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- Author:
- Baba, S.; Osakabe, N.; Natsume, M.; Muto, Y.; Takizawa, T.; Terao, J.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 6050-6056
- ISSN:
- 0021-8561
- Subject:
- cocoa products; powders; oral administration; epicatechin; bioavailability; intestinal absorption; excretion; urine; metabolites; rats
- Abstract:
- ... (-)-Epicatechin is a major polyphenol component of cocoa powder. The absorption and urinary excretion of (-)-epicatechin following administration of different levels of either cocoa powder (150, 750, and 1500 mg/kg) or (-)-epicatechin (1, 5, and 10 mg/kg) were evaluated in rats. Both the sum of plasma (-)-epicatechin metabolites at 1 h postadministration and peak plasma concentrations increased in ...
- DOI:
- 10.1021/jf010965h
- PubMed:
- 11743807
-
http://dx.doi.org/10.1021/jf010965h
- Author:
- Gu, Y.S.; Matsumura, Y.; Mori, T.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5999-6005
- ISSN:
- 0021-8561
- Subject:
- molecular conformation; enzyme activity; glutaminase; bacteria; Chryseobacterium proteolyticum; protein tertiary structure; lactalbumin
- Abstract:
- ... The action of a novel protein-glutaminase from microorganisms on alpha-lactalbumin was investigated. When alpha-lactalbumin in the native state was incubated with protein-glutaminase, the deamidation proceeded gradually, i.e., the deamidation degree increased to 20% and 55% after 4 and 24 h, respectively. The transformation of alpha-lactalbumin from the native state to the molten globule state cau ...
- DOI:
- 10.1021/jf010287z
- PubMed:
- 11743799
-
http://dx.doi.org/10.1021/jf010287z
- Author:
- Hwang, J.Y.; Hwang, I.K.; Park, J.B.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 6045-6049
- ISSN:
- 0021-8561
- Subject:
- chemical composition; Castanea crenata; sugars; proanthocyanidins; peeling; varieties; tannins; firmness; color; chestnuts; shelling; hulls
- Abstract:
- ... Analyses were carried out for condensed tannin content, soluble sugar content, color, firmness, and peeling ratio of the pellicle of 14 varieties of Korean chestnut. The correlation between these physicochemical components and the peeling ratio was measured. The total soluble sugar content ranged from 4.20 to 11.83%. Condensed tannin contents in the inner and outer chestnut shells were 7.83-71.42% ...
- DOI:
- 10.1021/jf010744b
- PubMed:
- 11743806
-
http://dx.doi.org/10.1021/jf010744b
- Author:
- Rumbo, M.; Chirdo, F.G.; Fossati, C.A.; Anon, M.C.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5719-5726
- ISSN:
- 0021-8561
- Subject:
- gliadin; allergens; monoclonal antibodies; heat treatment; antiserum; dough; enzyme-linked immunosorbent assay
- Abstract:
- ... Antigen-labeled capture enzyme-linked immunosorbent assay with four different anti-gliadin monoclonal antibodies and an anti-gliadin serum and two different sample systems (purified gliadin fractions heat-treated in soluble phase and a model of dough simulating a baking process) were employed to study the effects of heat treatment on gliadin quantification. The analysis of purified gliadins showed ...
- DOI:
- 10.1021/jf010180b
- PubMed:
- 11743753
-
http://dx.doi.org/10.1021/jf010180b
- Author:
- Cabrini, L.; Barzanti, V.; Cipollone, M.; Fiorentini, D.; Grossi, G.; Tolomelli, B.; Zambonin, L.; Landi, L.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 6026-6032
- ISSN:
- 0021-8561
- Subject:
- sunflower oil; soybean oil; free radicals; olive oil; long chain fatty acids; gamma-tocopherol; alpha-tocopherol; ubiquinones; beta-carotene; corn oil; oxidation; peanut oil; phenolic compounds
- Abstract:
- ... The presence of the oxidized and reduced forms of ubiquinones Q9 and Q10 was determined in commercial extra virgin olive and seed oils, where the amounts of alpha- and gamma-tocopherols and beta-carotene were also quantitated. Very high concentrations of ubiquinones were found in soybean and corn oils. Furthermore, the total antioxidant capability of each oil was evaluated by measuring total radic ...
