Browsing by Subject "Short chain fatty acids"

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    Raspberry dietary fibre: Chemical properties, functional evaluation and prebiotic in vitro effect
    (2020-09-09) Periago, María Jesús; Baenas, Nieves; Núñez-Gómez, Vanesa; Navarro-González, Inmaculada; Sánchez-Martínez, Lorena; García-Alonso, Javier; González-Barrio, Rocío; Tecnología de Alimentos, Nutrición y Bromatología
    Raspberries have high content of antioxidants; however, there is a lack of information about the functional composition of their dietary fibre. In this work, the total dietary fibre and its soluble and insoluble fractions were analysed for extractable and hydrolysable (poly)phenols, non-starch polysaccharides and functional properties with physiological effects and health implications (fat and water retention and swelling capacity, glucose diffusion retardation index, osmotic pressure and antioxidant capacity). Additionally, their prebiotic effect was assessed by an in vitro fermentation model by the analysis of short chain fatty acids. Results show that raspberry fibre contained mainly hydrolysable (poly)phenols; insoluble dietary fibre was the fraction richest in these compounds and also had the highest antioxidant and fat retention capacity, whereas soluble dietary fibre underwent greater hydration. The in vitro fermentations showed that (poly)phenols were responsible to a great extent for the raspberry prebiotic-like effect, in comparison with the fibre fractions. The results confirm that raspberry dietary fibre fractions could be used as functional and prebiotic ingredients for the development of food products with enhanced physical and nutritional properties.
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    Resistant dextrin protects against pathological bone loss in ovariectomized rats and inhibits RANKL-induced osteoclastogenesis
    (Universidad de Murcia, Departamento de Biologia Celular e Histiologia, 2022) Wang, Hongwei; Bu, Xiaojie; Chen, Fulian; Wang, Yan; Chen, Yao
    Background. Osteoporosis is a common disease in postmenopausal women characterized by systemic bone mass loss, microstructure fragility and increased incidence of fractures. Resistant dextrin (RD) is a soluble fiber with beneficial metabolic effects. However, the beneficial effect of RD in osteoporosis remains to be determined. Methods. In this study, we investigated the effect of dietary RD supplement on osteoporosis in ovariectomized (OVX) rats. Both the control (sham) and OVX group rats were gavaged with RD (10 g/kg/d) or equal amount of saline for 12 weeks, and histological and biomechanical analyses were conducted to evaluate bone microstructure and strength. Furthermore, we also evaluated the effects of RD on osteoclastogenesis in bone marrow macrophages (BMMs) by detecting the expression of osteoclast-related genes using qRT-PCR and Western blot analysis. Results. The results showed that in OVX rats the bone strength and microstructure characteristics were significantly improved with RD supplement for 12 weeks. Additionally, the mRNA and protein expression of osteoclast markers, such as CTSK, NF-κB and NFATC1, were significantly down-regulated in BMMs isolated from RD supplement group. RD also suppressed RANKL-induced osteoclastogenesis in BMMs. Conclusion. These findings suggest that RD ameliorates osteoporosis in OVX rats by inhibiting osteoclast differentiation. RD suppresses RANKLinduced osteoclastogenesis possibly through modulating Akt and NF-κB signaling pathways. These data indicate that a dietary supplement of RD might serve as an intervention strategy for menopausal osteoporosis