Department Pure and Applied Physics, Faculty of Engineering Science, Kansai University, Osaka 564-8680, Japan.
The Sonochemistry Centre, Faculty of Health and Life Sciences, Coventry University, Coventry CV1 5FB, United Kingdom.
Ultrason Sonochem. 2015 May;24:165-71. doi: 10.1016/j.ultsonch.2014.11.002. Epub 2014 Nov 13.
In this work the effect of ultrasonic waves on suspensions of Chlamydomonas concordia and Dunaliella salina have been investigated at frequencies of 20, 585, 864 and 1146 kHz and at different acoustic powers. Results showed that the reduction in algal numbers was dependent on both frequency and acoustic power. The order of efficiency of the ultrasonic disruption of C. concordia at different frequencies was 20 < 580 < 864 < 1146 kHz, and for D. salina was 20< 580 ≅ 864 ⩽ 1146 kHz. It is clear that high-frequency sonication is more effective than conventional low-frequency sonication for the disruption of cells for both species. Results showed that suitable disruption frequencies for each algae were associated with the mechanical properties of the cell. The frequency dependence of the efficiency of algae disruption on the mechanical resonances of both the algae cell is discussed in terms of bubble oscillation in an ultrasonic field.
本工作研究了在 20、585、864 和 1146 kHz 频率以及不同声功率下，超声波对衣藻和盐藻悬浮液的影响。结果表明，藻类数量的减少既依赖于频率又依赖于声功率。在不同频率下，超声破坏衣藻的效率顺序为 20 < 580 < 864 < 1146 kHz，而对盐藻则为 20 < 580 ≅ 864 ⩽ 1146 kHz。显然，高频超声比传统的低频超声对两种细胞的破坏更有效。结果表明，每种藻类的合适破坏频率与细胞的机械特性有关。根据藻类细胞的机械共振，讨论了藻类破坏效率对频率的依赖性，这是在超声场中气泡振荡的结果。
