New information following the change in COVID-19 alert levels.

Koon Teh

Doctor of Philosophy, (Food Technology)
Study Completed: 2013
College of Health


Thesis Title
Enzymes produced by bacteria within biofilms of dairy origin and their effect on dairy products

Read article at Massey Research Online: MRO icon

Prior to Mr Teh’s study, there were some unexplained reports of dairy product spoilage. Although all quality indicators suggested that products were of the best quality following manufacture, unusual flavours were sometimes reported. Mr Teh showed that bacteria from the internal surface of milk tankers (biofilms) could produce enzymes that remain active after dairy manufacture. These biofilms were found to produce up to 10 times more enzymes than these bacteria normally produce, which was associated with the biofilm form of growth. The link between the quality of dairy products and enzymes produced by bacteria within biofilms was demonstrated. Furthermore, heat-stable enzymes produced by bacteria within biofilms in an in vitro model of a milk tanker, were shown to reduce the quality of UHT dairy products during prolonged storages. His results suggest that the transportation of milk needs to be controlled to prevent spoilage of dairy products.

Professor Steve Flint
Dr Denise Lindsay
Dr Paul Andrewes
Dr Jon Palmer
Associate Professor Phil Bremer

Contact us Mon - Fri 8:30am to 4:30pm 0800 MASSEY (+64 6 350 5701) TXT 5222 Web chat Staff Alumni News Māori @ Massey