In an attempt to investigate the probable roles of lactic starter
flora in the development of fruitiness and slit-openness in Cheddar
cheese, several experimental lots of cheese were made with different
commercial lyophilized starters until the defect could be consistently
duplicated. From many such trials, two cultures, B and C,...
The stability of diacetyl in fermented milk and the removal of
diacetyl from beer were studied. A convenient method for the determination
of diacetyl in beer, established by Owades and Jakovac, was
modified and applied for flavor analyses of dairy products. Through
this method, diacetyl in 12 samples could be...
A report in the literature suggesting that the use of cottage
cheese dressing cultured with S. diacetilactis would afford enhanced
flavor and shelf life in the finished product prompted this study to
examine reasons for its effectiveness. The method used involved
addition of a culture of S. diacetilactis 18-16 to...
Sporadic outbreaks of diacetyl off-flavor in beer are a serious
economic problem to the brewing industry. Studies were carried out
in an attempt to improve the understanding of the problem and to experiment
with new ways of controlling this defect.
The Owades and Jakovac method of diacetyl determination as
modified...
In an attempt to determine the natural habitat of Streptococcus
lactis, Streptococcus cremoris, and Streptococcus diacetilactis 27
different species of vegetables, 18 species of fruits and many individual
cow raw milk samples were examined.
S. lactis was found to occur on potatoes, corn, cucumbers,
peas, beans, and cantaloupe. In each...
Experiments were carried out to purify and characterize the
galactosidase of the Streptococcus lactis 7962. Purification was
accomplished using standard procedures; however the lability of
the enzyme to numerous treatments limited the techniques that could
be used and the amount of active enzyme recovered. Gel filtration
revealed that the enzyme...
The presence of diacetyl in sufficient concentrations to cause
off-flavor in beer is a serious economic problem affecting the brewing
industry. Research was carried out in an attempt to provide an
industrially acceptable method for reducing diacetyl to safe levels
in beer, with additional applications to frozen concentrated orange
juice,...
From a population of cells of Pseudomonas aeruginosa sensitive 33 parts per million (ppm) and 0.1 mg per ml of quaternary
ammonium (QAC) and chloramphenicol respectively, pure strains
resistant to 750 ppm and 50 mg per ml of these antibiotics were isolated.
Lipids from the sensitive and resistant cells grown...