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Abstract

Lactic Fermentation Increases Antioxidant Capacity and Phenolic Compounds in White and Red Varieties of Quinoa †

by
Rui Chu
,
Eulalia Uaila
and
Claudia E. Lazarte
*
Department of Food Technology, Engineering and Nutrition, Lund University, SE-221 00 Lund, Sweden
*
Author to whom correspondence should be addressed.
†
Presented at the 14th European Nutrition Conference FENS 2023, Belgrade, Serbia, 14–17 November 2023.
Proceedings 2023, 91(1), 78; https://doi.org/10.3390/proceedings2023091078
Published: 23 November 2023
(This article belongs to the Proceedings of The 14th European Nutrition Conference FENS 2023)
Versions Notes

Abstract

:
Quinoa (Chenopodium quinoa Willd.) is a pseudocereal originally grown in the Andean region of South America. Due to its nutritional and functional properties, as well as its tolerance to harsh environments, quinoa has garnered increased attention in recent decades, with its production expanding to Europe and Asia. Polyphenols are secondary by-products of plants, exhibit positive impacts on health, including anti-mutagenic and antioxidant activities, which protect against oxidative-induced stress. This study focused on investigating changes in antioxidant capacity and phenolic compounds in white and red quinoa varieties during lactic acid fermentation with Lactobacillus plantarum 299v®. Throughout fermentation, pH and lactic acid formation were monitored every two hours until the pH dropped below 4.6. Samples before and after fermentation were analyzed for antioxidant capacities using 2,2-diphenyl-1-pic-ylhydrazyl (DPPH) and ferric ion-reducing antioxidant power assay (FRAP). The total polyphenol content (TPC) was measured using the Folin–Ciocalteu method, and the polyphenol profile was identified and quantified by UPLC-MS-UV. The findings revealed that fermentation led to a significant increase (p < 0.001) in TPC from 4.03 to 7.68 mgGAE/100 g and from 4.35 to 7.96 mgGAE/100 g for the white and red quinoa varieties respectively. Fermentation showed a significantly positive impact on the iron-reducing antioxidant capacity of quinoa (p < 0.05). Red quinoa had higher antioxidant levels than the white variety, with a similar trend observed in the DPPH assay. After fermentation, the antioxidant capacity in white and red quinoa increased from 7.90 ± 0.03 to 10.48 ± 0.11 (mgTE/100 g) and from 8.78 ± 0.06 to 11.75 ± 0.10 (mgTE/100 g), respectively. Furthermore, fermentation significantly (p < 0.001) increased the content of polyphenols with high antioxidant power such as epi-catechin, catechin, 4-Hydroxybenzoic acid, vanillic acid, chlorogenic acid, rutin and quercetin in both red and white varieties. In conclusion, lactic fermentation proved to be effective for increasing the phenolic content and antioxidant capacities of both quinoa varieties.

Author Contributions

R.C. conducted the experimental work and data analysis. E.U. assisted with the experimental work. C.E.L. conceptualization, supervision, data analysis, writing and presenting. All authors have read and agreed to the published version of the manuscript.

Funding

This research was founded by Albert Påhlsson Foundation.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

Data available upon request.

Conflicts of Interest

The authors declare no conflict of interest.
Disclaimer/Publisher’s Note: The statements, opinions and data contained in all publications are solely those of the individual author(s) and contributor(s) and not of MDPI and/or the editor(s). MDPI and/or the editor(s) disclaim responsibility for any injury to people or property resulting from any ideas, methods, instructions or products referred to in the content.

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MDPI and ACS Style

Chu, R.; Uaila, E.; Lazarte, C.E. Lactic Fermentation Increases Antioxidant Capacity and Phenolic Compounds in White and Red Varieties of Quinoa. Proceedings 2023, 91, 78. https://doi.org/10.3390/proceedings2023091078

AMA Style

Chu R, Uaila E, Lazarte CE. Lactic Fermentation Increases Antioxidant Capacity and Phenolic Compounds in White and Red Varieties of Quinoa. Proceedings. 2023; 91(1):78. https://doi.org/10.3390/proceedings2023091078

Chicago/Turabian Style

Chu, Rui, Eulalia Uaila, and Claudia E. Lazarte. 2023. "Lactic Fermentation Increases Antioxidant Capacity and Phenolic Compounds in White and Red Varieties of Quinoa" Proceedings 91, no. 1: 78. https://doi.org/10.3390/proceedings2023091078

APA Style

Chu, R., Uaila, E., & Lazarte, C. E. (2023). Lactic Fermentation Increases Antioxidant Capacity and Phenolic Compounds in White and Red Varieties of Quinoa. Proceedings, 91(1), 78. https://doi.org/10.3390/proceedings2023091078

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