Mango (Mangifera indica) Kernel: Chromatographic Analysis of the Tannin, and Stability Study of the Associated Polyphenol Oxidase Activity

Identification of (−)-epicatechin as the direct substrate for polyphenol oxidase isolated from litchi pericarp

“…The spectrum had also the fragment ions at m/z 245.1 due to the loss of a -CH 2 CHOHgroup and m/z 170.9 due to the loss of A-ring ([M-H-CH 2 CHOH-C 6 H 2 ] À ), as reported by Sudjaroen et al (2005) and Zhang et al (2005). (À)-Epicatechin has also been identified from other fruits, such as apple peels (Alonso-Salces et al, 2004), mango kernels (Arogba, 2000) and pear skins (Siegelman, 1955).…”

Identification of (−)-epicatechin as the direct substrate for polyphenol oxidase from longan fruit pericarp

“…In combination with the data of [a] D , 1 H NMR, 13 C NMR and ESI-MS, the direct substrate for PPO from pericarp tissues of longan fruit was identified as (À)-epicatechin. (À)-Epicatechin has also been identified from other fruit tissues, such as apple peel (Alonso-Salces et al, 2004), mango kernel (Arogba, 2000), pear skin (Siegelman, 1955;Veberic et al, 2005) and apricot fruit (Radi, Mahrouz, Jaouad, & Amiot, 2004). Furthermore, the contents of (À)-epicatechin of fruit pericarp tissues of longan fruit were determined by HPLC.…”

Effects of sulphur preservative on phytochemical and antioxidant capacity of peels of mango cultivars (Mangifera indica L.) produced in South Africa

“…Studies have been conducted on the utilization of mango kernels as a source of fat (Arogba, 2002), natural antioxidants (Kaur, 2004), starch (Moharram and Moustafa, 1982), flour (Puravankara et al, 2000) and feed (Ravindran and Sivakanesan, 1996) but studies on peels are scarce (Berardini et al, 2005). Most of the studies on the exploitation of mango peels dealt with their use as a source of pectin, which is considered a high quality dietary fiber (Beerh et al, 1976;Srirangarajan and Shrikhande, 1976;Tandon et al, 1991;Pedroza-Islas and Aguilar-Esperanza, 1994;Tandon and Garg, 1999).…”