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United States Department of Agriculture

Agricultural Research Service

Gary A. Luzio

Research Chemist


Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Characterization of molecular structural changes in pectin during juice cloud destabilization in frozen concentrated orange juice - (Peer Reviewed Journal)
Galant, A.L., Widmer, W.W., Luzio, G.A., Cameron, R.G. 2014. Characterization of molecular structural changes in pectin during juice cloud destabilization in frozen concentrated orange juice. Food Hydrocolloids Journal. 41:10-18.
Characterization of Charged Functional Domains Introduced into a Modified Pectic Homogalacturonan by an Acidic Plant Pectin Methylesterase (Ficus awkeotsang Makino) and Modeling of Enzyme Mode of Action Food Hydrocolloids Reprint Icon - (Peer Reviewed Journal)
Kim, Y., Williams, M.A., Tzen, J.T., Luzio, G.A., Galant, A.L., Cameron, R.G. 2014. Characterization of Charged Functional Domains Introduced into a Modified Pectic Homogalacturonan by an Acidic Plant Pectin Methylesterase (Ficus awkeotsang Makino) and Modeling of Enzyme Mode of Action Food Hydrocolloids. Food Hydrocolloids Journal. 39:319-329.
Compositional and Structural Characterization of Pectic Material from Frozen Concentrated Orange Juice - (Peer Reviewed Journal)
Galant, A.L., Luzio, G.A., Widmer, W.W., Cameron, R.G. 2014. Compositional and Structural Characterization of Pectic Material from Frozen Concentrated Orange Juice. Food Hydrocolloids Journal. 35:661-669.
Formation of stylet sheaths in aere (in air) from eight species of phytophagous hemipterans from six families (suborders: Auchenorrhyncha and Sternorrhyncha) - (Peer Reviewed Journal)
Morgan, J.K., Luzio, G.A., Ammar, E., Hunter, W.B., Hall, D.G., Shatters, R.G. 2013. Formation of stylet sheaths in aere (in air) from eight species of phytophagous hemipterans from six families (suborders: Auchenorrhyncha and Sternorrhyncha). PLoS ONE. 8(4):e62444.
Nanostructural modification of a model homogalacturonan with a novel pectin methylesterase: Effects of pH on nanostructure, enzyme mode of action and substrate functionality - (Peer Reviewed Journal)
Kim, Y., Williams, M.A., Galant, A.L., Luzio, G.A., Savary, B., Vasu, P., Cameron, R.G. 2013. Nanostructural modification of a model homogalacturonan with a novel pectin methylesterase: Effects of pH on nanostructure, enzyme mode of action and substrate functionality. Food Hydrocolloids Journal. 33:132-141.
Effect of Extraction, Pasteurization and Cold Storage on Flavonoids and other Secondary Metabolites in Fresh Orange Juice - (Peer Reviewed Journal)
Bai, J., Ford, B.L., Manthey, J.A., Luzio, G.A., Cameron, R.G., Narciso, J.A., Baldwin, E.A. 2013. Effect of Extraction, Pasteurization and Cold Storage on Flavonoids and other Secondary Metabolites in Fresh Orange Juice. Journal of the Science of Food and Agriculture. 93:2771-2781.
Determination of Degree of Methylation of Food Pectins by Chromatography - (Peer Reviewed Journal)
Luzio, G.A., Cameron, R.G. 2013. Determination of Degree of Methylation of Food Pectins by Chromatography. Journal of the Science of Food and Agriculture. 93:2463-2469.
Studies of in aere formed stylet sheath from the Asian citrus psyllid (Diaphorina citri, Hemiptera: Psyllidae) and other phytophagous Hemiptera - (Abstract Only)
Morgan, J.K., Shatters, R.G., Luzio, G.A., Ammar, E., Alessandro, R.T., Hunter, W.B. 2012. Compositional and biosynthetic studies of the stylet sheath from the Asian citrus psyllid (Diaphorina citri, Hemiptera: Psyllidae)[abstract]. 60th Annual Meeting of the Entomological Society of America, November 11-14, 2012, Knoxville, Tennessee.
Extraction and recovery of pectic fragments from citrus processing waste for co-production with ethanol - (Peer Reviewed Journal)
Grohmann, K., Cameron, R.G., Kim, Y., Widmer, W.W., Luzio, G.A. 2012. Extraction and recovery of pectic fragments from citrus processing waste for co-production with ethanol. Journal of Chemical Technology & Biotechnology. DOI: 10.1002/jctb.3859.
