title: Impact of Precooling and Controlled-Atmosphere Storage on γ-Aminobutyric Acid (GABA) Accumulation in Longan (Dimocarpus longan Lour.) Fruit.
abstract: Longan (Dimocarpus longan Lour.) fruit cultivars 'Chuliang' and 'Shixia' were analyzed for γ-aminobutyric acid (GABA) accumulation after precooling and in controlled-atmosphere storage. Fruit were exposed to 5% O2 plus 3%, 5%, or 10% CO2 at 4 °C, and GABA and associated enzymes, aril firmness, and pericarp color were measured. Aril softening and pericarp browning were delayed by 5% CO2 + 5% O2. GABA concentrations and glutamate decarboxylase (GAD; EC 4.1.1.15) activities declined during storage at the higher-CO2 treatments. However, GABA aminotransferase (GABA-T; EC 2.6.1.19) activities in elevated CO2-treated fruit fluctuated during storage. GABA concentrations increased after precooling treatments. GAD activity and GABA-T activity were different between cultivars after precooling. GABA concentrations in fruit increased after 3 days of 10% CO2 + 5% O2 treatment and then declined as storage time increased. GABA accumulation was associated with stimulation of GAD activity rather than inhibition of GABA-T activity.
authors.affiliation: College of Food Science, South China Agricultural University , Guangzhou 510642, People's Republic of China.
authors.forename: Molin
authors.initials: M
authors.lastname: Zhou
authors.affiliation: College of Food Science, South China Agricultural University , Guangzhou 510642, People's Republic of China.
authors.forename: Kessy H
authors.initials: KH
authors.lastname: Ndeurumio
authors.affiliation: College of Food Science, South China Agricultural University , Guangzhou 510642, People's Republic of China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhao
authors.affiliation: College of Food Science, South China Agricultural University , Guangzhou 510642, People's Republic of China.
authors.forename: Zhuoyan
authors.initials: Z
authors.lastname: Hu
mesh_terms: D001272:Atmosphere; D002245:Carbon Dioxide / Q000737:chemistry; D003080:Cold Temperature; D061353:Food Storage; D005638:Fruit / Q000737:chemistry*; D005968:Glutamate Decarboxylase / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D029631:Sapindaceae / Q000737:chemistry*; D005680:gamma-Aminobutyric Acid / Q000032:analysis*
chemical_list: D002245:Carbon Dioxide; D005680:gamma-Aminobutyric Acid; D005968:Glutamate Decarboxylase; D010100:Oxygen
keywords: CO2; Dimocarpus longan Lour.; carbon dioxide; controlled-atmosphere storage; longan fruit; precooling; γ-aminobutyric acid (GABA)