Artículos de revista DTA - ETS Aldizkari artikuluak

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Browsing Artículos de revista DTA - ETS Aldizkari artikuluak by Subject "Cold storage"

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    PublicationOpen Access
    Andean blackberries (Rubus glaucus Benth) quality as affected by harvest maturity and storage conditions
    (Elsevier, 2017) Horvitz Szoichet, Sandra Susana; Chanaguano, Diana; Arozarena Martinicorena, Íñigo; Tecnología de Alimentos; Elikagaien Teknologia
    Maturity stage at harvest and storage conditions are critical factors determining fruit postharvest quality. Physicochemical (fruit size, mass loss, color, firmness, pH, total soluble solids, titratable acidity), microbiological (total aerobic mesophiles, psychrotrophes, and yeasts and molds) and sensory quality of Andean blackberries harvested at two maturity stages and stored under room (18 ± 2 °C) and cold storage (8 ± 1 °C) was studied. Total phenolic compounds, anthocyanins and organic acids content, and antioxidant activity were also evaluated. The more mature fruit was classified as “big”, according to the Ecuadorian Standard and showed lower acidity and higher total soluble solids, anthocyanins content and sensory scores compared with the fruit harvested earlier, whilst maturity at harvest did not affect the microbial counts of any of the groups studied. Cold storage was effective in delaying weight loss, softening and microbial growth and also in maintaining a better sensory quality of the blackberries. What’s more, under refrigeration it was possible to extend the shelf-life of the fruit to up to 8 d. The main limiting factors for shelf-life were microbial growth and loss of firmness at room storage and cold storage, respectively. Based on these results, it would be advisable to harvest the fruit at maturity stage 5 in order to achieve an appropriate fruit size, a high anthocyanin concentration, a better sugars/ acids equilibrium, and a better sensory quality and the fruit should be maintained under refrigerated storage.
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    PublicationOpen Access
    Efecto del estado de madurez y atmósferas modificadas sobre la calidad de cerezas cv. Sweetheart
    (Universidad Nacional de Cuyo, 2004) Horvitz Szoichet, Sandra Susana; Yommi, Alejandra; López Camelo, Andrés; Godoy, Carlos; Tecnología de Alimentos; Elikagaien Teknologia
    Se estudió el efecto de cosechar cerezas en dos estados de madurez, así como el uso de atmósferas modificadas empleando PBD y PVC, sobre la calidad de fruta almacenada a 0 °C durante 21 y 42 días, respectivamente. La calidad fue evaluada en base a pérdida de peso (%), color (ángulo hue), firmeza, contenido de sólidos solubles, aspecto de los pedicelos y presencia de podredumbres. La fruta cosechada más madura presentó color, sólidos solubles y firmeza adecuados durante los 21 días a 0 °C, pero el almacenamiento estuvo limitado por la deshidratación de los pedicelos, que mantuvieron aspecto comercial sólo durante una semana. Para ambos estados de madurez, la pérdida de peso fue importante y se registró aumento del contenido de sólidos solubles y firmeza. Sin embargo, la fruta cosechada más inmadura no alcanzó en ningún momento la coloración ni contenido de azúcares de la fruta cosechada en estado de madurez más avanzado. Mediante el uso de las bolsas PBD se logró minimizar la deshidratación y mantener las características organolépticas de la fruta, así como un alto porcentaje de pedicelos con buen aspecto y color durante los 42 días de conservación en frío. El uso de PVC se vio limitado por el deterioro de los pedicelos que afectó alrededor del 50 % de la fruta analizada al término de la primera semana.
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    PublicationOpen Access
    Effects of ozone and chlorine postharvest treatments on quality of fresh-cut red bell peppers
    (Oxford University Press, 2012-06-20) Horvitz Szoichet, Sandra Susana; Cantalejo Díez, María Jesús; Tecnología de Alimentos; Elikagaien Teknologia; Institute on Innovation and Sustainable Development in Food Chain - ISFOOD
    The effects of chlorine (200 μL L¯¹), ozonated water (1 μL L¯¹) and gaseous ozone (0.7 μL L¯¹) on physicochemical attributes and microbial quality of minimally processed red bell peppers were studied. In all the experiments, O2 continuously decreased and CO2 concentration increased, the pH augmented and a significant softening was observed in all the fruits. By day 14, L* values decreased in all the fruits, with the greatest changes found in the chlorinated samples (approximately 12 units). Peppers treated with the aqueous solutions showed greater changes in the quality attributes with increasing washing times and especially when chlorine was used. The exposure for three min to gaseous O3 reduced the mesophiles, psychrotrophes and fungal populations of the fresh-cut peppers in 2.5, 3.3 and 1.8 log units, respectively. Combined with modified atmosphere, this could be an appropriate method to maintain the quality and extend the storage period of minimally processed red bell peppers.