Jump to Main Content
PubAg
Main content area
Search
« Previous |
1 - 20 of 82
|
Next »
Search Results
- Author:
- Block, E.; Birringer, M.; Jiang, W.; Nakahodo, T.; Thompson, H.J.; Toscano, P.J.; Uzar, H.; Zhang, X.; Zhu, Z.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 458-470
- ISSN:
- 0021-8561
- Subject:
- organic compounds; selenium; synthesis; antineoplastic agents; Allium; oxidation; spectral analysis; chemical constituents of plants; oxides; chemical structure
- Abstract:
- ... Syntheses are reported for gamma-glutamyl Se-methylselenocysteine (8a), selenolanthionine (16), Se-1-propenylselenocysteine (6d), Se-2-methyl-2-propenyl-L-selenocysteine (6e), and Se-2-propynyl-L-selenocysteine (6f). Oxidation of 8a and Se-methylselenocysteine (6a) gives methaneseleninic acid (24), characterized by X-ray crystallography, and dimethyl diselenide (25). Oxidation of Se-2-propenyl-L-s ...
- DOI:
- 10.1021/jf001097b
- PubMed:
- 11305255
-
http://dx.doi.org/10.1021/jf001097b
- Author:
- Mau, J.L.; Chen, C.P.; Hsieh, P.C.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 183-188
- ISSN:
- 0021-8561
- Subject:
- Cinnamomum aromaticum; plant extracts; mixtures; antibacterial properties; antifungal properties; food preservatives; physicochemical properties
- Abstract:
- ... Extracts were prepared from Chinese chive (Allium tuberosum), cinnamon (Cinnamomum cassia), and corni fructus (Cornus officinalis) and used to evaluate their antimicrobial activity on common foodborne microorganisms, alone and in combination. The mixed extract, consisting of three extracts in equal volumes, showed an entire antimicrobial spectrum and had excellent stability to heat, pH, and storag ...
- DOI:
- 10.1021/jf000263c
- PubMed:
- 11170575
-
http://dx.doi.org/10.1021/jf000263c
- Author:
- Miyazawa, M.; Sakano, K.; Nakamura, S.; Kosaka, H.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 336-341
- ISSN:
- 0021-8561
- Subject:
- traditional medicine; isoflavones; Pueraria montana var. lobata; plant extracts; mutagenicity; medicinal properties
- Abstract:
- ... A methanol extract from Pueraria lobata showed a suppressive effect on umu gene expression of the SOS response in Salmonella typhimurium TA1535/pSK1002 against the mutagen 2-(2-furyl)-3-(5-nitro-2-furyl)acrylamide (furylfuramide). The methanol extract from P. lobata was re-extracted with hexane, dichloromethane, ethyl acetate, butanol, and water, respectively. A suppressive compound in the dichlor ...
- DOI:
- 10.1021/jf000255w
- PubMed:
- 11170596
-
http://dx.doi.org/10.1021/jf000255w
- Author:
- Niwa, T.; Doi, U.; Kato, Y.; Osawa, T.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 177-182
- ISSN:
- 0021-8561
- Subject:
- antioxidants; phenolic compounds; structure-activity relationships
- Abstract:
- ... With the immersion of corn into dilute sulfur oxide during starch-manufacturing processes, corn steep liquor (CSL) remains as leftover material. CSL is often used for fermentation, but its components are not fully understood. To determine the properties of CSL, 12 p-coumaric acid-related compounds were isolated from an ethyl acetate extract of CSL with the guidance of antioxidative activity on the ...
- DOI:
- 10.1021/jf0007885
- PubMed:
- 11170574
-
http://dx.doi.org/10.1021/jf0007885
- Author:
- Werf, M.J. van der.; Venema, K.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 378-383
- ISSN:
- 0021-8561
- Subject:
- Bifidobacterium; probiotics; intestinal microorganisms; colon; stomach; small intestine; models; genetic transformation; genetic vectors; genetic engineering
- Abstract:
- ... Bifidobacteria are among the most common bacteria in the human intestine and are thought to have a positive effect on human health. Therefore, there is an increasing interest in using these microorganisms as probiotics, either in fermented dairy products or formulated as tablets. However, convincing scientific data supporting their health claims are scarce. The study of the role of bifidobacteria ...
