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Publications (154)
Study of the extraction of xylose and total phenolic compounds (TPC) from chestnut and beech with pressurized hot water was carried out following the experimental design methodology using time (30 min–90 min) and temperature (120 °C–170 °C) as factors. Results are compared under specific conditions with poplar and oak and with a mixture of the four...
Introducing enzymes during the extrusion process has been mainly used as new pretreatment techniques in the starch degradation process and, more recently, in the second generation bioethanol production. The technique, called the bioextrusion, is a special case of reactive extrusion. Starch and lignocellulose bioextrusion examples underline the good...
This study investigated the use of a mixture of n-hexane and methanol as a binary solvent for the direct oil extraction and resin separation from Calophyllum seeds, in a single step. Optimal oil and resin yields and physicochemical properties were determined by identifying the best extraction conditions. The solvent mixture tested extracted oil and...
This work aims at developing a continuous intensified green process to extract high-value added molecules from industrial hemp by-products. Hemp hurds and hemp dust were studied as potential sources for the production of two hydroxycinnamic acids (HCA): ferulic (FA) and p-coumaric acids (p-CA). Prior to pilot scale extraction, FA and p-CA analytica...
Biorefinery of sunflower whole plant was performed successfully using a thermo-mechano-chemical twin-screw reactor. This led to the aqueous extraction of oil and other biopolymers like proteins, pectins and non pectic sugars. It resulted in the overall fractionation of biomass, thus allowing a complete valorization of the input. This biorefinery pr...
Sweet clovers are legumes able to grow on most soils, and two sweet clover species, Melilotus albus and Melilotus officinalis have been introduced and are now cultivated on estuary land. We characterized the composition and morphology of sweet clover stems collected after the seeds had reached maturity. We also carried out histochemical analyses on...
New fiberboards were manufactured from a coriander cake through thermo-pressing, and the influence of thermo-pressing conditions (temperature, pressure and time) on the boards' mechanical properties, their thickness swelling and their water absorption was evaluated. Because the protein glass transition systematically occurred during molding, this r...
This study investigated biodiesel production from jatropha seeds in a single step, i.e. by simultaneous solvent extraction and transesterification of jatropha oil, and possibility to transform the obtained cakes into binderless particleboards. n-Hexane was used as extracting solvent. The best operating conditions were identified to obtain optimal b...
A process has been validated for the deconstruction of lignocellulose on a pilot scale installation using six types of biomass selected for their sustainability, accessibility, worldwide availability, and differences of chemical composition and physical structure. The process combines thermo-mechano-chemical and bio-catalytic action in a single twi...
Encapsulation of flavor and aroma compounds has been largely explored in order to meet appraisal demands from consumers by improving the impact of flavor during the consumption of food products. Even though several techniques have been used for encapsulating volatile compounds, i.e. spray drying, fluidized bed coating, coacervation and melt extrusi...
New fiberboards were manufactured from a coriander press cake through thermo-pressing, and the influence of thermo-pressing conditions on the boards’ mechanical properties, their thickness swelling, and their water absorption was evaluated. Such conditions included mold temperature, applied pressure, and molding time. Because the protein glass tran...
This study presents an assessment of the vegetable oil extraction from coriander fruits through mechanical
pressing, more specifically twin-screw extrusion. This comprises an evaluation of the oil recovery obtained and its respective quality, as well as the specific mechanical energy, representing an economical point of view. With regard to the ext...
Biorefinery for Food, Fuels and Materials 2015 symposium - BFFM 2015, 15 June 2015 - 17 June 2015 (Montpellier, France)
11th International Conference on Renewable Resources & Biorefineries 2015, 3 June 2015 - 5 June 2015 (York, United Kingdom)
Biorefinery for Food, Fuels and Materials 2015 symposium, 15 June 2015 - 17 June 2015 (Montpellier, France)
A continuous process combining an alkaline thermo-mechano-chemical pretreatment neutralization step, followed by injection of enzymes into the twin-screw extruder, was developed using sweet corn co-products as a biomass model. The implementation of the continuous process is described. Particular attention is paid to the influence of the bio-catalyt...
The objective of this study was to manufacture new biodegradable fiberboards by thermo-pressing. The starting material was deoiled cake (only 0.9% oil content), generated during the biorefinery of sunflower (Helianthus annuus L.) whole plant in a co-rotating twin-screw extruder. All fiberboards were cohesive mixtures of proteins and lignocellulosic...
