Anderson De Almedia Guerra

Works (7)

Updated: July 5th, 2023 15:55

2008 journal article

Determination of arylglycerol-beta-aryl ether linkages in enzymatic mild acidolysis lignins (EMAL): Comparison of DFRC/P-31 NMR with thioacidolysis

JOURNAL OF NATURAL PRODUCTS, 71(5), 836–841.

By: A. Guerra n, M. Norambuena n, J. Freer n & D. Argyropoulos n 

MeSH headings : Ethers / chemistry; Eucalyptus / chemistry; Lignin / analysis; Lignin / chemistry; Lignin / isolation & purification; Magnetic Resonance Spectroscopy / methods; Molecular Structure; Stereoisomerism; Wood / chemistry
TL;DR: Thioacidolysis and DFRC/(31)P NMR were further used to better understand the lignin isolation process from wood, and the results show that mild rotary ball milling minimizes the degradation of beta-O-4 structures during the early stages of wood pulverization. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2008 journal article

Propensity of Lignin to Associate: Light Scattering Photometry Study with Native Lignins

BIOMACROMOLECULES, 9(12), 3362–3369.

By: S. Contreras n, A. Gaspar n, A. Guerra n, L. Lucia n  & D. Argyropoulos n 

MeSH headings : Eucalyptus / chemistry; Hydrogen Bonding; Light; Lignin / chemistry; Lignin / isolation & purification; Molecular Weight; Photometry; Picea / chemistry; Scattering, Radiation; Solubility; Solutions; Solvents / chemistry
TL;DR: The challenges and opportunities of measuring the specific refractive index increment (dn/dC) of lignin solutions and determining the kinetics of the dissociation process were investigated and insight is offered into the aggregation and ensuing dissociative events that operate within the lignIn macromolecules. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2007 journal article

Isolation and characterization of lignins from Eucalyptus grandis Hill ex Maiden and Eucalyptus globulus Labill. by enzymatic mild acidolysis (EMAL)

HOLZFORSCHUNG, 62(1), 24–30.

By: A. Guerra n, L. Lucia n  & D. Argyropoulos n 

author keywords: derivatization followed by reductive cleavage (DFRC); enzymatic mild acidolysis lignin (EMAL); Eucalyptus; lignin; milled wood lignin (MWL); P-31 nuclear magnetic resonance spectroscopy
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2007 journal article

On the propensity of lignin to associate: A size exclusion chromatography study with lignin derivatives isolated from different plant species

PHYTOCHEMISTRY, 68(20), 2570–2583.

By: A. Guerra n, A. Gaspar n, S. Contreras n, L. Lucia n , C. Crestini * & D. ArgyropouloS n 

author keywords: enzymatic mild acidolysis lignin; milled wood lignin; association; aggregation; lignin; southern pine; Pinus palustris; Norway spruce; Picea abies; douglas fir; Pseudotsuga menziesi; white fir; Abies concolor; Pinaceae; redwood; Sequoia sempervirens; Taxodiaceae; Eucalyptus globulus; myrtaceae; wheat Triticum aestivton; gramineae
MeSH headings : Chromatography, Gel; Lignin / analogs & derivatives; Lignin / isolation & purification; Magnetic Resonance Spectroscopy; Magnoliopsida / chemistry; Molecular Weight; Species Specificity; Tracheophyta / chemistry
TL;DR: Lignin solutions incubated at 4 degrees C showed an associative behaviour manifested by an increase in the weight and number average molecular weights for some species, and lignins from softwoods were found to associate/dissociate to a greater extent than lignin from E. globulus and straw. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2006 journal article

Comparative evaluation of three lignin isolation protocols for various wood species

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 54(26), 9696–9705.

By: A. Guerra n, I. Filpponen  n, L. Lucia n  & D. Argyropoulos n 

author keywords: EMAL; MWL; CEL; DFRC; P-31 NMR; ball milling; lignin; southern pine; Douglas fir; white fir; redwood; Eucalyptus globulus; compression wood
MeSH headings : Abies / chemistry; Eucalyptus / chemistry; Hydrogen-Ion Concentration; Lignin / chemistry; Lignin / isolation & purification; Magnetic Resonance Spectroscopy; Molecular Weight; Pinus / chemistry; Pseudotsuga / chemistry; Sequoia / chemistry; Species Specificity; Wood / chemistry
TL;DR: Molecular weight analyses showed that the EMAL protocol isolates lignin fractions that are not accessed by the other procedures evaluated, while 31P NMR spectroscopy revealed that MWL is more condensed and bears more phenolic hydroxyl groups than EMAL and CEL. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2006 journal article

Spectral monitoring of the formation and degradation of polysulfide ions in alkaline conditions

INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 45(22), 7388–7392.

By: I. Filpponen  n, A. Guerra n, A. Hai  n, n. Lucia  n & D. Argyropoulos n 

UN Sustainable Development Goal Categories
13. Climate Action (Web of Science)
14. Life Below Water (Web of Science)
15. Life on Land (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2006 journal article

Toward a better understanding of the lignin isolation process from wood

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY, 54(16), 5939–5947.

By: A. Guerra n, I. Filpponen  n, L. Lucia n , C. Saquing n, S. Baumberger  n & D. Argyropoulos n 

author keywords: enzymatic mild acidolysis lignin; MWL; CEL; DFRC; P-31 NMR; spruce; vibratory milling; ball milling; lignin
MeSH headings : Carbohydrates / chemistry; Cellulases; Ethers / analysis; Hydrogen-Ion Concentration; Lignin / chemistry; Lignin / isolation & purification; Magnetic Resonance Spectroscopy; Molecular Weight; Polymers / chemistry; Vibration; Wood
TL;DR: The recently developed protocol for isolating enzymatic mild acidolysis lignins (EMAL) coupled with the novel combination of derivatization followed by reductive cleavage (DFRC) and quantitative (31)P NMR spectroscopy were used to better understand the lignin isolation process from wood. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

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