Les Colloques, n°69

Polyphenols 94

17th International Conference on Polyphenols

Palmade Mallorca (Spain), May 23-27,1994 d (V

Contents

Opening lecture

Plant polyphenols and their role in plant defence mechanisms 19

Harborne J.B.

Plenary lectures

Do proanthocyanidins and NMR spectroscopists make an irreversiblecomplexation? 29Vercauteren J.Complexation and oxidative transformation of polyphenolsHaslamE. 45

Biosynthesis of phenolic compounds: involvement of cytochrome P450 enzymes 57Durst F., Werck-Reichhart D.

Induction of polyphenol biosynthesis in plants during development andenvironmental stress 67Heller W., Ernst D., Langebartels C, Sandermann H.Jr.

The flavonol sulfotransferase family: from metabolites to genes 79Ibrahim R.K., Ananvoranich S., Varin L., Gulick P.J.

Enterobactin and related catechol siderophores 89ShanzerA., Tor Y, Libman J., Lifson S., Felder C.E.

Ligninase and manganese peroxidase models based on syntheticmetalloporphyrin complexes 101Meunier B.

Bioactive lignans and flavonoids from traditional medicines 113Nishibe S.

Antitumor and related activities of ellagitannin oligomers 123Yoshida T., Hatano T., Miyamoto K. I., Okuda T.

Search for bioactive polyphenols from higher plants 133Hostettmann K., Marston A., Wolfender J.-L.

Electrodriven separations: possibilities for the analysing phenols and polyphenols.. 143Sandra P.

Communications

Part one: Polyphenols of plants and of their transformation products

Characterization of grape seed oligomeric and polymeric tannins using thiolysis.... 155Prieur C.RigaudJ., Cheynier V., Moutounet M.

Characterization of caffeic acid oxidation products 157Fulcrand H., Cheminat A., Brouillard R., Cheynier V.

Action of polyphenoloxidases on anthocyanins and other polyphenols inananassa fruit tissues 159Cano M.P., De Ancos B., Monreal M.

Effect of pH on the formation of (+)-catechin oxidation products in modelsystems containing grape polyphenol oxidase 161Guyot S., Cheynier V., Moutounet M.

Extraction and characterization of PPOin a microalgae 163Renimel I., Deschamps F., Andre" P.

A new, effective and rapid procedure for purification of apple polyphenoloxidase using SDS-proteinase K digestion 165MarquesL., FleurietA., Cleyet-MarelJ.C, MacheixJ.J.

Effect of carotenes on enzymatic browning of chlorogenic acid and tyrosine 167Kim M.J., Smith N.L., Lee C. Y.

Inhibition of horse bean (Viciafaba L.) lipoxygenase by some phenolicstructures 169Hugues M., Richard-Forget F., Thiry J.M., Boivin P., Nicolas J.

Labiatae flavonoids as food antioxidants 171Gil M.I., Montijano H., Ferreres F., Tomas-Lorente F., Tomas-Barberan F.A.

Evolution of UV-spectra during enzymatic oxidation of white grape juices 173KontekA., KontekA.

Influence of the oxygen concentration in the phenol content of alpechindegraded by Aspergillus terreus 175Ramos Cormenzana A., Garcia Pareja M.P., Garrido Hoyos S.E., Martinez Nieto L.

Inhibitory effect of (+)-catechin oxidation products on endo-polygalacturonaseof Aspergillus niger 177Guyot S., Pellerin P., BrillouetJ.M., Cheynier V., MoutounetM.

Antioxidant activity of canola phenolics 179ShahidiF., Wanasundara W.M.U.N.

Oxidation of anthraquinones with lead (IV) tetraacetate 181Danielsen K., Francis G.W., Aksnes D.W.

Apple phenolic compounds and enzymatic oxidation in model solutions by applepolyphenoloxidase 183Goupy P., Amiot M.J., Aubert S., Nicolas J.