As the worldwide demand for fuels and materials increases, fossil resources are decreasing and global warming is a concern, and thus the need for alternative solutions is high. In the industries of furniture and housing, particleboards are interesting materials, as they reutilize wastes from other industries (wood, agriculture) although they also r...
Different thermo-mechanical extrusion pretreatments were evaluated as alternatives to traditional biomass pretreatments for lignocellulosic ethanol production. Wheat straw, a commonly available agricultural co-product, was chosen as the substrate model for the study. Five thermomechanical pretreatments were evaluated: one purely thermomechanical (T...
New insulation fiberboards from sunflower cake with improved thermal and mechanical properties were produced by pressing at ambient temperature. Best compromise between mechanical and heat insulation properties (λ = 77.6 mW/m K at 25°C) was a starch-based board with 20% binder content. Because of its promising heat insulation properties, this new f...
The objective of this study was to investigate solvent extraction and in situ transesterification in a single step to allow direct production of biodiesel from jatropha seeds. Experiments were conducted using milled jatropha seeds, and n-hexane as extracting solvent. The influence of methanol to seed ratio (2:1–6:1), amount of alkali (KOH) catalyst...
A new process for the deconstruction of lignocellulosic biomass was evaluated. It combines thermo-mechano-chemical action and the bio-catalytic action of enzymatic hydrolysis in a twin-screw extruder. The process proceeds in three phases all conducted in a twin-screw extruder: an alkaline pretreatment, a neutralization phase and an enzyme impregnat...
An efficient and eco-friendly extracting process of wood by-products (maritime pine knots and stumps and aspen knots and barks) using a twin-screw extruder has been developed. This continuous device allowed a thermo-mechanical treatment of the woody material to recover fractions containing hydrophilic polyphenols and antiradical compounds. The brea...
The influence of thermo-pressing conditions on the mechanical properties of particleboards obtained from
Jatropha press cakes was evaluated in this study. Conditions such as molding temperature and press cake oil content were included. All particleboards were cohesive, with proteins and fibers acting respectively as binder and reinforcing fillers....
The objective of this study was to manufacture new thermal insulation fiberboards by thermo-pressing. The starting material was a slightly deoiled cake (17.6% oil content), generated during the biorefinery of sunflower (Helianthus annuus L.) whole plant in a co-rotating (Clextral BC 45, France) twin-screw extruder. All fiberboards produced were coh...
The effects of citric acid on wheat flour/glycerol/poly(lactic) acid (PLA) blends prepared by one-step twin-screw extrusion have been studied to improve barrier properties of starch based materials. A series of injected samples were produced from prepared compounds with varying ratio (0–20 part) of citric acid. The effects of citric acid on the wat...
Alfalfa was studied to define a new approach for green plant fractionation using twin-screw extrusion, leading to the production of a green filtrate, rich in proteins and a solid fibrous residue, rich in cellulose. The influence of the screw profile on protein recovery in the liquid extract and on plant dehydration was characterised. Three screw pr...
In the present work, we investigated the possibility of valorizing four date palm tree by-products: leaflets, rachis, leaf sheath and fibrillum as self-bonded materials. First, their chemical composition and morphological properties were studied and showed high neutral detergent fiber values for all samples (65–91%) as normally required for self-bo...
Commercial alpha-cellulose was compression-molded to produce 1A dog-bone specimens under various operating conditions without any additive. The resulting agromaterials exhibited a smooth, plastic-like surface, and constituted a suitable target as replacement for plastic materials. Tensile and three-points bending tests were conducted according to I...
The objective of this study was to evaluate the feasibility of mechanical pressing to extract oil from jatropha seeds using a twin-screw extruder. Experiments were conducted using a co-rotating (Clextral BC 21, France) twin-screw extruder. The influence of operating conditions on oil yield, specific mechanical energy and oil quality was examined. O...
Biorefinery of sunflower whole plant is conducted according to an aqueous process using a twin-screw extruder. Aqueous extraction of oil is looked upon as an environmentally cleaner alternative technology to solvent extraction. Twin-screw extruder carries out three unit operations continuously: conditioning and grinding of whole plant, liquid/solid...
Natural fibres from miscanthus and bamboo were added to poly(lactic acid) by twin-screw extrusion. The influence of extruder screw speed and of total feeding rate was studied first on fibre morphology and then on mechanical and thermal properties of injected biocomposites. Increasing the screw speed from 100 to 300 rpm such as increasing the feedin...
