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Bioconversion of ovine scotta into lactic acid with pure and mixed cultures of lactic acid bacteria

Secchi, Nicola and Giunta, Daniela and Pretti, Luca and Ruiz García, Mónica and Roggio, Tonina and Mannazzu, Ilaria Maria and Catzeddu, Pasquale (2012) Bioconversion of ovine scotta into lactic acid with pure and mixed cultures of lactic acid bacteria. Journal of Industrial Microbiology & Biotechnology, Vol. 39 (1), p. 175-181. ISSN 1367-5435. eISSN 1476-5535. Article.

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DOI: 10.1007/s10295-011-1013-9

Abstract

Scotta is the main by-product in the making of ricotta cheese. It is widely produced in southern Europe and particularly in Italy where it represents a serious environmental pollutant due to its high lactose content. With the aim of evaluating whether scotta bioconversion into lactic acid can be considered as an alternative to its disposal, besides providing it with an added value, here the growth, fermentative performances, and lactic acid productions of pure and mixed cultures of Lactobacillus casei, Lactobacillus helveticus, and Streptococcus thermophilus were evaluated on ovine scotta-based media, without and with the addition of nutritional supplements. The outcomes indicate that ovine scotta can be utilized for the biotechnological production of lactic acid with yields up to 92%, comparable to those obtained on cheese-whey. Indeed, the addition of nutritional supplements generally improves the fermentative performances of lactic acid bacteria leading to about 2 g l-1 h-1 of lactic acid. Moreover, the use of mixed cultures for scotta bioconversion reduces the need for nutritional supplements, with no detrimental effects on the productive parameters compared to pure cultures. Finally, by using L. casei and S. thermophilus in pure and mixed cultures, up to 99% optically pure L-lactic acid can be obtained.

Item Type:Article
ID Code:6315
Status:Published
Refereed:Yes
Uncontrolled Keywords:Scotta, whey, lactic acid bacteria, lactose bioconversion, lactic acid
Subjects:Area 06 - Scienze mediche > MED/07 Microbiologia e microbiologia clinica
Area 07 - Scienze agrarie e veterinarie > AGR/16 Microbiologia agraria
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > Porto Conte Ricerche, Alghero
001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Springer
ISSN:1367-5435
eISSN:1476-5535
Copyright Holders:© Society for Industrial Microbiology 2011
Deposited On:26 Jul 2011 15:18

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