Chromatographic separation of individual tea catechins and evaluation of theirantioxidant activity 185Shahidi F., Amarowicz R.

Proton dissociation and tautomeric constants of apigeninidin 187Costantino L., Rastelli G., Rossi M.C.

A quantitative description of intramolecular copigmentation interactions withinthe Pharbitis anthocyanin family 189Dangles O., Saito N., BrouillardR.

Inclusion complexes of flavonoids into natural and chemically modified fi-cyclodextrins 191Stoeckel C, Dangles O., BrouillardR.

Synthesis of 3-glycosylated flavylium ions. Influence of the glycosyl group onthe chemical reactivity of anthocyanins in water 193Elhajji H., Dangles O., Brouillard R.

Colour evolution of anthocyanins in saccharose solutions with other phenoliccompounds 195Amiot M.J., Aubert S.

Association anthocyane-acide ascorbique et couleur de purees de fruits 197Aubert S., Amiot-Carlin M.J.

The effect of light, temperature and microenvironments on the transformation ofkaempferol and pelargonidin 199Monici M., Baglioni P., Mulinacci N., Baldi A., Vincieri F.F.

Spectacular colour modification in a Lathyrus hybrid - A chemicalrationalization 201Markham K.R., Mitchell K.A.

Detection of new pigments formed in the anthocyanin-catechin condensationreactions 203Santos-Buelga C., Bravo Ham S., Ortega Meder D., Guerra T., Rivas Gonzalo J. C.

Co-pigmentation of anthocyanins through the formation of ion pairs 205Figueiredo P., Pina F.

Dynamics of the anthocyanins in "Cannonau" grapevine as related to theenvironmental conditions 207Deidda P., Nieddu G., Pellizzaro G., Pia G.

Polymerization of anthocyanins in fruit juices 209Zajac K.B., Wilska-Jeszka J.

Chlorogenic acid interaction with anthocyanins of chokeberries and strawberries ...211Wilska-Jeszka J., Korzuchowska A.

Evolution of pomegranate juice anthocyanins during fruit ripening andpostharvest storage 213Gil M.I., Garcia-Viguera C, Soler C, Artes F., Tomas-Barberan F.A.

Furanocoumarins in fruits of Angelica archangelica and Pastinaca sativa underdifferent environmental conditions 215GlowniakK., Wierzchowska-Renke K., Zgorka G., Sawicka W., Zobel A.M.

Les tanins de l'&orce de grenade de Tunisie : Preponderance desproanthocyanidines 217Ben Nasr C., Ayed N., Metche M.

Associations des proanthocyanidines de l'e"corce de grenade de Tunisie avec lalaine 219Ben Nasr C., Ayed N., Metche M.

Phenolic compounds in fruit juices. Variations with different treatments 221Hernandez T., Ausin N., Estrella I., Gomez-Cordoves C, Bartolome B.,Bengoechea L., Perez-Ilzarbe F.J.

Analyse HPLC des composes polyphenoliques presents dans les raisins de Vitisvinifera L. (cv. Ancellotta) 223Romani A., Baldi A., Vincieri F.F.

Proanthocyanidin composition in skin and seed from grapes 225Escribano Bailon M. J., Guerra M. T., Rivas Gonzalo J. C., Santos Buelga C.

Extraction techniques and HPLC analysis of phenolic compounds from grapeseeds 227Kallithraka S., Garcia-Viguera C, BakkerJ., Bridle P.

Correlation between phenolic compounds and other components of the fruitduring ripening of Vitis vinifera 229Robredo L.M., Gonzalez-Sanjose M.L., Lopez-Andreu F.J., Esteban R.

Anthocyanins and watering in Vitis vinifera L 231Aguilo F., Diez C.

Orange juice differentiations using flavanone glycosides 233Mouty P.P., Gaydou E.M., Arzouyan C.R., EstienneJ.M.