The aim of this study is to develop a new approach to green plant fractionation using twin-screw extrusion, leading to the production of a green filtrate, rich in proteins and a solid fibrous residue, rich in cellulose. The influence of the screw profile on protein recovery in the liquid extract and on plant dehydration was characterized. Two screw...
The aim of this study was to investigate a suitable technology for the use of bagasse of Agave tequilana W. var. azul in food ratios for ruminants. Physical and chemical characteristics of bagasse were evaluated. According to these characteriztics, bagasse can be used as a supplement in ruminant feeding. However, an inconvenience is the low digesti...
The starting material used in this study was a cake generated during thermo-mechanical fractionation of sunflower (Helianthus annuus L.) whole plant in a twin-screw extruder. It was slightly deoiled (16.7% of oil in dry matter). Composed mainly of fibers and proteins, it could be considered as a natural composite and was processed successfully into...
A method of treating a solid lignocellulosic material (10) in which the solid lignocellulosic material (10) is subjected to a treatment, called a mechano-chemical treatment (1), of mixing and chemical degradation of the solid lignocellulosic material (10) so as to form an intermediate composition having a hydrated lignocellulosic material whose enz...
L'invention concerne un procédé de fabrication d'un matériau solide à partir d'une composition de plante oléagineuse, dans lequel : - on soumet d'abord ladite composition de plante oléagineuse à un traitement, dit traitement thermo-mécano-chimique, dans lequel on réalise une trituration de ladite composition de plante oléagineuse dans l'eau de faço...
Wheat flour was plasticized with glycerol and compounded with poly(lactic acid) in a one-step twin-screw extrusion process in the presence of citric acid with or without extra water. The influence of these additives on process parameters and thermal, mechanical and morphological properties of injected samples from the prepared blends, was then stud...
A process for hemicelluloses fractionation and purification from wheat straw and bran has been investigated and technical considerations (yields, purity) have been coupled to environmental characterizations (water consumption, carbon dioxide emissions) in order to develop an environment-friendly process. Extraction by twin-screw extrusion gave a yi...
This research studied the moisture sorption behaviour of jatropha seed allowing the development of a model correlating the equilibrium moisture content (EMC) and the free fatty acids (FFA) content as a function of water activity and EMC, respectively. Two sets of sorption-isotherm experiment were performed to describe the relationship between EMC a...
The objective of this study was to investigate in situ transesterification allowing direct production biodiesel from jatropha seed. The influences of amount of KOH catalyst, methanol to seed ratio, amount of n-hexane to methanol and seed ratio, stirring speed, temperature and reaction time were examined to define the best performance of biodiesel y...
Incorporation of a widely available agricultural by-product, wheat bran, into polylactic acid (PLA) have been investigated and compared to miscanthus and highly cellulosic fibres. They were compounded at different ratio from 10 to 40% wt. Influence on energy consumption during the process showed that the more filler added, the more energy needed bu...
Twin-screw extrusion is an original solution for the biorefinery of sunflower whole plant according to an aqueous extraction process. In best operating conditions, oil yield is 57% and residual oil content in the cake meal is 14%. Oil is extracted in the form of two oil-in-water emulsions stabilized by phospholipids and proteins at interface.
The c...
The mixture of hexoses and carboxylic acids produced by alkaline degradation of fructose was analyzed quantitatively by high-performance liquid chromatography. A pulsed amperometric detector with two Carbopac Dionex columns in series was employed in the assay of sugars (glucose, fructose, mannose, sorbose, and psicose), while a conductimeter with a...
The debris of olive pruning is a renewable, low-cost and widely available agricultural waste. Its biochemical conversion by hydrolysis and fermentation was attempted in the present paper. Diluted acid hydrolysis was conducted in a heterogeneous stirred tank reactor at 90ºC and at a low sulphuric acid concentration (0.0–1.0 N) for 300 min. To increa...
A twin-screw extruder was used for the extraction of wheat bran hemicelluloses by the co-extrusion of wheat straw and bran. As compared with a stirred reactor extraction, a twin-screw extruder resulted in a lower extraction rate (only about 24% of hemicelluloses in the wheat bran), but it has the advantages of a shorter residence time for the veget...
L'invention concerne un procédé de moulage d'un matériau solide, dit matériau éco-compatible, dans lequel : on choisit une matière organique solide comprenant au moins un composé choisi dans le groupe formé des polysaccharides et des polypeptides, ladite matière organique solide présentant un taux d'humidité inférieur à 12%, puis; on soumet cette m...
