title: Tissue microstructure, physicochemical properties, and bioactive compound locations in different sweet pepper types.
abstract: This article focuses on the location and content of some bioactive compounds in three different California sweet pepper types (red, green and yellow). The location was studied using different microscopic techniques, such as scanning electron microscopy at low temperatures (cryo-SEM) and light microscopy. Several physicochemical properties of the samples (carotenoid content, total soluble phenol content, antioxidant activity, dietary fibre content, total soluble solids content, pH and textural properties) were also examined. The degree of compaction and structuring of the cell wall was found to be indirectly related to solute transport at the cellular level and directly related to total dietary fibre content. The three types of pepper displayed formation and accumulation of phenolic aggregates and an active circulation of solutes. Yellow pepper tissue had the most labile cell walls and the highest transport of solutes. Red peppers could be suitable for obtaining extracts rich in carotenoid compounds, yellow peppers for obtaining phenolic compounds with a high antioxidant activity and green peppers for extracts with high dietary fibre content.
authors.affiliation: Research Group of Food Microstructure and Chemistry, Department of Food Technology, Universitat Politècnica de València, Valencia, Spain maherca2@upvnet.upv.es.
authors.forename: María
authors.initials: M
authors.lastname: Hernández-Carrión
authors.affiliation: Research Group of Food Microstructure and Chemistry, Department of Food Technology, Universitat Politècnica de València, Valencia, Spain.
authors.forename: Isabel
authors.initials: I
authors.lastname: Hernando
authors.affiliation: Research Group of Food Microstructure and Chemistry, Department of Food Technology, Universitat Politècnica de València, Valencia, Spain.
authors.forename: Amparo
authors.initials: A
authors.lastname: Quiles
mesh_terms: D000975:Antioxidants / Q000032:analysis*; D001692:Biological Transport; D002212:Capsicum / Q000737:chemistry* / Q000648:ultrastructure; D002338:Carotenoids / Q000032:analysis*; D002473:Cell Wall; D004043:Dietary Fiber / Q000032:analysis*; D005638:Fruit / Q000737:chemistry* / Q000648:ultrastructure; D006801:Humans; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D010636:Phenols / Q000032:analysis*
chemical_list: D000975:Antioxidants; D004043:Dietary Fiber; D010636:Phenols; D002338:Carotenoids
keywords: Microstructure; carotenoids; dietary fibre; phenolic compounds; sweet pepper