Format

Send to

Choose Destination
Food Chem. 2019 Jul 15;286:600-607. doi: 10.1016/j.foodchem.2019.02.040. Epub 2019 Feb 19.

Cysteine enhances the content of betalains and polyphenols in fresh-cut red beet.

Author information

1
Department of Biological Sciences, Escola Superior de Agricultura 'Luiz de Queiroz' - University of Sao Paulo, Pádua Dias 11, 13.418-900 Piracicaba, Sao Paulo, Brazil. Electronic address: appreczenhak@usp.br.
2
Department of Biological Sciences, Escola Superior de Agricultura 'Luiz de Queiroz' - University of Sao Paulo, Pádua Dias 11, 13.418-900 Piracicaba, Sao Paulo, Brazil.
3
Sao Paulo State University, Department of Chemistry and Biochemistry, Institute of Bioscience, 18.618-000 Botucatu, Sao Paulo, Brazil.

Abstract

This study investigated the effectiveness of cysteine in conservation of bioactive compounds and the antioxidant capacity of minimally processed red beet. After red beet minimal processing increasing cysteine concentrations were applied, corresponding to control, 2 mM, 4 mM, 8 mM and 16 mM. Assay was performed over 15 d to evaluate the polyphenols, betalains, antioxidant capacity and enzymatic activity of polyphenol oxidase (PPO) and phenylalanine ammonia lyase (PAL). Cysteine enhanced the gallic acid, caffeic acid, chlorogenic acid, kaempferol and betalain contents until 6 d of storage. Subsequently, dosages of cysteine above 4 mM maintained gallic acid, kaempferol and betalains contents. Cysteine appears to influence the phenylpropanoid pathway, favoring the accumulation of polyphenols and betalains. In red beet, cysteine did not inhibit PPO activity but enhanced PAL activity. Betalains contribute more than phenolics to the antioxidant capacity, and their relationship with cysteine has not been thoroughly elucidated to date.

KEYWORDS:

Antioxidant activity; Betalains; Phenylpropanoid pathway; Polyphenol oxidase; Polyphenols

PMID:
30827652
DOI:
10.1016/j.foodchem.2019.02.040
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center