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You searched for: Journal name Journal of agricultural and food chemistry Remove constraint Journal name: Journal of agricultural and food chemistry Publication year rev 7998-2002 Remove constraint Publication year rev: 7998-2002 Source 2002 v.50 no.10 Remove constraint Source: 2002 v.50 no.10
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1. Advantages of using non-isothermal bioreactors in agricultural waste water treatment by means of immobilized urease. Study on the influence of spacer length and immobilization method

Author:
El Sherif, H.; Di Martino, S.; Travascio, P.; De Maio, A.; Portaccio, M.; Durante, D.; Rossi, S.; Canciglia, P.; Mita, D.G.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2802-2811
ISSN:
0021-8561
Subject:
urease; nylon; heterocyclic nitrogen compounds; hydrazine; bioreactors; wastewater treatment; enzyme activity; urea; hydrolysis; immobilized cells
Abstract:
... The behavior of three different catalytic membranes, obtained by immobilizing urease on nylon sheets chemically grafted with methyl methacrylate, was studied in a bioreactor operating under isothermal and non-isothermal conditions. Membrane activation was carried out by condensation or acyl azide reaction, and spacers of different lengths, such as hexamethylendiamine or hydrazine, were used. Under ...
DOI:
10.1021/jf010951b
PubMed:
11982403

2. Antioxidant activity of phenolic compounds isolated from Mesona procumbens Hemsl

Author:
Hung, C.Y.; Yen, G.C.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2993-2997
ISSN:
0021-8561
Subject:
linoleic acid; caffeic acid; humans; assays; lipid peroxidation; Lamiaceae; plant extracts; erythrocytes; cell membranes; oxidation
Abstract:
... The antioxidant activity of phenolic compounds isolated from Mesona procumbens Hemsl. (Hsian-tsao) was investigated. Hsian-tsao was extracted with various solvents, and the results showed that the fraction treated with acidic ethyl acetate (pH 2) possessed large amounts of phenolic compounds and a strong antioxidant activity on peroxidation of linoleic acid. The antioxidant activity (inhibition of ...
DOI:
10.1021/jf011454y
PubMed:
11982431

3. Antioxidant and antiproliferative activities of raspberries

Author:
Liu, M.; Li, X.Q.; Weber, C.; Lee, C.Y.; Brown, J.; Liu, R.H.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2926-2930
ISSN:
0021-8561
Subject:
anthocyanins; raspberries; cultivars; humans; liver neoplasms; cell division; Rubus idaeus; color; oxidation; medicinal properties; cell lines; fruit juices; antioxidant activity; phenolic compounds
Abstract:
... Raspberries are rich in phenolic phytochemicals. To study the health benefits of raspberries, four fresh raspberry varieties (Heritage, Kiwigold, Goldie, and Anne) were evaluated for total antioxidant and antiproliferative activities. The total amount of phenolics and flavonoids for each of the four raspberry varieties was determined. The Heritage raspberry variety had the highest total phenolic c ...
DOI:
10.1021/jf0111209
PubMed:
11982421

4. Antioxidant capacity of honeys from various floral sources based on the determination of oxygen radical absorbance capacity and inhibition of in vitro lipoprotein oxidation in human serum samples

Author:
Gheldof, N.; Engeseth, N.J.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 3050-3055
ISSN:
0021-8561
Subject:
honey; phenolic compounds; oxidation; assays; oxygen; free radicals; lipoproteins; blood serum; humans; antioxidant activity
Abstract:
... Honeys from seven different floral sources were analyzed for in vitro antioxidant capacity and total phenolic content. Antioxidant capacity was measured by the oxygen radical absorbance capacity (ORAC) assay and by monitoring the formation of conjugated dienes as an index of the inhibition of copper-catalyzed serum lipoprotein oxidation. ORAC values ranged from 3.1 to 16.3 micromol Trolox equivale ...
DOI:
10.1021/jf0114637
PubMed:
11982440

5. Application of a monoclonal antibody-based enzyme-linked immunosorbent assay for the determination of ractopamine in incurred samples from food animals

Author:
Shelver, W.L.; Smith, D.J.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2742-2747
ISSN:
0021-8561
Subject:
growth promotion; feed additives; monoclonal antibodies; drug residues; liver; urine; cattle; sheep; enzyme-linked immunosorbent assay; beta-adrenergic agonists
Abstract:
... A monoclonal antibody-based ractopamine immunoassay has been applied to incurred samples from sheep and cattle. Results obtained by immunoassay were compared with those from high-performance liquid chromatography (HPLC). Three sets of sample extracts containing primarily unmetabolized ractopamine were analyzed. Correlation of HPLC with enzyme-linked immunosorbent assay (ELISA) for beef liver sampl ...
DOI:
10.1021/jf011372+
PubMed:
11982392