The phenolic substances of Sorbus domestica L. and their importance for thequality of apple wines 235Ritter G., Hagenauer-Hener U., Dietrich H.

Influence of sulphur dioxide on yeast activity. Phenolic composition of whitewines 237Bengoechea M.L., Hernandez T., Gomez-Cordoves C.

Interaction between yZor-forming yeasts and phenolic acids 239Roggio T., Farris G.A., Vacca V., Budroni M.

Biochemical alterations of the phenolic compounds during white grapematuration, technological solutions required by primary winemaking process 241lonita V., Grecu C.

Degradation of oligomeric procyanidins during the maturation of a red wine 243Dallas C., Ricardo da Silva J.M., Laureano O.

The distinguishing polyphenolic potential of four grape varieties from Montilla-Morilesand its correlation with organoleptic properties 245Perez-Juan P.M., Barroso C.G., Morales J.

Effect of pH on the formation of coloured compounds in solutions containinganthocyanins, catechin and acetaldehyde 247Garcia-Viguera C, Bridle P., BakkerJ.

Effect of phenolic compounds on colour of Hungarian white wine 249LelikL., LeflerJ., Vitanyi G., Bihatsi-Karsai E., Panyik G.

L'estimation des nuances de la couleur des vins de qualite du centre viticoleValea Calugareasca et leur correlation avec la composition polyphSnolique 251TudoracheA., Popescu l.V, Varga M., Badea P.

Influence du degrd d'^puisement du bois sur le rapport entre les composesflavoniques et la couleur des vins rouges vieillis 253Gomez-Cordoves C, Estrella I.

Treatment of sherry dry wine with different fining agents for polyphenoliccompounds 255Barroso C.G., Bru E., Perez-Bustamante J.A.

Analysis of the main polyphenolic compounds in Brandy de Jerez 257Barroso C.G., Rodriguez M.C., Guillen D.A., ZorroL., Perez-Bustamante J.A.

Polyphenolic compounds in the browning of Sherry wines: Application of a newaccelerated browning test 259Barroso C.G., PalmaM., Perez-Bustamante J.A.

Application of LDA to the study of the polyphenolic compounds on thehyperoxidation of sherry musts 261Barroso C.G., Castro R., Perez-Bustamante J.A.

A study on the evolution and identification of polyphenolic compounds in aSherry vinegar solera system 263Barroso C. G., Galvez M. C., Moreno M. V. G., Bustamante J.A.

Analysis of major flavonoids in onions 265Park Y.K., Lee C.Y.

Procyanidins in lentils. Changes produced by different treatments 267Bartolome B., Hernandez T., Estrella 1.

Analyse HPLC des composes polyphdnoliques presents chez Olea europea L.(cv. Leccino) 269BaldiA., RomaniA., Tatti S., Mulinacci N., Vmcieri F.F.

Biodegradation of "Alpechin" polyphenols by Bacillus pumilus 123 271Garcia ParejaM.P., Garrido Hoyos S.E., Martinez NietoL., Ramos-Cormenzana A.

Analysis of honey phenolic compounds by CE and HPLC. Its application tohoney characterization 273Tomas-Barberan F.A.,. Ferreres F., Gil M.I., Garcia-Viguera C, Tomas- Lorente F.

Characterization of Portuguese honeys according to their phenolic acidcomposition 275deAndrade P.B., Roque O.L., CunhaA.P.

Identification of flavan-3-ols in black tea waste 277AtienzaJ., ClimentM.D., PonsJ.V., CerveraA.

Fractionation of thearubigins: Isolation of theacitrins 279Powell C, CliffordM.N., Opie S.C., Gibson C.L.

Comparaison entre la sube"rine des ecorces de hetre (Fagus sylvatica L.) et despellicules de kiwi (Actinidia deliciosah.) 281Ghezzi-Perra B.,HalukJ.-P., Metche M.

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Ellagitannin content of oak wood as a function of species and of samplingposition in the tree 283Masson G., PuechJ.L., Moutounet M.

