Viticultural wood waste as a source of polyphenols of interest: Opportunities and perspectives through conventional and emerging extraction methods

Abstract

Viticultural waste has been widely demonstrated to contain high-added value compounds named the stilbenes. Among them, trans-resveratrol (Rsv) and trans-εviniferin (Vf) are the most abundant in particular in grape canes. Various emerging methods such as ultrasound-assisted extraction (UAE), microwave-assisted extraction (MAE) or pressurized solvent extraction (PSE) have been studied to recover Rsv and Vf from grape canes in order to enhance their extraction. This paper gives a critical overview of the techniques used to this end, integrating conventional and nonconventional methods investigated in the literature as well as those used in industrial processes. It finally highlights that the unconventional technics are usually less timeconsuming than conventional extraction ones but further investigations for the discussed compounds and biomass are needed to optimize and understand the influence of the individual parameters of each extraction process.

Tackling Antibiotic Resistance with Compounds of Natural Origin: A Comprehensive Review

“…Plant extracts have a great diversity in their composition, since even from the same plant multiple completely different extracts can be obtained varying the extraction conditions. Time, temperature, solvents, pressure and other parameters such as the use of ultrasound or microwave have a huge impact on the final extract composition [ 90 ]. There is numerous evidence of the antimicrobial activity of plant extracts [ 76 , 91 ] and the synergistic effect that exists between different phytochemicals [ 80 ] when acting against different bacteria.…”

Grapevine Cane Extracts: Raw Plant Material, Extraction Methods, Quantification, and Applications

“…Grapevine canes are rich in lignin, cellulose, nitrogen, and potassium—the reason why they are highly composted in the field or burned [ 13 ]. However, they also present high contents of interesting compounds such as polyphenols, proteins, and stilbenes [ 14 ]. Stilbenes are an interesting family of non-flavonoid polyphenols that belong to the phenylpropanoid group.…”

Genotoxicity Assessment of Three Nutraceuticals Containing Natural Antioxidants Extracted from Agri-Food Waste Biomasses

“…As a consequence of its consumeristic habit, modern society deals with an excessive demand for food, food products, and material of biological origin. The environmental impact caused by the handling of this massive request must be minimized [ 1 ]. Taking into account the increase in the world population expected in the near future (9.5 billion people in 2050 and 11.2 billion people in 2100) [ 2 ], the World Health Organization considers the achievement of this minimization a mandatory task for modern society.…”

“…In the last decades, the pharmaceutical industry has become aware that the bio-waste originating from grapes and apples processing can be an important source of phytochemicals to be destined to cosmetic, pharmaceutical and food industries [ 1 , 6 , 7 , 8 , 9 ]. As a consequence, bio-waste has being recently used for the production of dietary supplements, functional foods, food additives and nutraceuticals for human consumption [ 4 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ].…”

“…An important residue of the wine-making process is the solid waste left over after the pressing and fermentation of the grapes: the grape pomace. It can be estimated that, since 20–25% in weight of processed grapes remains as pomace, 10.5–13.1 million tons of grape pomace are produced every year in the world [ 1 , 6 , 8 ]. This residue has attracted considerable attention during the last decade by virtue of its high content of health-promoting molecules [ 6 , 18 ] such as stilbenes (trans-resveratrol and ε-viniferin), phenolic acids (benzoic and hydroxycinnamic acid), simple flavonoids (catechins, flavanols, and anthocyanins), tannins and oligomeric procyanidins.…”