基于拉曼光谱与色度学的彩色淡水有核珍珠研究

doi:10.3964/j.issn.1000-0593(2024)06-1684-05

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Abstract Freshwater nucleated pearls have gained a significant share in the pearl market, due to their large size, good roundness, rich color, and strong luster. However, there is still no explicit conclusion on color-causing mechanism in colored freshwater nucleated pearls, which is attributed to the fact that there are very few studies currently focused on the mechanism research. Herein, we filtrate multiple colors of freshwater cultured pearls to study the mechanism via laser Raman spectroscopy and colorimetry. The Raman spectroscopy revealed these samples possess three different C—C and C═C peaks, exhibiting interesting corresponding relationship, which means the concurrence of C—C (1 123～1 125 cm^-1) corresponding to the C═C (1 506～1 509 cm^-1), the C—C (1 132～1 134 cm^-1) corresponding to the C═C (1 522～1 523 cm^-1) or the C═C (1 525 cm^-1), the C—C (1 128～1 131 cm^-1) corresponding to the C═C double peak (1 506～1 509 and 1 520～1 523 or 1 525 cm^-1). Owing to the differences of C═C peaks in the Raman spectra, the samples were classified into P, T, G, P+T, T+G, and P+G. Combining with the chromatic parameters, we explored the relationship between the lightness (L) or saturation (S) and the CO₃/C—C peak area ratio in the same type, displaying the positive correlation between the lightness (L) and the CO₃/C—C peak area ratio for P-type pearls. In contrast, the negative correlation was found between the saturation (S) and the CO₃/C—C peak area ratio for P, T, and G types, which confirmed that the three different C—C and C═C peaks were caused by different color-causing substances. Moreover, we attributed color-causing organic compounds to linear polyenes by Raman spectroscopy. The Raman peaks of linear polyenes show redshift with the increase of orderliness. Linear polyene molecules with peaks closer to the infrared region have more extended and straighter carbon skeletons, which leads to the difference between the peaks of C—C and C═C in the Raman spectra of different samples. We also categorised the colored freshwater nucleated pearls via chromatic parameters. The pearls with hue angle (h)∈(0, 15), (15, 45), (335, 360) are classified as the red series, yellow series, and purple series, respectively.

Key words：Freshwater nucleated pearl;Raman spectra;Chromaticity;Peak area ratio;Linear polyene

Received: 2022-11-13 Accepted: 2023-09-27

ZTFLH:

P575.4

Corresponding Authors: ZU En-dong E-mail: zend88@163.com

Cite this article:

WANG Zi-xuan,YANG Miao,LIU Di-wen, et al. The Study of Colored Freshwater Nucleated Pearl Via Raman Spectra and Chromaticity[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(06): 1684-1688.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2024)06-1684-05 OR https://www.gpxygpfx.com/EN/Y2024/V44/I06/1684

[1] HE Zhi-ran，HU Hong-hui，FENG Shang-le，et al(何志然，胡宏辉，冯上乐，等). Journal of Dalian Ocean University(大连海洋大学学报)，2021，36(2): 254.
[2] SUN Chao-hu，BAI Zhi-yi，LI Qing-qing，et al(孙朝虎，白志毅，李清清，等). Progress in Fishery Sciences(渔业科学进展)，2019，40(2): 91.
[3] National Standards of the People's Republic of China(中华人民共和国国家标准). GB/T 40746—2021. Freshwater Nucleated Pearl(淡水有核珍珠). Issued by State Administration for Market Regulation, National Stndardization Management Committee(国家市场监督管理总局，国家标准化管理委员会发布).
[4] ZHANG Gang-sheng，XIE Xian-de，WANG Ying(张刚生，谢先德，王英). Acta Mineralogica Sinica(矿物学报)，2001，(3): 389.
[5] HAO Yu-lan，ZHANG Gang-sheng(郝玉兰，张刚生). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2006，26(1): 78.
[6] ZHANG Lian，LIU Ying-xin(张莲，刘迎新). Journal of Chinese Electron Microscopy Society(电子显微学报)，2020，39(3): 323.
[7] YANG Xiao-yi，ZHOU Zheng-yu，QI Xiao-man，et al(杨萧亦，周征宇，戚筱曼，等). Laser & Optoelectronics Progress(激光与光电子学进展)，2021，58(24): 514.
[8] HU Yang，FAN Lu-wei，HUANG Yi-lan(胡洋，范陆薇，黄艺兰). Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2014，34(1): 98.
[9] JIANG Qi，BAI Zhi-yi，SUN Chao-hu(姜琦，白志毅，孙朝虎). Journal of Shanghai Ocean University(上海海洋大学学报)，2019，28(6): 882.
[10] Minto R E，Blacklock B J. Progress in Lipid Research，2008，47(4): 233.
[11] Xie Qi，Wang Changhong. Phytochemistry，2022，201: 113288.
[12] CHEN Qiang，JIANG Xia-min，PENG Rui-bing，et al(陈锵，蒋霞敏，彭瑞冰，等). Journal of Fisheries of China(水产学报)，2021，45(6): 899.
[13] SUN Ming-long，BAI Zhi-yi，FU Bai-cheng，et al(孙明龙，白志毅，傅百成，等). South China Fisheries Science(南方水产科学)，2020，16(5): 80.
[14] Li Xuenan，Feng Shangle，Xuan Xingrong，et al. Fish & Shellfish Immunology，2022，127: 788.
[15] Macernis M，Streckaite S，Litvin R，et al. The Journal of Physical Chemistry，A，2022，126: 813.
[16] National Standards of the People's Republic of China(中华人民共和国国家标准). GB/T 18781—2008. Cultured Pearl Grading(珍珠分级). Issued by Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of China(中华人民共和国国家质量监督检验检疫总局，中国国家标准化管理委员会发布).