title: Effect of five year storage on total phenolic content and antioxidant capacity of almond (Amygdalus communisL.) hull and shell from different genotypes.
abstract: OBJECTIVE
  Almond (Prunus amygdalus) hull and shell are agricultural by-products that are a source of phenolic compounds.The processing of almond produce shell and hull, accounts for more than 50% by dry weight of the almond fruits. Recently, more studies have focused on the influence of storage conditions and postharvest handling on the nutritional quality of fruits, especially the antioxidant phenolics. In this study, influence of long-term storage (five years) on the total phenolic and antioxidant capacity of almond hull and shell from different genotypes was evaluated.
  
  
  METHODS
  The fruits of subjected genotypes were collected and their hull and shell were separated. They were dried and reduced to fine powder. This powder stored at room temperature for five years. The total phenolic content (TPC) and bioactivities (antioxidant potential: DPPH and ABTS radical scavenging and reducing power) of extracts were evaluated using spectrophotometric methods.
  
  
  RESULTS
  It was found that TPC content and bioactivity levels in the stored almond hull and shell were different, compared to the hulls and shells which were evaluated in 2007. S1-4 genotype had the highest TPC and reducing power in its hull and shell.Low correlation coefficient was observed between phenolic content and the DPPH radical scavenging percentage in hull and shell extract.
  
  
  CONCLUSIONS
  For the first time, results of this investigation showed that storage can influence the antioxidant and antiradical potential of almond hull and shell.
authors.affiliation: Department of Biology, Faculty of Science, Urmia University, Urmia, Iran , I. R. Iran.
authors.forename: Khadijeh Sadat
authors.initials: KS
authors.lastname: Moosavi Dolatabadi
authors.affiliation: Department of Biology, Faculty of Natural Science, University of Tabriz, Tabriz, Iran, I. R. Iran.
authors.forename: Gholamreza
authors.initials: G
authors.lastname: Dehghan
authors.affiliation: Department of Biology, Faculty of Science, Urmia University, Urmia, Iran , I. R. Iran.
authors.forename: Siavash
authors.initials: S
authors.lastname: Hosseini
authors.affiliation: Biotechnology Research Centre, Tabriz University of Medical Sciences, Tabriz 51664-14766, Iran ; Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz 51664-14766, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Jahanban Esfahlan
keywords: Almond; Genotype; Hull; Radicalscavenging; Shell; Storage