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Roopchand D.E.,Rutgers University | Krueger C.G.,Complete Phytochemical Solutions LLC | Krueger C.G.,University of Wisconsin - Madison | Moskal K.,Nutrasorb, Llc | And 3 more authors.
Food Chemistry | Year: 2013

Cranberry pomace is a byproduct of cranberry processing and is comprised of seeds, skins and stems of the cranberry fruit. While cranberry pomace contains beneficial polyphenols, including proanthocyanidins and anthocyanins, it is not a palatable source of these compounds and is typically discarded. In this study, we have developed and optimized a method to extract polyphenols from cranberry pomace using aqueous ethanol, a food grade solvent. Biochemical characterization of the pomace extract showed the presence of a broad range of polyphenols also present in cranberry juice concentrate. By co-drying cranberry pomace extract with a protein-rich food matrix, such as soy protein isolate (SPI), we have developed a method to produce a cranberry polyphenol-SPI complex (CBP-SPI) containing 10% cranberry polyphenols. Unlike dried cranberry pomace extract alone, proanthocyanidins, anthocyanins and total polyphenols were found to be highly stable at 37 °C in the CBP-SPI powder. The extraction and stabilization of cranberry pomace polyphenols using SPI provides an innovative approach for utilizing pomace in the development of novel food ingredients. © 2013 Elsevier Ltd. All rights reserved.

Roopchand D.E.,Rutgers University | Roopchand D.E.,Nutrasorb, Llc | Kuhn P.,Rutgers University | Krueger C.G.,Complete Phytochemical Solutions LLC | And 4 more authors.
Journal of Agricultural and Food Chemistry | Year: 2013

Polyphenols extracted from Concord grape pomace were stabilized by complexation to soy protein isolate (SPI) to produce grape polyphenol-SPI complex (GP-SPI) containing 5% or 10% grape polyphenols. LC-MS and MALDI-TOF analysis showed that a broad range of phytochemicals were present in the grape pomace extract. Anthocyanins and total polyphenols in the GP-SPI complex were stable after a 16-week incubation at 37 C but were reduced by up 60% in dried grape pomace extract. Compared to vehicle (236 ± 34 mg/dL), a single dose of 300 mg/kg GP-SPI (184 ± 32 mg/dL) or 500 mg/kg GP-SPI (177 ± 28 mg/dL) having 5% grape polyphenols significantly lowered blood glucose in obese and hyperglycemic C57BL/6 mice 6 h after administration. GP-SPI allows the capture of grape pomace polyphenols in a protein-rich food matrix and may be useful as a functional food ingredient for the management of blood glucose levels. © 2013 American Chemical Society.

Feliciano R.P.,University of Wisconsin - Madison | Shea M.P.,University of Wisconsin - Madison | Shanmuganayagam D.,University of Wisconsin - Madison | Krueger C.G.,University of Wisconsin - Madison | And 5 more authors.
Journal of Agricultural and Food Chemistry | Year: 2012

The 4-(dimethylamino)cinnamaldehyde (DMAC) assay is currently used to quantify proanthocyanidin (PAC) content in cranberry products. However, this method suffers from issues of accuracy and precision in the analysis and comparison of PAC levels across a broad range of cranberry products. Current use of procyanidin A2 as a standard leads to an underestimation of PACs content in certain cranberry products, especially those containing higher molecular weight PACs. To begin to address the issue of accuracy, a method for the production of a cranberry PAC standard, derived from an extraction of cranberry (c-PAC) press cake, was developed and evaluated. Use of the c-PAC standard to quantify PAC content in cranberry samples resulted in values that were 2.2 times higher than those determined by procyanidin A2. Increased accuracy is critical for estimating PAC content in relationship to research on authenticity, efficacy, and bioactivity, especially in designing clinical trials for determination of putative health benefits. © 2012 American Chemical Society.

Krueger C.G.,Complete Phytochemical Solutions LLC | Krueger C.G.,University of Wisconsin - Madison | Reed J.D.,Complete Phytochemical Solutions LLC | Reed J.D.,University of Wisconsin - Madison | And 2 more authors.
Analytical and Bioanalytical Chemistry | Year: 2013

The A-type proanthocyanidins in cranberry fruit (Vaccinium macrocarpon Ait.) are bioactive components associated with prevention of urinary tract infections (UTI). Cranberry juice, fruit (fresh and dried), functional foods, and cranberry dietary supplements are promoted for prevention of UTI and for maintenance of urinary tract health (UTH), on the basis of their content of cranberry proanthocyanidins (c-PAC) with A-type interflavan bonds. With increasing consumer use of cranberries for maintenance of UTH and an expanding number of commercial cranberry products of different types, the availability of unified methods for measuring levels of c-PAC is important. This review discusses quantitative and qualitative analysis of c-PAC with A-type interflavan bonds in relation to their biological activity for UTI prevention. The integrity (including authenticity, standardization, efficacy, and safety) of cranberry fruit, juices, and dietary supplements may now be measured by using recent advances in mass spectrometry, liquid chromatography, production of c-PAC standards, and improved simple quantitative techniques. © Springer-Verlag Berlin Heidelberg 2013.

Feliciano R.P.,University of Wisconsin - Madison | Heintz J.A.,Biological and Biomaterials Preparation | Krueger C.G.,University of Wisconsin - Madison | Krueger C.G.,Complete Phytochemical Solutions LLC | And 3 more authors.
Food Chemistry | Year: 2015

A novel methodology was developed to elucidate proanthocyanidins (PAC) interaction with extra-intestinal pathogenic Escherichia coli (ExPEC). PAC inhibit ExPEC invasion of epithelial cells and, therefore, may prevent transient gut colonization, conferring protection against subsequent extra-intestinal infections, such as urinary tract infections. Until now PAC have not been chemically labeled with fluorophores. In this work, cranberry PAC were labeled with 5-([4,6-dichlorotriazin-2-yl]amino) fluorescein (DTAF), detected by high-performance liquid chromatography with diode-array detection and characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). We report single and double fluorescent-labeled PAC with one or two chlorine atoms displaced from DTAF in alkaline pH via nucleophilic substitution. Fluorescent labeling was confirmed by fragmentation experiments using MALDI-TOF/TOF MS. Fluorescent labeled PAC were able to promote ExPEC agglutination when observed with fluorescence microscopy. DTAF tagged PAC may be used to trace the fate of PAC after they agglutinate ExPEC and follow PAC-ExPEC complexes in cell culture assays. © 2014 Elsevier Ltd. All rights reserved.

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