Potential applications of by-products from the coffee industry in polymer technology – Current state and perspectives. (15th February 2021)

• Record Type: Journal Article
• Authors: Hejna, Aleksander
• Is Part Of: Waste management. Volume 121(2021)
• Page Start: 296
• Page End: 330
• Publication Date: 2021-02-15
• Subjects: Coffee -- Coffee by-products -- Recycling -- Polymers -- Polymer composites; APTES (3-aminopropyl)triethoxysilane -- BOD biological oxygen demand -- CFAQs diesters of caffeoylferuloyl-quinic acids -- CGAs chlorogenic acids -- CH coffee husk -- CM coffee mucilage -- CNCs cellulose nanocrystals -- CP coffee pulp -- CPC coffee parchment -- CQAs caffeoylquinic acids -- CSS coffee silverskin -- CW coffee wastewater -- diCQA dicaffeoylquinic acids -- DSC differential scanning calorimetry -- DPPH 2, 2-diphenyl-1-picryl-hydrazyl-hydrate -- EBS ethylene bis-stearamide -- FQA feruloylquinic acids -- FTIR Fourier-transform infrared spectroscopy -- GAE gallic acid equivalents -- HDPE high-density polyethylene -- LLDPE linear low-density polyethylene -- MA maleic anhydride -- MAPE maleic anhydride-grafted polyethylene -- MAPP maleic anhydride-grafted polypropylene -- MDI 4, 4′-methylene diphenyl diisocyanate -- MLO maleinized linseed oil -- NFCs natural fiber composites -- PBAT poly(butylene adipate-co-terephthalate) -- PBAT/PHBV poly(butylene adipate-co-terephthalate)/poly(3-hydroxybutyrate-co-3-hydroxyvalerate) -- PBS poly(butylene succinate) -- PCL poly(ε-caprolactone) -- pCoQAs p-coumaroylquinic acids -- PEG poly(ethylene glycol) -- PHA polyhydroxyalkanoate -- PHB polyhydroxybutyrate -- PLA poly(lactic acid) -- PP polypropylene -- PVA poly(vinyl alcohol) -- SCG spent coffee grounds -- SEM scanning electron microscopy -- TPS thermoplastic starch -- WPCs wood polymer composites; Hazardous wastes -- Periodicals; Refuse and refuse disposal -- Periodicals; 363.728
• DOI: 10.1016/j.wasman.2020.12.018
• Languages: English
• ISSNs: 0956-053X

Abstract

Highlights: This paper covers the coffee production process, with emphasis on by-products. The chemical composition of generated by-products was reviewed. The application of coffee industry by-products in polymer technology was reviewed. Potential benefits of coffee industry by-products recycling were highlighted. Coffee industry by-products may act as antioxidants for polymeric materials. Abstract: Coffee is one of the most popular beverages in the world, and its popularity is continuously growing, which can be expressed by almost doubling production over the last three decades. Cultivation, processing, roasting, and brewing coffee are known for many years. These processes generate significant amounts of by-products since coffee bean stands for around 50% of the coffee cherry. Therefore, considering the current pro-ecological trends, it is essential to develop the utilization methods for the other 50% of the coffee cherry. Among the possibilities, much attention is drawn to polymer chemistry and technology. This industry branch may efficiently consume different types of lignocellulosic materials to use them as fillers for polymer composites or as intermediate sources of particular chemical compounds. Moreover, due to their chemical composition, coffee industry by-products may be used as additives modifying the oxidation resistance, antimicrobial, or antifungal properties of polymeric materials. These issues should be considered especially important in the case of biodegradable polymers, whose popularity is growing over the last years. This paper summarizes the literature reports related to the generation and composition of the coffee industry by-products, as well as the attempts of their incorporation into polymer technology. Moreover, potential directions of research based on the possibilities offered by the coffee industry by-products are presented.