Characterization of Pectin from Citrus sinensis (Sweet Orange) Juice - (Abstract Only) - (01-Apr-12)
Mapping structural and functional changes in esterase-treated pectin and characterizing enzyme mode of action - (Abstract Only) - (27-Mar-12)
Effect of extraction method on quality of orange juice: hand-squeezed, commercial-fresh squeezed and processed - (Peer Reviewed Journal)
Baldwin, E.A., Bai, J., Plotto, A., Cameron, R.G., Luzio, G.A., Narciso, J.A., Manthey, J.A., Widmer, W.W., Ford, B.L. 2012. Effect of extraction method on quality of orange juice: hand-squeezed, commercial-fresh squeezed and processed. Journal of the Science of Food and Agriculture. 92:2029-2042.
Enzymatic modification of a model homogalacturonan with the thermally tolerant pectin methylesterase from citrus: I. Nanostructural characterization, enzyme mode of action and effect of pH - (Peer Reviewed Journal)
Cameron, R.G., Luzio, G.A., Vasu, P., Savary, B.J., Williams, M.A.K. 2011. Enzymatic modification of a model homogalacturonan with the thermally tolerant pectin methylesterase from citrus: I. Nanostructural characterization, enzyme mode of action and effect of pH. Journal of Agricultural and Food Chemistry. 59:2717-2724.
Contactless conductivity: an HPLC method to analyze degree of methylation of pectin - (Peer Reviewed Journal)
Luzio, G.A., Cameron, R. 2010. Contactless conductivity: an HPLC method to analyze degree of methylation of pectin. Proceedings of Florida State Horticultural Society. 123:213-216.
A comparison of processed and fresh squeezed ‘Hamlin’ orange juice - flavor quality - (Proceedings)
Bai, J., Baldwin, E., Plotto, A., Cameron, R., Ford, B.L., Luzio, G., Manthey, J., Narciso, J., Dea, S. 2010. A comparison of processed and fresh squeezed ‘Hamlin’ orange juice - flavor quality. Proceedings of Florida State Horticultural Society. 123:199-206.
Effect of HLB on flavor of orange juice and perception of limonin and nomilin - (Abstract Only) - (30-Nov-10)
Pectin: Affect on structural and functional properties by enzyme or chemical modification - (Abstract Only) - (16-Oct-10)
Mapping structural and functional changes in esterase-treated pectin and characterizing enzyme mode of action - (Abstract Only) - (16-Oct-10)
Quality characteristics of freshly squeezed orange juice in comparison to commercial products - (Abstract Only) - (16-Oct-10)
A comparison of commercially processed and fresh squeezed juice: nutrients and phytonutrients - (Abstract Only) - (23-Mar-10)
Contactless conductivity detector for determination of degree of esterification of citrus pectin - (Abstract Only) - (22-Feb-10)
Effect of Huanglongbing (HLB) disease on orange juice flavor - (Abstract Only) - (10-Feb-10)
Effect of Liberibacter infection (Huanglongbing disease) of citrus on orange fruit physiology and fruit/fruit juice quality: chemical and physical analyses - (Peer Reviewed Journal)
Baldwin, E., Plotto, A., Manthey, J., Mccollum, G., Bai, J., Irey, M., Cameron, R., Luzio, G. 2010. Effect of Liberibacter infection (Huanglongbing disease) of citrus on orange fruit physiology and fruit/fruit juice quality: chemical and physical analyses. Journal of Agricultural and Food Chemistry. 58:1247-1262.
Digestion patterns of two commercial endopolygalacturonases on polygalacturonate oligomers with a degree of polymerization of 7 – 21 - (Peer Reviewed Journal)
Cameron, R.G., Luzio, G.A., Savary, B.J., Nunez, A., Goodner, K. 2009. Digestion patterns of two commercial endopolygalacturonases on polygalacturonate oligomers with a degree of polymerization of 7 – 21. Proceedings of Florida State Horticultural Society. 122:295-302.
Functional characterization of citrus pectin modified with a thermally tolerant pectin methylesterase - (Abstract Only)
Luzio, G., Cameron, R.G. 2009. Functional characterization of citrus pectin modified with a thermally tolerant pectin methylesterase. Subtropical Technology Conference Proceedings. 60:16.
Nanostructural characterization of enzymatically modified pectin - (Abstract Only)
Cameron, R., Luzio, G., Savery, B., Vasu, P., Williams, M. 2009. Nanostructural characterization of enzymatically modified pectin. Subtropical Technology Conference Proceedings. 60:15.
