Miyagi Kazuna

写真a

Title

Associate Professor

Researcher Number(JSPS Kakenhi)

50565752
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Current Affiliation Organization 【 display / non-display 】

  • Duty   University of the Ryukyus   Faculty of Agriculture   Bioscience and Biotechnology   Associate Professor  

  • Concurrently   University of the Ryukyus   Graduate School of Agriculture   Subtropical Agriculture   Associate Professor  

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University 【 display / non-display 】

  • 　
    -
    2004

    Nakamura Gakuen University   Faculty of Home Economics   Graduated

  • 　
    -
    2004

    Nakamura Gakuen University   Faculty of Home Economics   National registered dietitian speciality   Graduated

  • 2000.04
    -
    2004.03

    Nakamura Gakuen University   Faculty of Home Economics   National registered dietitian speciality   Graduated

  • 　
    -
    2009

    Nakamura Gakuen University   Health and Nutrition Sciences   Food Science   Graduated

  • 　
    -
    2009

    Nakamura Gakuen University   Graduate School of Nutritional Sciences   Graduated

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Graduate School 【 display / non-display 】

  • 2004.04
    -
    2006.03

    Nakamura Gakuen University Postgraduate course  Graduate School, Division of Nutrition  Food Science  Master's Course  Completed

  • 2006.04
    -
    2009.03

    Nakamura Gakuen University Postgraduate course  Graduate School, Division of Nutrition  Food Science  Doctor's Course  Completed

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Academic degree 【 display / non-display 】

  • Nakamura Gakuen University -  Doctor

  • Nakamura Gakuen University -  Master

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External Career 【 display / non-display 】

  • 2009.04
    -
    2010.01

    Nakamura Gakuen University, Faculty of Nutritional Science, Assistant  

  • 2010.02
    -
    2012.09

    Okinawa Prefectural Agricaltural Research Center, Researcher  

  • 2012.10
    　
    　

     

  • 2012.10
    -
    2017.03

    University of the Ryukyus, Faculty of Education, Assistant Professor  

  • 2017.04
    　
    　

     

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Affiliated academic organizations 【 display / non-display 】

  • 2004.04
    -
    Now
     

    Journal of The Japanese Society for Food Science and Technology 

  • 2007.04
    -
    Now
     

    Japan Association of Food Preservation Scientists 

  • 2011.04
    -
    Now
     

    Journal of Okinawa Agriculture 

  • 2014.04
    -
    Now
     

    Journal of Japan Society of Nutrition and Food Science 

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Research Interests 【 display / non-display 】

  • 食品機能

  • 栄養指導

  • 伝統的農産物（島ヤサイ）

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Research Areas 【 display / non-display 】

  • Life Science / Food sciences

  • Life Science / Food sciences

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Acquisition of a qualification 【 display / non-display 】

  • The functional foood consultant

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Research Theme 【 display / non-display 】

  • Explication of the storage special quality in traditional okinawan vegetables from Okinawa

  • Effect of modified atmosphere packaging on freshness retention of unripe green Shiikuwasha(Citrus depressa Hayata) fruit

  • Synephrine in Shiikuwasha: Analysis method, and its distribution in citrus varieties.

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Published Papers 【 display / non-display 】

  • Characteristics of vinegar extract from immature seedless Shiikuwasha(Citrus depressa Hayata, Nakamoto Seedless)

    Japan Association of Food Preservation Scientiste   45 ( 5 ) 215 - 219   2019.09 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

  • Respiration rate and contents of nutrient composition in major Okinawan traditional vegetables

    Naoto Hirose, Goki Maeda, Kazuna Miyagi, Koji Wada, Hideaki Ohta

    Journal of the Society of Tropical Resources Technologists     2018.03

    Type of publication: Research paper (scientific journal)

  • Quantification of Nicotianamine Content in Edible Plants : A Comparative Study under Fresh, Cold Storage, and Cooking Conditions

    Kensaku Takara, Shin Nagamine, Ryoya Ashimine, Kazuna Miyagi, Koji Wada

    Food preservation science   43 ( 3 ) 111 - 118   2017.05 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

  • Development of Vinegar Extract from the Waste Peels of Shiikuwasha

    Hirose Naoto, Maeda Goki, Onda Satoshi, Shoda Moriyuki, Miyagi Kazuna, Wada Koji, Ohta Hideaki

    Japanese Society for Food Science and Technology ( Japanese Society for Food Science and Technology )  64 ( 2 ) 81 - 89   2017 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    <p>In this study, vinegar extract was produced from the waste peels of Shiikuwasha, which contains characteristic ingredients such as polymethoxyflavones (PMFs) and is applicable for commercialization as a seasoning product. The results of this study are:</p><p>(1) After the seeds and segment membranes were removed from the residual substances from juice production, the peels were extracted using spirit vinegar without drying, resulting in a vinegar extract contained PMFs. Also, the vinegar extract was characterized by minimal amounts of limonin and low bitterness.</p><p>(2) A ratio of 20% (w/w) waste peels to 80% (w/w) spirit vinegar was employed, and the resultant vinegar extract contained 7.5mg/100mL nobiletin. The optimal extraction process was performed 4-5 times in ten seconds.</p><p>(3) During storage at ambient temperature, the PMFs content was stable, but monoterpenes decreased sharply and monoterpene alcohols decreased gradually.</p>

  • Synephrine in Shiikuwasha (Citrus depressa Hayata): change during fruit development, and its distribution in citrus varieties

    K. Miyagi, T. Fujise, N. Koga, K. Wada, M. Yano and H. Ohta

    Food Sci. Technol. Res. ( その他の出版社 )  15 ( 4 ) 389 - 394   2009 [ Peer Review Accepted ]

    Type of publication: Research paper (scientific journal)

    　View Summary

    シークワシャー果実中に存在するシネフリンについて、その分析法の検討とカンキツ品種における分布等を調査した結果、正確・迅速なシネフリン分析法を確立し、シネフリン生育中の変化及び品種間差を明らかにした。 シークワシャー果実中のシネフリン：分析条件の確立、時期別変化、カンキツ品種における分布。

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SDGs 【 display / non-display 】

  • 健康増進

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Social Activity 【 display / non-display 】

  • 2020.11
    　
    　

  • 2019.08
    　
    　

  • 2019.03
    　
    　

  • 2019.02
    　
    　

  • 2018.09
    　
    　

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Media Coverage 【 display / non-display 】

  • 島ヤサイのミラクルパワー ～島ヤサイの健康効果を活かした実践的取り組み～

    琉球大学  平成30年度琉球大学公開授業「キャリアデザインとジェンダーⅡ」  琉球大学  2018.12

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