title: Effect of ultrasound on different quality parameters of apple juice.
abstract: Fresh apple juice treated with ultrasound (for 0, 30, 60 and 90 min, at 20 °C, 25 kHz frequency) was evaluated for different physico-chemical, Hunter color values, cloud value, antioxidant capacity, scavenging activity on 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical, ascorbic acid, total phenolics, flavonoids, flavonols and microbial characteristics. No significant effect of sonication was observed on pH, total soluble solids (°Brix) and titratable acidity of apple juice. Sonication significantly improved ascorbic acid, cloud value, phenolic compounds, antioxidant capacity, DPPH free radical scavenging activity and differences in Hunter color values. Moreover, significant reduction in microbial population was observed. Findings of the present study suggested that sonication treatment could improve the quality of apple juice. It may successfully be employed for the processing of apple juice with improved quality and safety from consumer's health point of view.
authors.affiliation: College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China.
authors.forename: Muhammad
authors.initials: M
authors.lastname: Abid
authors.forename: Saqib
authors.initials: S
authors.lastname: Jabbar
authors.forename: Tao
authors.initials: T
authors.lastname: Wu
authors.forename: Malik Muhammad
authors.initials: MM
authors.lastname: Hashim
authors.forename: Bing
authors.initials: B
authors.lastname: Hu
authors.forename: Shicheng
authors.initials: S
authors.lastname: Lei
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.forename: Xiaoxiong
authors.initials: X
authors.lastname: Zeng
mesh_terms: D001628:Beverages / Q000382:microbiology / Q000592:standards*; D005511:Food Handling / Q000379:methods* / Q000592:standards; D063427:Food Quality; D027845:Malus / Q000737:chemistry / Q000382:microbiology; D013010:Sonication