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. 2024 Feb 5;12(1):209–224. doi: 10.5599/admet.2204

Table 2.

Phenolic composition of PE and PE-loaded liposomes by LC-MS/MS method, ionization mode ESI(-)

Compounds Molecular formula RT, min Precursor ion m/z Product ion(s) m/z Cone voltage, V Collision energy, eV PE content, mg/g Content, μg/mL liposome
L1-PE4 L2-PE2
3,4 dimethoxy cinnamic acid C11H12O4 19.1 206.7 102.7 25 20 6.62±0.47 440.88±8.64a 207.72±4.07b
Apigenin C15H10O5 25.0 269 117.3/149/151 40 30/25/25 3.30±0.14 187.22±6.52a 88.21±3.07b
Caffeic acid C9H8O4 10.9 179 135 25 20 4.19±1.15 385.78±11.69a 181.76±5.50b
CAPE C17H16O4 32.4 283 179/161/135 25 20 12.66±0.74 649.48±1.41a 306.01±0.66b
Chrysin C15H10O4 30.9 253 225/209/151 25 20 9.31±1.08 450.72±11.54a 212.36±5.44b
Trans-ferulic acid C10H10O4 14.7 193 178/149/134 25 20 1.60±0.21 131.58±8.66a 61.99±4.08b
Galangin C15H10O5 31.9 269 197/213/227 25 20 14.36±1.48 824.20±3.25a 388.33±1.53b
Kaempferol C15H10O6 25.4 285 93/151/257 25 20 3.68±0.15 208.97±24.57a 98.45±11.57b
Luteolin C15H10O6 22.3 285 133/241/267 25 20 0.94±0.02 61.80±10.78a 29.12±5.08b
Naringenin C15H12O5 24.2 271 145/151 25 20 2.07±0.06 106.18±8.01a 50.03±3.78b
p-coumaric acid C9H8O3 13.5 163 93/119/147 25 20 2.14±0.27 191.21±3.92a 90.09±1.85b
Pinobanksin C15H12O5 24.3 271.2 153/225/253 25 20 14.06±0.98 616.90±34.34a 290.66±16.18b
Pinocembrin C15H12O4 31.1 255 151/171/213 25 20 18.64±0.54 1291.69±3.12a 608.58±1.47b
Quercetin C15H10O7 22.4 301 150.8/178.9 35 20 1.67±0.18 151.02±4.29a 71.15±2.02b
Trans-cinnamic acid C9H8O2 21.1 147 77/102.8 25 20 2.33±0.12 183.47±28.99a 86.44±13.66b
Total 97.56 6012.19 2782.96

Data are expressed as mean ± S.D. of triplicate measurements. The values with different superscript lowercase letters between L1-PE4 and L2-PE2 samples are significantly different (p<0.05). RT: retention time. PE: propolis extract; L1-PE4: PE (4 %, w/v) loaded liposomes incorporated with T80; L2-PE2 : PE (2 %, w/v) loaded liposomes incorporated with AMP. T80: Tween 80, polyoxyethylene sorbitan monooleate; AMP: ammonium phosphatide 4455.