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An Approach of the Madeira Wine Chemistry
Madeira wine is a fortified Portuguese wine, which has a crucial impact on the Madeira Island economy. The particular properties of Madeira wine result from the unique and specific winemaking and ageing processes that promote the occurrence of chemical reactions among acids, sugars, alcohols, and polyphenols, which are important to the extraordinary quality of the wine. These chemical reactions contribute to the appearance of novel compounds and/or the transformation of others, consequently promoting changes in qualitative and quantitative volatile and non-volatile composition. The current review comprises an overview of Madeira wines related to volatile (e.g., terpenes, norisoprenoids, alcohols, esters, fatty acids) and non-volatile composition (e.g., polyphenols, organic acids, amino acids, biogenic amines, and metals). Moreover, types of aroma compounds, the contribution of volatile organic compounds (VOCs) to the overall Madeira wine aroma, the change of their content during the ageing process, as well as the establishment of the potential ageing markers will also be reviewed. The viability of several analytical methods (e.g., gas chromatography-mass spectrometry (GC-MS), two-dimensional gas chromatography and time-of-flight mass spectrometry (GC×GC-ToFMS)) combined with chemometrics tools (e.g., partial least squares regression (PLS-R), partial least squares discriminant analysis (PLS-DA) was investigated to establish potential ageing markers to guarantee the Madeira wine authenticity. Acetals, furanic compounds, and lactones are the chemical families most commonly related with the ageing process.
Journal Article
A new species of Sphingonotus from the Salvage Islands with an updated list of taxa from the Macaronesian Islands
A new species of the genus Sphingonotus Fieber, 1852 is described, Sphingonotus (Sphingonotus) axeli sp. nov. from the Salvage Islands. The synonymy of Sphingonotus (Neosphingonotus) asper (Brullé, 1840) with Sphingonotus (Neosphingonotus) pachecoi (Bolívar, 1908) is established and an updated list of currently known taxa from the other Macaronesian Islands is provided. Keywords: Madeira, Canary Islands, Azores, Selvagem Grande, synonymy
Journal Article
Green Extraction Techniques as Advanced Sample Preparation Approaches in Biological, Food, and Environmental Matrices: A Review
Green extraction techniques (GreETs) emerged in the last decade as greener and sustainable alternatives to classical sample preparation procedures aiming to improve the selectivity and sensitivity of analytical methods, simultaneously reducing the deleterious side effects of classical extraction techniques (CETs) for both the operator and the environment. The implementation of improved processes that overcome the main constraints of classical methods in terms of efficiency and ability to minimize or eliminate the use and generation of harmful substances will promote more efficient use of energy and resources in close association with the principles supporting the concept of green chemistry. The current review aims to update the state of the art of some cutting-edge GreETs developed and implemented in recent years focusing on the improvement of the main analytical features, practical aspects, and relevant applications in the biological, food, and environmental fields. Approaches to improve and accelerate the extraction efficiency and to lower solvent consumption, including sorbent-based techniques, such as solid-phase microextraction (SPME) and fabric-phase sorbent extraction (FPSE), and solvent-based techniques (μQuEChERS; micro quick, easy, cheap, effective, rugged, and safe), ultrasound-assisted extraction (UAE), and microwave-assisted extraction (MAE), in addition to supercritical fluid extraction (SFE) and pressurized solvent extraction (PSE), are highlighted.
Journal Article
Plant-Derived Terpenoids: A Plethora of Bioactive Compounds with Several Health Functions and Industrial Applications—A Comprehensive Overview
Terpenoids are a large class of natural secondary plant metabolites which are highly diverse in structure, formed from isoprene units (C-5), associated with a wide range of biological properties, including antioxidant, antimicrobial, anti-inflammatory, antiallergic, anticancer, antimetastatic, antiangiogenesis, and apoptosis induction, and are considered for potential application in the food, cosmetics, pharmaceutical, and medical industries. In plants, terpenoids exert a variety of basic functions in growth and development. This review gives an overview, highlighting the current knowledge of terpenoids and recent advances in our understanding of the organization, regulation, and diversification of core and specialized terpenoid metabolic pathways and addressing the most important functions of volatile and non-volatile specialized terpenoid metabolites in plants. A comprehensive description of different aspects of plant-derived terpenoids as a sustainable source of bioactive compounds, their biosynthetic pathway, the several biological properties attributed to these secondary metabolites associated with health-promoting effects, and their potential industrial applications in several fields will be provided, and emerging and green extraction methods will also be discussed. In addition, future research perspectives within this framework will be highlighted. Literature selection was carried out using the National Library of Medicine, PubMed, and international reference data for the period from 2010 to 2024 using the keyword “terpenoids”. A total of 177,633 published papers were found, of which 196 original and review papers were included in this review according to the criteria of their scientific reliability, their completeness, and their relevance to the theme considered.