Localization of ellagitannins in the wood tissues of pedunculate and sessile oaks ...285Masson G., Puech J.-L., Moutounet M.

Polyphenols in wood and bark of Eucalyptus rudis. Endl 287CondeE., Cadahia E., Garcia-Vallejo M.C.

Tannins in wood and bark of Eucalyptus camaldulensis Dehnh 289Cadahia E., CondeE., Garcia-Vallejo M.C.

Polyphenols in barks of European trees: a general survey of their nature,extractibility and content 291MilaL, ScalbertA.

Polyphenol extractives in Douglas fir wood and heartwood colour 293Dellus V., Scalbert A., Herve" du Penhoat C, Heller W.

Tannins of Picea sitchensis bark 295Matthews S., Donnelly D.M.X., ScalbertA., Rolando C, Henri du Penhoat C.

Lignins as biochemical markers of river suspension 297Pepe C, Scribe P., DagautJ., Nallard M.A., PolletB., Lapierre C.

Flavonoid characters of British hybrid taxa in Equisetum subgenus Equisetum 299VeitM., Bauer K., Beckert C, KastB., GeigerH., Czygan F.C.

Flavonoid glycosides of Geranium thunbergii Sieb. et Zucc 301Kawamura T., Hisata Y, Now Y, Nishibe S., Sakai E, Tanaka T.

Flavonoids in genus Achillea sect. Filipendulinae (Asteraceae) 303lvancheva S., Nedelcheva A.

Coumarins from Ammi huntii 305Antunes A.M., Pina Dos Santos S., Brito Palma F.

Acide rosmarinique et iridoides de Scrophularia scorodonia L 307Fernandez L., Martin T., Villaescusa L., Bartolome C, RubioB., Diaz A. M.

Derives de myricetine isoles dans les fruits de Myrtus communis L 309Martin T., Fernandez L., Rubio B., Gonzalez M., Villaescusa L., Diaz A. M.

Analyse de diosmine de plusieurs origines vege'tales 311Ramos T., Groubert A., PellecuerJ.

Isoflavonoids and chemotaxonomic markers in the genus Genista 313Van Rensen I., Veit M., Canto P., GreinwaldR., ROhner U., Czygan F.C.

HPLC analysis of polyphenols in apple tree leaves 315Picinelli A., Suarez B., Moreno J., Dapena E., Mangos J.

Tissue localization of polyphenolic metabolism in annual shoots from adult andrejuvenated walnut trees 317ClaudotA.C, DrouetA.

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The distribution of flavonoids in developing mung bean (Vigna radiata L.)organs and in seeds 319Melchior Larsen L., Olsen C.E., Wieczorkowska E.

Influence of growth site of Archangelica litoralis on furanocoumarins and oilin fruits 321V/ierzchowska-Renke K., GlowniakK., ZobelA.M.

Externally accumulated flavonoids and other lipophilic phenolics in angiosperms...323Wollenweber E.

Part two: Genetics, biochemistry and molecular biology of polyphenols

Phenylalanine and tyrosine ammonia-lyase activity in relation with bound ferulicand p-coumaric acids during durum wheat grain development 327Regnier T., MacheixJ.J.

Purification and characterization of cinnamoyl CoA reductase from Eucalyptusgunnii 329GoffnerD., Campbell M.M., BoudetA.M.

Cinnamoyl-CoA reductase and cinnamoyl alcohol dehydrogenase :characterization at the biochemical and molecular level of two enzymesinvolved in lignin synthesis 331GoffnerD., Grima-PettenatiJ., Feuillet C, BoudetA.M.

Anthocyanin synthesis induction and DFR activity in grape cell suspensions 333Dedaldechamp F., Uhel C , MacheixJ.J.

Relationship between flavonoid biosynthesis and flower colour in Rosa x hybrida..335Jay M., Chapoutier L., Dumas N., Gerland C., Raymond O., Viricel M.R.,BiolleyJ.P.

