From:  Incorporation of natural antioxidants in biscuits using aqueous Pelargonium × hortorum red flower or Aloysia citrodora leaf extracts

 Characterization of biscuit samples prepared with extracts from Aloysia citrodora (lemon verbena) leaves and Pelargonium × hortorum (geranium) red flowers at different temperatures (130 and 160°C).

Sample typeWL (%)M (%)awsfV (cm3)T4 (cm)σ (kN m–2)εY (kN m–2)
130°CControl28.26.4 ± 1.6a0.31 ± 0.00d4.7c11.6 ± 0.2ab3.35a11.8 ± 4.91.30 ± 0.41a4.1 ± 1.7c
10% LE27.85.8 ± 0.0ab0.33 ± 0.00c4.5c13.2 ± 1.4a3.48a10.5 ± 5.01.34 ± 0.46a4.9 ± 1.9c
30% LE28.84.7 ± 0.7bc0.28 ± 0.00e5.3bc10.4 ± 1.2bc3.70a18.7 ± 6.51.21 ± 0.18a7.7 ± 2.7c
10% GE30.15.6 ± 0.3b0.30 ± 0.00d6.1ab7.7 ± 1.1d3.74a25.3 ± 9.90.80 ± 0.19b15.3 ± 4.3bc
30% GE30.64.6 ± 0.1bc0.26 ± 0.01f6.2ab7.9 ± 0.9cd2.86b15.7 ± 2.30.71 ± 0.29b11.5 ± 5.6bc
160°CControl21.42.8 ± 0.0d0.16 ± 0.00h6.2ab8.7 ± 0.7cd2.70b19.2 ± 5.70.76 ± 0.08b26.5 ± 5.5abc
10% LE20.33.6 ± 0.3cd0.21 ± 0.00g6.0ab9.6 ± 2.3c2.90b15.9 ± 5.20.90 ± 0.27ab18.9 ± 7.7bc
30% LE24.33.0 ± 0.1d0.17 ± 0.00h6.8a7.5 ± 1.1d2.65b21.7 ± 6.20.70 ± 0.19b38.8 ± 21.2a
10% GE24.46.9 ± 0.7a0.54 ± 0.00a5.2bc9.0 ± 0.6cd2.82b17.2 ± 9.40.97 ± 0.35ab17.9 ± 3.2bc
30% GE30.17.1 ± 1.1a0.51 ± 0.00a6.2ab8.2 ± 1.5cd2.48b23.3 ± 14.20.98 ± 0.46ab33.0 ± 34.4ab
LSD0.05P >1.50.011.11.80.43P >0.4519.2

Values in the column followed by different letters are significantly different (P < 0.05). P > indicates that no significant difference was found according to ANOVA. References: WL: weight loss during baking (%); M: moisture (%); aw: water activity; sf: spread factor; V: volume (cm3); T4: the height of four biscuits that are stacked on top of each other. Texture parameters calculated from the three-point-bending test: σ: fracture stress (kN m–2); ε: fracture strain (dimensionless); Y: Young’s modulus (kN m–2). No significant differences were found in the fracture stress (σ) of all biscuits (P > 0.05). GE: geranium extract; LE: lemon verbena extract.