6. Characteristic odor components of Citrus sphaerocarpa Tanaka (Kabosu) cold-pressed peel oil

Author:
Tu, N.T.M.; Onishi, Y.; Choi, H.S.; Kondo, Y.; Bassore, S.M.; Ukeda, H.; Sawamura, M.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2908-2913
ISSN:
0021-8561
Subject:
Citrus; citrus fruits; essential oils; pressing; cold; volatile compounds; odors; citronellal
Abstract:
... The volatile components of Citrus sphaerocarpa Tanaka (Kabosu) cold-pressed peel oil were investigated by chemical and sensory analyses. Monoterpene hydrocarbons (more than 94.6%) were predominant in Kabosu peel oil, with limonene and myrcene accounting for the major proportions (70.5% and 20.2%, respectively). The Kabosu oxygenated fraction was characterized by quantitative abundance in aldehydes ...
DOI:
10.1021/jf011578a
PubMed:
11982418

7. Characterization of the aroma of a meatlike process flavoring from soybean-based enzyme-hydrolyzed vegetable protein

Author:
Wu, Y.F.G.; Cadwallader, K.R.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2900-2907
ISSN:
0021-8561
Subject:
soybean meal; soy protein; proteolysis; proteinases; free amino acids; volatile compounds; meat; flavor; odors; flavorings
Abstract:
... Defatted soybean meal was converted into enzyme-hydrolyzed vegetable protein (E-HVP) using the proteolytic enzyme Flavorzyme. Total free amino acids increased by 40-fold after enzyme hydrolysis, with leucine being the most abundant, followed by phenylalanine, lysine, glutamine/glutamic acid, and alanine. Volatile components from a meatlike process flavoring made from E-HVP were isolated by direct ...
DOI:
10.1021/jf0114076
PubMed:
11982417

8. Comparison of different egg albumen fractions as sources of ovomucin

Author:
Hiidenhovi, J.; Makinen, J.; Huopalahti, R.; Ryhanen, E.L.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2840-2845
ISSN:
0021-8561
Subject:
egg albumen; fractionation; filtration; byproducts; mucins
Abstract:
... Ovomucin was fractionated from whole egg albumen, thick egg albumen, liquid egg albumen, and a liquid egg albumen filtration byproduct by using the isoelectric precipitation method. The amounts of ovomucin measured in the above-mentioned fractions were 280, 340, 500, and 520 mg per 100 g of albumen, respectively. There was great variation between the beta-ovomucin contents of the different albumen ...
DOI:
10.1021/jf011333y
PubMed:
11982409

9. Enzymatic modification of pectin to increase its calcium sensitivity while preserving its molecular weight

Author:
Hotchkiss, A.T. Jr.; Savary, B.J.; Cameron, R.G.; Chau, H.K.; Brouillette, J.; Luzio, G.A.; Fishman, M.L.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2931-2937
ISSN:
0021-8561
Subject:
pectins; pectinesterase; enzyme activity; molecular weight; viscosity; calcium; galacturonic acid
Abstract:
... A commercial high-methoxy citrus pectin was treated with a purified salt-independent pectin methylesterase (PME) isozyme isolated from Valencia orange peel to prepare a series of deesterified pectins. A series of alkali-deesterified pectins was also prepared at pH 10 under conditions permitting beta-elimination. Analysis of these pectins using high-performance size exclusion chromatography (HPSEC) ...
DOI:
10.1021/jf011187w
PubMed:
11982422

10. Furosine: a suitable marker for assessing the freshness of royal jelly

Author:
Marconi, E.; Caboni, M.F.; Messia, M.C.; Panfili, G.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2825-2829
ISSN:
0021-8561
Subject:
chemical composition; lysine; Maillard reaction products; food quality; royal jelly; storage; dietary supplements
Abstract:
... Fifteen commercial samples of royal jelly, consisting of 10 imported samples, and 5 samples of known origin obtained freshly harvested from beekeepers, were analyzed for protein, lysine, and furosine content. In addition, a commercial sample of royal jelly, at the beginning of its commercial shelf life, was stored for 10 months both at 4 degrees C and at room temperature in order to assess the dev ...
DOI:
10.1021/jf0114987
PubMed:
11982406

