Abstract
Roselle is a plant that accumulates anthocyanins significantly, hence its importance as food coloring and as a source of antioxidant compounds for human health. This study was aimed to determine phenolic composition and antioxidant capacity of methanolic extracts, and beverages obtained from native roselle cultivars in Mexico (Negra, Sudan, Rosa and Blanca) with different degrees of pigmentation, and to establish the color-composition relationship. Chromatographic methods were used to determine phenolic compounds: flavanols, flavonols, benzoic, hibiscus and phenolic acids as well as two main anthocyanins (cyanidin 3-sambubioside and delphinidin 3-sambubioside). The antioxidant capacity was evaluated by ABTS and FRAP assays. Tristimulus colorimetry showed to be a useful technique to determine the color-composition relationship, leading to equations that allowed to predict anthocyanin content of roselle (R > 0.84). Also, a stepwise linear discriminant analysis (SLDA) was developed in order to classify roselle cultivars. The obtained mathematical model could be an important tool to be used in colorimetric characterization of functional compounds used in food processing.
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Abbreviations
- DIA:
-
digital image analysis
- Dp3Sa:
-
delphinidin-3-sambubioside
- Cy3Sa:
-
cyanidin-3-sambubioside
- LDA:
-
linear discriminant analysis
- SLDA:
-
stepwise linear discriminant analysis
- TA:
-
total anthocyanins
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Acknowledgments
Authors thank to Colegio Superior de Agricultura del Estado de Guerrero (CSAEGRO) and Quintín Obispo González for biological samples. Camelo-Méndez G.A also acknowledges to CONACYT-Mexico and SIP-IPN scholarships.
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Camelo-Méndez, G.A., Jara-Palacios, M.J., Escudero-Gilete, M.L. et al. Comparative Study of Phenolic Profile, Antioxidant Capacity, and Color-composition Relation of Roselle Cultivars with Contrasting Pigmentation. Plant Foods Hum Nutr 71, 109–114 (2016). https://doi.org/10.1007/s11130-015-0522-5
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DOI: https://doi.org/10.1007/s11130-015-0522-5