- DOI:
- 10.1021/jf010837t
- PubMed:
- 11743803
-
http://dx.doi.org/10.1021/jf010837t
- Author:
- Provenzano, M.R.; Oliveira, S.C. de.; Silva, M.R.S.; Senesi, N.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5874-5879
- ISSN:
- 0021-8561
- Subject:
- fluorescence; infrared spectroscopy; carbon nitrogen ratio; emissions
- Abstract:
- ... Methods of assessment of compost maturity are needed so the application of composted materials to lands will provide optimal benefits. The aim of the present paper is to assess the maturity reached by composts from domestic solid wastes (DSW) prepared under periodic and permanent aeration systems and sampled at different composting time, by means of excitation-emission matrix (EEM) fluorescence sp ...
- DOI:
- 10.1021/jf0106796
- PubMed:
- 11743777
-
http://dx.doi.org/10.1021/jf0106796
- Author:
- Demyttenaere, J.C.R.; Adams, A.; Vanoverschelde, J.; Kimpe, N. de.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5895-5901
- ISSN:
- 0021-8561
- Subject:
- Aspergillus niger; linalool; metabolism; cultured cells; metabolites; odors
- Abstract:
- ... The biotransformation of (S)-(+)-linalool by different Aspergillus niger strains was studied, using submerged shaken liquid cultures. One strain, A. niger DSM 821, was able to convert the substrate to cis- and trans-furanoid linalool oxide (yield 30% and 5%, respectively) and cis- and trans-pyranoid linalool oxide (yield 14% and 1.5%, respectively). The main metabolites, cis-(2S,5R)-furanoid and c ...
- DOI:
- 10.1021/jf010581r
- PubMed:
- 11743781
-
http://dx.doi.org/10.1021/jf010581r
- Author:
- Fournand, D.; Lapierre, C.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5727-5731
- ISSN:
- 0021-8561
- Subject:
- phenolic compounds; alcohols; electrophoresis; oxidation; enzyme activity; peroxidase; pH; temperature
- Abstract:
- ... Capillary zone electrophoresis (CZE) was developed for the quantitative determination of dimers obtained by horseradish peroxidase-catalyzed oxidation of coniferyl alcohol. The influence of pH, electrolyte concentration, applied voltage, and temperature on CZE performance was investigated, resulting in an efficient and rapid separation. Coniferyl alcohol-derived dimers were directly analyzed from ...
- DOI:
- 10.1021/jf010833o
- PubMed:
- 11743754
-
http://dx.doi.org/10.1021/jf010833o
- Author:
- Boulanger, R.; Crouzet, J.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5911-5915
- ISSN:
- 0021-8561
- Subject:
- tropical and subtropical fruits; fruit pulp; heat treatment; volatile compounds; terpenoids; aldehydes; esters; food processing; Platonia insignis
- Abstract:
- ... The formation of volatile compounds from precursors or through chemical rearrangement during heat treatment of bacuri pulp at fruit natural pH were studied using simultaneous distillation/extraction (SDE) technique. An increase of the quantities of oxygenated and hydrocarbon terpenes and, to a lesser degree, aldehydes, was observed after SDE at pH 3, relative to the other extraction methods used, ...
- DOI:
- 10.1021/jf010894m
- PubMed:
- 11743784
-
http://dx.doi.org/10.1021/jf010894m
- Author:
- Buyukpamukcu, E.; Goodall, D.M.; Hansen, C.E.; Keely, B.J.; Kochhar, S.; Wille, H.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5822-5827
- ISSN:
- 0021-8561
- Subject:
- fermentation; vicilin; oligopeptides; chromatography; cocoa beans; amino acids; mass spectrometry; protein composition
- Abstract:
- ... Analysis by SDS-PAGE and GPC-MS of fermented cocoa extracts shows changes in the amount and composition of the major proteins, accompanied by formation of complex distributions of peptides. MS/MS studies and application of SEQUEST sequencing software have allowed identification of two related peptides, a hexapeptide and a nonapeptide, formed from vicilin, one of the cocoa storage proteins. Time co ...
