The research was performed on healthy green walnut fruits and on fruits infected with Xanthomonas arboricola pv. juglandis. Fruits of cultivars 'Cisco', 'Sampion', 'Fernette', 'Seiferdorfer' and genotypes 'Zdole' and 'Erjavec' were sampled at phenophases Gf, Gf+30 and Gf+45. In the green husk tissue the content level of gallic acid, three hydroxycinnamic acids, six flavonoides was determined with the use of high-performance liquid chromatography coupled with mass spectrometry (HPLC-MS). The cumulative content of ten determined phenolics in healthy walnuts was cultivar dependent, and weakly correlated to the blight. In comparison to healthy husk tissue, the infected husks contained up to 5 fold more hydroxycinnamic acids, up to 3 fold more gallic acid, up to 4.3 fold more quercetins and up to 23 fold more catechin, what points out to the role of these phenolic compounds in the walnut resistance against bacterial blight.
COBISS.SI-ID: 6855289
Apricot is one of the most popular Prunus species grown in the temperate zone. Great variation in the contents of primary (sugars, organic acids) and secondary metabolites (phenolics) were quantified by HPLC/MS in fruit of 13 apricot cultivars. Sum of sugars ranged from 59.2 to 212.5 g kg-1 FW and sum of organic acids from 4.2 to 20.8 g kg-1 FW. Four hydroxycinnamic acids and three flavonols were quantified; their content was significantly higher in skin compared to pulp. Multivariate analysis subdivided the cultivars into five major groups, mostly indluenced by the content of individual and total phenolics as well as the antioxidant potential of apricot skin and pulp. According to high phenolic content in connection to antioxidant potential three cultivars stand out as: ‘Mula Sadik’, ‘Bergeron’ and ‘Chuan Zhi Hong’.
COBISS.SI-ID: 6551417
The fruit quality of ‘Redhaven’ peach grafted on eleven experimental rootstocks was evaluated in 2008 under replant orchard conditions. Several quality indices (weight, flesh firmness, ground color measurements, soluble solids content) were measured, and HPLC analysis were performed for numerous chemical parameters (quantification of individual sugars, organic acids, phenolic compounds in skin and in pulp). Total phenolic content and antioxidant capacity in skin and in pulp were also measured. Rootstocks influenced harvest maturity, fruit weight, yield and overall fruit quality (soluble solids content, individual and total sugar content levels, individual and total organic acids and phenolic compounds in pulp).
COBISS.SI-ID: 6376825