A new application of twin-screw extruder as a machine to conduct a thermo-mechanical pressing and a solvent extraction of sunflower oil in a single step and in a continuous mode was studied. Experiments were conducted using a CLEXTRAL BC 45 co-rotating twin-screw extruder and whole sunflower seeds with fatty acid methyl esters as a solvent. The inf...
The objective of this study is to evaluate the feasibility of an aqueous process for the biorefinery of sunflower whole plant using a co-rotating twin-screw extruder. Traditionally, aqueous extraction of oil is looked upon as an environmentally cleaner alternative technology to the solvent extraction (Rosenthal et al., 1996) and the twin-screw extr...
Porous bricks produced by extrusion were obtained by adding vegetable matter of various compositions and shapes. The main objective of this article is precisely to investigate the possibilities offered by vegetable matter. During firing, the burning of the vegetable matter created pores and an increase in open porosity ranging from 11% to 18% was o...
During the last decade, thermoplastic starch (TPS) has been studied more and more, alone and in blends. One key property of TPS is its viscosity. A lab-scale conical twin-screw extruder has been used to process polymers or blends of polymers at a small scale (7 cm3), and to measure their viscosity by pressure loss in a backflow channel. TPS has bee...
Twin-screw extrusion has been used for the protein extraction from sunflower and alfalfa. Thermo-mechanical fractionation and aqueous extraction are conducted simultaneously to collect separately a liquid extract and a solid raffinate.
From sunflower whole plant, squeezing in the reversed screws is favored by the fibers abundance in the stalk, and...
The objective of this study was to evaluate the feasibility of an aqueous process for the biorefinery of sunflower whole plant using a twin-screw extruder. Aqueous extraction of oil was chosen as an environment-friendly alternative to the solvent extraction. The extruder was used to carry out three essential unit operations: grinding, liquid/solid...
Biorefinery of sunflower whole plant can be realized using a twin-screw extruder. Thermo-mechanical fractionation and aqueous extraction are conducted simultaneously. A filter section is outfitted along the barrel to collect continuously an extract and a raffinate (cake meal). Oil yield obtained is 53%. Proteins are partly extracted at the same tim...
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
The stem bark of Grewia venusta and the flower sepal of Bombax costatum, two mucilaginous plants, were investigated as potential sources of bioadhesives for formaldehyde-free particleboards. Mucilage and pectin fractions of both plant organs were analysed for monosaccha- rides identification and quantification. The binding properties of these mucil...
Biorefinery of sunflower whole plant can be conducted with water by thermo-mechano-chemical fractionation in a Clextral BC 45 (France) co-penetrating and co-rotating twin-screw extruder. An extract and a raffinate are produced separately and in a single continuous step.
The arrangement of screw profile makes possible to define three successive zone...
Fractionation of sunflower whole plant is carried out with water in a twin-screw extruder. An extract and a raffinate are produced in a single step. Oil extraction yield is 55%. Lipids are extracted in the form of two oil-in-water emulsions: the higher hydrophobic phase and the lower one.
Stability of both hydrophobic phases is ensured by the prese...
Twin-screw extrusion is a powerful solution for biorefinery of sunflower whole plant. Thermomechanical fractionation and aqueous extraction are conducted simultaneously. A filter is outfitted along the barrel to collect a filtrate and a cake meal. Best oil yield is 57%. Proteins are also partly extracted, just as pectins. The cake meal is relativel...
Thermoplastic sugar beet pulp (thermo-mechanical processing was discussed in previous studies) was formed into film strips by extrusion. Film tensile properties are discussed according to the molecular structure of external plasticizer. Sorbitol, fructose and adipic acid have a marked antiplasticizing effect, while urea and xylitol gave higher ulti...
The objective of this study was to evaluate the feasibility of an aqueous process to extract the residual oil from sunflower press cakes using a co-rotating twin-screw extruder. Two different configurations were tested: the expression from whole seeds followed by the aqueous extraction, in two successive apparatus or in the same one. For the aqueou...
La présente invention concerne un procédé de préparation d'agrogranulats plastiques composites stables et calibrés comprenant les étapes suivantes: - introduire un sel de sulfites en solution dans un dispositif d'extrusion préalablement chargé en matière protéique végétale et en eau de telle sorte que la proportion de sulfite SO soit comprise entre...
Nowadays, the end-of-life of plastic products and the decrease of fossil energy are great environmental problems. Moreover, with the increase of food and nonfood transformations of renewable resources, the quantities of agro-industrial byproducts and wastes increase hugely. These facts allow the development of plastic substitutes made from agro-res...
