文献类型：期刊文献

英文题名：Polyphenol-Aluminum Complex Formation: Implications for Aluminum Tolerance in Plants

作者：Zhang, Liangliang[1] Liu, Ruiqiang[2,5] Gung, Benjamin W.[2] Tindall, Steven[2] Gonzalez, Javier M.[3] Halvorson, Jonathan J.[4] Hagerman, Ann E.[2]

第一作者：张亮亮

通信作者：Hagerman, AE[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Jiangsu, Peoples R China;[2]Miami Univ, Dept Chem & Biochem, Oxford, OH 45056 USA;[3]Purdue Univ, USDA ARS, Natl Soil Eros Res Lab, W Lafayette, IN 47907 USA;[4]USDA ARS, No Great Plains Res Lab, POB 459, Mandan, ND 58554 USA;[5]Ohio State Univ, Sch Environm & Nat Resources, Columbus, OH 43210 USA

年份：2016

卷号：64

期号：15

起止页码：3025-3033

外文期刊名：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

收录：;EI(收录号：20162002389762);Scopus(收录号：2-s2.0-84966262768);WOS:【SCI-EXPANDED(收录号:WOS:000374812700004)】；

基金：This work was partially funded by National Natural Science Foundation of China (No. 31500485) and by USDA Specific Cooperative Agreement 58-1932-6-634 to Miami University.

语种：英文

外文关键词：polyphenols; pentagalloyl glucose; oenothein B; methyl gallate; aluminum detoxification; Gaussian

摘要：Natural polyphenols may play an important role in aluminum detoxification in some plants. We examined the interaction between Al3+ and the purified high molecular weight polyphenols pentagalloyl glucose (940 Da) and oenothein B (1568 Da), and the related compound methyl gallate (184 Da) at pH 4 and 6. We used spectrophotometric titration and chemometric modeling to determine stability constants and stoichiometries for the aluminum phenol (AIL) complexes. The structures and spectral features of aluminum methyl gallate complexes were evaluated with quantum chemical calculations. The high molecular weight polyphenols formed Al3L2 complexes with conditional stability constants (beta) similar to 1 x 10(23) at pH 6 and AlL complexes with beta similar to 1 x 10(5) at pH 4. Methyl gallate formed AIL complexes with beta = 1 x 10(6) at pH 6 but did not complex aluminum at pH 4. At intermediate metal-to-polyphenol ratios, high molecular weight polyphenols formed insoluble Al complexes but methyl gallate complexes were soluble. The high molecular weight polyphenols have high affinities and solubility features that are favorable for a role in aluminum detoxification in the environment.