SUPERCRITICAL EXTRACTION OF LYOPHILIZED STRAWBERRY ANTHOCYANINS WITH PULSED ELECTRIC FIELDS PRETREATMENT

Ávila-Hernández, Marco A.; Pérez-Alonso, César; Orozco-Villafuerte, Juan; Barrera-Díaz, Carlos E.; Alpizar-Reyes, Erik; Cruz-Olivares, Julian

doi:10.21577/0100-4042.20170849

Acessibilidade / Reportar erro

Brasil

Español English

sumário « anterior atual seguinte »

Sumário

Nota Técnica • Quím. Nova 45 (06) • 2022 • https://doi.org/10.21577/0100-4042.20170849 copy

SUPERCRITICAL EXTRACTION OF LYOPHILIZED STRAWBERRY ANTHOCYANINS WITH PULSED ELECTRIC FIELDS PRETREATMENT

Authorship SCIMAGO INSTITUTIONS RANKINGS

The lyophilized strawberry anthocyanins were extracted using a supercritical extraction (SE) process. The effect of pulsed electric fields (PEF) as pretreatment and the influence of the addition of ethanol as a cosolvent on the percentage of extraction yield (EY) and the total anthocyanin concentration (TAC) were analyzed. The effect of PEF was evaluated at 0.5 and 1.0 kV/cm, while the effect of the cosolvent was studied in mixtures of supercritical carbon dioxide - ethanol (SCCO₂ + ethanol) at 1.6 and 3.3% by weight. The best results (% EY = 0.506, TAC = 0.428 g /100 g of lyophilized strawberry) were obtained with a PEF pretreatment of 1.0 kV cm^-1, 3.3%wt. ethanol at 200 bar and 333.15 K. The experimental results of solubility were suitably adjusted with the Kumar and Johnston model. The maximum solubility (0.114 g/100 g of solvent mixture) was obtained at 300 bar and 313.15 K.

Keywords:
lyophilized strawberry; anthocyanins; supercritical extraction; pulsed electric fields; supercritical carbon dioxide.

Code	Supercritical extraction process	Cosolvent	Pretreatment by PEF
1	200 bar at 313.15, 323.15 and 333.15 K.	--------	----------
2	200 bar at 313.15, 323.15 and 333.15 K.	---------	3 pulses of 10 µs with electrical potentials of 0.5 and 1.0 kV/cm
3	200 bar at 313.15, 323.15 and 333.15 K.	12.5 or 25 mL of ethanol	---------
4	200 bar at 313.15, 323.15 and 333.15 K.	25 mL of ethanol	3 pulses of 10 µs with an electrical potential of 1.0 kV/cm

Experiment	LSB (g)	PEF (kV/cm)	Ethanol (g)	SC-CO₂ (g)	Pressure (bar)	Temperature (K)	^*EY (%)	^*TAC (g/100 g of LSB)
1	100	0	0	515.448	100	313.15	0.13	0.112
2	100	0	0	315.151	100	323.15	0.16	0.143
3	100	0	0	237.720	100	333.15	0.21	0.185
4	100	0	0	688.635	200	313.15	0.19	0.158
5	100	0	0	643.128	200	323.15	0.22	0.176
6	100	0	0	593.434	200	333.15	0.28	0.231
7	100	0.5	0	593.434	200	333.15	0.30	0.247
8	100	1	0	593.434	200	333.15	0.36	0.298
9	100	0	9.863	584.388	200	333.15	0.36	0.305
10	100	0	19.725	575.342	200	333.15	0.38	0.315
11	100	1	19.725	575.342	200	333.15	0.51	0.428

T (K)	A	B	C	r²2 Smeriglio, A.; Barreca, D.; Bellocco, E.; Trombetta, D.; Phytother Res. 2016, 30, 1265.
313.15	54.848	19665	5.9858	0.998
323.15	54.848	19665	4.2918	0.996
333.15	54.848	19665	2.3974	0.997

Sociedade Brasileira de Química Secretaria Executiva, Av. Prof. Lineu Prestes, 748 - bloco 3 - Superior, 05508-000 São Paulo SP - Brazil, C.P. 26.037 - 05599-970, Tel.: +55 11 3032.2299, Fax: +55 11 3814.3602 - São Paulo - SP - Brazil
E-mail: quimicanova@sbq.org.br

Acompanhe os números deste periódico no seu leitor de RSS

[1] *e-mail: jcruzo@uaemex.mx