CO2 processing and hydration of fruit and vegetable tissues by clathrate hydrate formation

卷:205

Takeya, Satoshi ; Nakano, Kohei ; Thammawong, Manasikan ; Umeda, Hiroki ; Yoneyama, Akio ; Takeda, Tohoru ; Hyodo, Kazuyuki ; Matsuo, Seiji

Natl Inst Adv Ind Sci & Technol

关键词: CO2 hydrate;    Diffraction enhanced imaging;    Food preservation;    Gas storage;    Phase-contrast imaging;   

DOI  :  10.1016/j.foodchem.2016.03.010

学科分类：食品科学和技术

【 摘 要 】

CO2 hydrate can be used to preserve fresh fruits and vegetables, and its application could contribute to the processing of carbonated frozen food. We investigated water transformation in the frozen tissue of fresh grape samples upon CO2 treatment at 2-3 MPa and 3 degrees C for up to 46 h. Frozen fresh bean, radish, eggplant and cucumber samples were also investigated for comparison. X-ray diffraction indicated that after undergoing CO2 treatment for several hours, structure I CO2 hydrate formed within the grape tissue. Phase-contrast X-ray imaging using the diffraction-enhanced imaging technique revealed the presence of CO2 hydrate within the intercellular spaces of these tissues. The carbonated produce became effervescent because of the dissociation of CO2 hydrate through the intercellular space, especially above the melting point of ice. In addition, suppressed metabolic activity resulting from CO2 hydrate formation, which inhibits water and nutrient transport through intercellular space, can be expected. (C) 2016 Elsevier Ltd. All rights reserved.