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44 results on '"Houtman, Carl J."'

6. Jet cooking dramatically improves the wet strength of soy adhesives.

Author

Hunt, Christopher G., Lorenz, Linda F., Houtman, Carl J., Valle, Eder, Coolidge, Thomas, Mock, Chera, and Frihart, Charles R.

Subjects
ADHESIVES, SOY proteins, SOY flour, SHEAR strength, COOKING, DENATURATION of proteins
Abstract

The impact of jet cooking on shear strength of soy‐and‐water adhesives was investigated to understand the higher shear strength of commercial soy protein isolates compared to soy flours. Soy flour‐based wood adhesives are appealing because of their bio‐based content, low formaldehyde emission, and low cost, but their commercial application is limited by low wet cohesive strength. Previous researchers proposed that the process of jet cooking (steam injection with high turbulence followed by rapid cooling) was responsible for the high (~3 MPa) wet shear strength of adhesives made with commercially produced soy protein isolate, using the ASTM D 7998 test. In this work, we show that jet cooking did dramatically increase the wet strength of laboratory‐produced, native‐state soy protein isolate from 0.6 to 3 MPa, a strength similar to many commercial isolates. Jet cooking was far less effective at developing wet strength of soy flours, but greatly increased the viscosity of virtually all our soy materials. We hypothesize that the benefits of jet cooking are primarily a result of nonequilibrium protein aggregation states because subsequent wet autoclaving of jet cooked soy proteins dramatically decreased wet strength. The dramatic differences in adhesive properties between commercial soy protein isolates and soy flours suggests that the common practice of using results obtained with commercial isolates to predict the performance of soy flour adhesives is inappropriate. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Additional file 1 of The characteristics of insoluble softwood substrates affect fungal morphology, secretome composition, and hydrolytic efficiency of enzymes produced by Trichoderma reesei

Author

Novy, Vera, Nielsen, Fredrik, Cullen, Daniel, Sabat, Grzegorz, Houtman, Carl J., and Hunt, Christopher G.

Abstract

Additional file 1. Supplementary information containing Supplementary Methods S1 to S5, Supplementary Tables S1 and S2, and Supplementary Figures S1 to S3.

Published
2021
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13. Pathways for extracellular Fenton chemistry in the brown rot basidiomycete Gloeophyllum trabeum

Author

Jensen, Kenneth A., Jr., Houtman, Carl J., Ryan, Zachary C., and Hammel, Kenneth E.

Subjects
Wood-decaying fungi -- Research, Biological sciences
Abstract

Both 2,5-dimethoxy-1,4-benzoquinone and 4,5-dimethoxy-1,2-benzoquinone participate in the extracellular hydroquinone-quinone redox cycle in Gloeophyllum trabeum that reduces Fe(super 3+) and generates hydrogen peroxide. The hydroxyl radical is believed to be one of the oxidants that brown rot fungi use to degrade wood polymers.

Published
2001

17. Laccase and its role in production of extracellular reactive oxygen species during wood decay by the brown rot basidiomycete Postia placenta

Author

Dongsheng Wei, Houtman, Carl J., Kapich, Alexander N., Hunt, Christopher G., Cullen, Daniel, and Hammel, Kenneth E.

Subjects
Basidiomycota -- Physiological aspects, Basidiomycota -- Genetic aspects, Hydroquinone -- Chemical properties, Oxalates -- Chemical properties, Oxygen -- Chemical properties, Biological sciences
Abstract

A study was conducted to demonstrate that aspen wood undergoing decay by the oxalate producer basidiomycetes Postia placenta contained both 2,5-dimethoxyhydroquinone and laccase activity. The estimated quantify of reactive oxygen species produced by P. placenta laccase in wood which large enough possibly contributed to incipient decay.

Published
2010

19. Characterizing the distribution of nonylphenol ethoxylate surfactants in water-based pressure-sensitive adhesive films using atomic-force and confocal Raman Microscopy

Author

Xu, Guizhen H., Jinping Dong, Jiguang Zhang, Severtson, Steven J., Houtman, Carl J., and Gwin, Larry E.

