Corn Fiber Gum Research Articles

Corn fiber gum: A potential gum arabic replacer for beverage flavor emulsification

The US food industry would benefit from a domestically produced gum with a dependable supply and consistent quality that can be used for preparing oil-in-water (O-in-W) emulsions, such as citrus oil emulsions for beverages. Corn fiber gum (CFG) is an arabinoxylan (hemicellulose) extracted from the corn kernel pericarp and/or endosperm fiber fractions that can possibly fulfill this need. In this study two different types of CFG, CFG-1 and 2, were prepared from corn fiber collected from different wet or dry corn milling facilities by (a) sequential alkaline extraction and alkaline hydrogen peroxide bleaching and (b) an additional alkaline hydrogen peroxide treatment of the alkali treated residue, respectively. CFG-1 might be linked to the cell wall matrix through ester linkages and CFG-2 by non-ester linkages and/or other strong interactions. The stabilization of O-in-W emulsions by corn fiber and acacia gums was investigated by preparing emulsions with a high pressure homogenizer and monitoring the emulsion breakage by turbidity measurements. All CFG samples were effective emulsifiers but CFG-2 extracted separately from three different corn fiber sources was determined to be a better emulsifier than the corresponding CFG-1. CFGs isolated from wet milled pericarp and endosperm fiber and wet milled pericarp fiber have a higher protein content than CFGs isolated from dry milled pericarp fiber and were determined to be better emulsifiers for the O-in-W emulsion system. The emulsifying properties of all CFGs including an industrial grade commercial CFG were determined to be better than native and modified acacia gums.

Isolation and Characterization of Cellulose/Arabinoxylan Residual Mixtures from Corn Fiber Gum Processes

ABSTRACTWhite, fluffy cellulose/arabinoxylan mixtures (CAX) were generated from the solid residues remaining after corn fiber gum (CFG) production. Most CAX were produced using variations of a process in which a single alkaline hydrogen peroxide (AHP) step was used for delignification and for CFG (arabinoxylan) extraction. The optimal ratio of H2O2 to corn fiber to water was 0.1:1:20. Holding this ratio constant, time and temperature conditions were systematically varied, and yields of CAX and CFG determined. Parallel processes were conducted without H2O2 to determine its effect on CAX and CFG yield. CAX prepared under identical conditions but without H2O2 retained nearly twice the levels of CFG sugars, as revealed from L‐arabinose, D‐xylose, and D,L‐galactose levels. Even the CAX prepared under extreme AHP conditions (1 hr, 100°C), however, contained 32.9% of these CFG sugars. This CAX was obtained in a 25.1% yield, whereas those produced under less vigorous conditions were obtained in higher yields, because they retained more CFG. CAX prepared in the presence of H2O2 hydrated very effectively, as indicated by their high swollen volumes and water absorbance values. This suggests potential food applications for CAX as a bulking agent. In addition, the open structure of the CAX matrix would render these residues suitable for chemical derivatization and enzymatic saccharification.

Analysis and properties of arabinoxylans from discrete corn wet-milling fiber fractions.

Three fibrous corn wet-milling fractions, coarse fiber, fine fiber, and spent flake, were isolated. More highly valued uses are sought for these milling products, which are generally directed into the corn gluten feed product stream. Coarse fiber was further dissected into pericarp and aleurone layers. An alkaline hydrogen peroxide process was used to efficiently extract corn fiber gum (CFG) from each of the materials. CFG is a hemicellulose B arabinoxylan which also contains low levels of D,L-galactose and D-glucuronic acid. CFG yield information was obtained from each source, as well as structural information in terms of degrees of branching of the beta-D-xylopyranose backbone with alpha-L-arabinofuranosyl moieties. There were significant differences in degree of branching among the CFGs from the various fractions. A novel capillary electrophoresis procedure was developed to measure these differences. Solution viscosity differences among the CFGs were also observed.

Comparison of Coarse and Fine Corn Fiber for Corn Fiber Gum Yields and Sugar Profiles

Comparison of Coarse and Fine Corn Fiber for Corn Fiber Gum Yields and Sugar Profiles

Characterization of Hemicellulose B from Corn Fiber by High-Performance Size Exclusion Chromatography with On-Line Molar Mass and Viscometric Detection

