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The current era witnesses a remarkable advancement in biomass utilization, guided by the principles of green chemistry and biorefinery and the comprehensive exploitation of plant-based raw materials. Predominantly, large-scale production methods have been pursued, akin to approaches in the oil industry, enabling the incorporation of novel products into energy and petrochemical markets. However, the viability of such systems on a small and medium scale is hindered by logistical challenges and the constraints of economies of scale. For small agricultural producers and food processing companies, the complete utilization of biomass transcends environmental responsibility, evolving into a strategy for survival through the diversification of by-products with enhanced value. The state of Rio de Janeiro in Brazil presents a range of population dynamics, geographical features, climate conditions, and agricultural production patterns that closely resemble those found in various tropical countries and agricultural regions worldwide. This region, sustaining a green belt supporting 17 million people, provides an apt case study for investigating chemical compounds with potential value among agro-industrial residues, which can motivate the creation of a lucrative biotechnological industry. Examples include naringenin and hesperidin from oranges and lemons, epi-gallo-catechin gallate from bananas, caffeic acids from coffee, and the bromelain enzyme from pineapples. This study addresses the challenges associated with developing biotechnological alternatives within the agroindustry, considering economic, technological, logistical, and market-related aspects. The insights from examining the Brazilian state of Rio de Janeiro will contribute to the broader discourse on sustainable biomass utilization and the creation of value-added by-products. [ABSTRACT FROM AUTHOR]

This review article addresses the antioxidant properties of different natural products, including ascorbic acid, gallic acid, oxalic acid, L-glutathione (GSH), bacteriorhodopsin, green tea polyphenols, glucose, hydroxycinnamic acid, ethanoic acid, betanin, and L-glutathione, in the reduction of graphene oxide (rGO). rGO can cause damage to cells, including oxidative stress and inflammation, limiting its application in different sectors that use graphene, such as technologies used in medicine and dentistry. The natural substances reviewed have properties that help reduce this damage, neutralizing free radicals and maintaining cellular integrity. This survey demonstrates that the combination of these antioxidant compounds can be an effective strategy to minimize the harmful effects of rGO and promote cellular health. [ABSTRACT FROM AUTHOR]

The purification and recovery of bioactive compounds in food and food waste has been a growing topic within the literature. One of the most used techniques for these processes is through the application of macroporous polymeric resins (MPRs). MPRs have high adsorption and desorption capacities for substances such as polyphenols and sugars that are present in extracts and industrial effluents. There are currently several resins on the market (copolymers of styrenedivinylbenzene, acrylic, sulfonic, or cyanamide); however, a lack of information in the literature regarding the efficiency of analyte recovery and the different physicochemical characteristics of the MPRs means that no broad correlations have been made. Upon compiling the information gained from a comprehensive bibliographic review, using databases such as ScienceDirect and Web of Science, it was possible to classify the different types of resins. In addition, this review will discuss the use of isothermal equations (Langmuir and Freundlich) in experimental data, which can provide quantitative and qualitative parameters of the processes involving the analyte and the MPR. [Display omitted] • Macroporous polymeric resin (MPR) is a tool that helps the analysis of food samples. • MPR allows adjustments of the adsorption and desorption processes. • Recovery of polyphenols and sugars has been shown to be efficient in complex matrices. • We hope to help researchers in choosing the ideal resin. [ABSTRACT FROM AUTHOR]

[Display omitted] • Furanoid glycosylated diterpenes (FGD) from coffee was analyzed by TLC-MS. • A methodology for extracting and detecting FGD was developed. • Four FGD were detected after concentration step in macroporous polymeric resin. • QuEChERS allowed less consumption of solvents and reagents at FGD analysis in coffee. Four furanoid glycosylated diterpenes (mascaroside I, mascaroside III, mascaroside IV and mascaroside V) were extracted from green grains of Coffea arabica after clean up steps with organic solvents (chloroform/acetone and 80 % ethanol) and concentrated with the aid of macroporous polymeric resins (XAD-2) in column. The identification of compounds has been extensively tested with the aid of hyphenated spectroscopic techniques, such as TLC-MS and ESI-HRMS. The methodology employed was shown to be efficient (81 % recovery after column) and robust (molecular ions of compounds with error <5 ppm), fitting the QuEChERS concept. [ABSTRACT FROM AUTHOR]