Mormile, Amalia
(2011)
Studio della microflora lattica autoctona del Pecorino di Tramonti: un formaggio artigianale prodotto
nel territorio del Parco Regionale dei Monti Lattari.
[Tesi di dottorato]
(Inedito)
| Tipologia del documento: |
Tesi di dottorato
|
| Lingua: |
Italiano |
| Titolo: |
Studio della microflora lattica autoctona del Pecorino di Tramonti: un formaggio artigianale prodotto
nel territorio del Parco Regionale dei Monti Lattari |
| Autori: |
| Autore | Email |
|---|
| Mormile, Amalia | amalia.mormile@unina.it |
|
| Data: |
29 Novembre 2011 |
| Numero di pagine: |
213 |
| Istituzione: |
Università degli Studi di Napoli Federico II |
| Dipartimento: |
Scienze zootecniche e ispezione degli alimenti |
| Scuola di dottorato: |
Scienze veterinarie per la produzione e la sanità |
| Dottorato: |
Produzione e sanità degli alimenti di origine animale |
| Ciclo di dottorato: |
24 |
| Coordinatore del Corso di dottorato: |
| nome | email |
|---|
| Cortesi, Maria Luisa | [non definito] |
|
| Tutor: |
| nome | email |
|---|
| Murru, Nicoletta | [non definito] |
|
| Data: |
29 Novembre 2011 |
| Numero di pagine: |
213 |
| Parole chiave: |
KEY WORDS: raw milk cheese, Lactic acid bacteria, Bacterial identification, Ribotyping. |
| Settori scientifico-disciplinari del MIUR: |
Area 07 - Scienze agrarie e veterinarie > VET/04 - Ispezione degli alimenti di origine animale |
[error in script]
[error in script]
| Depositato il: |
06 Dic 2011 15:26 |
| Ultima modifica: |
30 Apr 2014 19:47 |
| URI: |
http://www.fedoa.unina.it/id/eprint/8625 |
| DOI: |
10.6092/UNINA/FEDOA/8625 |
Abstract
The natural lactic flora of Tramonti Pecorino, a typical cheese manufactured in the “Lattari mountain” area in the province of Salerno (Italy), was investigated. Particular attention was paid to the assessment of the growth dynamics and to the molecular identification of the indigenous lactic acid bacteria involved in the ripening of this cheese made with raw sheep milk without starter cultures. Two batches of cheese were produced for the trial: the first called Classical Tramonti Pecorino (CTP) and the second called chilli Tramonti Pecorino (CTP1). In total, 4 samples from CTP were taken, the first one on the manufacturing day and the others on the 39º, 60º and 94º ripening day. Subsequently, 4 samples from CTP1 were taken, the first one on the manufacturing day and the others on the 30º, 50º and 105° ripening day. Lactobacillus and Lactococcus were enumerated and randomly isolated on MRS and LM17 agar (32ºC x 48h ± 2h -mesophilic flora- and 42°C x 48h ± 2h -thermophilic flora) in both batches of pecorino cheese. The gram positive and catalase negative colony (n. 101 in CTP and n. 67 in CTP1) were genotipically identified by Ribotyping. In CTP the thermophilic lactic flora initial values of log10 5.2 cfu/g (Lactobacillus) and log10 7.5 cfu /g (Lactococcus) reached the average values of log10 5.5 cfu/g at the end of ripening. The mesophilic Lactobacillus and Lactococcus showed an initial charge of log10 8.3 cfu /g reaching, at the end of ripening, the values of log10 5.3 and 6.5 cfu / g. In CTP1, mesophilic Lactobacillus attested on 107 cfu/g during whole ripening time while thermophilic Lactobacillus, at the end of ripening reached 106 cfu/g from initial values of 105 cfu/g; on average, mesophilic and thermophilic Lactococcus attested on 106 cfu/g from the beginning of ripening.Ribotyping allowed us to detect 4 lactic acid bacteria species in both baches: Enterococcus faecium (69,30% in CTP; 64,17% in CTP1), Lactococcus lactis spp. cremoris (18,81% in CTP; 25,37% in CTP1), Enterococcus faecalis (8,91% in CTP; 5,97% in CTP1), Enterococcus durans (2,97 % in CTP; 4,47% in CTP1). The four species of lactic bacteria identified by Ribotyping show the diversity of indigenous lactic acid bacteria that characterizes both Tramonti Pecorino cheese examinated.
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