2.3. Extraction and carotenoid analysis
All extractions were carried out in triplicate according to procedures developed specifically for the analysis of banana tissues. One hundred milligram aliquots of powdered lyophilized fruit pulp were homogenized for 30 s at maximum speed in a ‘Fast Prep’ Reciprocal shaker in 400 mL of ice-cooled extraction solvent. The extraction solvents consisted of tetrahydrofuran:methanol (THF:MeOH), 1:1 (v/v), containing 0.25% butylated hydroxytoluene (BHT) and 2% insoluble polyvinylpolypyrrolidone (PVPP) (Davey et al., 2006, 2009a). Following centrifugation (14,000 rpm for 20 min at 4 8C), the supernatant was transferred to a fresh micro-centrifuge tube and the pellet was re-extracted twice with 400 mL of THF:MeOH,
1:1 (v/v), containing 0.25% (BHT) without PVPP. Supernatants were collected and combined, and 8-apo b-carotene at a final concentration of 0.002 mg/ml added as an internal standard.
2.3. Extraction and carotenoid analysisAll extractions were carried out in triplicate according to procedures developed specifically for the analysis of banana tissues. One hundred milligram aliquots of powdered lyophilized fruit pulp were homogenized for 30 s at maximum speed in a ‘Fast Prep’ Reciprocal shaker in 400 mL of ice-cooled extraction solvent. The extraction solvents consisted of tetrahydrofuran:methanol (THF:MeOH), 1:1 (v/v), containing 0.25% butylated hydroxytoluene (BHT) and 2% insoluble polyvinylpolypyrrolidone (PVPP) (Davey et al., 2006, 2009a). Following centrifugation (14,000 rpm for 20 min at 4 8C), the supernatant was transferred to a fresh micro-centrifuge tube and the pellet was re-extracted twice with 400 mL of THF:MeOH,1:1 (v/v), containing 0.25% (BHT) without PVPP. Supernatants were collected and combined, and 8-apo b-carotene at a final concentration of 0.002 mg/ml added as an internal standard.
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