Vit.En.

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FileEngine::read() - CORE/cake/libs/cache/file.php, line 184
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Configure::corePaths() - CORE/cake/libs/configure.php, line 459
Configure::buildPaths() - CORE/cake/libs/configure.php, line 580
Configure::__loadBootstrap() - CORE/cake/libs/configure.php, line 683
Configure::getInstance() - CORE/cake/libs/configure.php, line 125
include - CORE/cake/bootstrap.php, line 46
[main] - APP/webroot/index.php, line 37

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AppController::beforeFilter() - APP/app_controller.php, line 72
SiteController::beforeFilter() - APP/controllers/site_controller.php, line 11
Dispatcher::dispatch() - CORE/cake/dispatcher.php, line 228
[main] - APP/webroot/index.php, line 45

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AppController::beforeFilter() - APP/app_controller.php, line 72
SiteController::beforeFilter() - APP/controllers/site_controller.php, line 11
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AppController::beforeFilter() - APP/app_controller.php, line 72
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[main] - APP/webroot/index.php, line 45

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AppController::beforeFilter() - APP/app_controller.php, line 72
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AppController::beforeFilter() - APP/app_controller.php, line 72
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[main] - APP/webroot/index.php, line 45

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unserialize - [internal], line ??
FileEngine::read() - CORE/cake/libs/cache/file.php, line 184
Cache::read() - CORE/cake/libs/cache.php, line 253
DataSource::__cacheDescription() - CORE/cake/libs/model/datasources/datasource.php, line 399
DataSource::describe() - CORE/cake/libs/model/datasources/datasource.php, line 241
DboMysql::describe() - CORE/cake/libs/model/datasources/dbo/dbo_mysql.php, line 185
Model::schema() - CORE/cake/libs/model/model.php, line 826
Model::setSource() - CORE/cake/libs/model/model.php, line 708
Model::__construct() - CORE/cake/libs/model/model.php, line 356
ClassRegistry::init() - CORE/cake/libs/class_registry.php, line 128
Controller::loadModel() - CORE/cake/libs/controller/controller.php, line 446
SiteController::beforeFilter() - APP/controllers/site_controller.php, line 15
Dispatcher::dispatch() - CORE/cake/dispatcher.php, line 228
[main] - APP/webroot/index.php, line 45

Vit.En.

Ricerca

Agrofarmaci

Macchine Viticole

Materiali impianto

Enologia

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Alterazioni da batteri acetici

Read it in English

Acescenza

Acescenza

I batteri che nel vino possono causare acescenza appartengono ai generi Acetobacter e Gluconobacter. Entrambi di forma ellittica o a bastoncino e piccole dimensioni (0,5-0,8 x 0,9-4 micron), sono caratteristici Gram-negativi e aerobi obbligati. Essi sono in grado di metabolizzare l’etanolo o alcol etilico con produzione di acido acetico. Ciò comporta come conseguenza diretta una diminuzione del grado alcolico e un aumento dell’acidità volatile con caratteristico odore pungente e sgradevole, dato non tanto dalla percezione olfattiva diretta dell’acido acetico quanto piuttosto dall’estere etilico di quest’ultimo (acetato di etile), caratterizzato da una soglia di percezione molto bassa. Quando questo raggiunge i 200 mg/l si può parlare del così detto “spunto acetico”.

Avendo definito i batteri acetici come “aerobi obbligati”, va da se che essi possano svilupparsi in substrati con una sicura disponibilità di ossigeno, come potrebbe essere la parte superiore di una vasca scolma, soprattutto se la gradazione alcolica non è molto elevata (10-11% v/v) e il tenore in SO2 molecolare inferiore ai 0,5 mg/l. È quindi fondamentale che il tecnico si preoccupi di verificare che i contenitori siano sempre ben colmi, oppure saturati con gas inerte quali N o CO2, oltre al tenore di SO2 attiva contro i microrganismi.

Ricerca per Tag: Alterazioni da batteri acetici

Principali lieviti di importanza enologica

Enrico Vaudano Tratto da Vitenda 2016 Attingendo all'archivio della Collezione presente presso il Consiglio per la ricerca in Agricoltura e l'analisi dell'economia agraria (CREA), Centro di Ricerca per l'Enologia di Asti, ecco [...]