- DOI:
- 10.1021/jf0104127
- PubMed:
- 11743769
-
http://dx.doi.org/10.1021/jf0104127
- Author:
- Jhoo, J.W.; Sang, S.; He, K.; Cheng, X.; Zhu, N.; Stark, R.E.; Zheng, Q.Y.; Rosen, R.T.; Ho, C.T.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5969-5974
- ISSN:
- 0021-8561
- Subject:
- Berberidaceae; medicinal plants; roots; chemical structure; chemical constituents of plants
- Abstract:
- ... Seven triterpene saponins were isolated from n-butanol fractions of blue cohosh (Caulophyllum thalictroides) roots and rhizomes. Their structures were established by spectral (1H NMR, 13C NMR, 2D-NMR, and APCI-MS) techniques and chemical reactions as hederagenin 3-O-alpha-L-arabinopyranoside (1); caulophyllogenin 3-O-alpha-L-arabinopyranoside (2); hederagenin 3-O-beta-D-glucopyranosyl-(1 leads to ...
- DOI:
- 10.1021/jf010814e
- PubMed:
- 11743794
-
http://dx.doi.org/10.1021/jf010814e
- Author:
- Pino, J.A.; Marbot, R.; Vazquez, C.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5883-5887
- ISSN:
- 0021-8561
- Subject:
- tropical and subtropical fruits; volatile compounds; esters; terpenoids; odors
- Abstract:
- ... Volatile compounds were isolated from strawberry guava fruit by simultaneous steam distillation-solvent extraction according to Likens-Nickerson. Compounds were identified by capillary GC-MS and sensorially characterized by sniffing GC. Two hundred and four compounds were identified in the aroma concentrate, of which ethanol, alpha-pinene, (Z)-3-hexenol, (E)-beta-caryophyllene, and hexadecanoic ac ...
- DOI:
- 10.1021/jf010414r
- PubMed:
- 11743779
-
http://dx.doi.org/10.1021/jf010414r
- Author:
- Gallori, S.; Flamini, G.; Bilia, A.R.; Morelli, I.; Landini, A.; Vincieri, F.F.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5907-5910
- ISSN:
- 0021-8561
- Subject:
- Asteraceae; herbal medicines; essential oils; plant extracts; chemical composition; leaves; monoterpenoids
- Abstract:
- ... The compositions of the essential oil and the aromatic water of costmary (Balsamita suaveolens Pers.) cultivated in Tuscany were investigated. They represent the main ingredients of some traditional preparations sold commercially. The essential oil as such and the n-hexane extract of the aromatic water were analyzed by GC and GC-MS. Both samples were found to be rich in monoterpenes. Eighty-five c ...
- DOI:
- 10.1021/jf0107656
- PubMed:
- 11743783
-
http://dx.doi.org/10.1021/jf0107656
- Author:
- Song, Z.; Wang, L.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5697-5701
- ISSN:
- 0021-8561
- Subject:
- chemiluminescence; urine; humans; organic compounds; herbal medicines
- Abstract:
- ... A novel continuous-flow sensor based on chemiluminescence (CL) detection was developed for the determination of rutin in pharmaceutical preparations and human urine by controlled-reagent-release technology. The analytical reagents involved in the CL reaction, including luminol and hexacyanoferrate(III), were both immobilized on an anion-exchange column in a flow-injection system. The CL signal pro ...
- DOI:
- 10.1021/jf010354p
- PubMed:
- 11743749
-
http://dx.doi.org/10.1021/jf010354p
- Author:
- Matusheski, N.V.; Jeffery, E.H.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5743-5749
- ISSN:
- 0021-8561
- Subject:
- broccoli; organic sulfur compounds; nitriles; oral administration; enzyme activity; oxidoreductases; glutathione transferase; liver; colon; intestinal mucosa; pancreas; rats
- Abstract:
- ... Epidemiological and laboratory studies suggest that dietary broccoli may prevent or delay a variety of cancers. Broccoli and other crucifers contain a relatively unique family of secondary metabolites called glucosinolates. Glucoraphanin, the major glucosinolate in broccoli, is hydrolyzed by an endogenous plant myrosinase to form either the potent anticarcinogen sulforaphane (SF) or sulforaphane n ...