- DOI:
- 10.1021/jf000952o
- PubMed:
- 11170602
-
http://dx.doi.org/10.1021/jf000952o
- Author:
- Oberholster, R.; Cowan, A.K.; Molnar, P.; Toth, G.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 303-307
- ISSN:
- 0021-8561
- Subject:
- oranges; Citrus sinensis; color; carotenoids; biochemistry; food quality
- Abstract:
- ... The biochemical basis of color as an aesthetic quality in mature fruit of navel and Valencia orange (Citrus sinensis) was determined. Saponification of the two major color-imparting components resolved by thin-layer chromatography, followed by reversed-phase high-performance liquid chromatography, revealed that these comprised acyl esters of (9Z)-violaxanthin and beta-citraurin. Identification of ...
- DOI:
- 10.1021/jf0007840
- PubMed:
- 11170592
-
http://dx.doi.org/10.1021/jf0007840
- Author:
- Saavedra, L.; Ruperez, F.J.; Barbas, C.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 9-13
- ISSN:
- 0021-8561
- Subject:
- isocitric acid; ultraviolet radiation; tartaric acid; orange juice; oranges; adulterated products; malic acid; citric acid; electrophoresis; detection
- Abstract:
- ... Fruit juices have very distinct organic acid profiles that can be used as fingerprints for establishing possible adulteration. Recently, our group developed and validated a capillary electrophoresis method using UV detection for determining citric, isocitric, tartaric, and malic acids in natural and commercial orange juices. Sample treatment consisted of only dilution and centrifugation or filtrat ...
- DOI:
- 10.1021/jf0004762
- PubMed:
- 11170552
-
http://dx.doi.org/10.1021/jf0004762
- Author:
- Rival, S.G.; Boeriu, C.G.; Wichers, H.J.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 295-302
- ISSN:
- 0021-8561
- Subject:
- linoleic acid; peroxides; free radicals; lipid peroxidation; hemoglobin; catalysts; organic nitrogen compounds; free radical scavengers; casein; oxidation; chelation
- Abstract:
- ... The antioxidant activity of caseins and casein-derived peptides was evaluated by using three free radical producing reactions-the lipoxygenase- and AAPH-catalyzed oxidation of linoleic acid and the hemoglobin-catalyzed oxidation of linoleic acid hydroperoxide. Caseins and casein-derived peptides were able to inhibit enzymatic and nonenzymatic lipid peroxidation, suggesting they were preferred targ ...
- DOI:
- 10.1021/jf0003911
- PubMed:
- 11170591
-
http://dx.doi.org/10.1021/jf0003911
- Author:
- Rival, S.G.; Fornaroli, S.; Boeriu, C.G.; Wichers, H.J.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 287-294
- ISSN:
- 0021-8561
- Subject:
- linoleate 13S-lipoxygenase; soybeans; beta-casein; enzyme inhibitors; enzyme activity
- Abstract:
- ... Whole casein from bovine origin, the different casein subtypes alpha, beta, and kappa, and the related dephosphorylated proteins were assayed as modulators of soybean lipoxygenase 1 activity and were found to inhibit it. To define the lipoxygenase inhibitory domain, whole casein and beta-casein were digested by proteases (trypsin, clostripain, and subtilisin). The beta-casein tryptic digest and th ...
- DOI:
- 10.1021/jf000392t
- PubMed:
- 11170590
-
http://dx.doi.org/10.1021/jf000392t
- Author:
- Ollilainen, V.; Finglas, P.M.; Berg, H. van den.; Froidmont-Gortz, I. de.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 315-321
- ISSN:
- 0021-8561
- Subject:
- thiamin; riboflavin; pyridoxine; vitamin B12; reference standards; food analysis; food composition; certification
- Abstract:
- ... In 1989, the Community Bureau of Reference started a research program to improve the quality of vitamin analysis in food. To achieve this task, vitamin methodology was evaluated and tested by interlaboratory studies and the preparation of certified reference materials, which will be used for quality control of vitamin measurements. The main improvements in methodology were achieved by testing and ...
