Raman Technology for Process Control: Waste Shell Demineralization for Producing Transparent Polymer Foils Reinforced with Natural Antioxidants and Calcium Acetate By-Products

Pînzaru, Simona Cîntă; Poplăcean, Iuliana-Cornelia; Maškarić, Karlo; Dumitru, Dănuț-Alexandru; Barbu-Tudoran, Lucian; Tămaș, Tudor-Liviu; Nekvapil, Fran; Neculai, Bogdan

doi:10.3390/pr12040832

Open AccessFeature PaperEditor’s ChoiceArticle

Raman Technology for Process Control: Waste Shell Demineralization for Producing Transparent Polymer Foils Reinforced with Natural Antioxidants and Calcium Acetate By-Products

by

Simona Cîntă Pînzaru

^1,2,*

,

Iuliana-Cornelia Poplăcean

^1,*

,

Karlo Maškarić

^1,2,*,

Dănuț-Alexandru Dumitru

¹

,

Lucian Barbu-Tudoran

^3,4

,

Tudor-Liviu Tămaș

⁵

,

Fran Nekvapil

^1,2,3

and

Bogdan Neculai

⁶

¹

Biomolecular Physics Department, Babeş–Bolyai University, Kogălniceanu 1, 400084 Cluj-Napoca, Romania

²

Institute for Research, Development and Innovation in Applied Natural Sciences, Babeș-Bolyai University, Fântânele 30, 400327 Cluj-Napoca, Romania

³

National Institute for Research and Development of Isotopic and Molecular Technologies, Donath 67-103, 400293 Cluj-Napoca, Romania

⁴

Electron Microscopy Center, Babeș-Bolyai University, Clinicilor 5-7, 400006 Cluj-Napoca, Romania

⁵

Department of Geology, Babeș-Bolyai University, M. Kogălniceanu 1, 400084 Cluj-Napoca, Romania

⁶

Metrohm Analytics Romania SRL, E. Racoviţă 5, 041753 Bucharest, Romania

^*

Authors to whom correspondence should be addressed.

Processes 2024, 12(4), 832; https://doi.org/10.3390/pr12040832

Submission received: 15 March 2024 / Revised: 12 April 2024 / Accepted: 14 April 2024 / Published: 19 April 2024

(This article belongs to the Special Issue Solid and Hazardous Waste Disposal and Resource Utilization)

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Abstract

Waste biogenic materials derived from seafood exploitation represent valuable resources of new compounds within the blue bioeconomy concept. Here, we describe the effectiveness of Raman technology implementation as an in-line tool for the demineralization process control of crustaceans or gastropods. Transparent chitin polymeric foils and calcium acetate by-products were obtained from three waste crustacean shells (C. sapidus, S. mantis, and M. squinado) using a slow, green chemical approach employing acetic acid. Progressive mineral dissolution and increasing of the Raman characteristic signal of chitin is shown in a time-dependent manner using NIR-Raman spectroscopy, while resonance Raman shows intact carotenoids in reacted shells after 2 weeks. Chitin foil products are species-specific, and the demineralization bath of the waste shell mixture can be effectively tracked by Raman tools for solvent control and decision making for the recovery of calcium acetate by-products. Comparatively obtained calcium acetate from Rapana venosa snail shells, the subject of Raman analyses, allowed assessing by-product identity, hydration status, purity, and suitability as recrystallized material for further use as a pharmaceutical compound derived from different crustaceans or gastropod species. Cross validation of the results was done using FT-IR, XRD, and SEM-EDX techniques. A hand-held flexible TacticID Raman system with 1064 nm excitation demonstrated its effectiveness as a rapid, in-line decision making tool during process control and revealed excellent reproducibility of the lab-based instrument signal, suitable for in situ evaluation of the demineralization status and solvent saturation control.

Keywords: Raman technology; recovery and resource utilization technology; process control; biogenic carbonate waste; demineralization process control; chitin; calcium acetate drug; carotenoids

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MDPI and ACS Style

Pînzaru, S.C.; Poplăcean, I.-C.; Maškarić, K.; Dumitru, D.-A.; Barbu-Tudoran, L.; Tămaș, T.-L.; Nekvapil, F.; Neculai, B. Raman Technology for Process Control: Waste Shell Demineralization for Producing Transparent Polymer Foils Reinforced with Natural Antioxidants and Calcium Acetate By-Products. Processes 2024, 12, 832. https://doi.org/10.3390/pr12040832

AMA Style

Pînzaru SC, Poplăcean I-C, Maškarić K, Dumitru D-A, Barbu-Tudoran L, Tămaș T-L, Nekvapil F, Neculai B. Raman Technology for Process Control: Waste Shell Demineralization for Producing Transparent Polymer Foils Reinforced with Natural Antioxidants and Calcium Acetate By-Products. Processes. 2024; 12(4):832. https://doi.org/10.3390/pr12040832

Chicago/Turabian Style

Pînzaru, Simona Cîntă, Iuliana-Cornelia Poplăcean, Karlo Maškarić, Dănuț-Alexandru Dumitru, Lucian Barbu-Tudoran, Tudor-Liviu Tămaș, Fran Nekvapil, and Bogdan Neculai. 2024. "Raman Technology for Process Control: Waste Shell Demineralization for Producing Transparent Polymer Foils Reinforced with Natural Antioxidants and Calcium Acetate By-Products" Processes 12, no. 4: 832. https://doi.org/10.3390/pr12040832

APA Style

Pînzaru, S. C., Poplăcean, I.-C., Maškarić, K., Dumitru, D.-A., Barbu-Tudoran, L., Tămaș, T.-L., Nekvapil, F., & Neculai, B. (2024). Raman Technology for Process Control: Waste Shell Demineralization for Producing Transparent Polymer Foils Reinforced with Natural Antioxidants and Calcium Acetate By-Products. Processes, 12(4), 832. https://doi.org/10.3390/pr12040832

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Raman Technology for Process Control: Waste Shell Demineralization for Producing Transparent Polymer Foils Reinforced with Natural Antioxidants and Calcium Acetate By-Products

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