The Experts below are selected from a list of 1245 Experts worldwide ranked by ideXlab platform
Gary Chingacarrasco - One of the best experts on this subject based on the ideXlab platform.
-
on the nanofibrillation of Corn Husks and oat hulls fibres
Industrial Crops and Products, 2017Co-Authors: Fabiola Valdebenito, Miguel Pereira, Rodrigo Briones, Laura Azócar, Gustavo Ciudad, Gary ChingacarrascoAbstract:Abstract Cellulose nanofibrils (CNF) were isolated from agro-industrial waste (Corn Husks and oat hulls) and market kraft pulp fibres, and a detailed comparative study was performed. Initially, the raw materials were subjected to a conventional pulping process to remove lignin and hemicelluloses. The chemical pre-treatment was based on 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)-mediated oxidation and the mechanical treatment was carried out with a high-pressure homogenizer. An extensive characterization of the raw material and of the nanofibrillated celluloses was performed, considering structural and chemical aspects. CNF films were produced for their characterization by optical methods, laser profilometry (LP), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Considering the same pulping and chemical pre-treatment, the analyses indicated that the oxidized Corn Husks fibres had higher carboxylate content and thus a larger tendency to nanofibrillate compared to the oat hulls fibres. The obtained content of carboxylic acids was directly proportional to the content of cellulose in the assessed samples, confirming the selectivity of the TEMPO-mediated oxidation. The fibrillated Corn Husks material had a minor fraction of residual fibres (
Jumrusjumroendee N. - One of the best experts on this subject based on the ideXlab platform.
-
Cellulose acetate and adsorbents supported on cellulose fiber extracted from waxy Corn Husks for improving shelf life of frying oil
2018Co-Authors: Udomkun Patchimaporn, Innawong B., Jumrusjumroendee N.Abstract:Published online: 18 June 2018The efficacy of cellulose paper consolidated with cellulose acetate and mixed adsorbents (bentonite: activated clay: celite = 37.5: 50: 12.5 g with 1 g citric acid/100 g mixed adsorbents) on the physico-chemical properties of oil was evaluated during deep-fat frying of chicken nuggets for 7 days. Cellulose fiber and cellulose acetate were produced from waxy Corn Husks. Using adsorbents supported on cellulose fiber with or without cellulose acetate resulted in lower poly-unsaturated fatty acids (PUFAs), trans-fatty acid, free fatty acid (FFA), peroxide value (PV), and total polar materials (TPMs) compared with results from commercial filter paper (control). The L*, a*, and b* changes of treated oils were better than in control. Limiting the polarity in cellulose acetate might influence TPMs reduction but was more effective in overall quality improvement. The PUFAs, total trans-fatty acid, FFA, PV, and TPMs decreased by 1.8, 7.4, 37.0, 133.3, and 20.5%, respectively when compared with control. Therefore, the use of cellulose paper and cellulose acetate obtained from Corn Husks was found to significantly lengthen the life cycle of frying oil.Peer Revie
-
Cellulose acetate and adsorbents supported on cellulose fiber extracted from waxy Corn Husks for improving shelf life of frying oil
'Elsevier BV', 2018Co-Authors: Udomkun Patchimaporn, Innawong B., Jumrusjumroendee N.Abstract:Published online: 18 June 2018The efficacy of cellulose paper consolidated with cellulose acetate and mixed adsorbents (bentonite: activated clay: celite = 37.5: 50: 12.5 g with 1 g citric acid/100 g mixed adsorbents) on the physico-chemical properties of oil was evaluated during deep-fat frying of chicken nuggets for 7 days. Cellulose fiber and cellulose acetate were produced from waxy Corn Husks. Using adsorbents supported on cellulose fiber with or without cellulose acetate resulted in lower poly-unsaturated fatty acids (PUFAs), trans-fatty acid, free fatty acid (FFA), peroxide value (PV), and total polar materials (TPMs) compared with results from commercial filter paper (control). The L*, a*, and b* changes of treated oils were better than in control. Limiting the polarity in cellulose acetate might influence TPMs reduction but was more effective in overall quality improvement. The PUFAs, total trans-fatty acid, FFA, PV, and TPMs decreased by 1.8, 7.4, 37.0, 133.3, and 20.5%, respectively when compared with control. Therefore, the use of cellulose paper and cellulose acetate obtained from Corn Husks was found to significantly lengthen the life cycle of frying oil
Fabiola Valdebenito - One of the best experts on this subject based on the ideXlab platform.
