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Nieto Martínez, Gema

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Nieto Martínez, Gema
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Universidad de Murcia. Departamento de Tecnología de los Alimentos,Nutrición y Bromatología
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    Plant derived ingredients rich in nitrates or phenolics for protection of pork against protein oxidation
    (Elsevier, 2019-11-21) Martínez Zamora, Lorena; Jongberg, Sisse; Ros Berruezo, Gaspar; Skibsted, Leif H.; Nieto Martínez, Gema; Tecnología de Alimentos, Nutrición y Bromatología
    A pork model system containg phenolic extracts (citrus, rosemary, and acerola), traditional Spanish food ingredients (paprika, garlic, and oregano), or natural nitrate sources (beet, lettuce, arugula, spinach, chard, celery, and watercress) were oxidized by an hydrophilic (OXHydro, 2,2′-azobis(2-amidinopropane)-dihydrochloride; AAPH) or lipophilic (OXLip, 2,2′-azobis(2,4-dimethylvaleronitrile; AMVN) radical initiator. Citrus as well as lettuce and spinach protected almost fully against protein thiol loss and showed efficient radical scavenging activity as determined by ESR spectroscopy in both oxidizing systems. Rosemary was an efficient radical scavenger in both systems, but behaved as a prooxidant on thiols in the OXHydro system. Acerola was also found to be prooxidative as determined by increased radical signal intensity especially in the OXLip system, assigned to high concentration of ascorbate in the extract. Natural nitrate sources, especially lettuce and spinach, are accordingly potential substitutes for synthetic phenolic antioxidants protecting against protein thiol oxidation and radical formation in pork.
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    Substitution of synthetic nitrates and antioxidants by spices, fruits and vegetables in Clean label Spanish chorizo
    (Elsevier, 2020-10-27) Martínez Zamora, Lorena; Peñalver Miras, Rocío; Ros Berruezo, Gaspar; Nieto Martínez, Gema; Tecnología de Alimentos, Nutrición y Bromatología
    Natural extracts obtained from fruits and vegetables processing are important sources of phenolic compounds and nitrates, with excellent antioxidant and antimicrobial properties. The aim of this study was to elaborate a Clean label dry-cured meat product (Spanish “chorizo”) using Mediterranean Diet ingredients (Citrus, Acerola, Rosemary, Paprika, Garlic, Oregano, Lettuce + Arugula + Watercress, Spinach + Celery, Chard + Beet). For that, a self-life study for 150 days was carried out, when physical-chemical (colour, pH, aw, thiol loss, volatile compounds profile), microbiological, and organoleptic changes were determined. The combination of citrus extracts and leafy green vegetables halved the hexanal and nonanal content for 150 days. In addition, this change did not affect to the sensory properties of the product, which obtained the highest acceptance avoiding the oxidative damage (colour, volatile compounds release, thiol loss) and the microbiological growth. Nevertheless, rosemary extract incorporation altered sensory quality, unless it also avoided protein and lipid oxidation, as well as microbiological growth. Otherwise, Control sample elaborated with synthetic sources of nitrates and nitrites showed a lower sensory quality due to the increased hardness, protein oxidation, hexanal, and nonanal concentrations, related to lipid oxidation, and hence, to rancid flavour apparition.
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    Effect of natural extracts obtained from food industry by-products on nutritional quality and shelf life of chicken nuggets enriched with organic Zn and Se provided in broiler diet
    (Elsevier, 2020-01-22) Lorena Martínez Zamora; Ros Berruezo, Gaspar; Nieto Martínez, Gema; Martínez Zamora, Lorena; Tecnología de Alimentos, Nutrición y Bromatología
    This study investigated the influence of an organic mineral-supplemented broiler diet on the quality of nuggets. The resulting chicken nuggets were enriched with inorganic and organic forms of Zn and Se. The nuggets were processed by incorporating extracts from food industry by-products (rosemary [RH and RL], hydroxytyrosol [HYT], pomegranate [P], grape [GS], and Harpagophytum [H]). The physiochemical, microbiological, and sensory characteristics of the chicken nuggets were evaluated over a 12-month period of frozen storage. The addition of natural extracts did not affect the pH, proximate composition, or color (CIELab) of the nuggets among samples. However, significative differences were found between month of analysis (range from pH 6.16 to 6.63; luminosity from 62.51 to 84.74; redness from 0.16 to 7.14; and yellowness from 10.80 to 33.77). In addition, the combination of phenolic compounds with Zn and Se retarded microbial growth and reduced protein and lipid oxidation, thus maintaining the sensory quality and extending the shelf life of this product. For instance, the combination of RL 1 GS reduced in 75% the microbiological growth regarding the control sample (C), while samples that incorporated RH 1 P or HYT 1 P 1 H presented 50% less than C. In addition, upon only incorporating organic minerals Zn and Se, microbiological deterioration is reduced in 15%. This mix was significantly effective at reducing the oxidative reactions of lipids and proteins by 40% and 50%, as measured after 9 and 12 mo of frozen storage, respectively. The addition of the natural extracts and Zn and Se did not adversely affect the acceptability of the meat product.
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