Synthesis of chalcone and aurone glucosides in Coreopsis grandiftora 337Halbwirth H., Stich K., Wurst F., Forkmann G.

Lignin composition in transgenic poplar plants with modified cinnamyl alcoholdehydrogenase activity with reference to dehydropolymer models of lignin 339TollierM.T., ChabbertB., Lapierre C, Monties B., Francesch C, Rolando C,JouaninL., Pilate G., CornuD., BaucherM., inzeD.

Expression of brown midrib mutations on lignin and cell-wall bound phenolicesters in maize 341Tollier M.T., Chabbert B., Monties B.

The metabolic fate of cinnamic acids and benzoic acids in maize microsomescatalysed by aperoxidase 343Groger W., ForsterH., Pommer U.

Biosynthese de l'acide omega-feruloyloxypalmitique dans des extraits prote"iquesde rondelles de pomme de terre en coursde cicatrisation 345Lofty S., Javelle F., Negrel J.

Characterization of a tissue-specific, sulfotransferase-like protein in Mimosapudica 347ChamberlandH., LafontaineJ., Marsolais F., Richard M., VarinL.

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Chemical, environmental and genetic manipulation of condensed tanninbiosynthesis in the herbage legume Lotus corniculatus 349Morris P.,Evans T.E., Carter E.B., Colliver S.P., Robbins M.P.

Relationship between phytohormonal treatment and content of phenoliccompounds in strawberry 351Gonzalez-Sanjose M.L., Gurruchaga M.J., Robredo L.M., Lopez-Andreu F.J.

irt three: Polyphenols and metal ions

Catalytic effect of metal ions on the polyphenol oxidation during ripe oliveprocessing 355Brenes M., Garcia P., Romero C., Garrido A.

Redox properties of phenolic compounds of interest in soil chemistry 357DeianaS., Gessa C, ManunzaB., PiloM.L, SeeberR.

Chromium (VI) reduction by caffeic acid and some derivatives 359Deiana S., Gessa C, Pistidda C, Pilo M.L, Solinas V.

Influence de certains facteurs sur la formation des combinaisons complexesentre les composes phenoliques et les ions Ar et Sn2+des vins rouges 361Avramescu M., de Chiara E.

A quantitative investigation of metal-anthocyanin complexes in aqueous solution...363Dangles O., Elhabiri M., Brouillard R.

Precipitation of cupric ions by polyphenols - Application to wood preservation 365Mila I., McDonald M., Scalbert A., Van Leemput M.

Interactions of tannin with soil mineral colloids and polyvalent cations 367Buondonno A.,AmbrosinoM.L., CoppolaE., Palmieri F.

Ellagitannins in European oak and chestnut: iron deprivation and wooddurability 369Mila I., ScalbertA., Hervi du Penhoat C, ExpertD.

'art four: Biological and pharmacological activities of polyphenols

Leaf polyphenols in pear trees infested by Psylla pyricola or mechanicallydamaged 373Scutareanu P., Sabelis M.W., BoonJ.J., HageE.v.d., Grove A.

Chemotaxonomy of wild Vigna species as potential source of resistanceto insects 375Cardinali A., Linsalata V., Perrino P., Lattanzio V.

Interaction between cereal phenolics and grain aphid Sitobion avenue (Fabr.) 377Bakowski T., Leszczynski B.

Accumulation of coumarin phytoalexins in sunflower plants (Helianthusannuush.) 379Gutierrez-Mellado M. C., Parry A.D., Jorrin J., Tena M., Edwards R.

Elicitation of the phytoalexin response in sunflower cell cultures 381Duran M. C., Gutierrez-Mellado M. C., Perez-Lorente R., Edwards R., Parry A.D.,Jorrin J., TenaM.

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Induction of phytoalexin root secretion by salt and osmotic stress in chickpea(Cicer arietinum L.) seedlings 383Armero J., Lopez-Valbuena R., Jorrin J., Tena M.