- DOI:
- 10.1021/jf9912497
- PubMed:
- 11305253
-
http://dx.doi.org/10.1021/jf9912497
- Author:
- Frank, O.; Ottinger, H.; Hofmann, T.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 231-238
- ISSN:
- 0021-8561
- Subject:
- xylose; Maillard reaction products; bioassays; amino acids; flavor compounds; spectral analysis; pentoses; heat treatment; screening
- Abstract:
- ... Thermal treatment of aqueous solutions of xylose and primary amino acids led to rapid development of a bitter taste of the reaction mixture. To characterize the key compound causing this bitter taste, a novel bioassay, which is based on the determination of the taste threshold of reaction products in serial dilutions of HPLC fractions, was developed to select the most intense taste compounds in th ...
- DOI:
- 10.1021/jf0010073
- PubMed:
- 11170582
-
http://dx.doi.org/10.1021/jf0010073
- Author:
- Piccaglia, R.; Marotti, M.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 239-244
- ISSN:
- 0021-8561
- Subject:
- Foeniculum vulgare; plant morphology; agronomic traits; germplasm; essential oils; geographical distribution; latitude; chemical constituents of plants; Italy
- Abstract:
- ... Wild samples of Foeniculum vulgare Mill. (fennel) were collected from thirteen Italian localities at different latitudes and grown in field trials to evaluate their morphological and agronomic characteristics and essential oil compositions. All the parameters were recorded at full bloom stage, and the essential oils (obtained by steam distillation) were characterized by gas chromatography (GC) and ...
- DOI:
- 10.1021/jf000636+
- PubMed:
- 11170583
-
http://dx.doi.org/10.1021/jf000636+
- Author:
- Du, W.X.; Huang, T.; Kim, J.; Marshall, M.R.; Wei, C.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 527-534
- ISSN:
- 0021-8561
- Subject:
- marine fish; sensory evaluation; food storage; food quality; food microbiology; extracts; temperature; biogenic amines
- Abstract:
- ... The quality for mahi-mahi stored at 1.7, 7.2, and 12.8 degrees C for 0, 1, 3, and 5 days was determined using biogenic amine analysis, microbial counts, and sensory evaluation (by a sensory test panel and an AromaScan). Biogenic amines in methanol extracts from mahi-mahi samples were analyzed using capillary electrophoresis (CE) with ultraviolet detection at 210 nm and a gas chromatography (GC) me ...
- DOI:
- 10.1021/jf0011135
- PubMed:
- 11305257
-
http://dx.doi.org/10.1021/jf0011135
- Author:
- Rogerson, F.S.S.; Castro, H.; Fortunato, N.; Azevedo, Z.; Macedo, A.; Freitas, V.A.P. de.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 263-269
- ISSN:
- 0021-8561
- Subject:
- diacetyl; quantitative analysis; isoprenoids; port wines; flavor compounds; odors; Portugal
- Abstract:
- ... 2,6,6-Trimethylcyclohex-2-ene-1,4-dione (TMCHD), a norisoprenoid with a sweet honey aroma descriptor, is reported for the first time as a minor constituent of single-varietal table and fortified wines from the demarcated Douro region. Olfactory gas chromatography (GC-O) of a volatile wine extract, previously isolated by preparative gas chromatography, indicated the presence of a zone containing an ...
- DOI:
- 10.1021/jf000948c
- PubMed:
- 11170587
-
http://dx.doi.org/10.1021/jf000948c
- Author:
- Mitra, S.; Dungan, S.R.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 384-394
- ISSN:
- 0021-8561
- Subject:
- Quillaja; saponins; bile salts; nonionic surfactants; cholesterol; solubilization; micelles
- Abstract:
- ... Quillaja saponin in aqueous solution enhanced cholesterol solubility by as much as a factor of 10(3) at room temperature. Increased temperature and [NaCl] increased cholesterol solubility, whereas solubility was greatest at an aqueous pH of 4.6 at 298 K. Although various saponin sources were observed to differ in their abilities to solubilize cholesterol, trends in their solubilization properties ...