11. Gelling properties of heat-denatured beta-lactoglobulin aggregates in a high-salt buffer

Author:
Vittayanont, M.; Steffe, J.F.; Flegler, S.L.; Smith, D.M.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2987-2992
ISSN:
0021-8561
Subject:
sodium phosphate; buffers; storage modulus; salinity; gels; denaturation; sodium chloride; temperature; beta-lactoglobulin; heat treatment; gelation
Abstract:
... Thermal denaturation, rheological, and microstructural properties of gels prepared from native beta-lactoglobulin (beta-LG) and preheated or heat-denatured beta-LG (HDLG) aggregates were compared. The HDLG was prepared by heating solutions of 4% beta-LG in deionized water, pH 7.0, at 80 degrees C for 30 min and then diluted to the desired concentration in 0.6 M NaCl and 0.05 M phosphate buffer at ...
DOI:
10.1021/jf011410p
PubMed:
11982430

12. Honey from plants containing pyrrolizidine alkaloids: a potential threat to health

Author:
Edgar, J.A.; Roeder, E.; Molyneux, R.J.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2719-2730
ISSN:
0021-8561
Subject:
honey; poisonous plants; pyrrolizidine alkaloids; food contamination; risk assessment
Abstract:
... Following scientific risk assessments, several countries have imposed strict regulations on herbal medicines containing 1,2-dehydro-pyrrolizidine alkaloids. Using published data on the plants used in honey production, pyrrolizidine alkaloid-containing plants are shown in this review to represent a significant source of honey worldwide. This observation, honey consumption data, reported levels of p ...
DOI:
10.1021/jf0114482
PubMed:
11982390

13. Identification of radical scavengers in sweet grass (Hierochloe odorata)

Author:
Pukalskas, A.; Beek, T.A. van.; Venskutonis, R.P.; Linssen, J.P.H.; Veldhuizen, A. van.; Groot, A. de.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2914-2929
ISSN:
0021-8561
Subject:
heterocyclic oxygen compounds; chemical reactions; free radicals; plant extracts; free radical scavengers; Poaceae; leaves; shoots
Abstract:
... Extracts from aerial parts of sweet grass (Hierochloe odorata) were active DPPH free radical scavengers. The active compounds were detected in extract fractions using HPLC with on-line radical scavenging detection. After multistep fractionation of the extract, two new natural products possessing radical scavenging activity were isolated, and their structures were elucidated by NMR and MS. They wer ...
DOI:
10.1021/jf011016r
PubMed:
11982419

14. Influence of Maillard reaction products on DNA damage in human lymphocytes

Author:
Yen, G.C.; Liao, C.M.; Wu, S.C.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2970-2976
ISSN:
0021-8561
Subject:
lysine; glutathione; genotoxicity; humans; free radicals; xylose; glucose; DNA; Maillard reaction products; lymphocytes; hydrogen peroxide; lipid peroxidation; guanine; catalase; glutathione peroxidase; fructose; enzyme activity
Abstract:
... The effect of Maillard reaction products (MRPs) on induced DNA damage in human lymphocytes was investigated using single-cell gel electrophoresis (comet assay). Three MRPs, Xyl-Lys MRP, Glu-Lys MRP, and Fru-Lys MRP, were prepared by heating lysine with xylose, glucose, and fructose, respectively, at pH 9.0 and 100 degrees C for 3 h and called undialyzed MRPs. The prepared MRPs were further dialyze ...
DOI:
10.1021/jf0113474
PubMed:
11982427

15. Kinetics of reduction of ferrylmyoglobin by (-)-epigallocatechin gallate and green tea extract

Author:
Hu, M.; Skibsted, L.H.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2998-3003
ISSN:
0021-8561
Subject:
extracts; polyphenols; tea; myoglobin; flavanols; antioxidants
Abstract:
... The hypervalent heme pigment ferrylmyoglobin, a potential prooxidant in muscle tissue and meat, is efficiently reduced by epigallocatechin gallate (EGCG) from green tea and by green tea polyphenol extract (GTP) in neutral or moderately acidic aqueous solution (0.16 M NaCl) to yield metmyoglobin in two parallel processes. The second-order rate constant for direct reduction at pH 7.4 and 25 degrees ...
DOI:
10.1021/jf011535u
PubMed:
11982432