Stress-induced lignification in Picea abies cultures 385Lapierre C, Monties B., Lange B.M., Sandermann H.Jr.

Polyphenolic compounds of virus-infected grapevine 387Buciumeanu E., Grecu C., Bejan C.

Phenolics and postharvest diseases of fruits and vegetables 389Lattanzio V., Cardinali A., di VenereD., Linsalata V., Biondi G., Bertolini P.,Pratella G.C., Salerno M.

New antifungal polyphenols from Eriosema tuberosum (Leguminosae) 391Ma W.G., Fuzzati N., Yang C.R., Stoeckli-Evans H, Hostettmann K.

Effects of rosemary extracts on lipid oxidation 393Guerreiro M., Amaral M. T., Proenca da Cunha A.

Activity biologique de 24 flavones: Inhibition de la xanthine oxydase et capturede radicaux libres 395Cotelle N., Bernier J.-L., Catteau J.-P., GaydouE., Wallet J.-C.

Inhibitory activity of apigeninidin towards the xanthine oxidase enzyme 397Rastelli G., Costantino L., AlbasiniA.

Effect of grape seed procyanidins on some vascular diseases 399KontekA., Campeanu R., Petrescu L., Rizea S.

Antiradiation effect of polyphenols from Geranium sanguineum L 401Velev G., Ivancheva S., Bourzeix M.

Bioflavanol studies: the biological activities of grape seed polyphenolics in cellculture 403Williams R., Elliott M., Reddy J.

Positive health effects in white wine: chardonnay seed enhancement studies 405Williams R.L., Duvernay J.M., Recht J.

Antitumor-promoting activity of loblolly pine bark condensed tannin in mouseepidermis in vivo 407PerchelletJ.P., GaoX.M., Perchellet E.M., GaliH.U., RodriguezL.,Hemingway R. W.

Soluble polyphenols and non-extractable condensed tannins as dietaryconstituents : effect on fat excretion 409Bravo L., Saura-Calixto F.

Acylated flavonoids as biomarkers for UV-B radiation in Scots pine seedlings 411Jungblut T.P., SchnitzlerJ.P., Heller W., Hertkorn N., Sandermann H.Jr.

Antifungal anthraquinones from Morinda lucida Benth. (Rubiaceae) 413Rath G., Ndonzao M., Hostettmann K.Jr.

Free radical scavenger activity of bee-pollen 415Campos M.G., Cunha A.P., Navarro M.C., Utrilla M.P.

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Modification of physiological behaviour of Acanthoscelides obtectus Say(Bruchidae, Coleoptera) by some flavonoids and phenolic acids 417Regnault-Roger C., Hamraoui A.

Tannins from Cowania mexicana, and their inhibitory effects on TPA-inducedEBV activation 419ltoh H., Hatano T., MiyakeM., Yoshida T., Kozuka M., Tokuda H., Okuda T.

A polyphenol extract from Geranium sanguineum L. selectively inhibitsinfluenza virus reproduction 421Serkedjieva J., IvanchevaS.

Condensed tannins and rumen microflora - Recent developments in the study of theinteraction of condensed tannins with rumen bacteria 423McAllister T.A., Jones G.A., MuirA.D., Bae H.D., Yanke L.J., Cheng K.-J.

Rumen fungal metabolism of foliar condensed tannins isolated from the foragelegume birdsfoot trefoil (Lotus corniculatus L.) 425MuirA.D., McAllister T.A., Bae H.D, Yanke L.J., Cheng K.-J.

•art five: New analytical techniques in polyphenol investigations

"Difficult" H and * C NMR signals in structure elucidation of anthocyanins 429Pedersen A.T., Andersen O.M.

Comparison between X-ray diffraction data and calculated structures of3-hydroxy and 3-methoxyfIavones 431Cornard J. P., Vrielynck L., Merlin J. C., Wallet J. C.

