1.Plant material and processing
2. Chemical properties
2.1Titratable acidity, total soluble solids and pH
2.2HPLC analysis of individual sugars and organic acids
2.3Ascorbic acid content
3. Changes in antioxidant capacity and polyphenols concentration
3.1Sample preparation
3.2DPPH radical-scavenging activity
3.3Ferric ion reducing antioxidant power (FRAP)
3.4Determination of total phenolic compounds
3.5Total flavonoids acontent
3.6Total monomeric anthocyanin content
3.7Rhodanine assay for gallotannins
3.8HPLC-DAD/MSn of polyphenol and anthocyanin composition
4. Statistical analysis