Effect of seasonal variation on quality of ‘Valencia’ orange - (Abstract Only)
Bai, J., Baldwin, E., Plotto, A., Manthey, J., Mccollum, T., Irey, M., Luzio, G. 2009. Effect of seasonal variation on quality of ‘Valencia’ orange. Subtropical Technology Conference Proceedings. 60:18-19.
Influence of harvest time on quality of ‘Valencia’ oranges and juice - (Proceedings)
Bai, J., Baldwin, E.A., Plotto, A., Manthey, J.A., Mccollum, T.G., Irey, M., Luzio, G.A. 2009. Influence of harvest time on quality of ‘Valencia’ oranges and juice. Proceedings of Florida State Horticultural Society. 122: 308-315.
Digestion patterns of two commercial endopolygalacturonases on polygalacturonate oligomers with a degree of polymerization from 7–21 - (Abstract Only)
Cameron, R.G., Goodner, K., Luzio, G.A., Savary, B.J. 2009. Digestion patterns of two commercial endopolygalacturonases on polygalacturonate oligomers with a degree of polymerization from 7–21. Florida State Horticultural Society Meeting. Paper No. HP1.
Microwave release ofpectin from orange peel albedo using a closed vessel reactor system - (Peer Reviewed Journal)
Luzio, G.A. 2008. Microwave release of pectin from orange peel albedo using a closed vessel reactor system. Proceedings of Florida State Horticultural Society. 121:315-319.
Biosorption properties of citrus peel derived oligogalacturonides, enzyme-modified pectin and peel hydrolysis residues - (Peer Reviewed Journal)
Cameron, R.G., Luzio, G.A., Widmer, W.W., Iqbal, M. 2008. Biosorption properties of citrus peel derived oligogalacturonides, enzyme-modified pectin and peel hydrolysis residues. Proceedings of Florida State Horticultural Society. 121:311-314.
Healthful and nutritional components in select Florida tropical fruits - (Proceedings)
Baldwin, E., Manthey, J., Luzio, G., Goodner, K., Plotto, A., Mahattanatawee, K., Gmitter, F. 2009. Healthful and nutritional components in select Florida tropical fruits. Proceedings of the Tropical Fruits in Human Nutrition and Health Conference. 2008:60-66.
Accelerated extraction of pectin from orange citrus albedo using focused microwaves - (Abstract Only)
Luzio, G.A. 2008. Accelerated extraction of pectin from orange citrus albedo using focused microwaves. Subtropical Technology Conference Proceedings. 59:28.
Biosorption properties of citrus peel derived oligogalacturonides, enzyme-modified pectin and peel hydrolysis residues - (Abstract Only)
Cameron, R.G., Luzio, G.A., Widmer, W.W. 2008. Biosorption properties of citrus peel derived oligogalacturonides, enzyme-modified pectin and peel hydrolysis residues. Florida State Horticultural Society Meeting. Paper No. HP23.
Microwave extraction of citrus peel to release pectin - (Abstract Only)
Luzio, G.A. 2008. Microwave extraction of citrus peel to release pectin using a closed vessel reactor. Florida State Horticultural Society Meeting. Paper No. HP24.
Rheological investigation of pectin deesterified using salt-independent pectin methylesterase from citrus - (Peer Reviewed Journal)
Luzio, G.A., Cameron, R.G. 2007. Rheological investigation of pectin deesterified using salt-independent pectin methylesterase from citrus. Proceedings of Florida State Horticultural Society. 120:304-309.
Suspension properties of pectins deesterified using pectin methylesterase - (Abstract Only)
Luzio, G.A., Cameron, R.G. 2007. Suspension properties of pectins deesterified using pectin methylesterase. Subtropical Technology Conference Proceedings. 58:20.
Ion binding capacity of enzyme modified citrus peel and pectin - (Abstract Only)
Cameron, R.G., Luzio, G.A., Widmer, W.W., Iqbal, M. 2007. Ion binding capacity of enzyme modified citrus peel and pectin. Subtropical Technology Conference Proceedings. 58:19.
Demethylation of a model homogalacturonan with a citrus salt-independent pectin methylesterase: Effect of pH on block size and number, enzyme mode of action and resulting functionality - (Peer Reviewed Journal)
Cameron, R.G., Luzio, G.A., Goodner, K.L., Williams, M.A. 2008. Demethylation of a model homogalacturonan with a citrus salt-independent pectin methylesterase: Effect of pH on block size and number, enzyme mode of action and resulting functionality. Gums and Stablisers for the Food Industry. 14:141-152.
