Biogenic Structure of Seashells: Mineralogical and Surface Properties of Flexopecten glaber (Linnaeus, 1758) Collected from Bandırma Bay, the Sea of Marmara

Yıl 2025, Cilt: 7 Sayı: 1, 29 - 36, 30.06.2025

Harun Yıldız , Bayram Kızılkaya

https://doi.org/10.51756/marlife.1714618

https://izlik.org/JA62LP59HL

Öz

This study was conducted to determine the mineralogical structure and surface characteristics of marine shells belonging to the species Flexopecten glaber (Linnaeus, 1758). In the study, characterization was performed using PZC (point of zero charge), XRD (X-ray diffraction), SEM-EDS (Scanning Electron Microscopy – Energy Dispersive Spectroscopy), and FT-IR (Fourier Transform Infrared Spectroscopy) techniques. As a result of the PZC analysis, the zero point charge of the shell surface was determined to be at pH 8.33, indicating that the surface carries a positive charge below pH 8.33 and a negative charge above this value. This suggests that the shell surface may exhibit significant differences in electrostatic behavior in response to environmental pH changes. XRD analyses revealed that the crystal structure of the shells was predominantly showed as calcium carbonate (CaCO₃) form. EDS results showed that the shell composition contains 54.9% carbon, 7.5% calcium, and 6.1% nitrogen. Additionally, trace amounts of sodium (0.2%), magnesium (0.1%), and sulfur (0.1%) were detected. These data indicate that the shell structure is a complex biomaterial composed of both inorganic and organic components. The results provide important data for understanding the sensitivity of Flexopecten glaber shells to environmental factors and the responses of marine organisms to environmental changes. This study offers significant scientific contributions for understanding environmental adaptation mechanisms and the sustainable management of marine resources.

Anahtar Kelimeler

Flexopecten glaber , Biomineralization , Point of Zero (PZC) , XRD , SEM-EDS

Proje Numarası

113O381

Deniz Kabuklarının Biyojenik Yapısı: Bandırma Körfezi, Marmara Denizi'nden Toplanan Flexopecten glaber'in (Linnaeus, 1758) Mineralojik ve Yüzey Özellikleri

https://izlik.org/JA62LP59HL

Öz

Bu çalışma, Flexopecten glaber türüne ait deniz kabuklarının mineralojik yapısını ve yüzey karakteristiklerini belirlemek amacıyla gerçekleştirilmiştir. Araştırma kapsamında, PZC (sıfır yük noktası), XRD (X-ışını kırınımı), SEM-EDS (Taramalı Elektron Mikroskobu – Enerji Dağılımlı Spektroskopi) ve FT-IR (Fourier Dönüşümlü Kızılötesi Spektroskopi) teknikleri kullanılarak kapsamlı bir karakterizasyon yapılmıştır. PZC analizi sonucunda, kabuk yüzeyinin sıfır yük noktası pH 8,33 olarak belirlenmiş ve bu değer, yüzeyin pH 8,33'ün altında pozitif, üzerinde ise negatif yük taşıdığını ortaya koymuştur. Bu durum, kabuk yüzeyinin çevresel pH değişikliklerine karşı elektrostatik davranışlarında önemli farklılıklar gösterebileceğini işaret etmektedir. XRD analizleri, kabukların kristal yapısının büyük oranda aragonit formundaki kalsiyum karbonat (CaCO₃) olduğunu ortaya koymuştur. EDS sonuçları, kabuk kompozisyonunun %55,3 oranında karbon, %30,2 oranında kalsiyum ve %5,8 oranında azot içerdiğini ortaya koymuştur. Ayrıca, eser miktarda sodyum (%0,3), magnezyum (%0,1) ve kükürt (%0,1) elementleri de tespit edilmiştir. Bu veriler, kabuk yapısının hem inorganik hem de organik bileşenlerden oluşan kompleks bir biyomalzeme olduğunu göstermektedir. Elde edilen bulgular, Flexopecten glaber kabuklarının çevresel faktörlere duyarlı ve denizel organizmaların çevresel değişimlere verdiği yanıtların anlaşılması açısından önemli veriler ortaya koymaktadır. Bu çalışma, çevresel adaptasyon mekanizmalarının anlaşılması ve sürdürülebilir deniz kaynaklarının değerlendirilmesi açısından önemli bilimsel katkılar sunmaktadır.

Anahtar Kelimeler

Flexopecten glaber , Biyomineralizasyon , Sıfır yük noktası (PZC) , XRD , SEM-EDS

Proje Numarası

113O381

Kaynakça

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