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<p>To investigate the enhancement effect of ultrasound on moisture transfer during far-infrared radiation combined vacuum drying, channel catfish surimi was used as model material, and ultrasound-assisted drying experiments coupled with two-dimensional correlation spectroscopy analysis were conducted. The effects of different ultrasonic powers on drying characteristics, water migration and molecular vibrations were evaluated. The results showed that the application of 30&#xa0;W and 60&#xa0;W ultrasound powers could shorten drying times by 10% and 30%, respectively, compared with that without ultrasound. The Weibull model effectively described the drying kinetics (<i>R²</i> &gt; 0.996), and the decrease in the scale parameter indicated that ultrasound significantly accelerated the drying process. Scanning electron microscopy revealed that ultrasound application promoted the formation of micro-pores, which facilitated water diffusion. The results of low-field nuclear magnetic resonance clarified that free water content increased slightly and then decreased until completely removed, semi-bound water content decreased first and then stabilized, and bound water content remained basically unchanged. Near-infrared spectroscopy demonstrated significant changes in the absorption bands at 960, 1210, 1390, 1590, and 1680&#xa0;nm during drying. These changes corresponded to the vibration characteristics of O-H, C-H and N-H groups. The results of two-dimensional correlation spectroscopy and moving window analysis illustrated that the response order of surimi during drying was: O-H→N-H→C-H. According to the near-infrared and low-nuclear magnetic heterogeneous correlation spectra, it could be seen that at 970, 1210, and 1390&#xa0;nm, the change sequence of water-related functional groups in surimi was: double frequency O-H &gt; combined frequency O-H &gt; double frequency C-H. In summary, ultrasound application during far-infrared radiation vacuum drying could improve mass transfer efficiency and molecular structure changes.</p>

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Two-dimensional correlation spectroscopy analysis on moisture changes of channel catfish surimi during ultrasound enhanced far-infrared radiation combined vacuum drying

  • 期刊论文

  • 发表日期：

    2026年5月6日

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  • Keyu Qian,
  • Han Wu,
  • Linxin Li,
  • Anguo Xie,
  • Yunhong Liu

摘要

To investigate the enhancement effect of ultrasound on moisture transfer during far-infrared radiation combined vacuum drying, channel catfish surimi was used as model material, and ultrasound-assisted drying experiments coupled with two-dimensional correlation spectroscopy analysis were conducted. The effects of different ultrasonic powers on drying characteristics, water migration and molecular vibrations were evaluated. The results showed that the application of 30 W and 60 W ultrasound powers could shorten drying times by 10% and 30%, respectively, compared with that without ultrasound. The Weibull model effectively described the drying kinetics (R² > 0.996), and the decrease in the scale parameter indicated that ultrasound significantly accelerated the drying process. Scanning electron microscopy revealed that ultrasound application promoted the formation of micro-pores, which facilitated water diffusion. The results of low-field nuclear magnetic resonance clarified that free water content increased slightly and then decreased until completely removed, semi-bound water content decreased first and then stabilized, and bound water content remained basically unchanged. Near-infrared spectroscopy demonstrated significant changes in the absorption bands at 960, 1210, 1390, 1590, and 1680 nm during drying. These changes corresponded to the vibration characteristics of O-H, C-H and N-H groups. The results of two-dimensional correlation spectroscopy and moving window analysis illustrated that the response order of surimi during drying was: O-H→N-H→C-H. According to the near-infrared and low-nuclear magnetic heterogeneous correlation spectra, it could be seen that at 970, 1210, and 1390 nm, the change sequence of water-related functional groups in surimi was: double frequency O-H > combined frequency O-H > double frequency C-H. In summary, ultrasound application during far-infrared radiation vacuum drying could improve mass transfer efficiency and molecular structure changes.