Development of a new strategy based on the application of phytoregulators to induce phenolic acids in olive fruits

Figures & data

Table 1. Phenolic acid contents (expressed as mg 100 mg⁻¹ weight ± standard deviation) in olive fruits treated by different procedures (i.e. ABA paste, ABA spray, MJ paste and MJ vapor) on day 30 after treatment.

Tabla 1. Contenido de ácido fenólico (expresado como mg 100 mg-1 peso ± desviación estándar) en aceitunas tratadas mediante diferentes procedimientos (es decir, pasta ABA, pulverización ABA, pasta MJ y vapor MJ) el día 30 después del tratamiento.

Samples	Gallic acid	Chlorogenic acid	Vanillic acid	Caffeic acid	p-Coumaric acid	Ferulic aAcid
ABA paste control	0.20 ± 0.02a	0.84 ± 0.07a	0.93 ± 0.03a	0.43 ± 0.08a	0.11 ± 0.07a	0.35 ± 0.06a
ABA paste treated	0.23 ± 0.08a	0.81 ± 0.06a	1.03 ± 0.07a	0.53 ± 0.02a	0.09 ± 0.05a	0.33 ± 0.03a
ABA spraycontrol	0.18 ± 0.07a	0.90 ± 0.05a	0.89 ± 0.06a	0.47 ± 0.06a	0.13 ± 0.02a	0.42 ± 0.05a
ABA spray treated	0.53 ± 0.09b	1.58 ± 0.08b	1.81 ± 0.10b	1.50 ± 0.07b	0.49 ± 0.07b	0.98 ± 0.05b
MJ paste control	0.13 ± 0.01a	0.98 ± 0.04a	0.82 ± 0.02a	0.38 ± 0.07a	0.16 ± 0.04a	0.45 ± 0.04a
MJ paste treated	0.19 ± 0.07a	0.86 ± 0.05a	0.68 ± 0.05a	0.39 ± 0.01a	0.05 ± 0.04a	0.38 ± 0.02a
MJ vapor control	0.13 ± 0.07a	0.92 ± 0.05a	0.96 ± 0.06a	0.51 ± 0.06a	0.09 ± 0.02a	0.40 ± 0.05a
MJ vapor treated	0.63 ± 0.09b	1.62 ± 0.08b	1.69 ± 0.10b	1.25 ± 0.07b	0.53 ± 0.07b	1.04 ± 0.05b

Contents of phenolic acids in control samples corresponding to each treatment are also included for comparison. Data are presented as means of triplicated values.

Different letters in the same column between control and treated samples within each single treatment indicate significant (p < 0.05) differences.

Table 2. DPPH scavenging activity expressed as IC₅₀ (µg ml⁻¹) of olives untreated and treated with ABA spray at low temperature and MJ vapor at mild temperature after 30-day storage.

Tabla 2. Actividad de eliminación de DPPH expresada como CI50 (μg ml-1) de aceitunas no tratadas y tratadas con pulverización de ABA a baja temperatura y vapor de MJ a temperatura moderada después de 30 días de almacenamiento.

DPPH activity	ABA spray control	ABA spray treated	MJ vapor control	MJ vapor treated
IC50(µg ml^−1)	2.31 ± 0.07a	4.10 ± 0.05b	2.72 ± 0.06a	5.36 ± 0.06b

The values are expressed as means ± SD (n = 6). Different letters between control and treated indicate significant (p < 0.05) differences.