Abstract: The 3-methyl-3-sulfanylbutan-1-ol (MSB) is a thiol molecule which could be used as food additive flavor agent and encountered in the white wine, in the coffee perfume, in the passion fruit and in the cat urine where it’s the responsible of its strong odor characteristics. Thus, this manuscript treated first the valorization of the cat-litters by extracting their MSB molecules using the ethanol-90° solvent. The number of the extraction per sample, its duration and the rinse cycle number are three factors influencing the extraction efficiency. In any case, the ethanol-90° extraction of the MSB molecule is interesting and allow to recover an MSB solution which concentration was deduced by the sulfur titration according to a BaCl2 precipitation procedure. Then, the second part of this manuscript treated the study of the esterification-addition reaction between the citric acid molecules and the MSB molecules. A titration procedure was established allowing to follow the sulfur concentration during this esterification-addition reaction. The results of these experimentations permitted not only to establish a kinetic study of this reaction but also to purpose some reactional mechanism where it was discovered that the sulfur atom of the MSB molecule play a fundamental role during this citric acid esterification reaction. Additionally, the kinetic parameters indicated that the protonic acid H+ concentration, the citric acid concentration and the MSB molecule concentration influenced the speed of this esterification reaction between the citric acid molecules and the MSB molecules. Finally, using the results and experimental conditions of the esterification reaction, the third part of this manuscript was dedicated to the synthesis of a material based on black citric acid polymers (pn), pozzolana and citric acid named PPCA (pn-pozzolana-citric-acid) which could play the role of a cat-litter.Abstract: The 3-methyl-3-sulfanylbutan-1-ol (MSB) is a thiol molecule which could be used as food additive flavor agent and encountered in the white wine, in the coffee perfume, in the passion fruit and in the cat urine where it’s the responsible of its strong odor characteristics. Thus, this manuscript treated first the valorization of the cat-litters by ex...Show More
Abstract: The MSB - 3-Methyl-3-Sulfanylbutan-1-Ol is a thiol molecule which could be used as food additive flavor agent and encountered in the white wine, in the coffee perfume, in the passion fruit and in the cat urine where it’s the responsible of its strong odor characteristics. Its extraction from the cat-litter and the synthesis of a new material based on black citric acid polymers (pn), pozzolana and citric acid named PPCA (pn-pozzolana-citric-acid) was studied in the previous manuscript. This manuscript consisted to valorize the PPCA as material to extract and to retain the MSB - 3-Methyl-3-Sulfanylbutan-1-Ol molecule. Thus, reaction tests were done between a MSB - 3-Methyl-3-Sulfanylbutan-1-Ol solution and the PPCA. The first part of this manuscript treated the description of these reaction tests procedure and the various experimental conditions which was at ambient temperature, in the open air and at atmospheric pressure inside a container without a cover. It was also described on this first part the quantifications of the molecules and PPCA’s sites involved in this reaction such as citric acid residues, MSB, acid sites and basic sites which were especially considered as sites governing the reaction-extraction between the PPCA-material and the MSB - 3-Methyl-3-Sulfanylbutan-1-Ol molecules. The second part of this manuscript consisted on the analyzing of the previous reaction tests results which allowed to the evaluation of its kinetic parameters. In general, it was noted that the reacting basic sites increase as a primary product while the reacting acid sites evolved as a secondary product. Finally, a reaction mechanism governing the MSB extraction-reaction on the PPCA was proposed considering that the PPCA’s reactive sites acid were grouped into either acid sites either basic sites by Boëhm titration which could regenerated during the reaction. This proposed reaction mechanism was validated by the determination of the extraction-reaction kinetic constant k equals to 8E-4 superior to the kinetic constant determined by reaction results exploitation which is equals to 2.69E-08.
Abstract: The MSB - 3-Methyl-3-Sulfanylbutan-1-Ol is a thiol molecule which could be used as food additive flavor agent and encountered in the white wine, in the coffee perfume, in the passion fruit and in the cat urine where it’s the responsible of its strong odor characteristics. Its extraction from the cat-litter and the synthesis of a new material based ...Show More
Andry Tahina Rabeharitsara,Antsafanatitra Mandimbinirina Rabenarivo,Soloniaina Rakotoarijaona,Hanitraniaina Marie Ratsimba,Baholy Robijaona,Rakotomamonjy Pierre
Abstract: Cellulose is the most abundant natural organic polymer on earth and could be valorized and used in different applications. It’s mainly used to produce paper but also to produce biodegradable cellophane and biofuels. Thus, the extraction of cellulose from green plants, where it’s the most important structural component, was interesting. This manuscript treated the extraction of cellulose from the Dombeya Mollis leaf by esterification-reaction with citric acid molecules. This method is usually used to extract, to identify, to characterize and to quantify the active molecules of alive organisms but in this case the advantage to use the esterification-reaction with citric acid molecules is that the synthesized solution contains straightaway reticulated cellulose. Indeed, the refractive index value of the Dombeya Molli leaf’s cellulose-citric acid esterified solution was 1.336 in the vicinity of the refractive index values of citric acid-solid, citric acid in solution and nanocellulose which were respectively 1.493, 1.345 and 1.470. In addition, A cellulose quantification procedure using spectrophotometer UV-visible was performed and established in this manuscript and permitted to quantify the quantities of cellulose extracted from the plants to the solution by esterification-reaction with citric acid molecules. In consequence, a kinetic study was done under this esterification-reaction between citric acid molecules and Dombeya Mollis leaf’s cellulose and permitted to evaluate the speed constant with the partial orders of citric acid, cellulose and proton-H+ which play the role of catalyst-inductive during this esterification-reaction. At the end, a reactional mechanism which could govern this esterification-reaction between the Dombeya Mollis leaf’s cellulose and the citric acid molecules was proposed.
Abstract: Cellulose is the most abundant natural organic polymer on earth and could be valorized and used in different applications. It’s mainly used to produce paper but also to produce biodegradable cellophane and biofuels. Thus, the extraction of cellulose from green plants, where it’s the most important structural component, was interesting. This manuscr...Show More