- DOI:
- 10.1021/jf000568r
- PubMed:
- 11170603
-
http://dx.doi.org/10.1021/jf000568r
- Author:
- Anthon, G.E.; Barrett, D.M.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 32-37
- ISSN:
- 0021-8561
- Subject:
- peroxides; colorimetry; heme; linoleate 13S-lipoxygenase; hemoglobin; rapid methods; oxidants; oxidation; vegetables; enzyme activity; aminobenzoic acids
- Abstract:
- ... A colorimetic assay for lipoxygenase activity has been developed. The assay is based on the detection of the lipoxygenase reaction product, linoleic acid hydroperoxide, by the oxidative coupling of 3-methyl-2-benzothiazolinone (MBTH) with 3-(dimethylamino)benzoic acid (DMAB) in a hemoglobin-catalyzed reaction. This test reaction is rapid and sensitive, and it offers advantages over other methods f ...
- DOI:
- 10.1021/jf000871s
- PubMed:
- 11170556
-
http://dx.doi.org/10.1021/jf000871s
- Author:
- Malien-Aubert, C.; Dangles, O.; Amiot, M.J.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 170-176
- ISSN:
- 0021-8561
- Subject:
- food coloring; plant extracts; anthocyanins; phenolic compounds; color; pH; light; temperature; spectral analysis
- Abstract:
- ... Anthocyanin extracts are increasingly used as food ingredients. A current challenge is to maintain their color properties. The stability of some colorants has been studied in sugar and non-sugar drink models at three pH values (3, 4, and 5) under thermal and light conditions simulating rapid food aging. At a given pH, color stability mainly depends on the structures of anthocyanins and of colorles ...
- DOI:
- 10.1021/jf000791o
- PubMed:
- 11170573
-
http://dx.doi.org/10.1021/jf000791o
- Author:
- Hamburg, A.; Puvanesarajah, V.; Burnett, T.J.; Barnekow, D.E.; Premkumar, N.D.; Smith, G.A.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 146-155
- ISSN:
- 0021-8561
- Subject:
- chemical degradation; biochemical pathways; metabolism; foliar application; land application; Triticum aestivum; Solanum tuberosum; Raphanus sativus; Lactuca sativa; herbicide residues
- Abstract:
- ... The fate of 2,4-dichlorophenoxyacetic acid (2,4-D) applied foliarly as the 2-ethylhexyl ester (EHE) to wheat and potatoes, to the soil as the dimethylamine (DMA) salt under apple tree canopies, and preplant as the free acid for wheat, lettuce, and radish was studied to evaluate metabolic pathways. Crop fractions analyzed for 14C residues included wheat forage, straw, and grain; potato vine and tub ...
- DOI:
- 10.1021/jf000120q
-
http://dx.doi.org/10.1021/jf000120q
- Author:
- Chung, H.Y.; Yung, I.K.S.; Kim, J.S.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 192-202
- ISSN:
- 0021-8561
- Subject:
- boiling; volatile compounds; chemical composition; interspecific variation; Pectinidae; food preparation; food composition; scallops; dried foods
- Abstract:
- ... Comparison of two types of dried scallops, Chlamys farreri and Patinopecten yessoensis, and effects of preparation methods (boiling and steaming) on the composition of their volatile components were carried out by simultaneous steam distillation and extraction and with analysis by gas chromatography-mass spectrometry. One hundred and seventy-two compounds were identified, three tentatively. Qualit ...
- DOI:
- 10.1021/jf000692a
- PubMed:
- 11170577
-
http://dx.doi.org/10.1021/jf000692a
- Author:
- Wang, D.; Wang, C.; Li, J.; Zhao, G.
- Source:
- Journal of agricultural and food chemistry 2001 v.49 no.1 pp. 507-510
- ISSN:
- 0021-8561
- Subject:
- tea; Camellia sinensis; shoots; polysaccharides; glycoproteins; molecular weight; blood glucose; diabetes
- Abstract:
- ... Coarse tea contained a high content of polysaccharide complex. Composed of polysaccharide and protein, the polysaccharide complex from tea (TPS) belonged to glycoprotein with the molecular weight () of (10.7-11.0) x 10(4). When mice (7 weeks old, C57BL/8) were injected with TPS, the levels of blood glucose (BG) in normal mice and model mice with high BG were decreased significantly by averages of ...
- DOI:
- 10.1021/jf000029m
- PubMed:
- 11170619
-
http://dx.doi.org/10.1021/jf000029m