The amino acid constituents are linked to each other in a linear sequence via substituted amide bonds. Unlike the glycosidic bonds polysaccharides and phosphodiester nucleic acids, which single bonds, linkage proteins is partial double bond, further underscores unique structural property of protein polymers. This chapter discusses both desirable undesirable effects food processing on proteins. It describes heat treatments chemical changes in, functional properties diverse biological...

ABSTRACT Two potato cultivars (Kennebec and Simcoe) one selection (ND 860–2) were stored for 3 months at 4°, 9° 11°C. ND 860–2 had the lowest sugar content all storage temperatures, produced lightest colored chips was only sample which gave acceptable directly from 4°C storage. In another study, three (Norchip, Simcoe Onaway) evaluated chip color during growth harvest, two weeks prior after foliar senescence, under various time —‐ temperature regimes upon reconditioning. generally levels of...

Pure thiosulfinates, R−S(O)S−R (2), where R = Me (2a), Pr (2b), or All (2c), at levels up to 4 mM were not capable of scavenging hydrogen peroxide superoxide anion. Relative standard antioxidants (ascorbic acid, n-propyl gallate, butylated hydroxytoluene, Trolox, and reduced glutathione), these thiosulfinates 1−3 orders magnitude less efficient reducing 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical, 0.5−2 quenching singlet oxygen, about equally effective hydroxyl radical. Generally,...

Thiosulfinates (TSs) have been implicated as a principle source of the antiplatelet property raw onion and garlic juice. The in vitro responses human platelets to dosages four TSs were measured using whole blood aggregometry compared by regression analysis. Of compounds evaluated, methyl methane-TS (MMTS), propyl propane-TS (PPTS), 2-propenyl 2-propene-TS (allicin) are present freshly cut Allium vegetables, whereas ethyl ethane-TS (EETS) has not detected. All synthesized model reaction...

Free-radical scavenging, reducing, and phase II enzyme-inducing activities of aqueous 5% ethanol extracts freeze-dried root tissue four beet (Beta vulgaris L.) strains (red, white, orange, high-pigment (red) phenotypes) were determined. Aqueous ethanolic the regular red phenotypes most capable inhibiting metmyoglobin/H2O2-mediated oxidation 2-2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) 2,2'-azobis-(2-amidinopropane) dihydrochloride (AAPH)-mediated bleaching β-carotene. These...

Abstract Abstract: Crude aqueous and ethanolic extracts of root tissue red (Rd) high-pigment (HP) beet (Beta vulgaris L.) strains exhibited antioxidant phase II enzyme-inducing activities, these were fractionated using Sephadex LH-20 chromatography. These bioactivities tended to become co-enriched in early late eluting fractions, comprising 5-25% the material recovered from column. Liquid chromatography-mass spectrometry (MS) was used resolve identify multiple betalain components most potent...

Chilling at 4 degrees C in the dark induced lipid degradation cucumber (Cucumis sativa L.) fruit upon rewarming 14 C. Rates of ethane evolution by fruits rewarmed after 3 days chilling were up to four-fold higher than those evolved unchilled (14 C) (0.02-0.05 picomoles gram fresh weight(-1) hour(-1)). This potentiation peroxidation occurred prior irreversible injury (requiring 7 chilling) as indicated increases ethylene and visual observations. Decreases unsaturation peel tissue glycolipids...

ABSTRACT A modified atmosphere (MA) of 80% CO 2 and 20% air was effective in extending shelf life fresh rockfish fillets. Aerobic plate counts trimethylamine levels were significantly lower (P < 0.1%) for the fillets held MA compared to those air. decline surface pH observed on stored MA, presumably due absorption its hydration carbonic acid. Oxidation‐reduction potentials suggested a more aerobic environment MA. There no significant differences weight loss between control samples....

Two Gram-negative, rod-shaped, halophilic archaea, designated strains HIS40-3T and HDS3-1, were isolated from anchovy fish sauce (nam-pla) collected two different locations in Thailand. The able to grow at 20–60 °C (optimum 37–40 °C), 1.7–5.1 M NaCl 2.6–3.4 NaCl) pH 5.5–8.5 6.0–6.5). Hypotonic treatment with less than 1.7 caused cell lysis. major polar lipids of the isolates C20C20 C20C25 derivatives phosphatidylglycerol, phosphatidylglycerol phosphate methyl ester, sulfate, glycolipids one...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTQuantification of Alk(en)yl-L-cysteine Sulfoxides and Related Amino Acids in Alliums by High-Performance Liquid ChromatographyDavid J. Thomas Kirk L. ParkinCite this: Agric. Food Chem. 1994, 42, 8, 1632–1638Publication Date (Print):August 1, 1994Publication History Published online1 May 2002Published inissue 1 August 1994https://pubs.acs.org/doi/10.1021/jf00044a010https://doi.org/10.1021/jf00044a010research-articleACS PublicationsRequest reuse...

Abstract Abstract: Twenty-seven selenium compounds and sixteen structurally related organosulfur were tested for quinone reductase (QR) glutathione-S-transferase (GST) inducing activity in murine hepatoma (Hepa 1c1c7) cells. Sixteen able to double QR activity, seven of them also doubled GST activity. The nine most potent compounds, dimethyl diselenide, 2,5-diphenyl- selenophene, dibenzyl methylseleninic acid, diphenyl benzeneseleninic benzene selenol, triphenylselenonium chloride, ebselen...

A murine hepatoma (Hepa 1c1c7) cellular bioassay was used to guide the isolation of phase II enzyme inducers from fermented soy sauce, using quinone reductase (QR) as a biomarker. crude ethyl acetate extract, accounting for 8.7% nonsalt soluble solids found double relative QR specific activity at 25 μg/mL (concentration required defined "CD value"). Further silica gel column fractionation yielded 17 fractions, 16 which exhibited CD values induction <100 μg/mL. The four most potent fractions...