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Department of Horticulture & Landscape Architecture

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https://hdl.handle.net/10217/100453
These digital collections include theses, dissertations, faculty publications, and student publications from the Department of Horticulture & Landscape Architecture. Due to departmental name changes, materials from the following historical departments are also included here: Recreation Resources; Natural Resource Recreation and Tourism; Horticulture.

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Browsing Department of Horticulture & Landscape Architecture by Subject "antioxidants"

Now showing 1 - 3 of 3
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    Antioxidant properties of date palm (Phoenix dactylifera L.) cultivars
    (Colorado State University. Libraries, 2008) Al-Turki, Saleh Mobarak, author; Stushnoff, Cecil, advisor
    The fruit and pits of date palm (Phoenix dactylifera L.) cultivars from the United States (US) and Saudi Arabia (SA) were analyzed for their total phenolic contents and antioxidant activity for two years. The amount of total phenolic compounds and antioxidant activity in all date fruit and pit cultivars tested in this study, at the Tamar stage, were significantly different. Total phenolic contents of fruit ranged from 507.03 (Gur SA) to 225.02 (Medjool US) mg Gallic Acid Equivalents (GAE)/100g FW and antioxidant activities ranged from 1400.14 to 228.06 μmole TEAC/100g of fresh weight (ABTS) in Deglet Noor US and Khalasa US respectively. DPPH of fruit ranged from 117.75 to 165.42 μmole TEAC/100g of fresh weight in Deglet Noor (US) and Khalasa (US) respectively. The pit, which is about 12% of date fruit weight, ranged from 66.68 (Hilali US) to 14.51 (Amir Hajj US) mg GAE/g DW total phenolics. ABTS ranged from 679.01 to 45.83 µmole TEAC/1g of dry weight in Hilali US and Hayany (US) respectively. DPPH ranged from 15.94 to 3.92 μmole TEAC/g of dry weight in Sukari (SA) and Khalasa (SA) respectively. A significant association between the total phenolic content and antioxidant activities was found in both years with ABTS and DPPH. Moreover, there was a strong relationship between measurement of antioxidant capacity by ABTS and DPPH in both years in fruit and pits. Fruit of one cultivar, Khalasa, was available both years from the (US) and (SA). Phenolic content, ABTS and DPPH radical scavenging capacity of fruit and pits differed in their antioxidant activity due to different location and other environmental factors. Fruit or pit (SA) cultivar was significantly higher than the (US) cultivar over all treatments. Deglet Noor (US) fruit which makes up about 90% of California's date crop was found to be the best over all cultivars of those tested in this study. Hilali (US) was the best antioxidant source of date pit cultivars in (US), whereas, Sukari (SA) was the best antioxidant source of pits in (SA). Thus, this research demonstrates the potential of date fruit and pits as antioxidant functional food ingredients.
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    Comparative physiological and proteomic analysis reveal distinct regulation of peach skin quality traits by altitude
    (Colorado State University. Libraries, 2016-11-10) Karagiannis, Evangelos, author; Tanou, Georgia, author; Samiotaki, Martina, author; Michailidis, Michail, author; Diamantidis, Grigorios, author; Minas, Ioannis, author; Molassiotis, Athanassios, author
    The role of environment in fruit physiology has been established; however, knowledge regarding the effect of altitude in fruit quality traits is still lacking. Here, skin tissue quality characters were analyzed in peach fruit (cv. June Gold), harvested in 16 orchards located in low (71.5 m mean), or high (495 m mean) altitudes sites. Data indicated that soluble solids concentration and fruit firmness at commercial harvest stage were unaffected by altitude. Peach grown at high-altitude environment displayed higher levels of pigmentation and specific antioxidant-related activity in their skin at the commercial harvest stage. Skin extracts from distinct developmental stages and growing altitudes exhibited different antioxidant ability against DNA strand-scission. The effects of altitude on skin tissue were further studied using a proteomic approach. Protein expression analysis of the mature fruits depicted altered expression of 42 proteins that are mainly involved in the metabolic pathways of defense, primary metabolism, destination/storage and energy. The majority of these proteins were up-regulated at the low-altitude region. High-altitude environment increased the accumulation of several proteins, including chaperone ClpC, chaperone ClpB, pyruvate dehydrogenase E1, TCP domain class transcription factor, and lipoxygenase. We also discuss the altitude-affected protein variations, taking into account their potential role in peach ripening process. This study provides the first characterization of the peach skin proteome and helps to improve our understanding of peach's response to altitude.
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    Inhibition of HT-29 colon cancer cell cultures by extracts from biodiverse germplasm sources of Solanum tuberosum L.
    (Colorado State University. Libraries, 2012) Zuber, Tatiana, author; Stushnoff, Cecil, advisor; Holm, David G., committee member; Byrne, Patrick F., committee member; Thompson, Henry J., committee member
    To view the abstract, please see the full text of the document.