16. Mycotoxin production by Fusarium avenaceum strains isolated from Norwegian grain and the cytotoxicity of rice culture extracts to porcine kidney epithelial cells

Author:
Morrison, E.; Kosiak, B.; Ritteni, A.; Aastvett, A.H.; Uhlig, S.; Bernhoft, A.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 3070-3075
ISSN:
0021-8561
Subject:
rice; biosynthesis; cytotoxicity; mycotoxins; Fusarium avenaceum; kidneys; extracts; cell lines; epithelium; swine; Norway
Abstract:
... The secondary metabolites of 24 isolates of Fusarium avenaceum from Norwegian cereals and grown on rice have been characterized. Moniliformin (MON), enniatins (ENNs), and beauvericin (BEA) were analyzed by high-performance liquid chromatography. Porcine kidney epithelial cells (PK15, American Type Culture Collection) were used to study the cytotoxicity of MON in the extracts. The following metabol ...
DOI:
10.1021/jf011532h
PubMed:
11982443

17. Postcolumn derivatization method for determination of reducing and phosphorylated sugars in chicken by high performance liquid chromatography

Author:
Allani, M.; Farmer, L.J.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2760-2766
ISSN:
0021-8561
Subject:
reducing sugars; sugar phosphates; chicken meat; alkaline phosphatase; enzyme activity; high performance liquid chromatography; phosphates
Abstract:
... A postcolumn derivatization method is described for determination of reducing sugars and phosphorylated reducing sugars from chicken meat and other foods using high-performance liquid chromatography (HPLC). Reducing sugars are extracted with ethanol/water, separated on a Kromasil amine-bonded column by isocratic analysis using acetonitrile/water as the mobile phase, and, after postcolumn reaction ...
DOI:
10.1021/jf011335i
PubMed:
11982395

18. Purification and glycosylation analysis of an acidic pectin methylesterase in jelly fig (Ficus awkeotsang) achenes

Author:
Ding, J.L.C.; Hsu, J.S.F.; Wang, M.M.C.; Tzen, J.T.C.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2920-2925
ISSN:
0021-8561
Subject:
chemical composition; glycoproteins; Ficus; pectinesterase; hexoses; molecular weight; enzyme activity
Abstract:
... An acidic pectin methylesterase (PME) is responsible for the gelation of water extract from jelly fig (Ficus awkeotasang) achenes. A new, fast and efficient, method has been developed to purify this acidic PME. The method includes preparing jelly curd by traditional hand washing, extracting proteins from the curd, and separating PME by anion-exchanger. The purified PME exists as a monomer of 38 kD ...
DOI:
10.1021/jf010845+
PubMed:
11982420

19. Recovery and characterization of the metal polymeric organic fraction (polymerin) from olive oil mill wastewaters

Author:
Capasso, R.; De Martino, A.; Arienzo, M.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2846-2855
ISSN:
0021-8561
Subject:
chemical composition; polyphenols; polysaccharides; plant pigments; monosaccharides; olive oil; amino acids; industrial effluents; polymers; metals; wastewater; plant proteins
Abstract:
... A dark and complex metal polymeric organic mixture, named polymerin, was recovered from olive oil mill wastewaters (OMWW) and characterized by chemical analysis, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and atomic absorption spectrometry (AAS). Polymerin proved to be composed of carbohydrates (52.40 mg 100(-1), w/w), melanin (26.14 mg 100(-1)), and proteins (10.40 mg 1 ...
DOI:
10.1021/jf011442c
PubMed:
11982410

20. Analysis of fumonisin B1 in Fusarium proliferatum-infected asparagus spears and garlic bulbs from Germany by liquid chromatography-electrospray ionization mass spectrometry

Author:
Seefelder, W.; Gossmann, M.; Humpf, H.U.
Source:
Journal of agricultural and food chemistry 2002 v.50 no.10 pp. 2778-2781
ISSN:
0021-8561
Subject:
Asparagus officinalis; Fusarium proliferatum; fumonisins; garlic; food contamination; liquid chromatography; mass spectrometry; fungal diseases of plants; Germany
Abstract:
... Fusarium proliferatum is one of a group of fungal species that produce fumonisins and is considered to be a pathogen of many economically important plants. The occurrence of fumonisin B1 (FB1) in F. proliferatum-infected asparagus spears from Germany was investigated using a liquid chromatography-electrospray ionization mass spectrometry (LC-ESI-MS) method with isotopically labeled fumonisin FB1-d ...
DOI:
10.1021/jf0115037
PubMed:
11982398