| AAE | Ascorbic acid equivalents |
| ANOVA | Analysis of variance |
| ASE | Accelerated solvent extraction |
| CCRD | Central composite rotatable design |
| CE | Catechin equivalents |
| CRSAmax | Concentration of the extract that provides the maximum radical-scavenging activity |
| CSE | Conventional solvent extraction |
| DAD | Diode array detector |
| DM | Dry matter |
| DPPH | α,α-diphenyl-β-picrylhydrazyl |
| FRAP | Ferric reducing antioxidant power |
| GAE | Gallic acid equivalents |
| GRAS | Generally recognized as safe |
| HPLC | High-performance liquid chromatography |
| IC50 | Concentration of the extract that provides 50% of the radical-scavenging activity |
| MAE | Microwave-assisted extraction |
| PH | Pistachio hull |
| RSA | Radical-scavenging activity |
| RSAmax | Maximum radical-scavenging activity |
| RSM | Response surface methodology |
| TFC | Total flavonoid content |
| THTC | Total hydrolyzable tannin content |
| TPC | Total phenolic content |
| TPrC | Total proanthocyanidin content |
| TTC | Total tannin content |
| UAE | Ultrasonic-assisted extraction |
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