Dear Emmanuelle, I worked with plants and metals a little in my post-doc as a collaboration. We found that ZnO-exposed wheat was binding Zn as a phosphate complex. Probably a Zn-phytate. But the coordination is close enough to the inorganic mineral hopeite for XANES fingerprinting. Data from the paper is attached here. The reference is a standard Zn foil reference. https://link.springer.com/article/10.1007/s11051-012-1125-9 From my recollection, phytate-metal complexes are fairly ubiquitous in plants, but particularly so in the cereal grains. It is probably worth finding a Zn-phytate reference, but we never had the time and money to synthesize one. Best regards, Drew Latta From: Ifeffit [mailto:ifeffit-bounces@millenia.cars.aps.anl.gov] On Behalf Of emmanuelle Montarges-Pelletier Sent: Friday, May 18, 2018 8:46 AM To: ifeffit@millenia.cars.aps.anl.gov Subject: [Ifeffit] XANES spectra of Zn-organic references Dear all We have measured Zn XANES spectra within biological samples (seeds), in ambient conditions (room temperature). In order to interprete the spectra, we are searching for Zn-organic reference spectra (XANES only). Indeed, we would be interested by Zn organic compounds with sulfur and/or nitrogen and/or oxygen in the first shell of coordination. On the joined graph are plotted the experimental spectra (microspectra on seeds), compared to Zn-citrate and Zn-cysteine. Energy calibration was checked for all spectra. thanks in advance for your answers best regards Emmanuelle Emmanuelle MONTARGES-PELLETIER Chargée de Recherche CNRS LIEC Laboratoire Interdisciplinaire des Environnements Continentaux UMR 7360 CNRS Université de Lorraine 15 avenue du Charmois F-54500 Vandœuvre-lés-Nancy - France tel 33 (0)03 72 74 47 30 mob 33(0)6 31 33 10 30 ****attention changement de numéro de téléphone **** tel 33 (0)3 72 74 47 30