Search Results

You are looking at 1 - 10 of 333 items for :

  • "polyphenol" x
Clear All
Free access

Daniel Ferreira Holderbaum, Tomoyuki Kon, Tsuyoshi Kudo and Miguel Pedro Guerra

Apples ( Malus × sylvestris var. domestica ) are an important source of polyphenols (phenolic compounds) in the human diet ( Hertog et al., 1992 ) and a classic example of fruit susceptibility to enzymatic browning, which is a major problem for

Free access

Matthew A. Escobar, Andrew Shilling, Pine Higgins, Sandra L. Uratsu and Abhaya M. Dandekar

Polyphenol oxidase (PPO) is a Type 3 copper protein, which catalyzes the oxidation of monophenols or o -diphenols to o -quinones ( Klabunde et al., 1998 ). PPO-generated quinones are highly reactive and will crosslink with proteins or polymerize

Restricted access

Brianna L. Ewing, Gregory M. Peck, Sihui Ma, Andrew P. Neilson and Amanda C. Stewart

., 2017 ). Therefore, it is important to develop strategies, perhaps through harvest and storage management practices, that maximize the concentration of endogenous tannins in the fruit. Polyphenols are a class of secondary plant metabolites derived

Free access

Masahumi Johkan, Kazuhiro Shoji, Fumiyuki Goto, Shin-nosuke Hashida and Toshihiro Yoshihara

, polyphenols, and antioxidant activity of lettuce seedlings treated with different light spectra were also determined. Materials and Methods Plant growth. Seeds of red leaf lettuce ( Lactuca sativa L. cv. Banchu Red Fire; Takii Seed Co., Kyoto, Japan) were

Restricted access

Gregory Peck, Megan McGuire, Thomas Boudreau IV and Amanda Stewart

index (SPI) and internal ethylene concentration (IEC), fruit quality factors are often measured to gauge harvest maturity ( Watkins, 2003 ). For cider production, fruit quality attributes also include polyphenol and YAN concentrations in the fruit, and

Free access

Fatemeh Khodadadi, Masoud Tohidfar, Mehdi Mohayeji, Abhaya M. Dandekar, Charles A. Leslie, Daniel A. Kluepfel, Timothy Butterfield and Kourosh Vahdati

). Presence of the P14a and JrPPO-1 genes in both ‘Serr’ and ‘Chandler’ was demonstrated using standard PCR to amplify 0.5-kb fragments from genomic DNA ( Fig. 2 ). Fig. 1. Polyphenol oxidase (PPO) enzymatic activity in leaves of walnut cultivars Serr and

Full access

Ryohei Koyama, Hiromichi Itoh, Syuji Kimura, Ai Morioka and Yuichi Uno

than any other food ( Gupta and Prakash, 2008 ). Plants can synthesize some antioxidants including, for example, AsA, glutathione, α-tocopherol (vitamin E), and polyphenol to protect themselves against oxidative damage caused by environmental stressors

Free access

Nobuyuki Fukuoka, Takamoto Suzuki, Keisuke Minamide and Tatsuro Hamada

, 1987 ), leaves from sun-exposed locations in midsummer may contain a larger amount of CGA to scavenge abundant ROS. However, because G. bicolor is a minor crop, there has been little research on this plant and no reports of changes in polyphenol

Free access

Fhatuwani N. Mudau, Puffy Soundy and Elsa S. du Toit

Herbal teas have high concentrations of total polyphenols ( Owour et al., 2000 ; Venkatesan et al., 2004 ). Polyphenols are known to posses a wide range of beneficial biochemical and physiological properties ( Hirasawa et al., 2002 ). The major

Full access

Fhatuwani N. Mudau, Puffy Soundy and Elsa S. du Toit

, 2006) found that single applications of 300 kg·ha −1 N, 300 kg·ha −1 P, and 200 kg·ha −1 K maximized bush tea growth and leaf total polyphenols in all four seasons. According to Hirasawa et al. (2002) , total polyphenols are the primary indicator