Ascorbic chemistry

Buettner, G. R. and Schafer, F. Q. Ascorbate (Vitamin C), its Antioxidant Chemistry. The Virtual Free Radical School for Oxygen Society Powerpoint presentation. http //www.healthcare. uiowa.edu/corefacilities/esr/publications/buettnerpubs/pdPBuettner-Ascorbate-Chemistry-l.pdf (accessed on 2002)... 

C. Bauemfeind, ia Ascorbic Acid Chemistry, Metabolism, and Eses, P. A. Seib and B. M. Tolbert, eds., American Chemical Society, Washington,... 

Haworth, W.N. Hirst, E.L. (1933) Synthesis of Ascorbic Acid. Chemistry Industry (London), 645-646. 

Martell, A.E. (1982). Chelates of ascorbic acid formation and catalytic properties. In Ascorbic Acid Chemistry, Metabolism and Uses (eds. P. Seib and B. Tolbert) Advanced Chemistry Series No. 200, p. 153, American Chemical Society, Washington DC. 

Figure 2 Selective electrochemical detection of a mixture on multielectrode amper-ometry. AA = Ascorbic acid, NE = norepinephrine, DOPAC = 3-4-dihydroxy-phenylacetic acid, E = epinephrine bitartrate, 5-HIAA = 5-hydroxyindole-3-acetic acid, HVA = homovanillic acid, TRP = tryptophan, 5-HT = 5-hydroxytryptamine, and 3-MT = 3-methoxytyramine (separated by RPLC). Detection was with a 4-electrode glassy carbon array, with electrode 1 at 500 m V) electrode 2 at 700 mV, electrode 3 at 900 mV, and electrode 4 at 1100 mV. Note that at electrode 1, HVA, TRP, and 3-MT are not seen. At electrode 2, only TRP is not seen. A standard calomel electrode was used as reference. (Reprinted with permission from Hoogvliet, J. C., Reijn, J. M., and van Bennekom, W. P., Anal. Chem., 63, 2418, 1991. 1991 Analytical Chemistry.)...

Asami, D.K., Flong Y.-J., Barret D.M. and Mitchell A.E. (2003). Comparison of the total phenolic and ascorbic acid content of freeze-dried and air-dried marionberry, strawberry, and com grown using conventional, organic, and sustainable agricultural practices , Journal of Agricultural Food Chemistry, 51, 1237-1241. 

Senesi N, Loffredo E (1999) The chemistry of soil organic matter. In Sparks DL (ed) Soil physical chemistry. CRC Press, Boca Raton, FL, pp 239-370 Sujatha TV, Hegde MJ (1998) C-mitotic effects of Trichloroethylene (TCE) on bone marrow cells of mice. Mutat Res 413 151-158 Varanini Z, Pinton R (2001) Direct versus indirect effects of soil humic substances on plant growth and nutrition. In Pinton R, Varanini Z, Nannipieri P (eds) The rizosphere. Marcel Dekker, Basel, pp 141-158 Vijayalaxmi KK, Venu R (1999) In vivo anticlastogenic effects of L-ascorbic acid in mice. Mutat Res 438 47-51... 

S / V CONTENTS Preface, Robert W. Hay. Structure and Function of Manganese-Containing Biomolecules, David C. Weather-bum. Repertories of Metal Ions as Lewis Acid Catalysts in Organic Reactions, Junghan Suh. The Multicopper-Enzyme Ascorbate Oxidase, Albrecht Messerschmidt. The Bioinorganic Chemistry of Aluminum, Tomas Kiss and Etelka Farkas. The Role of Nitric Oxide in Animal Physiology, Anthony R. Butler, Frederick Flitney and Peter Rhodes. Index. 

Fig. 6. Dynamical phase diagram of the ascorbic acid/copper(II)/oxygen system in a CSTR in the kf — [Cu2+]0 plane. Fixed reactor concentrations [H2Asc]0 = 5.0x10 4M [H2SO4]0 = 6.0 x 10-5 M [Na2SO4]0 = 0.04M. Symbols O, steady state , oscillations , bistability. The asterisk ( ) marks the Takens-Bogdanov point. Strizhak, P. E. Basylchuk, A. B. Demjanchyk, I. Fecher, F. Shcneider, F. W. Munster, A. F. Phys. Chem. Chem. Phys. 2000, 2, 4721. Reproduced by permission of The Royal Society of Chemistry on behalf of the PCCP Owner Societies.

Nitro groups can be reduced all the way to amines (Fig. 5.7). The first step requires an enzyme such as cytochrome P450 or anaerobic bacteria, but reduction of nitroso groups is so facile it is usually a simple chemical reduction mediated by biological reducing agents such as ascorbate or NADPH. Although the pathways are shown as two-electron oxidations and reductions, one-electron chemistry can also occur. 

The most employed redncing agents in the old tellurium chemistry were alkali sulphites or hydrogen snlphites, methylmagnesinm iodide and sodinm snlphide hydrate. The last reagent is still nsed, together with the more recently introdnced sodium borohydride, TUDO, hydrazine, samarinm diiodide and sodium ascorbate. ... 

Finlay, M., Dale, B., Griffiths, D. W., Todd, D. T. (2003). Effects of genotype, environment, and postharvest storage on the total ascorbate content of potato Solanum tuberosum) tubers. Journal of Agricultural and Food Chemistry, 51,244-248. 

Figure 33. Principle of proton-driven uphill transport for dopamine under a countertransport mode. The concentration of the carrier lasalocid A in o-dichlorobenzene was 0.1 M. The feed phase (100 ml) was 10 mM Tris-HCI buffer solution (pH 7.4) containing 1 mM ascorbic acid. The receiving phase (0.5-2.0 ml) was a hydrochloric acid solution (pH 0.5-3.0). The initial dopamine concentration in the feed solution was in the range from 1.00 x 10 to 1.00 x 10 M (reprinted with permission from Anal. Sci. 1996, 12, 333. Copyright 1996 The Japan Society for Analytical Chemistry).

Cort, W. M. In Ascorbic Acid Chemistry, Metabolism, and Uses Seib, P. A. Tolbert, B. M., Eds. Advances in Chemistry Series No. 200 American Chemical Society Washington, DC, 1982 pp 533-550. 

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