First characterization report of natural pearl of Pinctada fucata from Gulf of Mannar

Biotechnology Research and Innovation Pub Date : 2018-01-01 DOI:10.1016/j.biori.2017.11.002

C.P. Suja, S. Lakshmana Senthil, Bridget Jeyatha, Jensi Ponmalar, Koncies Mary

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引用次数: 3

Abstract

The present study is aimed to characterize the natural pearl of Pinctada fucata from Gulf of Mannar by Scanning Electron Microscope (SEM) and Energy Dispersive Studies (EDS). Pearl oysters (P. fucata) from Kayalpattinam, Gulf of Mannar, were landed as a by-catch in the bottom set gill net at a depth of 4 m and collected for tissue culture studies. During mantle tissue dissection, a good lustrous, round pearl of 1.5 mm size was found in the mantle fold of pearl oyster P. fucata. This evidenced the existence of natural pearl oyster beds and natural pearls in this region. It was analyzed by Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) to find out the composition of nacre. Parallel orientation of crystals to form the lamellar formation of nacre is clearly visible in SEM. Pseudo-hexagonal aragonite crystals arranged in a uniform layer and joined together to form a lamella with inter-lamellar matrix. Two forms of calcium (CaO and CaCO₃) obtained in EDS analysis. Calcium content in the natural pearl is 66.05% which is clearly reveals the aragonite form. Niobium (Nb) was attained at 6% in natural pearl which is the first report in its kind and it may also play a role in the formation of lustrous layer. There are so many characterization reports available about mother of pearl in shell of different species, but this is the first report of natural pearl from P. fucata.

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马纳尔湾天然珍珠富卡塔珠的首次鉴定报告

利用扫描电子显微镜(SEM)和能谱分析(EDS)对产自马纳尔湾的天然珍珠fucata Pinctada进行了表征。来自马纳尔湾Kayalpattinam的珍珠牡蛎(P. fucata)作为副渔获物落在4米深的底置刺网中，并收集用于组织培养研究。在地幔组织解剖过程中，在fucata珍珠牡蛎的地幔褶皱中发现了一颗1.5 mm大小、色泽良好的圆形珍珠。这证明了该地区存在天然珍珠牡蛎床和天然珍珠。采用扫描电镜(SEM)和能谱仪(EDS)对其进行了分析，确定了珍珠质成分。在扫描电镜中可以清楚地看到平行取向的晶体形成珍珠层。拟六方文石晶体排列成均匀的层状，并结合在一起形成具有层间基质的片层。能谱分析得到两种形式的钙(CaO和CaCO3)。天然珍珠钙含量为66.05%，明显显示文石形态。在天然珍珠中铌含量为6%，这是首次报道，它也可能在光泽层的形成中起作用。关于不同种类贝壳中珍珠母的鉴定报道很多，但这是首次报道天然富卡塔珍珠。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Biotechnology Research and Innovation

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