Improving the antioxidant functionality of Citrus junos Tanaka (yuzu) fruit juice by underwater shockwave pretreatment.
Citrus junos Tanaka (yuzu) has a strong characteristic aroma, and hence, yuzu juice is used in a number of Japanese foods. We herein evaluated the functional compounds of yuzu juice to investigate whether underwater shockwave pretreatment affects its functionality. Employing the shockwave pretreatment at an increased discharge and energy of 3.5kV and 4.9kJ, respectively, resulted in an increase in the flavanone glycoside content and oxygen radical absorbance capacity (ORAC). The ORAC value of yuzu juice cultivated in Rikuzentakata increased approximately 1.7 times upon underwater shockwave pretreatment. The treatment method proposed herein exhibited reliable and good performance for the extraction of functional and antioxidant chemicals in yuzu fruits, and was comparable with traditional squeezing methods. The high applicability and reliability of this technique for improving the antioxidant functionality of yuzu fruit juice was demonstrated, confirming the potential for application to a wide range of food extraction processes.
Science and Technology Division, National Institute of Technology, Okinawa College, 905 Henoko, Nago City, Okinawa 905-2192, Japan. Electronic address: kuraya@okinawa-ct.ac.jp.
Eisuke
E
Kuraya
Science and Technology Division, National Institute of Technology, Okinawa College, 905 Henoko, Nago City, Okinawa 905-2192, Japan. Electronic address: shina.nakada@gmail.com.
Shina
S
Nakada
Science and Technology Division, National Institute of Technology, Okinawa College, 905 Henoko, Nago City, Okinawa 905-2192, Japan. Electronic address: touyama@okinawa-ct.ac.jp.
Akiko
A
Touyama
National Institute of Technology, Okinawa College, 905 Henoko, Nago City, Okinawa 905-2192, Japan. Electronic address: itoh_lab@okinawa-ct.ac.jp.
Shigeru
S
Itoh
D000975:Antioxidants / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D002957:Citrus / Q000737:chemistry* / Q000528:radiation effects; D005511:Food Handling; D005638:Fruit / Q000737:chemistry* / Q000528:radiation effects; D000067030:Fruit and Vegetable Juices / Q000528:radiation effects*; D019220:High-Energy Shock Waves; D010936:Plant Extracts / Q000032:analysis* / Q000737:chemistry / Q000528:radiation effects; D014867:Water / Q000737:chemistry*
D000975:Antioxidants; D010936:Plant Extracts; D014867:Water
Antioxidant activity; Citrus junos Tanaka (yuzu) juice; Oxygen radical absorbance capacity; Underwater shockwave