Selective hydrolysis of the hemicellulose fraction of olive-pruning debris was attempted in order to achieve a maximum yield of fermentable D-xylose without degrading the cellulose fraction. To this end, hydrolysis with a dilute acid was conducted in a heterogeneous stirred tank reactor at mild temperature (70-90 °C) and sulfuric acid concentration...
The hydrolysis of lignocellulose materials under mild conditions leads to a solution of sugars from the hemicellulose fraction, as well as a series of compounds that can inhibit their possible fermentation. In an effort to reduce the degradation of the sugars, the debris from olive-tree pruning has been submitted to hydrolysis in an extruder type t...
The objective of this study was to evaluate the feasibility of an aqueous process to extract sunflower seed oil using a co-rotating twin-screw extruder. Aqueous extraction was carried out using whole seeds and the influence of the operating conditions on oil yield was examined. Operating conditions included screw profile, screw rotation speed, and...
In this preliminary study, it was shown that strong acid ion exchange resins allowed the dehydration of D-fructose to 5-hydroxymethyl-2-furancarboxaldehyde at mild temperatures and pressures. Evidence was given that the use of a solvent (i.e. methyl isobutylketone) with high extracting power toward the obtained compound improved the yield of this r...
The effects of the sugar and catalyst concentrations on the dehydration reaction of D-fructose to 5-hydroxymethyl-2-furancarboxaldehyde when a triphasic medium water-solvent-ion exchange resin is used, are described.
The best conditions for the production of 5-hydroxymethyl-2-furancarboxaldehyde (HMF) in an ion exchange resin-water-solvent triphasic system have been determined using static operating conditions.
Aqueous extraction process is an alternative to the solvent oil extraction process from oilseeds. It enables simultaneous recovery of oil and protein. Water extraction of sunflower oil is carried out with a mixer (model Waring Blendor, USA) as batch reactor (seeds/water: 15/85). This only apparatus carries out two essential unit operations: conditi...
The necessity of natural resources protection impose to every country the use of renewable resources based alternatives as annual plants, agricultural and agro-industrial residues for human needs. The aim of this study is to obtain with local biomaterials, efficient flat composites which can be used as substitute of sawlog in furnishing and buildin...
Aqueous extraction of sunflower oil is a reasonable environment-friendly alternative to the solvent extraction. It can even be realized directly from the whole plant using the twin-screw extrusion technology. Co-rotating twin-screw extruder behaves like a chemo-thermo-mechanical reactor. Equipped with a filtration module, it allows to separate extr...
Extending the synthesis of furanic polyols to mixtures of sugars representative of hemicellulose hydrolyzates leads to important yields of furanic polyols of glucose and xylose together with high yields of unreacted L-arabinose.
A stepwise method for the conversion of D-fructose into 5-chloromethyl-2-furancarboxaldehyde is described. The sugar was first subjected to acid-catalysed dehydration in N,N-dimethylformamide to give 5-hydroxymethyl-2-furancarboxaldehyde as an intermediate. The latter was then chlorinated in situ with phosphorylchloride, to give the named chloro-co...
A new method for the synthesis of 5,5′-oxydimethylenebis (2-furfural) by thermal dehydration of 5-hydroxymethyl-2-furfural in the presence of dimethyl-sulfoxide is described. Optimum conditions are studied by experimental design. Reaction media present a high concentration of HMF. Reaction is supposed to be rapid. Yields reach 55% with a 84% select...
The 4-Hydroxy-2,6-dioxabicyclo(3,3,0)Octan-8-one[1S,4S,5R], monoketone, is obtained by catalytic oxidation of isosorbide—or 2,6-dioxabicyclo(3,3,0)4,8-octandiol[1R,4S,5R,8R]—in an aqueous solution with a stream of oxygen and in the presence of a platinum on carbon catalyst. Setting up sequentially two experimental designs made it possible to study...
Aqueous extraction process using water alone as medium is an alternative to the solvent oil extraction process from oilseeds. It enables simultaneous recovery of oil and protein. The implementation of a co-rotating twin-screw extruder allows the aqueous extraction of oleic sunflower oil from whole plant.
Screw configuration, screw rotation speed an...
Etude de la destruction pyrolytique de quelques plantes de la flore togolaise susceptibles d’entrer dans l’elaboration des composites thermo-formes
AY Nenonene, K Koba, KE Atcholi, L Rigal, K Sanda
Abstract
The manufacturing process of thermal pressed and thermoformed composites requires a relatively significant utilization of heat which leads to...