Journal Article
Cutaneous manifestations associated with SARS CoV-2: an emerging topic in a pandemic era
A 70-year-old man was admitted to our COVID-19 ward with thoracalgia, productive mucus cough, fatigue and erythematous–violaceous macules on the inner side of feet and interdigital regions. The patient was started on oxygen and dexamethasone. On the day of discharge, he maintained the skin changes despite the resolution of COVID-19 symptoms. A 57-year-old woman initially presented with diffuse urticarial rash on the cervical and chest region. Oral cetirizine was started, and pruritus improved. Thirty days after the discharge, the patient maintained the rash, but without pruritus. A 49-year old man was admitted with thoracalgia, shortness of breath, dry cough and urticarial rash on the cervical and chest region. The patient was treated with cetirizine. The pruritus improved, and 5 days after discharge, the urticarial areas completely disappeared
Journal Article
Bioactive Compounds and Antioxidant Activity from Spent Coffee Grounds as a Powerful Approach for Its Valorization
Coffee is one of the world’s most popular beverages, and its consumption generates copious amounts of waste. The most relevant by-product of the coffee industry is the spent coffee grounds, with 6 million tons being produced worldwide per year. Although generally treated as waste, spent coffee grounds are a rich source of several bioactive compounds with applications in diverse industrial fields. The present work aimed at the analysis of spent coffee grounds from different geographical origins (Guatemala, Colombia, Brazil, Timor, and Ethiopia) for the identification of bioactive compounds with industrial interest. For this purpose, the identification and quantification of the bioactive compounds responsible for the antioxidant activity attributed to the spent coffee grounds were attempted using miniaturized solid-phase extraction (µ-SPEed), combined with ultrahigh-performance liquid chromatography with photodiode array detection (UHPLC-PDA). After validation of the µ-SPEed/UHPLC-PDA method, this allowed us to conclude that caffeine and 5-caffeoylquinic acid (5-CQA) are the most abundant bioactive compounds in all samples studied. The total phenolic content (TPC) and antioxidant activity are highest in Brazilian samples. The results obtained show that spent coffee grounds are a rich source of bioactive compounds, supporting its bioprospection based on the circular economy concept closing the loop of the coffee value chain, toward the valorization of coffee by-products.
Journal Article
Pre-Emptively Managing Overtourism by Promoting Rural Tourism in Low-Density Areas: Lessons from Madeira
Overtourism refers not only to situations in which carrying capacity levels have been exceeded, but also to those in which tourists and residents share negative feelings of discomfort and other emotions, loss of quality of life and unpleasant experiences in their activities of daily life. The growing number of places struggling with the problem of overtourism suggests that brand new approaches are required to minimize the effects of excessive tourism. However, the impacts of overtourism are place-specific and a one-size-fits-all approach is inappropriate. Many destinations still have a considerable margin to manoeuvre but are nonetheless heading towards increasingly unsustainable levels of tourists per square kilometer. Such regions have time to take some pre-emptive measures based on principles of sustainable development using greener and energy-saving technologies. Over the past few decades, degrowth has arisen as an unorthodox approach based on principles of fairness and social and environmental justice. In certain areas, such as island economies, the economic dynamics remain largely dependent on the tourism sector, which forces the local actors to think and act differently. In this study, we analyze the strategies employed by Madeira to counter the negative effects of oversaturation in a pre-emptive way. The findings of this case study, based on the data at the county level, are enhanced by a panel data analysis of a number of relevant explanatory variables explaining the dispersion of tourists to the rural hinterland. The results suggest that the development of the rural hinterland has proven capable of exerting a progressively positive influence well beyond the borders of the rural hinterland by accommodating a growing share of the increasing numbers of tourists welcomed in the region in the 2002–2019 period, at the expense of the main capital city. This study confirms the importance and potential of the development of the rural hinterland to tackle overtourism in the main tourism areas. In terms of recommendations, it is suggested that local operators and policy-makers must develop efforts to research new ways to adopt energy-saving projects and develop tourisms products that incorporate eco-friendly behaviors.
Journal Article
Sea urchin Diadema africanum mass mortality in the subtropical eastern Atlantic
A widespread mass mortality event of the sea urchin Diadema africanum was detected in the subtropical eastern Atlantic, extending from Madeira to the Canary Islands, covering a straight-line distance of >400 km. This is the first disease-related die-off of a diadematid documented in the eastern Atlantic Ocean. Diseased individuals showed deterioration of the epidermis and water-vascular system, resulting in epidermal necrosis and release of spines. Despite some spatial heterogeneity in disease incidence at the study sites, there was a 65% overall reduction in urchin abundance after the mortality event compared to numbers pre-mortality. However, the reduction in urchin numbers did not compromise the species’ reproductive success; the settlement peak following the mortality event was of a similar magnitude to that in prior years. Bacterial isolation and cul ture techniques, and subsequent laboratory in fection experiments, strongly suggested that Vibrio alginolyticus was involved in the disease. We hypo thesize that the mass mortality event developed due to anomalously high seawater temperatures recorded in the 2 studied archipelagos and that warmer temperatures enabled infection of D. africanum by waterborne pathogenic bacteria. Fluctuations in urchin populations are key in determining the structure and functioning of benthic ecosystems: under the current seawater warming scenario, disease may result in more frequent phase shifts, aiding the persistence of macroalgae.
Journal Article