Validation of in-vitro antifungal activity of the fermentation quotient on bread spoilage moulds through growth/no-growth modelling and bread baking trials

Publication date: January 2020Source: LWT, Volume 117Author(s): Els Debonne, Peter Maene, An Vermeulen, Filip Van Bockstaele, Laura Depredomme, Pieter Vermeir, Mia Eeckhout, Frank DevlieghereAbstractThe main objectives were to investigate the antifungal effect of lactic (LA) and acetic acid (AA) and the fermentation quotient (FQ, mol/L ratio of LA over AA) towards Penicillium paneum and Aspergillus niger through growth/no-growth modelling of in-vitro data and to validate its effect in chemically acidified bread by performing challenge tests. Results have shown that AA has strong antifungal activity towards both bread moulds, albeit that P. paneum is ten times more resistant compared to A. niger. Complete growth inhibition of A. niger on chemically acidified bread was observed during 35 days at 21 °C for concentrations of AA ≥ 33 mmol/kg dough or ≥165 mmol undissociated AA/L water phase in bread. Whereas for A. niger the FQ must be close to zero and the concentration of AA in bread 33 mmol/kg dough to achieve complete growth inhibition, very high concentrations of AA and LA were needed to prevent growth of P. paneum (>100 mmol/kg dough). The acids also affected yeast activity in dough resulting in lower specific volumes and harder bread crumb. To conclude, the antifungal activity of the FQ cannot be generalized because its antifungal power depends on the sensitivity of the mould species towards LA and AA.
Source: LWT Food Science and Technology - Category: Food Science Source Type: research

Related Links:

Publication date: Available online 16 October 2019Source: Process BiochemistryAuthor(s): Romero M.P. Brandão-Costa, Thiago Pajeu Nascimento, Raquel Pedrosa Bezerra, Ana L.F. PortoAbstractFilicium decipiens saponin (FDS) is the first saponin purified from F. decipiens seeds using ion-exchange and gel filtration chromatographies. In the present study, FDS and the aqueous crude extract of F. decipiens seeds were examined for their antifungal properties, hemolytic / cytotoxicity activity. The dried seeds were powdered and homogenized in 10% (w/v) for the preparation of crude extract. Sample obtained from Sephadex-LH-20 ...
Source: Process Biochemistry - Category: Biochemistry Source Type: research
Updated Date: Thu, 17 Oct 2019 00:00:00 EDT
Source: DailyMed Drug Label Updates - Category: Drugs & Pharmacology Source Type: alerts
Publication date: Available online 15 October 2019Source: Journal of Bioscience and BioengineeringAuthor(s): Adinda P. Wisman, Yoshihiro Tamada, Shuji Hirohata, Katsuya Gomi, Eiichiro Fukusaki, Shuichi ShimmaIn sake brewing, the quality of rice koji is evaluated by experienced sake brewers based on visual inspection of the haze, which is defined by the extent of fungal hyphae spread on/into the rice grains. There is an increasing interest in understanding the factors that affect the quality of rice koji, which is dependent on its making process. Several studies have focused on the degree of mycelial penetration (haze-komi)...
Source: Journal of Bioscience and Bioengineering - Category: Biomedical Science Source Type: research
Abstract A new diketopiperazine cyclo-(L-Phe-N-ethyl-L-Glu) (1), along with two known diketopiperazines cyclo-(L-Pro-L-Leu) (2) and cyclo-(L-Pro-L-Phe) (3) were isolated from the cultures of an endophytic fungus Aspergillus aculeatus F027. The structures of these compounds were elucidated based on spectroscopic data. The configurations of these compounds were determined by advanced Marfey's analysis. Antibacterial activity of the diketopiperazines against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa were also evaluated. PMID: 31617784 [PubMed - as supplied by publisher]
Source: Natural Product Research - Category: Biochemistry Authors: Tags: Nat Prod Res Source Type: research
Updated Date: Tue, 15 Oct 2019 00:00:00 EDT
Source: DailyMed Drug Label Updates - Category: Drugs & Pharmacology Source Type: alerts
Abstract This paper aims to quantify airborne fungal load in air-conditioned rooms and develop a health risk rating scale for different indoor environments. Five sampling locations in Kolkata frequented by a heterogeneous human population, containing various types of fungal growth-promoting substances (FGPS) like old documents, food items, waste hair, etc. were chosen as sampling locations where an Andersen Two-Stage Cascade Impactor was ran using Rose Bengal agar and Potato Dextrose agar media plates. Total spore load (CFU/m3), species diversity, species dominance, human exposure time, susceptible age and FGPS we...
Source: Archives of Environmental and Occupational Health - Category: Environmental Health Authors: Tags: Arch Environ Occup Health Source Type: research
cute;lafi-Bakó K Abstract The effects of the bioreactor conditions, in particular the mode and intensity of aeration and mixing were studied on itaconic acid (IA) fermentation efficiency by Aspergillus terreus strain from glucose substrate. IA was produced in batch system by systematically varying the oxygen content of the aeration gas (from 21 to 31.5 vol% O2) and the stirring rate (from 150 to 600 rpm). The data were analyzed kinetically to characterize the behavior of the process, and besides, the performances were evaluated comparatively with the literature. It turned out that the operation of...
Source: Biotechnology Letters - Category: Biotechnology Authors: Tags: Biotechnol Lett Source Type: research
Abstract Imbalance of osteoblast and osteoclast in adult leads to a variety of bone-related diseases, including osteoporosis. Thus, suppressing the activity of osteoclastic bone resorption becomes the main therapeutic strategy for osteoporosis. Asperpyrone A is a natural compound isolated from Aspergillus niger with various biological activities of antitumour, antimicrobial and antioxidant. The present study was designed to investigate the effects of Asperpyrone A on osteoclastogenesis and to explore its underlining mechanism. We found that Asperpyrone A inhibited RANKL-induced osteoclastogenesis in a dose-depende...
Source: J Cell Mol Med - Category: Molecular Biology Authors: Tags: J Cell Mol Med Source Type: research
Aflatoxins (AFs) as potent food contaminants are highly detrimental to human and animal health. The production of such biological toxins is influenced by environmental factors including pollutants, such as dioxins. Here, we report the biological feedback of an active AF-producer strain of A. flavus upon in vitro exposure to the most toxic congener of dioxins, the 2,3,7,8-tetrachlorinated dibenzo-p-dioxin (TCDD). The phenotype of TCDD-exposed A. flavus was typified by a severe limitation in vegetative growth, activation of conidia formation and a significant boost in AF production. Furthermore, the level of reactive oxygen ...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
Source: The Aspergillus Website - updates - Category: Respiratory Medicine Authors: Source Type: news
More News: Acetic Acid | Aspergillus | Chemistry | Food Science | Niger Health | Science