Demethylation of a model homogalacturonan with the salt-independent pectin methylesterase from citrus: I. effect of pH on demethylated block size and distribution - (Peer Reviewed Journal)
Cameron, R.G., Goodner, K.L., Luzio, G.A., Williams, M.K. 2008. Demethylation of a model homogalacturonan with the salt-independent pectin methylesterase from citrus: I. Effect of pH on demethylated block size and distribution. Carbohydrate Polymers. 70:287-299.
Demethylation of a model homogalacturonan with the salt-independent pectin methylesterase from citrus: II. structure function analysis - (Peer Reviewed Journal)
Luzio, G.A., Cameron, R.G. 2008. Demethylation of a model homogalacturonan with the salt-independent pectin methylesterase from citrus: Part II. Structure-function analysis. Carbohydrate Polymers. 71:300-309.
Demethylation of a model homogalacturonan with a citrus salt-independent pectin methylesterase: Effect of pH on block size and number and resulting functionality - (Abstract Only)
Luzio, G.A., Cameron, R.G. 2007. Demethylation of a model homogalacturonan with a citrus salt-independent pectin methylesterase: Effect of pH on block size and number and resulting functionality. National Meeting of Institute of Food Technologists/Food Expo. Presentation No. 137-03.
Functional analysis of block deesterified citrus pectins - (Abstract Only)
Luzio, G., Cameron, R. 2007. Functional analysis of block deesterified citrus pectins. Florida State Horticultural Society Meeting. Abstract No. HP21.
Demethylation of a model homogalacturonan with a citrus salt-independent pectin methylesterase: effect of pH on block size and number, enzyme mode of action and resulting functionality - (Abstract Only) - (26-Dec-06)
Functional properties of pectin after treatment qith an orange pectin methylesterase - (Abstract Only)
Luzio, G.A., Cameron, R.G. 2006. Functional properties of pectin after treatment qith an orange pectin methylesterase. Subtropical Technology Conference Proceedings. 57:16.
Citrus salt-independent pectin methylesterase demethylation of a model homogalacturonan: effect of pH on demethylated block size and distribution - (Abstract Only)
Cameron, R.G., Goodner, K.L., Luzio, G.A. 2006. Citrus salt-independent pectin methylesterase demethylation of a model homogalacturonan: effect of pH on demethylated block size and distribution. Subtropical Technology Conference Proceedings. 57:15.
Hpaec Coupled to An Evaporative Light Scattering Detector for Separation, Detection and Quantification of Galacturonic Acid Oligomers - (Abstract Only) - (20-Jul-06)
Total antioxidant activity and fiber content of select Florida-grown tropical fruits Reprint Icon - (Peer Reviewed Journal)
Mahattanatawee, K., Manthey, J.A., Luzio, G., Talcott, S.T., Goodner, K.L., Baldwin, E.A. 2006. Total antioxidant activity and fiber content of select Florida-grown tropical fruits. Journal of Agricultural and Food Chemistry. 54:7355-7363.
Antioxidant, Fiber and Phenolic Content of Select Tropical Fruits Grown in Florida - (Abstract Only) - (20-Jun-06)
Functional and Rheological Properties of Highly Esterified Pectin after Treatment with An Orange Pectin Methylesterase - (Abstract Only)
Luzio, G.A., Cameron, R.G. 2006. Functional and rheological properties of highly esterified pectin after treatment with an orange pectin methylesterase. National Meeting of Institute of Food Technologists/Food Expo. Abstract No. 014-06.
Structural Characterization of Pectin Following Demethylation with a Salt-Independent Pectin Methylesterase - (Abstract Only)
Cameron, R.G., Goodner, K.L., Luzio, G.A. 2006. Structural characterization of pectin following demethylation with a salt-independent pectin methylesterase. National Meeting of Institute of Food Technologists/Food Expo. Abstract No. 014-03.
Determination of Molecular Weight Citrus Pectin Using Ion Chromatography - (Abstract Only)
Luzio, G.A. 2006. Determination of molecular weight citrus pectin using ion chromatography. Florida State Horticultural Society Meeting. Paper No. 56.
Nutritional Components in Select Florida Tropical Fruits - (Abstract Only)
Mahattanatawee, K., Baldwin, E., Goodner, K., Manthey, J., Luzio, G. 2006. Nutritional components in select Florida tropical fruits. HortScience. 40(3):504.
