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( Adriana M. Rangel-rodriguez ),( J. Adriana Sañudo-barajas ),( Nagamani Balagurusamy ),( Louise Wicker ),( Rosabel Velez-de-la-rocha ),( Juan Carlos Contreras-esquivel ) 한국키틴키토산학회 2018 한국키틴키토산학회지 Vol.23 No.2
In this work, the preparation and characterization of water-soluble polysaccharides from chitosan and Aloe vera was studied. The water-soluble polysaccharides were used to study polyelectrolyte complexes. The reaction time effect for chitosan hydrolysis by endo-chitosanase was studied at 40ºC and pH 5.00 to produce water soluble chitosan (WSCh). The physico-chemical characteristics of chitosan hydrolysates, water-soluble A. vera polysaccharides and polyelectrolyte complexes were determined. After 3 h of chitosan processing, a viscosity reduction of 90%, while only 2.3% of reducing sugars were released. A WSCh was recover by ultrafiltration (1 kDa) from chitosan hydrolysate after 12 h and was spray-dried with a yield of 9.7%. Cold-water extraction of A. vera mucilage from pulp gives a crude polysaccharide yield of 0.81 g/kg (wet basis) based on whole leaf weight. The water isolated mucilage is composed of a mixture of protein and mannan rich-polysaccharide. The results show WSCh’s association capacity with A. vera mucilage by electrostatic interaction.
Enhancement of NOx photo-oxidation by Fe-doped TiO2 nanoparticles
Adriana Martinez-Oviedo,Schindra Kumar Ray,Gobinda Gyawali,Vicente Rodriguez-Gonzalez,Soo Wohn Lee 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3
Microwave hydrothermal-assisted sol-gel method was employed to synthesize the Fe doped TiO2 photocatalyst. Themorphological analysis suggests anatase phase nanoparticles of ~20 nm with an SBET area of 283.99 m2/g. The doping of Feions in TiO2 created oxygen vacancies and Ti3+ species as revealed through the XPS analysis. The reduction of the band gap(3.1 to 2.8 eV) is occurred by doping effect. The as-prepared photocatalyst was applied for removal of NOx under solar lightirradiation. The doping of Fe in TiO2 facilitates 75 % of NOx oxidation efficiency which is more than two-fold enhancementthan the TiO2 photocatalyst. The possible reason of enhancement is associated with high surface area, oxygen vacancy, andreduction of the band gap. Also, the low production of toxic intermediates, NO2 gas, is further confirmed by Combustion IonChromatography. The mechanism related NOx oxidation by the doped photocatalyst is explained in this study.
Hypocholesterolemia in Patients with an Amebic Liver Abscess
( Maria S Flores ),( Adriana Obregon Cardenas ),( Eva Tamez ),( Elba Rodriguez ),( Katiushka Arevalo ),( Isela Quintero ),( Rolando Tijerina ),( Francisco Bosques ),( Luis Galan ) 대한소화기학회 2014 Gut and Liver Vol.8 No.4
Background/Aims: Many parasites induce changes in the lipid profiles of the host. Cholesterol increases the virulence of Entamoeba histolytica in animal models and in vitro culture. This study aimed to determine, in patients with an amebic liver abscess, the correlation between cholesterol and other features, such as the size and number of abscesses, standard hematological and serum chemistry profiles, liver tests, and duration of hospital stay. Methods: A total of 108 patients with an amebic liver abscess and 140 clinically healthy volunteers were investigated. Cholesterol and triglycerides were measured in the sera. The data from medical observations and laboratory tests were obtained from the clinical records. Results: A total of 93% of patients with an amebic liver abscess showed hypocholesterolemia not related to any of the studied parameters. Liver function tests correlated with the size of the abscess. The most severe cases of amebic liver disease or death were found in patients whose cholesterol levels continued to decrease despite receiving antiamebic treatment and hospital care. Conclusions: Our results show that the hypocholesterolemia observed in patients with an amebic liver abscess is not related to any of the clinical and laboratory features analyzed. This is the first study relating hypocholesterolemia to severity of hepatic amebiasis. (Gut Liver 2014;8:415-420)
Screening of Industrial Enzymes for Deproteinization of Shrimp Head for Chitin Recovery
Angel U. Valdez-Peña,Adriana Hernandez-Rivera,Iliana M. De-la-Garza-Rodriguez,Judith D. Espinoza-Perez,Georgina C. Sandoval-Fabian,Nagamani Balagurusamy,Juan Carlos Contreras-Esquivel 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.2
Food grade proteolytic enzymes were examined for deproteinization of shrimp head. Shrimp head was easily deproteinized by Alcalase® and trypsin at a pH of 8.0. Alcalase was chosen as the most efficient commercial enzyme for deproteinization of shrimp head. Alcalase treatment of shrimp head recorded 61% of weight loss on dry basis and a residual protein of 275 mg/g dried shrimp head. The enzymatically deproteinized shrimp head was later demineralized with lactic acid using microwave radiation at 400W. The combination of enzymatic and physicochemical treatments promoted the chitin recovery from dried shrimp head under eco-friendly conditions.
Florencia Anabel Mesas,Marí,a Cecilia Terrile,Marí,a Ximena Silveyra,Adriana Zuñ,iga,Marí,a Susana Rodriguez,Claudia Anahí,Casalongué,Julieta René,e Mendieta 한국식물병리학회 2021 Plant Pathology Journal Vol.37 No.6
Chitosan has been considered an environmental-friend- ly polymer. However, its use in agriculture has not been extended yet due to its relatively low solubility in water. N-Methylene phosphonic chitosan (NMPC) is a water- soluble derivative prepared by adding a phosphonic group to chitosan. This study demonstrates that NMPC has a fungicidal effect on the phytopathogenic fungus Fusarium solani f. sp. eumartii (F. eumartii) judged by the inhibition of F. eumartti mycelial growth and spore germination. NMPC affected fungal membrane per- meability, reactive oxygen species production, and cell death. Also, this chitosan-derivative exerted antifungal effects against two other phytopathogens, Botrytis cine- rea, and Phytophthora infestans. NMPC did not affect tomato cell viability at the same doses applied to these phytopathogens to exert fungicide action. In addition to water solubility, the selective biological cytotoxicity of NMPC adds value in its application as an antimicrobial agent in agriculture.