Fermentation of whey-derived matrices by : alcoholic beverage development from whey and fruit juice mixes.

This research paper addresses the hypotheses that can be cultured with good alcohol production on different whey-derived matrices, and that the fermented product can be used in order to develop alcoholic beverages with acceptable sensory characteristics by mixtures with yeast-fermented fruit-based matrices. Growth and fermentative characteristics of LFIQK1 in different whey-derived matrices were explored by culturing (24 h, 30°C) on reconstituted whey, demineralized whey, heat-treated whey and milk permeate media. High lactose consumption, ethanol production and yield were observed.

Similarities of Geobacillus bacteria based on their profiles of antimicrobial susceptibility in milk samples.

The genus Geobacillus is composed of thermophilic bacteria that exhibit diverse biotechnological potentialities. Specifically, Geobacillus stearothermophilus is included as a test bacterium in commercial microbiological inhibition methods, although it exhibits limited sensitivity to aminoglycosides, macrolides, and quinolones. Therefore, this article evaluates the antibiotic susceptibility profiles of five test bacteria (G.

Transfer of antibiotics from goat's milk to rennet curd and whey fractions during cheese-making.

The transfer of 35 antibiotics from milk to curd and whey was evaluated. Cheeses were produced at laboratory scale, from antibiotic-free goat's milk spiked with different antibiotic concentrations between 0.25 and 4 times the Maximum Residue Limits established in milk.

Five-assay microbiological system for the screening of antibiotic residues.

A novel microbiological system in microtiter plates consisting of five bioassays is presented for the detection and classification of antibiotic residues in milk. The bioassays were optimized for the detection of beta-lactams (Bioassay B: Geobacillus stearothermophilus), macrolides (Bioassay M: Bacillus megaterium with fusidic acid), tetracyclines (Bioassay T: B. megaterium with chloramphenicol), quinolones (Bioassay Q: Bacillus licheniformis) and sulfamides (Bioassay QS: B.

Novel bioassay using Bacillus megaterium to detect tetracycline in milk.

Tetracyclines are used for the prevention and control of dairy cattle diseases. Residues of these drugs can be excreted into milk. Thus, the aim of this study was to develop a microbiological method using Bacillus megaterium to detect tetracyclines (chlortetracycline, oxytetracycline and tetracycline) in milk.

Microbiological bioassay using Bacillus pumilus to detect tetracycline in milk.

The tetracyclines (TCs) are widely used in the treatment of several diseases of cattle and their residues may be present in milk. To control these residues it is necessary to have available inexpensive screening methods, user-friendly and capable of analysing a high number of samples. The purpose of this study was to design a bioassay of microbiological inhibition in microtiter plates with spores of Bacillus pumilus to detect TCs at concentrations corresponding to the Maximum Residue Limits (MRLs).

Detection of antibiotics in goat's milk: effect of detergents on the response of microbial inhibitor tests.

The aim of the study was to evaluate the interference of acid and alkaline detergents employed in the cleaning of milking equipment of caprine dairy farms on the performance of microbial tests used in antibiotic control (BRT MRL, Delvotest MCS, and Eclipse 100). Eight concentrations of commercial detergents, five acid (0-0.25%) and five alkaline (0-1%) were add to antimicrobial-free goat's milk to evaluate the detergent effect on the response of microbial inhibitor tests.

Effect of storage and preservation of milk samples on the response of microbial inhibitor tests.

The aim of this study was to evaluate the effect of storage time (4 °C) on milk samples and the use of azidiol as preservative on the results of microbial inhibitor tests used to detect antimicrobials in milk. For this purpose, 16 milk bulk samples divided into two aliquots, preservative-free and with azidiol, spiked with 12 concentrations of amoxicillin, ampicillin, penicillin G and oxytetracycline, were used. The milk samples were analysed using the BRT MRL, Delvotest MCS Accelerator and Eclipse 100 at 0, 24, 48 and 72 h stored at 4 °C.

Influence of environmental factors on airborne fungi in houses of Santa Fe City, Argentina.

This study investigated concentration and types of airborne fungi spores of indoor air. Forty nine houses of Santa Fe city (Argentina) were examined during one year. This city is characterized by a warm climate with an annual mean temperature of 18.