Gamma radiation and pasteurization on anthocyanin stability and antioxidant capacity of jussara pulp (<i>Euterpe edulis</i>) during storage

Rocha, Carolina Tatagiba da; Silva, Evelyn Campos Paiva da; Stringheta, Paulo César; Paula, Daniele de Almeida; Fernandes, Sergio Antônio; Pinto, Marcos Roberto Moacir Ribeiro; Ramos, Afonso Mota

doi:10.1590/0103-8478cr20210912

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FOOD TECHNOLOGY • Cienc. Rural 53 (6) • 2023 • https://doi.org/10.1590/0103-8478cr20210912 linkcopy

Gamma radiation and pasteurization on anthocyanin stability and antioxidant capacity of jussara pulp (Euterpe edulis) during storage

Efeito da radiação gama e pasteurização na estabilidade de antocianinas e na capacidade antioxidante da polpa jussara (Euterpe edulis) durante o armazenamento

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT:

The effects of gamma irradiation and pasteurization on the stability of anthocyanins and antioxidant capacity during storage of jussara pulp were investigated. Jussara pulp was divided into 6 portions: control (no treatment), irradiated pulp (2, 4, 6, 8 kGy) and pasteurized pulp (92 ºC/ 1 minute). Portions were stored at 4ºC for 60 days. The phenolic extract was prepared with a solution of methanol/water/formic acid. The following analyses were performed every 15 days: contents of total phenolic compounds by Folin-Ciocauteau, cyanidin-3-glycoside and cyanidin-3-rutiniside by HPLC and antioxidant capacity (ABTS and DPPH). Total phenolics and anthocyanins decreased with the increasing irradiation dose and storage time. Pasteurization did not affect the phenolic concentration immediately after processing. However, the contents of TPC and cyanidin-3-rutiniside were reduced during storage of the pasteurized pulp. No processed samples presented characteristics similar to the control at the end of storage.

Key words:
irradiation; flavonoids; phenolic compound; pasteurization

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Universidade Federal de Santa Maria Universidade Federal de Santa Maria, Centro de Ciências Rurais , 97105-900 Santa Maria RS Brazil , Tel.: +55 55 3220-8698 , Fax: +55 55 3220-8695 - Santa Maria - RS - Brazil
E-mail: cienciarural@mail.ufsm.br

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[TFN1] ¹ºBrix; ²% Citric acid.

Parameter	Result	Literature	Source
pH	4.7	4.0 a 6.2	BRASIL (2000)
Soluble solids¹	2.8	2.01	SILVA et al. (2013)
Acidity²	3.0	1.67	PAIM et al. (2016)
Moisture (%)	88.8	93.8	PAIM et al.(2016)

--------------------------------------------------------------------------Irradiation-------------------------------------------------------------------------------
Variable	Adjusted equations	R²	FAj
TPC	Y = 55.681 - 0.0726x₁ - 0.1594x₂	91.95%	0.977^ns
cy-3-rut	Y = 805.0 - 4.433x₁ - 16.23x₂	97.92%	0.997^ns
c-3-glc	Y = 172.97 - 1.2933x₁ - 3.083x₂	98.97%	0.999^ns
ABTS	Y = 503.6 - 1.125x₁	78,24%	0.992^ns
--------------------------------------------------------------------------Pasteurization--------------------------------------------------------------------------
Variable	Adjusted equations	R²	FAj
TPC	Y = 53.25 - 0.0869x₁	82.24%	0.611^ns
cy-3-rut	Y = 739.1 - 2.89x₁	84.62%	0.864^ns

Parameters	Time (Days)	--------------------------------------Dose (kGy)--------------------------------------				Pasteurization
		0	2	4	6	8
TPC	0	54.30	55.03	54.31	54.99	54.95	52.61
	15	54.81	54.67	53.50	54.09	53.78	51.97
	30	55.04	53.41	51.72	53.19	53.17	51.32
	45	52.10	51.79	52.04	51.00	50.87	50.49
	60	52.98	50.83	49.17	50.31	49.58	46.83
cy-3-rut	0	781.44	747.44	728.88	709.52	684.58	706.04
	15	772.91	698.74	692.11	615.54	613.64	742.84
	30	707.15	641.23	603.60	557.95	622.47	646.92
	45	607.80	571.77	541.74	495.01	466.89	607.87
	60	566.58	472.16	451.83	426.96	426.68	556.87
cy-3-glc	0	167.33	165.17	162.23	156.55	150.58	136.20
	15	159.70	147.19	145.21	125.86	127.74	140.06
	30	143.51	128.48	122.49	111.06	117.11	128.34
	45	110.65	104.30	104.50	90.35	86.72	115.73
	60	99.46	82.28	82.02	78.24	79.57	115.44
DPPH	0	204.37	199.77	194.36	196.68	196.41	190.13
	15	249.94	245.22	242.06	245.20	246.20	238.93
	30	231.19	223.29	215.07	216.76	224.21	217.71
	45	219.59	215.80	208.01	219.24	205.87	208.43
	60	234.81	217.22	222.62	223.18	224.32	212.03
ABTS	0	514.12	512.26	495.34	509.62	501.86	466.89
	15	527.81	480.56	444.73	453.48	446.52	450.61
	30	514.86	496.17	490.02	487.15	449.34	470.84
	45	474.06	460.29	463.08	439.73	454.00	453.68
	60	458.58	396.17	427.92	443.16	411.53	413.77