Bioactive Compounds from Leaves and Twigs of Guayule Grown in a Mediterranean Environment
1
National Research Council, Institute for the Animal Production System in Mediterranean Environment, Traversa La Crucca 3, località Baldinca, 07100 Sassari, Italy
2
National Research Council, Institute of Sciences of Food Production, Traversa La Crucca 3, località Baldinca, 07100 Sassari, Italy
*
Author to whom correspondence should be addressed.
Plants 2020, 9(4), 442; https://doi.org/10.3390/plants9040442
Received: 13 March 2020
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Revised: 28 March 2020
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Accepted: 29 March 2020
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Published: 2 April 2020
Guayule (Parthenium argentatum) is one of the most promising alternatives to produce natural rubber. As the guayule leaves represent a waste byproduct in the rubber extraction process, their exploitation might contribute to the valorization of the whole plant biomass. The specific aim of our study was to determine the antioxidant capacity and the content of phenolic compounds in leaves and twigs of different guayule lines cultivated in a Mediterranean environment. The antioxidant capacity and the contents of phenolic were affected significantly by guayule accession and harvest time. Overall means in twigs represented about 60% of the corresponding leaf values for antioxidant capacity as DPPH (1,1-diphenyl-2-picrylhydrazyl) and not tannic phenolic and about 55% as ABTS (2,2′-azinobis (3-ethylbenzothiazoline-6-sulphonic acid) diammonium salt), total phenolic, tannic phenolic and total flavonoid contents. Five individual phenolic compounds were identified in methanolic extracts of leaves. Neochlorogenic acid (62.5–174.8 mg g−1 DW) and chlorogenic acid (28.6–41.1 mg g−1 DW) were the most abundant phenolic acids. In addition to the compounds quantified in leaves, cynarin was identified only in twigs and for the first time in guayule biomass. Our results indicate that guayule leaves and twigs represent a rich source of antioxidants for potential applications in fodder, nutraceutical and pharmacological sectors.
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MDPI and ACS Style
Piluzza, G.; Campesi, G.; Molinu, M.G.; Re, G.A.; Sulas, L. Bioactive Compounds from Leaves and Twigs of Guayule Grown in a Mediterranean Environment. Plants 2020, 9, 442. https://doi.org/10.3390/plants9040442
AMA Style
Piluzza G, Campesi G, Molinu MG, Re GA, Sulas L. Bioactive Compounds from Leaves and Twigs of Guayule Grown in a Mediterranean Environment. Plants. 2020; 9(4):442. https://doi.org/10.3390/plants9040442
Chicago/Turabian StylePiluzza, Giovanna, Giuseppe Campesi, Maria G. Molinu, Giovanni A. Re, and Leonardo Sulas. 2020. "Bioactive Compounds from Leaves and Twigs of Guayule Grown in a Mediterranean Environment" Plants 9, no. 4: 442. https://doi.org/10.3390/plants9040442
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