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Povzetek: Processors of dry-cured ham often face the challenge of prolonged storage of their products; thus, our aim was to investigate the effect of cold storage of vacuum-packed dry-cured ham Kraški pršut for different periods on various ham characteristics. Three groups of hams stored for either 1 month (control), 4 or 7 months were evaluated for physicochemical, rheological, and sensory properties, as well as volatile profile. The increase in storage time was associated with moisture balance in the ham, as evidenced by lighter colour, softer texture, and higher moisture content, particularly in the superficial (initially more dehydrated) semimembranosus muscle. The differences were most pronounced after 4 months of storage. Further storage for up to 7 months was not associated with any significant changes or degraded quality of the product, as evidenced by the absence of sensory differences between the tested groups. The identified volatile compounds indicate that lipid oxidation was the most important process during ham storage therefore these compounds can be used to distinguish between hams with different storage durations. It can be concluded that prolonged vacuum storage for up to 7 months at refrigeration temperatures does not deteriorate ham quality and even improves the homogeneity of the pieces.
Ključne besede: dry-cured ham, vacuum package, refrigerated storage
Objavljeno v DiRROS: 28.11.2024; Ogledov: 77; Prenosov: 1233
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Povzetek: Water scarcity, one of the most pressing challenges we face today, has developed for many reasons, including the increasing number of waterborne pollutants that affect the safety of the water environment. Waterborne human, animal and plant viruses represent huge health, environmental, and financial burden and thus it is important to efficiently inactivate them. Therefore, the main objective of this study was to construct a unique device combining plasma with supercavitation and to evaluate its efficiency for water decontamination with the emphasis on inactivation of viruses. High inactivation (>5 log10 PFU/mL) of bacteriophage MS2, a human enteric virus surrogate, was achieved after treatment of 0.43 L of recirculating water for up to 4 min. The key factors in the inactivation were short-lived reactive plasma species that damaged viral RNA. Water treated with plasma for a short time required for successful virus inactivation did not cause cytotoxic effects in the in vitro HepG2 cell model system or adverse effects on potato plant physiology. Therefore, the combined plasma-supercavitation device represents an environmentally-friendly technology that could provide contamination-free and safe water.
Ključne besede: cold plasma, hydrodynamic cavitation, supercavitation, virus inactivation, water decontamination, toxicity assays
Objavljeno v DiRROS: 28.11.2024; Ogledov: 102; Prenosov: 413
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Povzetek: Thermo-hydro-mechanical (THM) densification is a well-known wood modification procedure for improving the mechanical properties of low-density wood species, but its performance at elevated temperatures is not well understood. The objective of this study was to determine the bending behaviour of densified Scots pine at elevated temperatures. A total of 48 specimens (200 mm (longitudinonal) × 20 mm (radial) × 20 mm (tangential)) were tested to investigate the bending performance under constant temperatures at 25, 50, 125 and 175°C, respectively. It was found that the modulus of rupture (MOR) and modulus of elasticity (MOE) of both un-densified and densified pine decreased with increasing temperature. However, the densified wood exhibited more brittle shear failure but retained higher MOR and MOE than the untreated specimens treated at the same temperature level. In general, the results demonstrate that densification can be a potentially effective method to retain the mechanical properties of wood at elevated temperatures, thereby having a potential maintain the load-bearing capacity during and after fire.
Ključne besede: densification, wood, fire safety
Objavljeno v DiRROS: 28.11.2024; Ogledov: 77; Prenosov: 50
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Objavljeno v DiRROS: 27.11.2024; Ogledov: 60; Prenosov: 15
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Povzetek: Extensive sunken and bleeding cankers, shoot blight, and root rot symptoms on European beech (Fagus sylvatica L.) trees have recently been observed in several forest ecosystems in Italy and Slovenia. Since there is little information about the aetiology of these diseases and given the high economic and ecological relevance of these formations, a study was conducted from summer to autumn 2023 in ten sites to define the occurrence, distribution and impact of the main pathogens involved. A total of 116 symptomatic samples were collected and processed. Based on colony appearance, morphological features and DNA sequence data, six species belonging to the genera Botryosphaeria, Dothiorella, Diplodia, Neofusicoccum (fungi) and Phytophthora (oomycetes) were isolated and identified. Pathogenicity tests performed on potted European beech seedlings satisfied Koch postulates and highlighted that Diplodia corticola, Neofusicoccum parvum and Phytophthora plurivora are the main agents involved in the extensive decline affecting European beech ecosystems in Italy and Slovenia.
Ključne besede: Diplodia corticola, beech decline, invasive species, emerging diseases, co-infections
Objavljeno v DiRROS: 27.11.2024; Ogledov: 119; Prenosov: 744
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