 2) and ~ 60 kDa (Xyl 3) as determined by SDS-PAGE. The optimal temperature and pH for the action of the enzyme were at 50 o C and 7 respectively. They exhibited thermal stability over a range of 20 to 40 o C at pH-7 and has retained 85 % at 60 o C. The activity strongly inhibited by 10 mm of Hg 2+ , SDS and Fe 2+ . The xylanase exhibited Km and Vmax values were 4.0 mg/ ml, 5000 μmol/ min/ mg protein (Xyl 1) as well as 3.5 mg /ml, 3448 μmol/ min/ mg of protein (Xyl 2) for oatspelt xylan.
{"title":"Purification and Biochemical Characterization of Xylanases from Bacillus Pumilus and their Potential for Hydrolysis of Polysaccharides","authors":"C. A. Poorna","doi":"10.4172/2167-7972.1000101","DOIUrl":"https://doi.org/10.4172/2167-7972.1000101","url":null,"abstract":"Extracellular xylanases free of cellulase produced by the alkalophilic bacteria Bacillus pumilus was purified to homogeneity throughout the precipitation with (NH 4 ) 2 SO 4 , Q-Sepharose chromatography and characterized. The purified xylanases were proteins, with molecular mass ~14 kDa (Xyl 1), ~ 35 kDa (Xyl 2) and ~ 60 kDa (Xyl 3) as determined by SDS-PAGE. The optimal temperature and pH for the action of the enzyme were at 50 o C and 7 respectively. They exhibited thermal stability over a range of 20 to 40 o C at pH-7 and has retained 85 % at 60 o C. The activity strongly inhibited by 10 mm of Hg 2+ , SDS and Fe 2+ . The xylanase exhibited Km and Vmax values were 4.0 mg/ ml, 5000 μmol/ min/ mg protein (Xyl 1) as well as 3.5 mg /ml, 3448 μmol/ min/ mg of protein (Xyl 2) for oatspelt xylan.","PeriodicalId":12351,"journal":{"name":"Fermentation Technology","volume":"40 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2012-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84736478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}