scholarly journals MODELLING OF LACTIC ACID PRODUCTION BY STREPTOCOCCUS CREMORIS HP

1977 ◽  
Vol 23 (1) ◽  
pp. 7-21 ◽  
Author(s):  
S. ABORHEY ◽  
D. WILLIAMSON
Keyword(s):  
Lactic Acid ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Streptococcus Cremoris

Lactic Acid Production in Milk Containing Cleaning or Sanitizing Compounds

1984 ◽  
Vol 47 (3) ◽  
pp. 197-199 ◽  
Author(s):  
MICHAEL B. LIEWEN ◽  
ELMER H. MARTH
Keyword(s):  
Lactic Acid ◽  
Ammonium Chloride ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Streptococcus Thermophilus ◽  
Lactobacillus Bulgaricus ◽  
Titratable Acid ◽  
Streptococcus Lactis ◽  
Streptococcus Cremoris ◽  
Dry Milk

Sterile reconstituted nonfat dry milk containing 0.1% (v/v) each of 19 cleaning or sanitizing compounds intended for use on dairy farms or in milk factories was inoculated with Streptococcus lactis 4175, Streptococcus cremoris C-13, Streptococcus thermophilus ST4 or Lactobacillus bulgaricus. Milk then was incubated at 32°C for 12 h and pH and titratable acid were determined. Five products (alkaline inflation cleaner, hypochlorite sanitizer-farm use, isopropanol udder wash, ammonium chloride detergent-factory use, alkaline cleaner A-factory use) were inhibitory to at least three of the four lactic acid bacteria at the 0.1% concentration. These were then tested at 0.050, 0.025, 0.012 and 0.006% concentrations. Of the five products, only the isopropanol udder wash (at all four concentrations) inhibited S. lactis and S. cremoris. The isopropanol udder wash at all four concentrations and the ammonium chloride cleaner at 0.050% inhibited L. bulgaricus. S. thermophilus was inhibited by the isopropanol udder wash at 0.050%, whereas the alkaline cleaner A-factory use, at 0.050 and 0.025%, may have been mildly stimulatory to acid production by this bacterium.

Lactic Acid Production by Streptococcus lactis and Streptococcus cremoris in Milk Precultured with Psychrotrophic Bacteria

1977 ◽  
Vol 40 (6) ◽  
pp. 406-410 ◽  
Author(s):  
M. A. COUSIN ◽  
E. H. MARTH
Keyword(s):  
Lactic Acid ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Raw Milk ◽  
Psychrotrophic Bacteria ◽  
Titratable Acid ◽  
Streptococcus Lactis ◽  
Streptococcus Cremoris ◽  
Control Milk ◽  
Cell Free Filtrate

Psychrotrophic organisms isolated from raw milk were inoculated into fresh raw milk and incubated at 7 C for 5 days. Half of each sample was autoclaved, the other half, pasteurized. Streptococcus lactis and Streptococcus cremoris were individually inoculated into the milks and incubated at 21 C for 20 h. Acid production was measured at 2-h intervals. Lactic acid production was greater in milks precultured with added psychrotrophs or the normal flora than in pasteurized control milks. In most instances, pasteurized precultured milks had more acid than did autoclaved precultured milk. More titratable acid was produced in autoclaved rather than pasteurized control milks. Milks with the psychrotroph and lactic streptococci added simultaneously had more titratable acid than did control milk. When cell-free filtrates of psychrotrophic cultures were used instead of cells of psychrotrophs, results resembled those obtained with the bacteria. Simultaneous inoculation of milk with lactic acid bacteria and cell-free filtrate gave results comparable to those from milks precultured for 5 days with the cell-free filtrate.

scholarly journals Protective effect of titanium tetrafluoride and silver diamine fluoride on radiation-induced dentin caries in vitro

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Beatriz Martines de Souza ◽  
Mayara Souza Silva ◽  
Aline Silva Braga ◽  
Patrícia Sanches Kerges Bueno ◽  
Paulo Sergio da Silva Santos ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Protective Effect ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Negative Control ◽  
Titanium Tetrafluoride ◽  
Silver Diamine Fluoride ◽  
Dentin Caries ◽  
Radiation Induced

AbstractThis in vitro study evaluated the protective effect of titanium tetrafluoride (TiF4) varnish and silver diamine fluoride (SDF) solution on the radiation-induced dentin caries. Bovine root dentin samples were irradiated (70 Gy) and treated as follows: (6 h): 4% TiF4 varnish; 5.42% NaF varnish; 30% SDF solution; placebo varnish; or untreated (negative control). Microcosm biofilm was produced from human dental biofilm (from patients with head-neck cancer) mixed with McBain saliva for the first 8 h. After 16 h and from day 2 to day 5, McBain saliva (0.2% sucrose) was replaced daily (37 °C, 5% CO2) (biological triplicate). Demineralization was quantified by transverse microradiography (TMR), while biofilm was analyzed by using viability, colony-forming units (CFU) counting and lactic acid production assays. The data were statistically analyzed by ANOVA (p < 0.05). TiF4 and SDF were able to reduce mineral loss compared to placebo and the negative control. TiF4 and SDF significantly reduced the biofilm viability compared to negative control. TiF4 significantly reduced the CFU count of total microorganism, while only SDF affected total streptococci and mutans streptococci counts. The varnishes induced a reduction in lactic acid production compared to the negative control. TiF4 and SDF may be good alternatives to control the development of radiation-induced dentin caries.

scholarly journals Lactic acid production ability of Lactobacillus sp. from four tropical fruits using their by-products as carbon source

Heliyon ◽  
2021 ◽  
Vol 7 (5) ◽  
pp. e07079
Author(s):  
Joel Romial Ngouénam ◽  
Chancel Hector Momo Kenfack ◽  
Edith Marius Foko Kouam ◽  
Pierre Marie Kaktcham ◽  
Rukesh Maharjan ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Carbon Source ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Tropical Fruits ◽  
By Products

γ-Valerolactone-Introduced Controlled-Isomerization of Glucose for Lactic Acid Production over Sn-Beta Catalyst

2021 ◽  
Author(s):  
Xinpeng Zhao ◽  
Zhimin Zhou ◽  
hu luo ◽  
Yanfei Zhang ◽  
Wang Liu ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Lactic Acid ◽  
Dft Calculations ◽  
Acid Production ◽  
Density Functional ◽  
Lactic Acid Production ◽  
Hydrothermal Conversion ◽  
Functional Theory ◽  
Environment Friendly

Combined experiments and density functional theory (DFT) calculations provided insights into the role of the environment-friendly γ-valerolactone (GVL) as a solvent in the hydrothermal conversion of glucose into lactic acid...

Impact of storage duration and micro-aerobic conditions on lactic acid production from food waste

2021 ◽  
Vol 323 ◽  
pp. 124618
Author(s):  
Zengshuai Zhang ◽  
Panagiotis Tsapekos ◽  
Merlin Alvarado-Morales ◽  
Irini Angelidaki
Keyword(s):  
Lactic Acid ◽  
Food Waste ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Storage Duration ◽  
Aerobic Conditions

Sustainable and green pretreatment strategy of Eucheuma denticulatum residues for third-generation L-lactic acid production

2021 ◽  
pp. 124930
Author(s):  
Choi Yan Chai ◽  
Inn Shi Tan ◽  
Henry Chee Yew Foo ◽  
Man Kee La ◽  
Kevin Tian Xiang Tong ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Third Generation ◽  
Eucheuma Denticulatum
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