Chitosan And Dextran Based Powders – The Preparation, Performance Comparison and Potential Application in Forensic Examination of Latent Fingermarks

Yıl 2022, Cilt: 4 Sayı: 1, 3 - 18, 13.10.2022

Nemanja Vuckovıc Biljana Koturevıc Nikola Mılasınovıc

Öz

The papillary lines are unique for each person, and that feature is
frequently used in modern forensic science to identify and distinguish individuals.
Fingerprints are often present at the crime scene, but they are usually
in the form of latent (invisible) marks which need to be visualized prior
to the further processing. Many routinely employed commercial methods
show harmful effect on human health, so the research groups are constantly
trying to improve or develop some new approaches, and some of them are
resorting to the utilization of bio(polymeric) materials. This paper deals
with chitosan- and dextran-based biopowders prepared and characterized to
evaluate their potential application in visualizing latent fingermarks. Chitosan
and dextran are widely used in medicinal and pharmaceutical applications,
but there are only a few studies regarding the utilization of these
biopolymers as a component for the fingerprint powder. These biopolymeric
materials offer many benefits, such as non-toxic properties, specific
binding mechanisms, and they also satisfy the cost-benefit demands. Two
chitosan-based formulations and one dextran-based formulation were obtained
in simple synthesis processes. FT-IR analyses confirmed interactions
between components of prepared systems. Optical microscopy showed that
prepared powder formulations possess small and uniformly distributed particles,
which contributed to their easy binding to the sweat and lipid residues
present in the fingerprint trace. Prepared formulations were tested on a
rubber (semi-porous) and glass (non-porous) surface. The results indicated
that the obtained bio-based powders have the potential to complement commercially
exploited physical systems/fingerprint powders in detecting and
enhancing latent fingermarks.

Anahtar Kelimeler

(Bio)polymers, Chitosan, Dextran, Hydrangea Macrophylla, Latent Fingermarks, Forensics

Kitosan ve Dekstran Bazlı Tozlar – Hazırlık, Performans Karşılaştırması ve Latent Parmak İzlerinin Adli İncelemesindeki Potansiyel Uygulama

Öz

Papiller çizgiler her birey için benzersizdir ve bu özellik, bireyleri tanımlamak ve ayırt etmek için modern adli bilimde sıkça kullanılmaktadır. Suç mahallerinde genellikle parmak izleri bulunur, ancak bu izler genellikle daha sonraki işlemlerden önce görselleştirilmesi gereken latent (görünmez) izler şeklindedir. Rutin olarak kullanılan birçok ticari yöntem insan sağlığı üzerinde zararlı etkiler gösterebilmekte, bu nedenle araştırma grupları sürekli olarak yeni yaklaşımlar geliştirmeye veya iyileştirmeye çalışmaktadırlar. Bazıları bu amaçla biyo(polimerik) materyallerin kullanımına başvurmaktadırlar. Bu makale, latent parmak izlerini görselleştirmede potansiyel uygulamalarını değerlendirmek için hazırlanan ve karakterize edilen kitosan ve dekstran bazlı biyotozları ele almaktadır. Kitosan ve dekstran, tıbbi ve farmasötik uygulamalarda yaygın olarak kullanılmakla birlikte, bu biyopolimerlerin parmak izi tozu bileşeni olarak kullanılmasıyla ilgili sadece birkaç çalışma bulunmaktadır. Bu biyopolimerik materyaller, toksik olmayan özellikler, spesifik bağlanma mekanizmaları sunar ve maliyet-fayda taleplerini de karşılarlar. İki kitosan bazlı ve bir dekstran bazlı formülasyon, basit sentez süreçlerinde elde edildi. FT-IR analizleri, hazırlanan sistemlerin bileşenleri arasındaki etkileşimleri onaylamıştır. Optik mikroskopi, hazırlanan toz formülasyonlarının küçük ve düzenli dağılmış partiküllere sahip olduğunu, bu partiküllerin parmak izi izinde bulunan ter ve lipid kalıntılarına kolayca bağlandığını göstermiştir. Hazırlanan formülasyonlar lastik (yarı gözenekli) ve cam (gözeneksiz) yüzeylerde test edilmiştir. Sonuçlar, elde edilen biyo-bazlı tozların, latent parmak izlerini tespit etmede ve artırmada ticari olarak kullanılan fiziksel sistemlere/parmak izi tozlarına eşlik edebileceğini göstermiştir.

Anahtar Kelimeler

(biyo)polimerler, Kitosan, Dekstran, Ortanca(Hydrangea Macrophylla), Latent Parmak İzleri, Adli Bilimler

Kaynakça

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