Production of Narrow-Range Size-Classes of Polygalacturonic Acid Oligomers Reprint Icon - (Peer Reviewed Journal)
Cameron, R.G., Luzio, G.A., Baldwin, E.A., Narciso, J.A., Plotto, A. 2006. Production of narrow-range size-classes of polygalacturonic acid oligomers. Proceedings of Florida State Horticultural Society. 118:406-409.
Effect of Ph on De-Esterified and Methyl-Protected Block Size in Pectin Treated with the Salt-Independent Pectin Methylesterase from Citrus Fruit - (Abstract Only)
Cameron, R.G., Luzio, G.A. 2006. Effect of pH on de-esterified and methyl-protected block size in pectin treated with the salt-independent pectin methylesterase from citrus fruit. Pacifichem Symposium. Paper No. 22.
Evaporative Light Scattering Detector As a Mass Detector with Malls for Determination of Pectin Molecular Weight - (Abstract Only) - (15-Oct-05)
Rheological Properties of Non-Calcium Sensitive Pectin after Treatment with the Citrus Salt Independent Pectin Methylesterase - (Abstract Only)
Luzio, G.A., Cameron, R.G. 2006. Rheological properties of non-calcium sensitive pectin after treatment with the citrus salt independent pectin methylesterase. Pacifichem Symposium. Paper No. 23.
Use of An Evaporative Light Scattering Detector Coupled to Malls for Determination of Polysaccharide Molecular Weight Reprint Icon - (Peer Reviewed Journal)
Luzio, G.A. 2006. Use of an evaporative light scattering detector coupled to malls for determination of polysaccharide molecular weight. Journal of Liquid Chromatography and Related Technologies. 29:185-201.
Rheological and Functional Properties of Block Deesterified Pectins - (Abstract Only)
Luzio, G.A. 2005. Rheological and functional properties of block deesterified pectins. Subtropical Technology Conference Proceedings. 56:9.
Mode of Action of Two Commercial Pectolytic Endo-Polygalacturonases - (Abstract Only)
Cameron, R.G., Luzio, G.A., Grohmann, K., Savary, B.J. 2005. Mode of action of two commercial pectolytic endo-polygalacturonases. National Meeting of Institute of Food Technologists/Food Expo. Paper No. 71B-3.
Determination of Galacturonic Acid Content of Pectin Using a Microtiter Plate Assay - (Proceedings)
Luzio, G.A. 2004. Determination of galacturonic acid content of pectin using a microtiter plate assay. Proceedings of Florida State Horticultural Society. 117:416-421.
Characterization of Esterified Blocks in Pectin Homogalacturonan Regions after De-Esterification with the Thermally Tolerant Pectin Methylesterase from Citrus Fruit Reprint Icon - (Proceedings)
Cameron, R.G., Luzio, G.A., Grohmann, K. 2004. Characterization of esterified blocks in pectin homogalacturonan regions after de-esterification with the thermally tolerant pectin methylesterase from citrus fruit. Proceedings of Florida State Horticultural Society. 117:410-415.
Investigation of Galacturonic Acid Colorimetric Assay of Pectin in Citrus Peel - (Abstract Only)
Luzio, G.A. 2004. Investigation of galacturonic acid colorimetric assay of pectin in citrus peel. Subtropical Technology Conference Proceedings. 55:42.
Molecular Size Analysis of Extracted Citrus Pectins by Multiangle Light Scattering - (Abstract Only)
Luzio, G.A. 2004. Molecular size analysis of extracted citrus pectins by multiangle light scattering. Annual Meeting of the Institute of Food Technologists. Book of Abstracts. p. 147. Paper No. 56-6.
Determination of Galacturonic Acid Content of Pectin Using a Microtiter Plate Assay - (Abstract Only) - (28-Feb-04)
Effect of Block Deesterification on the Pseudoplastic Properties of Pectin - (Proceedings)
Luzio, G.A. 2003. Effect of block deesterification on the pseudoplastic properties of pectin. Proceedings Of Florida State Horticultural Society. 116:425-429.
Effect of Block Deesterification on the Pseudoplastic Properties of Pectin - (Abstract Only) - (20-Sep-03)
Strategic Approach Toward Industrial Utilization of Citrus Peel - (Abstract Only)
Luzio, G.A. 2003. Strategic approach toward industrial utilization of citrus peel. Subtropical Technology Conference Proceedings. 54:41.
Malls/ri Setup for Sensitive Detection of Citrus Polysaccharides - (Abstract Only) - (30-Aug-03)
Last Modified: 12/13/2011