Biomass Resources for Biorefinery Application

Upadhayay, Varsha; Joshi, Ritika; Kuila, Arindam

doi:10.1002/9781119593065.ch3

Cited by 1 publication

(1 citation statement)

References 32 publications

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“…Unfortunately, about 1.3 billion tons of agricultural by-products, including leaves, seeds and skins are wasted each year [ 2 ] and are landfilled or incinerated even though they may contain large amounts of bioactive compounds. These practices only increase the environmental load and the total cost of production [ 11 , 12 ]. In the specific case of guava, approximately 80 kg of this by-product per metric ton of fresh fruit is produced during guava processing [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Extraction Method on the Polyphenolic Profile and the Antioxidant Activity of Psidium guajava L. Leaf Extracts

Gutierrez Montiel,

Guerrero Barrera,

Martínez Ávila

et al. 2023

Molecules

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The leaves of Psidium guajava L. are an agro-industrial by-product with an outstanding content of polyphenolic compounds; however, there are many factors which can affect the phytochemical profile when valuing this type of plant material, such as temperatures and extraction times involving in the extraction methods applied. In this context, this study analyzed the impact of different extraction methods (Soxhlet, maceration and ultrasound-assisted extraction) on the phytochemical profile (FTIR and UPLC-MS) and the antioxidant activity (ABTS, FRAP and Folin–Ciocalteu) of guava leaf extracts. A yield of phenolic compounds per gram of guava leaf was obtained within the range of 16 to 45 mg/g; on the other hand, the IC50 values determined with the ABTS assay ranged between 78 ± 4 to 152 ± 12 µg/mL. The methanolic extract obtained by Soxhlet was the one with the best reducing power, both in the FRAP assay and in the Folin–Ciocalteu assay. Finally, bioactive compounds such as quercetin, kaempferol and avicularin were identified in the guava leaf extract. It was concluded that the purification of polyphenolics compounds improves the antioxidant capacity, and that the extraction method greatly influences the phytochemical profile and activity of the extracts.

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