Abstract:
:Malolactic fermentation (MLF) is a secondary bioconversion developed in some wines involving malic acid decarboxylation. The induction of MLF in wine by cultures of free and immobilized Oenococcus oeni cells was investigated. This work reports on the effect of surface charges in the immobilization material, a recently described fibrous sponge, as well as the pH and the composition of the media where cells are suspended. A chemical treatment provided positive charge to the sponges (DE or DEAE) and gave the highest cell loadings and subsequent resistance to removal. Preculture media to grow the malolactic bacteria before the immobilization procedure were also evaluated. We have established favorable conditions for growth (Medium of Preculture), suspension solution (Tartrate-Phosphate Buffer), suspension pH (3.5-5.5) and immobilization matrix (DE or DEAE cellulose sponge) to induce MLF in red wine. The use of a semi-continuous system permitted a high-efficiency malic acid conversion by 2 x 10(9) cfu sponge(-)(1) in at least four subsequent batch fermentations.
journal_name
Enzyme Microb Technoljournal_title
Enzyme and microbial technologyauthors
Maicas S,Pardo I,Ferrer Sdoi
10.1016/s0141-0229(00)00339-2keywords:
subject
Has Abstractpub_date
2001-03-08 00:00:00pages
415-419issue
4-5eissn
0141-0229issn
1879-0909pii
S0141022900003392journal_volume
28pub_type
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journal_title:Enzyme and microbial technology
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