Hemicellulose B (arabinoxylan, corn fiber gum, CFG) was prepared from corn fiber (CF) by alkaline extraction with 2 meq/g of CF using either NaOH, Ca(OH)2 or an equimolar mixture of the two. Prior to CFG extraction, oil was removed from CF by extraction with hexane and starch was removed from CF by treatment with α-amylase. The solutions of alkali-extracted CFG were then bleached with alkaline H2O2. The effect of extractant composition on the weight-average molar mass M w, weight-average intrinsic viscosity [η]w, and z-average root-mean-square radius of gyration R gz on CFG was determined. Depending on extractant composition and method of calculation, M w ranged from 2.7–6.96 × 105, [η]w from 1.87 to 2.00 dL/g and R gz from about 31 to 50 nm. Substituting Ca(OH)2 for NaOH reduced M w and R gz but had little or no effect on [η]w. Chromatographic analysis in conjunction with molar mass detection revealed that molar mass distributions were bimodal. M w for the high-molar-mass component ranged from about 8.4–16.1 × 105, whereas M w ranged from about 1.1–2.1 × 105 for the low-molar-mass component. The high-molar-mass component comprised about 15–43% by weight of CFG and was much more compact in shape than the low-molar-mass component.

Recovery of Fiber in the Corn Dry‐Grind Ethanol Process: A Feedstock for Valuable Coproducts

ABSTRACTA new process was developed to recover corn fiber from the mash before fermentation in dry‐grind ethanol production. In this process, corn is soaked in water (no chemicals) for a short period of time and then degermed using conventional degermination mills. In the remaining slurry, corn coarse fiber is floated by increasing the density of the slurry and then separated using density differences. The fiber recovered is called quick fiber to distinguish it from the conventional wet‐milled fiber. This study evaluated the percent of quick fiber recovery for a normal yellow dent and high oil corn hybrid. The quick fiber was analyzed for levels of corn fiber oil, levels of ferulate phytosterol esters (FPE) and other valuable phytosterol components in the oil and compared with conventional wet‐milled corn coarse and fine fiber samples. Fiber samples were also analyzed and compared for yields of potentially valuable corn fiber gum (CFG, hemicellulose B). Comparisons were made between the quick fiber samples obtained with and without chemicals in the soakwater. An average quick fiber yield of 6–7% was recovered from the two hybrids and represented 46–60% of the total fiber (fine and coarse) that could be recovered by wet‐milling these hybrids. Adding steep chemicals (SO2 and lactic acid) to the soakwater increased the quick fiber yields, percent of FPE recoveries, and total percent of phytosterol components to levels either comparable to (for the dent corn hybrid) or higher than (for the high oil corn hybrid) those recovered from the total conventional wet‐milled fiber samples. CFG yields in the quick fiber samples were comparable to those from the wet‐milled fiber samples. CFG yields in the quick fiber samples were not significantly affected by the addition of chemicals (SO2 and lactic acid) to the soakwater.

An Improved Process for Isolation of Corn Fiber Gum

ABSTRACTSequential alkaline extraction and alkaline hydrogen peroxide (AHP) bleaching have been used to prepare corn fiber gum in yields ranging from 21 to 40%, depending on the pH of the extraction medium. The pH was adjusted by using different ratios of NaOH and Ca(OH)2 The whitest product was obtained after AHP bleaching of the extract obtained using the lowest pH value. In order for the product gum to give its characteristic clear and low viscosity solutions, it was necessary to remove starch from the corn fiber substrate using α‐amylase. The water‐insoluble hemicellulose A fraction, a minor component, was removed by neutralizing AHP‐treated extracts before ethanol precipitation of the useful hemicellulose B (corn fiber gum) fraction. At ambient temperature, AHP bleaching was near optimal after ≈2 hr under the processing conditions used. High ratios of arabinose (39%) to xylose (50%) were present in the corn fiber gum extracted under various alkaline conditions, and the H2O2 processing step did not significantly alter these ratios. The same low levels of galactose (7%) and glucuronic acid (4%) were present regardless of the extraction conditions. Molecular mass of the corn fiber gum preparations ranged from 2.78 × 105 for the material extracted with Ca(OH)2 to 3.94 × 105 for the material extracted with NaOH. Molecular mass was unaffected by the H2O2 present in the second processing step. As expected for a carbohydrate polymer with a rather low uronic acid content, solution viscosities were unaffected by the presence of salt.

Notes - Acid Resistant Portion of Corn Fiber Gum

Notes - Acid Resistant Portion of Corn Fiber Gum

Hydrolysis Components from Methylated Corn Fiber Gum1,2

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrolysis Components from Methylated Corn Fiber Gum1,2Roy L. Whistler and J. N. BeMillerCite this: J. Am. Chem. Soc. 1956, 78, 6, 1163–1165Publication Date (Print):March 1, 1956Publication History Published online1 May 2002Published inissue 1 March 1956https://doi.org/10.1021/ja01587a019RIGHTS & PERMISSIONSArticle Views126Altmetric-Citations38LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (380 KB) Get e-Alerts Get e-Alerts