The study aimed to investigate and compare some characteristics
of Bombyx mori and Eri (Philosamia ricini) silks in different
forms; with and without sericin. The protein contents were measured and
find out the composition of the silk fibroin and sericin proteins by Lowry
method. The secondary structure and thermal behavior of all kind of silk
were determined by FT-IR and TA instrument, respectively. The B. mori
composed of more amount of sericin content than that of Eri silk. FT-IR
spectra indicated that the Eri silk was similar profile of silk with and
without sericin, whereas B. mori silk showed dramatically differed.
With sericin, B. mori composed of higher ratio random coil and
α-helix structures than β-structure. With thermogravimetric
analysis, both B. mori and Eri silk fibers without sericin showed
higher stability than that silk fiber with sericin. This is due to the
crystalline region of hydrophobic amino acid composed in the fibroin core
protein. The differential scanning calorimetry thermogram of B. mori
was differed from Eri silk fiber. It is a promising that characteristics
of the silk were influenced by both silk components and silk varieties.
S. Prasong, S. Yaowalak and S. Wilaiwan, 2009. Characteristics of Silk Fiber with and without Sericin Component: A Comparison between Bombyx mori and Philosamia ricini Silks. Pakistan Journal of Biological Sciences, 12: 872-876.