Effect of fiber sources on fatty acids profile, glycemic index, and phenolic compound content of in vitro digested fortified wheat bread
In this study, some dietary fiber (DF) sources were investigated as fortifiers of wheat bread: oat (OB), flax (FB), and apple (AB). Adding oat and flax fibers to bread significantly changed the fatty acid profiles. OB was highest in oleic acid (33.83% of lipids) and linoleic acid (24.31% of lipids). Only in FB, γ-linolenic fatty acid was present in a significant amount—18.32%. The bioaccessibility trails revealed that the DF slow down the intake of saturated fatty acids. PUFA were least bioaccessible from all fatty acids groups in the range of (72% in OB to 87% in FB). The control bread had the greatest value (80.5) and was significantly higher than values for OB, FB, and AB in terms of glycemic index. OB, FB and AB addition led to obtain low glycemic index. AB had a significant highest value of total phenolic (897.2 mg/kg) with the lowest values in FB (541.2 mg/kg). The only significant lowering of caloric values in this study was observed in AB. The study could address the gap in the area of research about taking into consideration glycemic index, fatty acid profile and phenolic content in parallel in terms of DF application in breads.
KeywordsDietary fiber Fatty acids GC Wheat bread
- Gervais R, Gagnon F, Kheadr EE, Van Calsteren MR, Farnworth ER, Fliss I, Chouinard PY (2009) Bioaccessibility of fatty acids from conjugated linoleic acid-enriched milk and milk emulsions studied in a dynamic in vitro gastrointestinal model. Int Dairy J 19:574–581. https://doi.org/10.1016/j.idairyj.2009.05.001 CrossRefGoogle Scholar
- Meral R, Dogan IS (2013) Quality and antioxidant activity of bread fortified with flaxseed. Ital J Food Sci 25:51–56Google Scholar
- Ribeiro LF, Peralta-Zamora PG, Maia BHLNS et al (2013) Prediction of linolenic and linoleic fatty acids content in flax seeds and flax seeds flours through the use of infrared reflectance spectroscopy and multivariate calibration. Food Res Int 51:848–854. https://doi.org/10.1016/j.foodres.2013.01.061 CrossRefGoogle Scholar