Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/112948
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Type: Journal article
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: Liang, C.
Ristic, R.
Jiranek, V.
Jeffery, D.
Citation: Journal of Agricultural and Food Chemistry, 2018; 66(27):7121-7130
Publisher: American Chemical Society
Issue Date: 2018
ISSN: 0021-8561
1520-5118
Statement of
Responsibility: 
Chen Liang, Renata Ristic, Vladimir Jiranek, and David W. Jeffery
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: polymer synthesis; sorption properties; character impact compound; aroma matrix; wine; GC-MS
Rights: © 2018 American Chemical Society
RMID: 0030090630
DOI: 10.1021/acs.jafc.8b01397
Grant ID: http://purl.org/au-research/grants/arc/IC130100005
Appears in Collections:Agriculture, Food and Wine publications

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