Introduction
Mediterranean mussels (Mytilus galloprovincialis) may show marked differences in edible yield, nutritional composition and sensory profile according to farming area and season. Environmental conditions such as temperature, salinity, trophic status and phytoplankton availability may influence mussel composition and organoleptic quality, with potential implications for product valorisation and market differentiation (Orban et al., 2002; Yaghubi et al., 2021). Particular emphasis is placed on phytosterols, plant-derived sterols structurally similar to cholesterol that are known to reduce intestinal cholesterol absorption by competing with cholesterol during micellar incorporation (EFSA, 2008; EFSA, 2009). Their possible occurrence in mussels, likely linked to phytoplankton intake and local trophic conditions, represents an innovative and still poorly explored aspect in shellfish research, and may contribute to a more functional characterisation of the product (Phillips et al., 2012). The study therefore aims to compare mussels from different Italian production areas through an integrated nutritional and sensory approach, while also evaluating the possible effect of seasonality.
Materials and Methods
The study is starting at the end of May 2026. A first sampling campaign is planned for late spring-early summer, when mussels are expected to show favourable commercial yield, followed by a second campaign at the end of the production season using mussels of comparable size class. According to the current study design, mussels will be collected from up to five Italian production areas: La Spezia, Romagnola (Cesenatico), Sardinia (Oristano), Taranto and Scardovari. The edible portion will be analysed for proximate composition, fatty acid profile, amino acid composition and selected minerals, including selenium, iron, phosphorus, zinc, copper, sodium, potassium and magnesium. Specific attention will be devoted to sterol profiling, with targeted determination of cholesterol and phytosterols in order to explore whether mussels may also represent a source of non-cholesterol sterols of nutritional interest. Sensory characterisation will be carried out by Quantitative Descriptive Analysis QDA with a trained panel using descriptors covering appearance, odour, flavour and texture. Data analysis will compare samples according to production area and sampling season, and explore relationships between sterol profile, overall nutritional composition and sensory attributes.
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Figure 1. Schematic map of the Italian mussel origin areas included in the current study design.
Results and Discussion
Analyses are currently in progress; therefore, final results are not yet available. Based on the study rationale, we expect to observe area-related and seasonal differences in nutritional composition and specific sensory attributes, reflecting variability among Italian coastal production systems. In particular, differences are expected in edible yield, lipid fraction and mineral composition, as well as in descriptors associated with marine odour, sweetness, juiciness and firmness. Regarding the innovative component of the study, phytosterols are expected to be detected at variable levels among origins and sampling periods, potentially reflecting differences in phytoplankton-derived inputs and local trophic conditions. Their occurrence would be of particular interest because phytosterols are recognised for their ability to interfere with intestinal cholesterol absorption and are therefore associated with cholesterol-lowering potential. The integration of sterol data with nutritional and sensory results may help identify distinctive quality traits linked to origin and season, and support future strategies for product characterisation, communication and valorisation.
Acknowledgment
The authors acknowledge the collaborators and mussel producers involved in the sampling activities.
References
EFSA (2008) Plant sterols and blood cholesterol - scientific substantiation of a health claim related to plant sterols and lowering blood LDL-cholesterol concentrations. EFSA Journal. 781, 1-12.
EFSA (2009) Plant stanols and plant sterols and blood LDL-cholesterol concentrations. EFSA Journal. 1175, 1-9.
Orban, E. et al. (2002) Seasonal changes in meat content, condition index and chemical composition of mussels (*Mytilus galloprovincialis*) cultured in two different Italian sites. Food Chemistry. 77, 57-65.
Phillips, K.M. et al. (2012) Sterol composition of shellfish species commonly consumed in the United States. Food & Nutrition Research. 56, 19144.
Yaghubi, E. et al. (2021) Farmed mussels: A nutritive protein source, rich in omega-3 fatty acids, with a low environmental footprint. Nutrients. 13, 1124.