Among the phenolic acids we identified neochlorogenic, chlorogenic, caffeoyldeoxyhexose and p-coumaroylquinic acids. melanocarpa leaf extract ( Table 2), including 4 phenolic acids and 11 flavonoids (flavonols). We identified 15 phenolic compounds in the A. mas showed most potent antibacterial activity, as confirmed by principal component analysis (PCA). The extracts acted as bacteriostatic agents, decreasing the growth rate (ยต max) and extending the lag phase (t lag). The antibacterial activity of the plant extracts was tested against Gram-negative bacteria ( Moraxella osloensis, Pseudomonas fragi, Acinetobacter baumanii, Escherichia coli, Enterobacter aerogenes, Salmonella enterica) and Gram-positive bacteria ( Enterococcus faecium, Staphylococcus aureus, Brochothrix thermosphacta, Lactobacillus sakei, Listeria monocytogenes) using the microculture method. mas extract, as well as flavonols, ellagitannins, and iridoids. Hydroxycinnamic acid derivatives were detected in the C. superba extracts contained hydroxycinnamic acid derivatives and flavonoids (mainly flavonols). The lowest IC 50 values were found for C. The antioxidant capacity of the extracts was measured by DPPH and ABTS assays. The highest total phenolic content (TPC) was detected in C. Cornell University Press, Ithaca, NY.The purpose of this study was to investigate the composition of leaf extracts from Aronia melanocarpa, Chaenomeles superba, and Cornus mas, and their antimicrobial activity against typical spoilage-causing and pathogenic bacteria found in meat and meat products. The American Phytopathological Society, St. Laboratory Guide for Identification of Plant Pathogenic Bacteria. florida in the northwestern United States (2) however, this is the first report of P. Samples of the bacterium were sent to Texas A&M University, College Station, for fatty acid analysis, and the results confirmed the identity of P. The bacterium had a positive reaction to the Levan test and negative reactions to potato rot and arginine dihydrolase tests and was identified as Pseudomonas syringae (1). The bacterium was reisolated from inoculated plants, was characterized as gram-negative and rod-shaped, and produced fluorescent pigment on King's medium B agar. A bacterium was isolated from infected plants and tested for pathogenicity on C. Disease symptoms were restricted to early spring during wet and cool weather later in the season new growth was free of symptoms. These lesions eventually coalesced to form large dark necrotic patches that covered a large portion of the leaf or the entire leaf. In early stages, leaf infection consisted of discrete lesions, angular in shape and surrounded by a chlorotic halo. The disease affected mostly leaves and young shoots, causing dark brown necrotic lesions and some die back. mas plants within the nursery and has caused severe damage for three consecutive years. In Tennessee, a leaf blight was first observed during spring 1996 in nursery plants imported from Europe. Cornellian cherry has demonstrated longevity and adaptability and has had no previous disease or pest problems. Cornellian cherry ( Cornus mas) is an enduring dogwood that is primarily grown as an ornamental plant in North America, but in parts of Europe, its fruit is eaten fresh or pickled or made into soft drinks, wine, and liqueur.
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