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J Agric Food Chem

Title:		Chemical and Sensory Evaluation of Magnetic Polymers as a Remedial Treatment for Elevated Concentrations of 3-Isobutyl-2-methoxypyrazine in Cabernet Sauvignon Grape Must and Wine
Author(s):		Liang C; Ristic R; Jiranek V; Jeffery DW;
Address:		"ARC Training Centre for Innovative Wine Production and School of Agriculture, Food and Wine , The University of Adelaide , Waite Campus, PMB 1 , Glen Osmond , South Australia 5064 , Australia"
Journal Title:		J Agric Food Chem
Year:		2018
Volume:		20180613
Issue:		27
Page Number:		7121 - 7130
DOI:		10.1021/acs.jafc.8b01397
ISSN/ISBN:		1520-5118 (Electronic) 0021-8561 (Linking)
Abstract:		"3-Isobutyl-2-methoxypyrazine (IBMP) is a potent odorant present in grapes and wines that is reminiscent of green capsicum. Suprathreshold concentrations can lead to obvious vegetative characters and suppress desirable fruity aroma nuances in wines, but options to manage IBMP concentrations are limited. This work investigated pre- and postfermentation addition of a putative imprinted magnetic polymer (PIMP) as a remedial treatment for elevated concentrations of IBMP in Cabernet Sauvignon grape must in comparison to nonimprinted magnetic polymer (NIMP) and to a commercially available polylactic acid (PLA) based film added postfermentation. Chemical and sensory analyses of wines showed that PIMP treatments were more effective than PLA film for decreasing 'fresh green' aroma nuances without negatively impacting overall aroma profiles and that postfermentation addition of a magnetic polymer removed up to 74% of the initial IBMP concentration compared to 18% for PLA. Prefermentation addition of magnetic polymers removed 20-30% less IBMP compared to that of postfermentation addition but also had less of an effect on other wine volatiles and color parameters"
Keywords:		Adult Female Fermentation Food Technology/*methods Humans Magnetics Male Molecular Imprinting Odorants/analysis Polyesters/chemistry Polymers/chemistry Pyrazines/analysis/*chemistry/isolation & purification Vitis/*chemistry Volatile Organic Compounds/*ana;
Notes:		"MedlineLiang, Chen Ristic, Renata Jiranek, Vladimir Jeffery, David W eng 2018/06/14 J Agric Food Chem. 2018 Jul 11; 66(27):7121-7130. doi: 10.1021/acs.jafc.8b01397. Epub 2018 Jun 13"