Metals in Yeast Fermentation Processes

Walker, Graeme M.

doi:10.1016/s0065-2164(04)54008-x

Cited by 106 publications

(121 citation statements)

References 44 publications

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“…Zinc is an essential micro-nutrient for yeasts (at micromolar concentrations) necessary for a considerable number of biological functions such as enzyme activity (acting as co-factor for oxidoreductases, transferases, hydrolases, lyases, isomerases, ligases and dehydrogenases enzymes), protein structure maintenance, cell surface integrity, protection of nucleic acids against free radicals and sugar uptake, among other processes (Walker, 2004). In the yeast Saccharomyces cerevisiae, zinc is estimated to be required for the function of nearly 3% of proteome (Böhm, Frishman, & Mewes, 1997).…”

Section: Introductionmentioning

confidence: 99%

Modeling the inhibitory effects of zinc chloride on table olive related yeasts

et al. 2012

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Section: Introductionmentioning

confidence: 99%

Modeling the inhibitory effects of zinc chloride on table olive related yeasts

et al. 2012

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“…Magnesium and calcium are macroelements. Magnesium constitutes 0.3% of the cell dry weight and acts as an enzyme activator (especially for all synthetases, phosphatases, and kinases) and a stress suppressor, and it helps to control cell division, growth, and size (Rees and Stewart, 1997;Briggs, 2004;Walker, 2004). It counteracts the toxic effects of Cu, Co, Cd, and Al.…”

Section: Discussionmentioning

confidence: 99%

“…Calcium affects the uptake and bioavailability of magnesium. Calcium inhibited many transphosphorylases of glycolysis that were stimulated by Mg (Walker, 2004). Industrial fermentations may be manipulated by supplementing yeast media with magnesium salts, especially MgSO 4 .…”

Section: Discussionmentioning

confidence: 99%

Screening of yeast isolates from flowers for effective ethanol production

Chaudhary

Karita

2017

Turk J Biol

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The use of alternative substrates to produce biofuel is a striking option nowadays. This study aimed to screen bioethanolproducing yeast strains. From different flowers, 65 yeasts were isolated. Twelve isolates assimilated glucose by liberation of CO 2 anaerobically. Out of these, only 5 yeast isolates fermented glucose in medium consisting of 0.8 g/L Mg 2+ ions to produce 2.05 ± 0.03% ethanol. The selected five strains were identified as members of the genera Metschnikowia or Meyerozyma based on molecular characterization. Selected yeast strains were used for conversion of rice into bioethanol following dilute acid hydrolysis and fermentation. Consistent ethanol production was 1.80 ± 0.05% at days 2-4 by Metschnikowia cibodasensis Y34 and 2.20 ± 0.21% by Meyerozyma caribica Y42 at days 4-6 with a gradual decrease at the time of experiment termination (day 10). Metschnikowia cibodasensis Y34 and Meyerozyma caribica Y42 produced the highest ethanol at pH 3, i.e. 1.75 ± 0.14% at days 3 and 5 and 2.05 ± 0.14% at days 1 and 3, respectively, upon incubation with different pH levels and 1% NaCl. Growth and ethanol production at pH 4 and 5 was close to that at pH 3, with a slight increase in production by Metschnikowia cibodasensis Y34 at pH 4 up to day 3.

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“…K12 exhibited colorless on Endo agar supplemented with Cd at higher concentration than 0.1 mg/L suggesting that Cd might be slightly toxic to yeast. It has been reported that many heavy metals are toxic to yeast cell during fermentation processes including copper, cobalt, cadmium, zinc, arsenic and lead [8]. However, the degree of toxicity depends on type, concentration and bioavailability of heavy metals.…”

Section: Cell Stabilitymentioning

confidence: 99%

Evaluation of Yeast Isolates as Indicators for Measurement of Bioavailable Cadmium

2018

ASET-18,AACBMS-18,E2HS3-18 August 6-8, 2018 Pattaya (Thailand)

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Abstract-Cadmium (Cd) in the environment significantly increased from the anthropogenic activities and its detection in the environment is essential. This study aims to characterize the phenotypic changes of 34 yeast isolates when grown with and without Cd. Seven isolates were able to grow on Endo agar (EA) with 30 µg/mL kanamycin (KAN) and Congo red agar (CRA) with 100 µg/mL vancomycin (VAN) when treated with 0-10 mg/L Cd. On EA with KAN, K12 showed a pink colony on agar without Cd but colorless on medium with Cd. Two isolates (K9 and K11) changed the color from orange to red colonies on CRA with VAN and 0-1 mg/L Cd after incubation for 48 h. The observed visible colors of yeast growth using different media indicated their certain sensitivity and specificity to bioavailable Cd. Thus, additional growth conditions will be further investigated and evaluated as the indicators of Cd in contaminated samples.

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Metals in Yeast Fermentation Processes

Cited by 106 publications

References 44 publications

Modeling the inhibitory effects of zinc chloride on table olive related yeasts

Modeling the inhibitory effects of zinc chloride on table olive related yeasts

Screening of yeast isolates from flowers for effective ethanol production

Evaluation of Yeast Isolates as Indicators for Measurement of Bioavailable Cadmium

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