This paper analyses in a full-scale industrial process Wrstly the nitrogen compounds in all-malt and in maize-adjunct worts, then their fate during the main brewing steps and Wnally the inXuence on them of two different separation technologies: mash Wlter (Meura 2001) and lauter tun (Steinecker FVAS 26). Data showed that (1) maize-adjunct worts have a lower total nitrogen compounds than all-malt worts; (2) assimilable nitrogen represents 20–24% out of the total nitrogen in both all-malt and in adjunct worts; (3) free amino nitrogen nearly doubles in all-malt compared with adjunct worts; (4) proline and asparagine are the most abundant amino acids in both worts; (5) ammonium disappears during fermentation in wort with the lowest nitrogen content, i.e. in maize-adjunct wort. Moreover, the total nitrogen is reduced in all-malt by 80% with the Steinecker FVAS 26 lauter tun and 25% with the Meura 2001 Wlter, while in adjunct worts by 87% with the Steinecker FVAS 26 lauter tun and 29% with the Meura 2001 filter. After mash Wltration, the content of assimilable nitrogen remains to be adequate for an eYcient fermentation, but after lauter tun separation, the assimilable nitrogen reaches values that may compromise the regular fermentation process in both all-malt and adjunct worts. Therefore,when using lauter tun, we have to intervene to reduce its impact on nitrogen compounds and/or plan the wort nitrogen supplementation to overcome the stuck and sluggish fermentations.

Fumi, M. D., Galli, R., Lambri, M., Donadini, G., De Faveri, D. M., Impact of full-scale brewing processes on lager beer nitrogen compounds, <<EUROPEAN FOOD RESEARCH AND TECHNOLOGY>>, 2009; 230 (2): 209-216 [http://hdl.handle.net/10807/9111]

Impact of full-scale brewing processes on lager beer nitrogen compounds

Fumi, Maria Daria;Galli, Roberta;Lambri, Milena;Donadini, Gianluca;De Faveri, Dante Marco
2009

Abstract

This paper analyses in a full-scale industrial process Wrstly the nitrogen compounds in all-malt and in maize-adjunct worts, then their fate during the main brewing steps and Wnally the inXuence on them of two different separation technologies: mash Wlter (Meura 2001) and lauter tun (Steinecker FVAS 26). Data showed that (1) maize-adjunct worts have a lower total nitrogen compounds than all-malt worts; (2) assimilable nitrogen represents 20–24% out of the total nitrogen in both all-malt and in adjunct worts; (3) free amino nitrogen nearly doubles in all-malt compared with adjunct worts; (4) proline and asparagine are the most abundant amino acids in both worts; (5) ammonium disappears during fermentation in wort with the lowest nitrogen content, i.e. in maize-adjunct wort. Moreover, the total nitrogen is reduced in all-malt by 80% with the Steinecker FVAS 26 lauter tun and 25% with the Meura 2001 Wlter, while in adjunct worts by 87% with the Steinecker FVAS 26 lauter tun and 29% with the Meura 2001 filter. After mash Wltration, the content of assimilable nitrogen remains to be adequate for an eYcient fermentation, but after lauter tun separation, the assimilable nitrogen reaches values that may compromise the regular fermentation process in both all-malt and adjunct worts. Therefore,when using lauter tun, we have to intervene to reduce its impact on nitrogen compounds and/or plan the wort nitrogen supplementation to overcome the stuck and sluggish fermentations.
Inglese
Fumi, M. D., Galli, R., Lambri, M., Donadini, G., De Faveri, D. M., Impact of full-scale brewing processes on lager beer nitrogen compounds, <<EUROPEAN FOOD RESEARCH AND TECHNOLOGY>>, 2009; 230 (2): 209-216 [http://hdl.handle.net/10807/9111]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10807/9111
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 15
  • ???jsp.display-item.citation.isi??? 15
social impact