Transient absorption spectroscopic studies of flavone and somemono-hydroxylated derivatives 433Vrielynck L., Coustillier G., Buntinx G., Cornard J. P., Merlin J.C.

Influence of temperature and pH on flavonoid separation by capillaryelectrophoresis 435Fernandez de Simon B., Hernandez T., Estrella I.

Optimization of pH and SDS concentration factors in MECC separation offlavonoids 437Archambault J. C., Morin P., Gaydou E., Biesse J., Andre P., Dreux M.

Capillary electrophoresis as an alternative to HPLC for the separation ofpolyphenols 439Morin P.

Gas chromatography-mass spectrometry of polymethoxylated flavones 441Berahia T., Gaydou E.M., Cerrati C, Wallet J.C.

Correlation entre les donnees spectroscopiques et des resultats de calculs dechimie quantique pour la flavone, la 3-hydroxyflavone et la 5-hydroxyflavone 443Vrielynck L., Cornard J. P., Merlin J. C.

Salts of flavones with strong acids: Are they isomers of anthocyanidins?A comparative crystallographic study 445Wallet J.-C.

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Liquid chromatography-mass spectrometry study on the stilbenes of Piceasitchensis 447Pollet B., Lapierre C., Scalbert A., Matthews S., Donnelly D.M.X.

Separation of di-C-glycosylapigenins by high-performance liquidchromatography 449Batista M. T., Amaral M. T., Proenca da Cunha A.

Optimization of high-performance liquid chromatography analyses of phenoliccompounds 451Kermasha S., Goetghebeur M., Reid A, DumontJ.

Quantitative high-performance liquid chromatography analysis of naturallyoccurring flavonoids in Citrus with photodiode array detector 453Nogata Y., Yoza K., Ohta H.

Dosage des catechines et procyanidines du raisin et du vin. Optimisation de lamethode de reaction avec la vanilline 455Sun B. S., Spranger M. 1., Leandro M. C.

A new flow injection spectrophotometric method for the determination oftannins in tea and beer by use of iron (III) and 1,10-phenanthroline 457Tomas C, Celeste M., CladeraA., Gomez E., EstelaJ.M., Cerda V.

A new methodology for the simultaneous determination of analytes andinterferents. Application to the determination of gallic acid and SO2 by use ofan automatic flow injection system 459Tomas C, Celeste M., CladeraA., Gomez E., EstelaJ.M., Cerda V.

Enhanced automatic flow injection determination of the total polyphenol indexof wines using the Folin-Ciocalteu reagent 461CelesteM., Tomas C, CladeraA., EstelaJ.M., Cerda V.

Determination of tannins in white wines by thermal lens spectrometry 463CladeraA., Tomas C, EstelaJ.M., Cerda V., Ramis-Ramos G.

Turbidimetric determination of protein-tannin interactions 465Prieur C, Cheynier V., Moutounet M.

Thermometric titration of polyhydric phenols: application to the determination ofthe tannin content of wines 467CelesteM., Tomas C, CladeraA., EstelaJ.M., Cerda V.

Extraction of ellagitannins from oak wood using a flow-through reactor 469Puech J. -L., Marinov M., Labidi A., Robert A.

Localisation histochimique des polyphe'nols 471Andary C, Mondolot-Cosson L.,Dai G.H.

Extraction and HPLC determination of phenolic compounds of low molecularweight in cider solid phase apple juice 473Mangos J.J., Suarez B., Picinelli A, Blanco D., Delage E., Drilleau J. F.

Amelioration du taux d'extraction d'anthocyanes par le precede" d'irradiation demarc de raisins 475Ayed N., Lacroix M., Latreille B., Jobin M., Cagnon M.

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Round table

Anthocyanins, oxidation and food and beverage colour 479Amiot M.J., Brouillard R., Cheynier V., Haslam E., Macheix J.J., Magnolato D.

Author index 483