超声空化对竹材微观结构及淀粉颗粒的影响

Effect of ultrasonic cavitation on microscopic structure and starch granule of bamboo

为提高竹材的渗透性,运用超声空化作用处理毛竹,研究了超声处理工艺对竹材质量损失率和微观构造及竹材淀粉的影响。结果表明:随着超声功率的增加和处理时间的延长,竹材的质量损失率增加;经过超声处理后,竹材薄壁细胞和厚壁细胞都没有明显的破坏现象,薄壁细胞壁变薄,薄壁细胞里充满的淀粉粒大量消失。SEM分析表明超声后竹材细胞内壁上附着有龟裂的物质,说明超声处理明显提高了竹材的渗透性,使淀粉颗糊化后流出,促进了竹材内淀粉的去除。

This paper studied mass loss and microstructure of Moso bamboo and starch characteristic after ultrasound treat- ment in order to make bamboo more permeable. The results showed that mass loss of bamboo rose with the increase of ultra- sound power and treatment time. Starch granules located mainly in parenchyma cells disappeared after ultrasound treat- ment. The cell wall of parenchyma cells turned thinner after the treatment, while the thickness of vascular bundle changed little. Scanning electron microscopy （SEM） analysis illustrated cracked deposit sticking to the inner side of the cell wall. Therefore, it can be concluded that ultrasonic cavitation significantly increased the permeability of Moso bamboo, which in turn promoted the smash and gelatinization as well as effusion of starch granules.