Skip to main content Accessibility help
×
Home
Hostname: page-component-65dc7cd545-jbgjn Total loading time: 0.181 Render date: 2021-07-23T15:37:24.861Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": true, "newCiteModal": false, "newCitedByModal": true, "newEcommerce": true, "newUsageEvents": true }

Proteolysis detection in milk: III. Relationships between bacterial populations, tyrosine value and organoleptic quality during extended cold storage of milk and cream

Published online by Cambridge University Press:  01 June 2009

H. S. Juffs
Affiliation:
Otto Madsen Dairy Research Laboratory, Hamilton 4007, Brisbane, Australia

Summary

Raw bulk milk samples were stored at 5°C in the laboratory mostly for 7 or 8d and examined at intervals for bacterial content, proteolysis as indicated by tyrosine value, and organoleptic quality. Data are presented for these samples illustrating relationships between bacterial population counts, tyrosine values and organoleptic quality ratings. Bacterial counts (total bacteria, psychrotrophs and proteolytic psychrotrophs) generally exceeded 106/ml before a definite increase in tyrosine value or any deterioration in organoleptic quality could be detected. Tyrosine value was indicated to be useful as a general index of bacteriological and organoleptic quality of commercial raw milk subjected to prolonged cold storage. The tyrosine value procedure was also shown to have application for monitoring the development of proteolysis in cold-stored pasteurized milk and cream.

Type
Research Article
Copyright
Copyright © Proprietors of Journal of Dairy Research 1975

Access options

Get access to the full version of this content by using one of the access options below.

References

Franklin, J. G. (1968). Dairy Industries 33, 399.Google Scholar
Juffs, H. S. (1973 a). Journal of Dairy Research 40, 371.CrossRefGoogle Scholar
Juffs, H. S. (1973 b). Journal of Dairy Research 40, 383.CrossRefGoogle Scholar
Lightbody, L. G. (1962). Queensland Journal of Agricultural Science 19, 249.Google Scholar
Lightbody, L. G. (1965). Australian Journal of Dairy Technology 20, 24.Google Scholar
Lightbody, L. G. (1966). Queensland Journal of Agricultural and Animal Sciences 23, 57.Google Scholar
Macaulay, D. M., Hawirko, R. Z. & James, N. (1963). Applied Microbiology 11, 90.Google Scholar
9
Cited by

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Proteolysis detection in milk: III. Relationships between bacterial populations, tyrosine value and organoleptic quality during extended cold storage of milk and cream
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

Proteolysis detection in milk: III. Relationships between bacterial populations, tyrosine value and organoleptic quality during extended cold storage of milk and cream
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

Proteolysis detection in milk: III. Relationships between bacterial populations, tyrosine value and organoleptic quality during extended cold storage of milk and cream
Available formats
×
×

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *