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  • Apple polyphenolics and their antioxidant properties : influence of cultivars, post-harvest storage, and 1-MCP treatment

    Creator:
    Widyasari, Maria Angela Artania
    Abstract:
    The distribution of total phenolics, antioxidant capacity, monomeric anthocyanin, and ascorbic acid contents in the peel and flesh of Red Delicious, Granny Smith, and Fuji apples during a six-month storage period were determined. In addition, the effect of 1-MCP (1-Methyl cyclopropene) on these parameters of the edible portion of apples...
    Resource Type:
    Masters Thesis
    Full Text:
    of Red Delicious, Granny Smith, and Fuji apples during a six- month storage period were determined

  • The potato : composition, non-enzymatic browning and anthocyanins

    Creator:
    Rodriguez-Saona, Luis Enrique
    Abstract:
    Chipping varieties and model systems were used to determine the role of potato constituents on chip color. Composition was evaluated by HPLC and chip color measured using a ColorQuest colorimeter. Reducing sugar (RS) content did not completely explain color quality when present in low concentrations (<60 mg/lOOg). Levels of ascorbic...
    Resource Type:
    Dissertation
    Full Text:
    as potential source of natural red colorant. Cultivars (33) were screened for anthocyanin content

  • Influence of cultivar and maturity on blackberry polyphenolics and investigation of sediment formation in blackberry juice

    Creator:
    Siriwoharn, Thanyaporn
    Abstract:
    The influence of cultivar and maturity on polyphenolic composition and antioxidant activity was investigated by UV-Visible spectrophotometry and analytical high performance liquid chromatography (HPLC) in commercially important blackberry cultivars and selections. The anthocyanin pigments changed tremendously with ripening. Total anthocyanins increased from 74.7-317 mg/100g fw from underripe to over ripe...
    Resource Type:
    Dissertation
    Full Text:
    prevention of cancer, cardiovascular disease, and other pathologies (10,48). Blackberries are a rich source

  • Characterization of phenolics in Marion and Evergreen blackberries

    Creator:
    Siriwoharn, Thanyaporn
    Abstract:
    Frozen Marion (Rubus sp. hyb) and Evergreen blackberries (Rubus laciniatus) (whole berries, berries without seeds, and seeds alone) were acetone/ chloroform extracted. Phenolics were isolated using C₁₈ cartridges and polyamide resins, then characterized and measured by reversed-phase HPLC/diode array spectral techniques. The Polyamide isolated fractions of Marion berries contained four...
    Resource Type:
    Masters Thesis
    Full Text:
    in the diet reduce the risk of cancer and heart disease, as well as cataracts, brain and immune

  • Use of anthocyanin analyses to determine glycosidase activity in juice- and wine-processing enzymes

    Creator:
    Wightman, JoLynne Dee
    Resource Type:
    Dissertation
    Full Text:
    ........................................... 78 4.2 HPLC chromatogram, 520 nm, of anthocyanins present iii Evergreen blackberry and red sour

  • Cherry phytochemicals

    Creator:
    Chaovanalikit, Arusa, 1974-
    Abstract:
    The distribution of anthocyanin pigments and polyphenolics of sweet (Prunus avium) and sour cherries (Prunus cerasus) were determined by Ultraviolet- Visible (UV-Visible) spectrophotometry and High Performance Liquid Chromatography with photodiode array detector (HPLC-DAD). Their antioxidant properties were determined by Oxygen Radical Absorbance Capacity (ORAC) and Ferric Reducing Antioxidant Power (FRAP)....
    Resource Type:
    Dissertation
    Full Text:
    ) and the late dark red (English Morello) (27). Michigan produced about 80% of the USA sour cherry

  • Pineapple juice : phenolic composition and enzymatic browning inhibition

    Creator:
    Wen, Ling
    Abstract:
    The phenolic profile of pineapple juice was analyzed by reverse-phase HPLC/Diode Array Detector, and 9 major peaks accounting for 70% of total peak area were characterized. None of these peaks are represented by the pineapple phenolics reported to be present by previous workers. Most of the major peaks are not...
    Resource Type:
    Dissertation
    Full Text:
    prevention of cancer; cardiovascular disease, and other pathologies. Much of the literature refers to a