-
CO2 Adsorption of Surface-Modified Cellulose Nanofibril Films Derived from Agricultural Wastes
2018Co-Authors: Fabiola Valdebenito, Gustavo Ciudad, Rafael García, Karen Cruces, Gary Chinga-carrasco, Youssef HabibiAbstract:The present work demonstrates a simple and straightforward chemical modification of cellulose nanofibril (CNF) films in order to produce CO2 adsorbent materials. The CNF films were obtained from two agricultural residues, i.e. Corn Husks and oat hulls. CNF from kraft pulp was used for comparison purposes. Controlled surface silylation was conducted on the preformed CNF films in aqueous media under mild conditions using three aminosilanes bearing mono, di, and triamine groups. The success of the grafting of the aminosilanes on the CNF films was demonstrated by Fourier transform infrared and X-ray photoelectron spectroscopy analyses. The results of the contact angle measurements and field emission scanning electron microscopy coupled with energy dispersive spectroscopy showed homogeneous coverage by the amino groups on the surface of the modified CNF films, particularly with the diaminosilane N-[3-(trimethoxysilyl)propyl]ethylenediamine (DAMO). The produced films were thermally stable, and when subjected to 99.9% CO2 flow at 25 °C, these modified films showed good adsorption of CO2. Indeed, after 3 h of exposure the adsorbed concentration of CO2 of the CNF films modified with DAMO was 0.90, 1.27, and 2.11 mmol CO2 g–1 polymer for CNF films from Corn Husks, oat hulls, and kraft pulp, respectively
-
on the nanofibrillation of Corn Husks and oat hulls fibres
Industrial Crops and Products, 2017Co-Authors: Fabiola Valdebenito, Miguel Pereira, Rodrigo Briones, Laura Azócar, Gustavo Ciudad, Gary ChingacarrascoAbstract:Abstract Cellulose nanofibrils (CNF) were isolated from agro-industrial waste (Corn Husks and oat hulls) and market kraft pulp fibres, and a detailed comparative study was performed. Initially, the raw materials were subjected to a conventional pulping process to remove lignin and hemicelluloses. The chemical pre-treatment was based on 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO)-mediated oxidation and the mechanical treatment was carried out with a high-pressure homogenizer. An extensive characterization of the raw material and of the nanofibrillated celluloses was performed, considering structural and chemical aspects. CNF films were produced for their characterization by optical methods, laser profilometry (LP), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Considering the same pulping and chemical pre-treatment, the analyses indicated that the oxidized Corn Husks fibres had higher carboxylate content and thus a larger tendency to nanofibrillate compared to the oat hulls fibres. The obtained content of carboxylic acids was directly proportional to the content of cellulose in the assessed samples, confirming the selectivity of the TEMPO-mediated oxidation. The fibrillated Corn Husks material had a minor fraction of residual fibres (
Y D Hang - One of the best experts on this subject based on the ideXlab platform.
-
enzymatic production of pentoses from the hemicellulose fraction of Corn residues
Lwt - Food Science and Technology, 2006Co-Authors: Kyung Young Yoon, E E Woodams, Y D HangAbstract:Abstract Three commercial xylanase preparations were evaluated as a sole enzyme source for the enzymatic production of pentoses from the hemicellulose fraction of Corn Husks and Corn cobs. The hemicellulose fraction was obtained by extracting Corn Husks or Corn cobs with 1.25 mol/l NaOH, and the alkaline extract was used as a substrate for enzymatic hydrolysis. Rapidase Pomaliq (Gist-brocades) was found to yield significantly more pentoses from Corn Husks and Corn conb than Clarex ML (Genenor) or Validase × (Valley Research). Rapidase Pomaliq was capable of increasing the concentration of pentoses from an initial value of 106.5 to 210.6 g/kg dry matter of Corn Husks or 8.6 to 141.6 g/kg dry matter of Corn cobs, respectively, under favorable conditions (480 min of reaction at pH 5.0 and 50 °C). Products of the enzymatic reaction were identified as arabinose, xylose, xylobiose, and xylotriose. The results of this study indicate that Rapidase Pomaliq, an enzyme preparation derived from Aspergillus niger and Trichoderma reesei , could serve as a sole enzyme source for the production of pentoses and xylooligosaccharides from Corn residues.
Scott A Shearer - One of the best experts on this subject based on the ideXlab platform.
-
effect of anatomical fractionation on the enzymatic hydrolysis of acid and alkaline pretreated Corn stover
Bioresource Technology, 2009Co-Authors: K B Duguid, Michael D Montross, C W Radtke, C L Crofcheck, L M Wendt, Scott A ShearerAbstract:Due to concerns with biomass collection systems and soil sustainability there are opportunities to investigate the optimal plant fractions to collect for conversion. An ideal feedstock would require a low severity pretreatment to release a maximum amount of sugar during enzymatic hydrolysis. Corn stover fractions were separated manually and analyzed for glucan, xylan, acid soluble lignin, acid insoluble lignin, and ash composition. The stover fractions were also pretreated with either 0%, 0.4%, or 0.8% NaOH for 2 h at room temperature, washed, autoclaved and saccharified. In addition, dilute sulfuric acid pretreated samples underwent simultaneous saccharification and fermentation (SSF) to ethanol. In general, the two pretreatments produced similar trends with cobs, Husks, and leaves responding best to the pretreatments, the tops of stalks responding slightly less, and the bottom of the stalks responding the least. For example, Corn Husks pretreated with 0.8% NaOH released over 90% (standard error of 3.8%) of the available glucan, while only 45% (standard error of 1.1%) of the glucan was produced from identically treated stalk bottoms. Estimates of the theoretical ethanol yield using acid pretreatment followed by SSF were 65% (standard error of 15.9%) for Husks and 29% (standard error of 1.8%) for stalk bottoms. This suggests that integration of biomass collection systems to remove sustainable feedstocks could be integrated with the processes within a biorefinery to minimize overall ethanol production costs.