- DOI:
- 10.1021/jf010809a
- PubMed:
- 11743757
-
http://dx.doi.org/10.1021/jf010809a
- Author:
- Goubet, I.; Dahout, C.; Semon, E.; Guichard, E.; Le Quere, J.L.; Voilley, A.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5916-5922
- ISSN:
- 0021-8561
- Subject:
- volatile compounds; esters; alcohols; odors; dextrins; encapsulation
- Abstract:
- ... Retention of six aroma compounds has been studied after dehydration of ternary mixtures of aroma water and beta-cyclodextrin. A maximal retention of a mole of aroma per mole of beta-cyclodextrin has been observed for five of the aroma compounds, whereas retention of benzyl alcohol can be twice as high. Retention of a mixture of aroma compounds has also been studied. It has been noted that when vol ...
- DOI:
- 10.1021/jf0101049
- PubMed:
- 11743785
-
http://dx.doi.org/10.1021/jf0101049
- Author:
- Diem, S.; Gutsche, B.; Herderich, M.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5993-5998
- ISSN:
- 0021-8561
- Subject:
- alkaloids; heterocyclic nitrogen compounds; high performance liquid chromatography; mass spectrometry; degradation; nitrites
- Abstract:
- ... Motivated by the identification of numerous novel tetrahydro-beta-carboline-carboxylic acids in food samples, we studied the reactions of tetrahydro-beta-carbolines in the presence of nitrosating agents. The anticipated formation of nitroso derivatives from unsubstituted tetrahydro-beta-carbolines, and from tetrahydro-beta-carboline-3-carboxylic acids was indicated by HPLC-MS/MS analysis and valid ...
- DOI:
- 10.1021/jf010363y
- PubMed:
- 11743798
-
http://dx.doi.org/10.1021/jf010363y
- Author:
- Dreassi, E.; Corbini, G.; La Rosa, C.; Politi, N.; Corti, P.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 5702-5705
- ISSN:
- 0021-8561
- Subject:
- chickens; levamisole; pork; liver; drug residues; muscles; sheep; chicken meat; detectors; swine; kidneys; liquid chromatography; body fat
- Abstract:
- ... An efficient and sensitive liquid chromatographic method is described for the determination of the anthelminthic drug levamisole, in muscle, liver, kidney and fat of sheep, pigs and poultry, using thiabendazole as internal standard. Samples were extracted by homogenizing with chloroform, and were applied to Supelco Si solid-phase extraction columns and eluted with methanol. Chromatographic analysi ...
- DOI:
- 10.1021/jf0102362
- PubMed:
- 11743750
-
http://dx.doi.org/10.1021/jf0102362
- Author:
- Haorah, J.; Zhou, L.; Wang, X.; Xu, G.; Mirvish, S.S.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 6068-6078
- ISSN:
- 0021-8561
- Subject:
- ketchup; pork; salted fish; hot dogs; dried fish; chicken meat; ground beef; smoke; chemical analysis; soy sauce; nitroso compounds; tobacco
- Abstract:
- ... Total N-nitroso compounds (NOC) and NOC precursors (NOCP) were determined in extracts of food and tobacco products. Following Walters' method, NOC were decomposed to NO with refluxing HBr/HCl/HOAc/EtOAc and NO was measured by chemiluminescence. NOC were determined after sulfamic acid treatment to destroy nitrite, and NOCP were determined after treatment with 110 mM nitrite and then sulfamic acid. ...
- DOI:
- 10.1021/jf010602h
- PubMed:
- 11743810
-
http://dx.doi.org/10.1021/jf010602h
- Author:
- Jin, C.; Shen, S.; Zhao, B.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.12 pp. 6033-6038
- ISSN:
- 0021-8561
- Subject:
- epicatechin; dopamine; viability; DNA fragmentation; neoplasms; epigallocatechin; cell lines; catechin; Parkinson disease; apoptosis; rats
- Abstract:
- ... Five catechins [(-)-epigallocatechins gallate (EGCG), (-)-epicatechin gallate (ECG), (-)-epigallocatechin (EGC), (-)-epicatechin (EC), and (+)-catechin (C)] were compared with regard to their effects on 6-hydroxydopamine (OHDA)-induced apoptosis in PC12 cells-the vitro model of Parkinson's disease. Measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, 6-OHDA inhibit ...
- DOI:
- 10.1021/jf010903r
- PubMed:
- 11743804
-
http://dx.doi.org/10.1021/jf010903r