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    Characteristics of corneal lens chitin in dragonfly compound eyes
    (Elsevier Science Bv, 2016) Kaya, Murat; Sargin, Idris; Al-jaf, Ivan; Erdogan, Sevil; Arslan, Gulsin
    Chitin in the compound eyes of arthropods serves as a part of the visual system. The quality of chitin in such highly specialised body parts deserves more detailed examination. Chitin in the corneal (ommatidial) lenses of dragonfly (Sympetrum fonscolombii) compound eyes was isolated by using the classical chemical method. The chitin content of the corneal lenses was determined to be quite high (20.3 +/- 0.85%). The FT-IR analysis showed that corneal lens chitin was in the alpha-form as found in all arthropod species where mechanical strength is required. The surface morphology analysis by scanning electron microscopy revealed that the outer part of corneal lenses consisted of long chitin fibrils with regular arrays of papillary structures while the smoother inner part had concentric lamellated chitin formation with shorter chitin nanofibrils. Chitinase enzymatic digestion studies, elemental analysis results and the degree of acetylation value showed the purity of chitin samples from corneal lens. The maximum degradation temperature value of the corneal lens chitin was observed at 369.2 degrees C. X-ray analysis revealed that corneal lens chitin has high crystallinity index; 96.4%. Identification of chitin found in ommaditia of insect compound eyes can provide insights into insect vision and chitin-based optical material design studies. (C) 2016 Elsevier B.V. All rights reserved.
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    Chitin extraction and characterization from Daphnia magna resting eggs
    (Elsevier Science Bv, 2013) Kaya, Murat; Sargin, Idris; Tozak, Kabil Ozcan; Baran, Talat; Erdogan, Sevil; Sezen, Goksal
    New application areas for chitin and its derivatives have been extensively investigated and there is a solid, growing demand for new chitin sources. In this present study, chitin content of Daphnia magna resting egg (18-21%) was determined for the first time. FTIR, elemental analysis, TGA, XRD and SEM studies revealed the structural and thermal properties of extracted alpha-chitin. This study suggests that D. magna resting eggs can be exploited as an attractive alternative chitin source. (C) 2013 Elsevier B.V. All rights reserved.
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    GENDER INFLUENCES DIFFERENTIATION OF CHITIN AMONG BODY PARTS
    (Wiley-Blackwell, 2016) Kaya, Murat; Bulut, Esra; Mujtaba, Muhammad; Sivickis, Karolis; Sargin, Idris; Akyuz, Bahar; Erdogan, Sevil
    Earlier reports have established that chitin isolates from each body part of an insect cuticle can exhibit diverse physicochemical properties. But it is still unknown if the gender of the insect can influence characteristics of chitin isolates from different body parts. The present study addresses this question. As a result, important physicochemical differences in the chitin samples from different body parts of Melolontha sp. were recorded on the basis of sex. The chitin samples were extracted from eight different body parts (antennae, head, eyes, thorax, abdomen, elytra, hindwings, and legs) of female and male. The most remarkable variations in the chitin isolates from female and male body parts were recorded in chitin content, crystallinity, thermal stability, and surface morphology. And also it was wondered these chitin isolates from different body parts of female and male could find different applications. To check this hypothesis, the chitin samples from female and male were interacted with bovine serum albumin (BSA) protein and important variations were observed. (C) 2016 Wiley Periodicals, Inc.