Influence of water activity on Penicillium citrinum growth and kinetics of citrinin accumulation in wheat

Abstract The metastability of some phases of CsHSO4 and RbH2PO4 is due to the volume decrease at an endothermic phase transition which "locks in" the metastability in question. Water adsorption, which removes these metastabilities, probably exerts a "wedge-like" force which expands the lattice spacing in the surface layer, thus facilitating the start of the phase transition. The induction time and the zeroth order kinetics of the transition in RbH2PO4 are exponential functions of the water activity applied.

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Influence of water activity and temperature on growth and fumonisin production by Fusarium proliferatum strains on irradiated wheat grains

International Journal of Food Microbiology ◽

10.1016/j.ijfoodmicro.2017.12.001 ◽

2018 ◽

Vol 266 ◽

pp. 158-166 ◽

Cited By ~ 8

Author(s):

Eugenia Cendoya ◽

María del Pilar Monge ◽

Stella Maris Chiacchiera ◽

María Cecilia Farnochi ◽

María Laura Ramirez

Keyword(s):

Water Activity ◽

Fusarium Proliferatum ◽

Wheat Grains ◽

Influence Of Water

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Influence of Water Activity on Glyceride and Glycol Ester Synthesis by Lipase From Rhizopus arrhizus

Canadian Institute of Food Science and Technology Journal ◽

10.1016/s0315-5463(88)70814-7 ◽

1988 ◽

Vol 21 (3) ◽

pp. 255-259 ◽

Cited By ~ 10

Author(s):

F. Touraine ◽

R. Drapron

Keyword(s):

Water Activity ◽

Rhizopus Arrhizus ◽

Ester Synthesis ◽

Glycol Ester ◽

Influence Of Water

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Influence of Water Activity on Thermal Resistance of Microorganisms in Low-Moisture Foods: A Review

Comprehensive Reviews in Food Science and Food Safety ◽

10.1111/1541-4337.12190 ◽

2016 ◽

Vol 15 (2) ◽

pp. 353-370 ◽

Cited By ~ 95

Author(s):

Roopesh M. Syamaladevi ◽

Juming Tang ◽

Rossana Villa-Rojas ◽

Shyam Sablani ◽

Brady Carter ◽

...

Keyword(s):

Thermal Resistance ◽

Water Activity ◽

Influence Of Water ◽

Low Moisture Foods

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Influence of water activity and temperature on conidial germination and mycelial growth of ochratoxigenic isolates ofAspergillus ochraceus on grape juice synthetic medium. Predictive models

Journal of the Science of Food and Agriculture ◽

10.1002/jsfa.2171 ◽

2005 ◽

Vol 85 (10) ◽

pp. 1681-1686 ◽

Cited By ~ 19

Author(s):

Ester Pardo ◽

Ursino Lagunas ◽

Vincente Sanchis ◽

Antonio J Ramos ◽

Sonia Marín

Keyword(s):

Water Activity ◽

Predictive Models ◽

Mycelial Growth ◽

Synthetic Medium ◽

Grape Juice ◽

Conidial Germination ◽

Influence Of Water

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Influence of Water Activity on Protease Adsorbed on Biochar in Organic Solvents

Journal of Materials Science Research ◽

10.5539/jmsr.v6n4p96 ◽

2017 ◽

Vol 6 (4) ◽

pp. 96 ◽

Cited By ~ 2

Author(s):

Hidetaka Noritomi ◽

Jumpei Nishigami ◽

Nobuyuki Endo ◽

Satoru Kato ◽

Katsumi Uchiyama

Keyword(s):

Thermal Stability ◽

Catalytic Activity ◽

Organic Solvents ◽

Water Activity ◽

Initial Rate ◽

Butyl Ester ◽

Nitrogen Atmosphere ◽

Bamboo Charcoal ◽

Influence Of Water ◽

Hydrolysis Of

We have found that the organic solvent-resistance of Alpha-chymotrypsin (Alpha-CT) is enhanced by adsorbing Alpha-CT onto bamboo charcoal powder (BCP), which is obtained by pyrolyzing bamboo waste under nitrogen atmosphere, and is markedly dependent on the thermodynamic water activity (aw) in organic solvents. When BCP-adsorbed　Alpha-CT was immersed in acetonitrile at an appropriate water activity, it effectively enhanced the transesterification of N-acetyl-L-tyrosine ethyl ester (N-Ac-Tyr-OEt) with n-butanol (BuOH) to produce N-acetyl-L-tyrosine butyl ester (N-Ac-Tyr-OBu), compared to the hydrolysis of N-Ac-Tyr-OEt with water to give N-acetyl-L-tyrosine (N-Ac-Tyr-OH). When the water activity was 0.28, the initial rate of transesterification catalyzed by BCP-adsorbed Alpha-CT was about sixty times greater than that catalyzed by free Alpha-CT. Regarding the reaction selectivity which is defined as a ratio of the initial rate of transesterification to that of hydrolysis, BCP-adsorbed α-CT was much superior to free Alpha-CT. The catalytic activity of BCP-adsorbed Alpha-CT was markedly dependent on the reaction temperature. Furthermore, concerning the thermal stability at 50 oC, the half-life of BCP-adsorbed Alpha-CT exhibited 3.8-fold, compared to that of free Alpha-CT.

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