Influence of Tobiko-Mixed Artificial Diet on Textile Properties of Bombyx mori Silkworm Cocoons

ABSTRACT

We attempted to use tobiko powder, a byproduct of the konjac cake production, to rear the 5^th-instar silkworms by mixing it in the artificial diet, and found that tobiko powder was usable up to the mixing ratio of 20 wt%. Even when the content of mulberry leaf powder in the diet was decreased down to 10 wt% with inversely increasing the tobiko powder up to 20 wt%, the 5^th-instar silkworms yielded cocoons comparable to the conventional rearing. However, the spinning habit of the silkworm was a little modified probably by the bioactive chemicals contained in the tobiko powder. Further, yellowing occurred on the surface of the trial raw silk fibers, suggesting that some substances contained in the tobiko powder were excreted in the sericin layer of the cocoon threads. Such change in the composition of sericin layer effectively promoted the enzymatically degumming and then, a glossiness of the degummed fibers was enhanced due to the formation of the fibrillary lines passing along the fiber axis on the fiber surface. In addition, WAXD analysis revealed that the crystallinity of the trial fibers was a little superior to that of the conventional fibers.

摘要

用魔芋饼副产品托比科粉在人工饲料中混合饲养5龄家蚕，结果表明，托比科粉在20%的混合比例下可供使用. 即使饲料中桑叶粉的含量降低到10%，而托比科粉的含量增加到20%，5龄家蚕的产茧量也与常规饲养相当. 然而，蚕丝的纺纱习性可能是由蚕丝粉中含有的生物活性化学物质所改变的. 此外，试验生丝纤维表面发生黄变，表明托比科粉中的某些物质在茧丝的丝胶层中排出. 这种丝胶层组成的变化有效地促进了酶法脱胶，并在纤维表面形成沿纤维轴的纤维线，从而提高了脱胶纤维的光泽度. 另外，WAXD分析表明，试验纤维的结晶度略优于常规纤维.

KEYWORDS:

• Silkworm
• artificial diet
• konjac tobiko
• ceramide
• glossiness
• textile property

关键词:

• 蚕
• 人工饲料
• 魔芋
• 神经酰胺
• 光泽度
• 纺织品性能