A cellulose monolithic stir bar for sorptive extraction of glycerol from biodiesel.

Autor:	Martins PHS; Instituto de Química, Universidade Federal de Uberlândia 38304-402 Uberlândia MG Brazil anizio@ufu.br., Barros MA; Instituto de Química, Universidade Federal de Uberlândia 38304-402 Uberlândia MG Brazil anizio@ufu.br., Silva CL; Instituto de Química, Universidade Federal de Uberlândia 38304-402 Uberlândia MG Brazil anizio@ufu.br., Ricci P; Instituto de Química, Universidade Federal de Uberlândia 38304-402 Uberlândia MG Brazil anizio@ufu.br., Castilho LMB; Instituto de Química, Universidade Federal de Uberlândia 38304-402 Uberlândia MG Brazil anizio@ufu.br., Santos ALR; Instituto de Química, Universidade Federal de Uberlândia 38304-402 Uberlândia MG Brazil anizio@ufu.br., Rodrigues HS; Instituto de Ciências Exatas e Naturais do Pontal, Universidade Federal de Uberlândia 38304-402 Ituiutaba MG Brazil., Assunção RMN; Instituto de Química, Universidade Federal de Uberlândia 38304-402 Uberlândia MG Brazil anizio@ufu.br.; Instituto de Ciências Exatas e Naturais do Pontal, Universidade Federal de Uberlândia 38304-402 Ituiutaba MG Brazil., Faria AM; Instituto de Química, Universidade Federal de Uberlândia 38304-402 Uberlândia MG Brazil anizio@ufu.br.; Instituto de Ciências Exatas e Naturais do Pontal, Universidade Federal de Uberlândia 38304-402 Ituiutaba MG Brazil.
Jazyk:	angličtina
Zdroj:	RSC advances [RSC Adv] 2024 May 29; Vol. 14 (25), pp. 17380-17388. Date of Electronic Publication: 2024 May 29 (Print Publication: 2024).
DOI:	10.1039/d4ra02985b
Abstrakt:	This work presents an eco-friendly approach for determining free glycerol in biodiesel samples, using a cellulose monolith stir bar in the sorptive extraction method with analysis by high-performance liquid chromatography and a refractive index detector. The cellulose monolith was produced from cellulose acetate by non-solvent-induced phase separation and subsequent alkaline deacetylation. The cellulose monolith presented a hierarchically porous structure, with 68% porosity and almost total deacetylation, with morphological and polarity characteristics that favor an efficient extraction of free glycerol from biodiesel. The sorptive extraction method using a cellulose monolith stir bar was optimized, obtaining a total extraction time of 30 min at 70 °C, using ultrapure water as the desorption solvent, and extraction of free glycerol of 93.6 ± 2.3%. The proposed method showed selectivity in free glycerol extraction, with limits of detection and quantification of 6.60 × 10 -5 % w/w and 2.18 × 10 -4 % w/w, respectively. Compared with the official reference method, the proposed one presented similar precision and accuracy, with few manipulations and any reagent/solvents. Furthermore, it is compatible with the principles of green chemistry and can be considered an eco-friendly method for determining free glycerol in biodiesel. Competing Interests: There are no conflicts to declare. (This journal is © The Royal Society of Chemistry.)
Databáze:	MEDLINE
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