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Acta Alimentaria
Authors: M. Nogala-Kałucka, K. Dwiecki, A. Siger, P. Górnaś, K. Polewski, and S. Ciosek

Becker, E.M., Ntouma, G. & Skibsted, L.H. (2007): Synergism and antagonism between quercetin and other chainbreaking antioxidants in lipid systems of increasing structural organisation. Fd Chem. , 103 , 1288

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. , Xiong , H. , Helmann , J. D. and Cai , Y. ( 2018 ): Antagonism of two plant-growth promoting Bacillus velezensis isolates against Ralstonia solanacearum and Fusarium oxysporum . Scient. Rep. 8 , 4360 . Duffy , B. , Schouten , A. and

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Abstract  

Extraction studies of uranium(VI) by the binary mixture of PC88A and benzimidazole show an antagonistic behavior in the concentration range 10−5–10−6M of PC88A and 0.005M of benzimidazole. Antagonism is observed due to the deprotonation of PC88A by benzimidazole forming an adduct resulting in the virtual removal of PC88A from the system.

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Fusarium wilt of tomato is one of the most prevalent and economically important diseases of tomato worldwide especially in tropical regions. The aims of the present study were to isolate and characterize Bacillus bacteria from tomato rhizospheric soil of various regions in Iran and determine the isolates that exhibit high levels of antagonistic efficiency against tomato Fusarium wilt pathogen, Fusarium oxysporum f. sp. lycopersici (Fol) and growth promotion activity. In this study, 303 Bacillus isolates were obtained from tomato rhizospheric soil. Dual culture and volatile metabolite tests were used to screen for antagonism of Bacillus isolates against Fol. Among them, 20 isolates were found to inhibit pathogen growth by 67.77% and 33.33% in dual culture and volatile metabolite tests, respectively. Based on the results of physiological tests and 16S rRNA and gyrA gene sequence analysis of 20 effective isolates, 11, seven and two isolates were identified as B. subtilis, B. velezensis and B. cereus, respectively. The results of greenhouse assessment showed that KR1-2, KR2-7 and A2-9 isolates which were characterized as Bacillus subtilis, reduced the disease index to 16.67% and promoted the plant growth by 80%. These isolates may serve as potential promising biocontrol agents against Fusarium wilt of tomato.

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The controlled lactic fermentation is a common method for food preservation. Lactic acid bacteria (LAB) manifest antagonistic activity mainly against Gram-negative bacteria but the growth of some Gram-positive is inhibited, too. Yeasts and moulds manifest slight or no sensitivity to the LAB metabolism products. In this study antagonistic activity of selected Lactobacillus strains (n=12) against fungi was investigated. Polyhydroxyalcohols (glycerol, lactitol, erythritol, sorbitol, mannitol) were added to basic MRS agar (10 g l −1 ). Lactobacillus bacteria multiplied effectively in the presence of polyhydroxyalcohols inhibiting the growth of fungi ( Fusarium latenicum, Mucor hiemalis, Aspergillus niger, Aspergillus ochraceus, Candida mycoderma, Alternaria alternata, Geotrichum candidum ). The most effective antagonistic activity was observed in the presence of sorbitol.

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Endophytic microorganisms living inside plant tissues might have numerous positive effects on the host plants. Endophytes can promote the growth and yield of the plant, help to remove contaminants from the tissues, and can suppress growth of pathogens; however, some enteric human pathogenic bacteria have also been isolated as endophytes. The aims of our study were the characterisation and identification of endophytic coliform bacteria isolated from different cultivars of sweet pepper (Capsicum annuum var. grossum) using a selective (VRBL) agar medium, and determination of antagonistic interactions between these endophytes and Listeria monocytogenes. The bacterial isolates showed heterogeneity based on their phenotypic and genotypic properties. Results of identification by molecular biological methods also confirmed the presence of different genera/species. When the antagonistic effect of the isolated endophytic bacteria was tested it was found that one isolate — identified as Pseudomonas putida — showed significant inhibition on the growth of Listeria monocytogenes.

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Acta Alimentaria
Authors: A. Lončarić, A. Pichler, N. Rašić, I. Vukoja, A. Leventić, and M. Kopjar

Nowadays, people are focusing on antioxidant-rich food due to its beneficial effect on health. Thus, the goal of this study was to investigate the interactions between catechin, quercetin, and gallic acid in the presence of sugars (sucrose and trehalose) in complex food matrix such as pomegranate juice. Antioxidant activity (AOA) was measured by three different methods, DPPH and ABTS radical scavenging activity and ferric reducing antioxidant power (FRAP). In this paper, fundamental differences among used AOA measuring methods were confirmed, which can be traced back to interactions occurring between phenols and/or sugars. Even though addition of individual phenols increased AOA of mixtures, in the majority of binary and ternary mixtures antagonistic effects were observed. Positive effect of sugar addition was more pronounced in binary mixtures but the results were highly dependent on used AOA method.

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. Ann. Phyto. Soc. St. Paul. Minn. 539 Dennis, C. and Webster, J. (1971a): Antagonism properties of species groups of Trichoderma. I. Production of non

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S91 97 Arunlakshana O, Schild HO: Some quantitative uses of drug antagonism. Br. J. Pharmacol. Chemother. 14, 48-58 (1959) Some quantitative uses of

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Introduction Warifteine, a bisbenzylisoquinoline alkaloid from Cissampelos sympodialis Eichl., produces a reversible, nonspecific, and noncompetitive antagonism of histamine, carbachol, and bradykinin. It induces contractions

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