Subjects
Phenols -- Chemical properties, Phenols -- Electric properties, Surface active agents -- Chemical properties, Surface active agents -- Electric properties, Chemicals, plastics and rubber industries
Abstract

Combination of atomic force microscopy (AFM) and confocal Raman microscopy (CRM) were used to study the surfactant distributions in model pressure-sensitive adhesive (PSA) films. The results showed that CRM acts as powerful compliments to AFM in characterizing the distribution of surfactant species in PSA film formation.

Published
2008

20. Increasing the revenue from lignocellulosic biomass: Maximizing feedstock utilization

Author

Alonso, David Martin, primary, Hakim, Sikander H., additional, Zhou, Shengfei, additional, Won, Wangyun, additional, Hosseinaei, Omid, additional, Tao, Jingming, additional, Garcia-Negron, Valerie, additional, Motagamwala, Ali Hussain, additional, Mellmer, Max A., additional, Huang, Kefeng, additional, Houtman, Carl J., additional, Labbé, Nicole, additional, Harper, David P., additional, Maravelias, Christos T., additional, Runge, Troy, additional, and Dumesic, James A., additional

Published
2017
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43. Semi-Synthetic PSA Generated from Acrylated Biomass.

Author

Lander, Monique Roerdink, Jiguang Zhang, Severtson, Steven J., and Houtman, Carl J.

Subjects
BIOMASS, PRESSURE-sensitive adhesives, RAW materials, POLYMERIZATION, CONSUMER goods, SUSTAINABILITY
Abstract

The article focuses on how the introduction of biomass as a substitute for petroleum-based raw materials contributed in the development of sustainable products. It states that consumer goods made from renewable materials are needed to minimize the use of fossil resources. It notes that the conventional emulsion polymerization approach is demonstrated through the generation of several pressure-sensitive adhesive (PSA) latexes produced with acrylated biomass and 2-ethylhexyl acrylate.

Published
2011

44. Regulation of Gene Expression during the Onset of Ligninolytic Oxidation by Phanerochaete chrysosporium on Spruce Wood.

Author

Korripally, Premsagar, Hunt, Christopher G., Houtman, Carl J., Jones, Don C., Kitin, Peter J., Cullen, Dan, and Hammel, Kenneth E.

Subjects
*GENE expression, *OXIDATION, *PHANEROCHAETE chrysosporium, *CONFOCAL fluorescence microscopy, *REACTIVE oxygen species, *LIPID peroxidation (Biology)
Abstract

Since uncertainty remains about how white rot fungi oxidize and degrade lignin in wood, it would be useful to monitor changes in fungal gene expression during the onset of ligninolysis on a natural substrate. We grew Phanerochaete chrysosporium on solid spruce wood and included oxidant-sensing beads bearing the fluorometric dye BODIPY 581/591 in the cultures. Confocal fluorescence microscopy of the beads showed that extracellular oxidation commenced 2 to 3 days after inoculation, coincident with cessation of fungal growth. Whole transcriptome shotgun sequencing (RNA-seq) analyses based on the v.2.2 P. chrysosporium genome identified 356 genes whose transcripts accumulated to relatively high levels at 96 h and were at least four times the levels found at 40 h. Transcripts encoding some lignin peroxidases, manganese peroxidases, and auxiliary enzymes thought to support their activity showed marked apparent upregulation. The data were also consistent with the production of ligninolytic extracellular reactive oxygen species by the action of manganese peroxidase-catalyzed lipid peroxidation, cellobiose dehydrogenase-catalyzed Fe3+ reduction, and oxidase-catalyzed H2O2 production, but the data do not support a role for iron-chelating glycopeptides. In addition, transcripts encoding a variety of proteins with possible roles in lignin fragment uptake and processing, including 27 likely transporters and 18 cytochrome P450s, became more abundant after the onset of extracellular oxidation. Genes encoding cellulases showed little apparent upregulation and thus may be expressed constitutively. Transcripts corresponding to 165 genes of unknown function accumulated more than 4-fold after oxidation commenced, and some of them may merit investigation as possible contributors to ligninolysis. [ABSTRACT FROM AUTHOR]

Published
2015
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