title: Clarification of pomegranate juice with chitosan: changes on quality characteristics during storage.
abstract: In this study, for the first time, the use of chitosan as a clarifying agent in the production of clear pomegranate juice was evaluated and its effects on quality characteristics of juice were investigated. A central composite face centered design was used to establish the optimum conditions for clarification of pomegranate juice (PJ) using response surface methodology. The three factors were concentration of chitosan (10-120 mg/100ml), process temperature (10-20°C), and process time (30-90 min) and their effects on turbidity and a(∗) values were investigated. Using a desirability function method, the optimum process conditions were found to be 68.93 mg/100ml chitosan at a process temperature and time of 10°C and 30 min, respectively. PJ was produced using the optimum conditions and the quality characteristics such as turbidity, colour characteristics (L(∗), a(∗), b(∗), C(∗)), titratable acidity, total phenolic, monomeric anthocyanin, and protein contents were evaluated during storage at 4 and 20°C for 6 months.
authors.affiliation: Ege University, Faculty of Engineering, Department of Food Engineering, Bornova, 35100 Izmir, Turkey. Electronic address: otastan07@gmail.com.
authors.forename: Ozge
authors.initials: O
authors.lastname: Tastan
authors.affiliation: Ege University, Faculty of Engineering, Department of Food Engineering, Bornova, 35100 Izmir, Turkey.
authors.forename: Taner
authors.initials: T
authors.lastname: Baysal
mesh_terms: D000872:Anthocyanins / Q000032:analysis*; D048271:Chitosan / Q000737:chemistry*; D061353:Food Storage; D029561:Lythraceae / Q000737:chemistry*; D010636:Phenols / Q000032:analysis*
chemical_list: D000872:Anthocyanins; D010636:Phenols; D048271:Chitosan
keywords: Carbazole (PubChem CID: 6854); Chitosan; Clarification; Coomassie Brilliant Blue G 250 (PubChem CID: 6333920); Ethanol (PubChem CID: 702); Gallic acid (PubChem CID: 370); Juice quality; N-carboxymethyl chitosan (PubChem CID: 135280430); Pomegranate juice; Potassium chloride (PubChem CID: 4873); Response surface methodology; Sodium acetate (PubChem CID: 517045); Sodium carbonate (PubChem CID: 10340); Sulfuric acid (PubChem CID: 1118)