| dbo:abstract |
A hydrolyzable tannin or pyrogallol-type tannin is a type of tannin that, on heating with hydrochloric or sulfuric acids, yields gallic or ellagic acids. At the center of a hydrolyzable tannin molecule, there is a carbohydrate (usually D-glucose but also cyclitols like quinic or shikimic acids). The hydroxyl groups of the carbohydrate are partially or totally esterified with phenolic groups such as gallic acid in gallotannins or ellagic acid in ellagitannins. Hydrolysable tannins are mixtures of polygalloyl glucoses and/or poly-galloyl quinic acid derivatives containing in between 3 up to 12 gallic acid residues per molecule. Hydrolyzable tannins are hydrolyzed by weak acids or weak bases to produce carbohydrate and phenolic acids. Examples of gallotannins are the gallic acid esters of glucose in tannic acid (C76H52O46), found in the leaves and bark of many plant species. Hydrolysable tannins can be extracted from different vegetable plants, such as chestnut wood (Castanea sativa), oak wood (Quercus robur, Quercus petraea and Quercus alba), tara pods (Caesalpinia spinosa), gallnuts (Quercus infectoria and Rhus semialata), myrobalan (Terminalia chebula), sumac (Rhus coriaria) and Aleppo gallnuts (Andricus kollari). (en) Les tanins hydrolysables sont un type de tanins caractérisés par leur faculté d'être hydrolysés. On en distingue deux sous-types: * les gallotanins (exemple: pentagalloyl glucose) * les ellagitanins (exemple: punicalagines) (fr) |
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dbr:Carbohydrate dbr:Castanea_sativa dbr:Punicacortein_C dbr:Punicalagin dbr:Punicalin dbr:Pyridine dbr:Pyrogallol dbr:Quinic_acid dbr:Molecule dbr:Andricus_kollari dbr:Human_immunodeficiency_virus dbr:Hydrochloric_acid dbr:Rhodanine dbr:Rhus_coriaria dbr:Cyclitol dbr:Quercus_alba dbr:Chestnut dbr:Ellagitannin dbr:Ester dbr:Terminalia_chebula dbr:Quercus_infectoria dbr:Quercus_petraea dbr:Ellagic_acid dbr:Gallic_acid dbr:Glucose dbr:Tannin dbr:Gall dbr:Gallotannin dbr:Bark_(botany) dbr:Reverse_transcriptase dbc:Hydrolysable_tannins dbr:Helicobacter_pylori dbr:Tannic_acid dbr:Leaf dbr:Sulfuric_acid dbr:Sumac dbr:Plant dbr:Plants dbr:D-glucose dbr:Oak dbr:Shikimic_acid dbr:Caesalpinia_spinosa dbr:Lymphocyte dbr:Quercus_robur dbr:Phenolic_acid dbr:Rhus_semialata dbr:Esterified dbr:1,3,4-Tri-O-galloylquinic_acid dbr:3,4,5-tri-O-galloylshikimic_acid dbr:3,5-di-O-galloyl-shikimic_acid |
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dbt:Reflist dbt:Short_description dbt:Tannin dbt:Guidebook dbt:Hydrolysable_tannin |
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dbc:Hydrolysable_tannins |
| gold:hypernym |
dbr:Tannin |
| rdf:type |
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| rdfs:comment |
Les tanins hydrolysables sont un type de tanins caractérisés par leur faculté d'être hydrolysés. On en distingue deux sous-types: * les gallotanins (exemple: pentagalloyl glucose) * les ellagitanins (exemple: punicalagines) (fr) A hydrolyzable tannin or pyrogallol-type tannin is a type of tannin that, on heating with hydrochloric or sulfuric acids, yields gallic or ellagic acids. At the center of a hydrolyzable tannin molecule, there is a carbohydrate (usually D-glucose but also cyclitols like quinic or shikimic acids). The hydroxyl groups of the carbohydrate are partially or totally esterified with phenolic groups such as gallic acid in gallotannins or ellagic acid in ellagitannins. Hydrolysable tannins are mixtures of polygalloyl glucoses and/or poly-galloyl quinic acid derivatives containing in between 3 up to 12 gallic acid residues per molecule. (en) |
| rdfs:label |
Tanin hydrolysable (fr) Hydrolysable tannin (en) |
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freebase:Hydrolysable tannin yago-res:Hydrolysable tannin wikidata:Hydrolysable tannin dbpedia-fr:Hydrolysable tannin https://global.dbpedia.org/id/4naWy |
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