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Different conditions of sugarcane bagasse pretreatment were evaluated using citric acid, considering in further analysis the combined severity factor. Temperature, time and citric acid concentration were used as input variables. In a Gas Chromatographer Perkin Elmer-Clarus 400, the levels of xylose, glucose and hemicellulose were determinate. Initial recovery rate are also determinate for each pretreatment condition in addition to combined severity factor. The linearity was demonstrated between: the release of xylose and hemicellulose, the xylose and initial material recovery and between hemicellulose and combined factor of severity. Linear correlation coefficients were higher than 0.75 in all cases, with statistic significance greater than 95%. Three empirical models are reported that were adjusted to predict the release of xylose, hemicellulose and initial material recovery. [ABSTRACT FROM AUTHOR]

Copyright of Bistua: Revista de la Facultad de Ciencias Básicas is the property of Facultad de Ciencias Basicas de la Universidad de Pamplona and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With this work an estimate of uncertainty is performed to determine whether the screening of new business opportunities in the Sugar Company Ignacio Agramonte, Camagüey, from the proposals of its business is feasible, forecasts and statistical analyzes were performed from employment package Statgraphics Centurion XVI, for this a forecasting model set is identified by historical data of the company, confidence intervals for the forecast are simulated, the uncertainty associated with the prediction is evaluated, as well as assumptions made by the company and impacts for possible restructuring and / or assimilation of a new production are identified by the software SuperPro Desing version 9, determining that the projections of the company are very close to the model set an optimistic scenario and accept new projects employers, including the investment of two plants for the production of D-xylose and Xylitol. [ABSTRACT FROM AUTHOR]

Gabriel Bertrand (1867-1962), a prolific French biochemist, pharmacist, and chemist, one of the fathers of enzymology, discovered an important number of enzymes, showed that many of them contained a metal, and the importance of traces of many elements on the development of living organisms. He synthesized many new compounds by oxidation of keto sugars and polyalcohols, studied the poison of batrachians and vipers and prepared their antidotes, studied wine fermentation, the transformation of xylose into xylite, the phenomena produced by Aspergillus Niger, the action of yeast, alkaloids, etc. [ABSTRACT FROM AUTHOR]

The present work it has main objective to evaluate the feasibility of producing xylitol from xylose syrup, by means of technical economical analysis of the proposed technology. In Ignacio Agramonte Sugar Factory, Camaguey province was intending, for the raw materials use and auxiliary facilities. A technology for xylitol production, was proposed and the plant capacity was estimate, the total production cost of xylitol is 480.30 $ by ton. [ABSTRACT FROM AUTHOR]

Glucose and xylose, the highest components of the lignocellulosic material, are the raw material used for the production of ethanol by means of fermentation. This paper carries out a design of experiments aimed at studying the fermentative capacity of the Pachysolen tannophilus yeast, based on the specialized literature review about obtaining ethanol from glucose, xylose, and mixtures of both. Strains of microorganisms and common operating conditions are studied for this purpose. The fermentation is carried out using the yeast in its natural form which is capable of fermenting sugars from 5 carbon atoms such as the xylose, during a 24-hour study period. Several relationships are used for the analysis of mixtures of sugars such as: 25% xylose /75% glucose, 50% xylose / 50% glucose and 75% xylose/25% glucose, with an initial concentration of 20 g / l sugar, a 150 rpm rate of stirring and a 30 Ú C temperature. The sampling time lasted 48 hours. High Performance Liquid Chromatography (HPLC) was used for the analysis of samples. At 48 hours from starting the test it was obtained a concentration of 4.5 g/L for 50% xylose / 50% glucose mixtures of sugars. [ABSTRACT FROM AUTHOR]

Copyright of Revista Colombiana de Biotecnología is the property of Universidad Nacional de Colombia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A comparative technic --economic analysis of the possibilities of ethanol production from xylose and glucose or ethanol production from glucose and furfural from xilose was made. Moreover, in the study are analyzed both alternatives including the lignin supply for raw material from other productions. The cost of ethanol liter, the cost of production and PRD were considerer economical indicators. The results show that the alternative considering the ethanol productions from xylose present lower cost by ethanol liter and PRD upper to 6.5 years, but higher values of the cost of production with relation the alternative that considering the furfural from xilosa. The PRD of the variant the furfural like byproduct is 2.5 years, that it is an indicative of obtain the profitability by mean to coproducts in analyzed conditions. [ABSTRACT FROM AUTHOR]