Postharvest sensory and phenolic characterization of &lsquo|Elegant Lady&rsquo| and &lsquo|Carson&rsquo| peaches

Rodrigo Infante1*, Loreto Contador1, Pía Rubio1, Danilo Aros1, and Álvaro Peña-Neira2

High quality fruits are increasingly demanded along with the need to ensure this attribute to consumers. Thus, this study was aimed at characterizing a melting (‘Elegant Lady’) and a non-melting flesh (‘Carson’) peach (Prunus persica (L.) Batsch) varieties by considering both their bioactive compound contribution and their sensory quality in ripe fruit at harvest and after of cold storage. Cultivars were evaluated at harvest (F0) and after 30 d of cold storage (F30), as well as after a maturation period at 20 °C for both F0 and F30 (R0 and R30, respectively). Fruit weight, flesh firmness, soluble solid content (SSC), titratable acidity (TA), and background color (Hue) were recorded at each stage. Furthermore, total phenol content was measured and a phenolic characterization by HPLC (High-Performance Liquid Chromatography) was performed for both varieties to detect the major low molecular weight phenolic compounds present in the fruit. Finally, a trained panel assessed the main sensorial parameters at R0 and R30. Total phenol content did not change significantly as a result of cold storage and differences were probably attributed only to genotype. Low molecular weight phenolic compounds were detected in ‘Elegant Lady’ and ‘Carson’, 15 and 12, respectively; (+)-catechin was the major compound found in both cultivars, but in higher concentrations in ‘Elegant Lady’. In the phenolic characterization, ‘Elegant Lady’ was observed more closely than ‘Carson’ for flavonoids. After 30 d of cold storage, ‘Elegant Lady’ was unacceptable for consumption due to the appearance of physiological disorders such as wooliness while ‘Carson’ showed a mean score within the acceptability range.

Keywords: Quality parameters, sensory evaluation, total phenols, (+)-catechin, HPLC.
1Universidad de Chile, Department of Plant Science, Casilla 1004, Santiago, Chile *Corresponding author (rinfante@uchile.cl) 2Universidad de Chile, Department of Food Industry and Enology, Casilla 1004, Santiago, Chile.