The objective of this study was to investigate the screw configuration allowing oil extraction from sunflower seeds with a twin-screw extruder. Experiments were conducted using a co-rotating twin-screw extruder. Five screw profiles were examined to define the best performance (oil extraction yield, specific mechanical energy and oil quality) by stu...
Film extrusion of sunflower protein isolate (SFPI) was studied. The influence of die temperature (85 to 160°C), water and glycerol contents were investigated through appearance, mechanical and thermo-mechanical properties and swelling behavior in water of films. It was demonstrated that highest temperature, well above SFPI denaturation temperature...
Sugar beet pulp (SBP) is the raffinate of sugar extraction. Composed of empty vegetal cells, three quarters of it consist of polysaccharides. As it is cheap and produced in great quantities SBP is a potential raw material for industrial applications other than cattle feeding. Twin-screw extrusion modified its structure and destructuring level depen...
Thermoplastic properties of extruded sugar beet pulp (SBP) are closely linked to water–polymer relationships. DSC analyses of water evaporation, water fusion and biopolymer relaxation according to SBP moisture content gave a more accurate estimation of SBP hydration steps than classical water adsorption isotherm. Three moisture contents (8%, 26%, 4...
Through a twin-screw extrusion process the native structure of sunflower oil cake was completely transformed (globular protein denaturation/texturization and husk fiber defibration) into a simpler matrix-fiber structure, as could be seen on SEM micrographs. Further chemical reduction of protein disulfide bridges greatly reduced the melt viscosity o...
The objective of this study was to investigate the effects of screw configuration, position of screw elements and spacing between them allowing to realize oil extraction of oleic sunflower seeds on a twin-screw extruder. Experiments were conducted using a co-rotating twin-screw extruder (Model Clextral BC 45, France). Twelve screw profiles were exa...
The present work deals with the determination of the optimal operating conditions of lactic acid synthesis by the alkaline degradation of fructose. It is a complex transformation for which detailed knowledge is not available. It is carried out in a batch or semi-batch reactor. The ‘‘Tendency Modeling’’ approach, which consists of the development of...
The dynamic headspace titration of the volatile constituents of the black truffle (Tuber Melanosporum) is planned to be carried out with the new gas chromatographic DCI using Tenax trapping. In this paper the necessary optimization of the experimental factors which influence the desorption of the volatiles from the sample and the adsorption on the...
In order to reduce environmental risks during the service life of the treated wood and to find new alternative developments on the durability of wood, some research and technology development have been made on thermal treatment. The retification process is one of these processes. The retification process induces chemical modification of the lignin...
A means is developed for forming polysaccharide-based composites with useful material properties through use of unmodified and chemically modified natural rubber latex (NRL). Starch was used as a model for polysaccharides. The NRL was modified by grafting with dimethylaminoethyl methacrylate (DMAEMA) to form a latex with cationic water-soluble poly...
This work presents a dynamic transport model of a solid–liquid media through a twin-screw extruder (TSE). The application under consideration is the solid–liquid extraction of solute from raw plant substrate. Dynamic experiments are performed and compared with the simulated results for step functions on the solid feed rate and on the screw rotating...
Xylans can be coextracted from wheat straw and bran in a twin-screw extruder. The best results for both the production yield and the extract properties are obtained with low alkali content, as the majority of the xylans comes from bran. The desired concentration of the extract solution can be achieved by ultrafiltration. The membrane configuration...
The thermoplastic potential of a sunflower protein isolate (ISFP) was studied with the aim of obtaining films of biodegradable polymers. Several polyalcohols (ethylene glycol (EG), propylene glycol (PG), polyethylene glycols (PEGs), polypropylene glycols (PPGs)) were tested as protein plasticizing agents. Five plasticizers were chosen (glycerol, et...
The rheological properties of a sunflower protein isolate (SFPI) were studied, and injection-molded pieces were produced. Various mixtures of SFPI (100 parts by weight), glycerol (10−50 parts), water (10−50 parts), and sometimes sodium sulfite (used as reducing agent, 1−10 parts) were studied. Power-law-type modeling of the viscosity as a function...
DSC analysis in pressure resisting pans of sunflower oil cake makes appear the endothermic peak of sunflower globulins denaturation. Its temperature decreases from 189.5 to 119.9°C while the corresponding enthalpy increases from 2.6 to 3.3J/g of sample, or from 6.7 to 12.2J/g of dry protein, when the samples moisture content varies from 0 to 30.0%...
