Wheat Pasta Enriched with Green Coffee Flour: Physicochemical, Antioxidant and Sensory Properties

This study aimed to evaluate the impact of green coffee flour (GCF) addition (2-8%) and drying method (convective versus microwave-vacuum drying) on the physicochemical, textural, and bioactive properties of pasta. Both factors were found to significantly influence the assessed parameters. Green coffee had no observable effect on the microstructure of convectively dried pasta, whereas microwave-vacuum drying caused visible cracks and a heterogeneous starch-protein matrix even at a 2% supplementation level. Microwave-vacuum-dried pasta exhibited a shorter optimal cooking time and higher water absorption compared with convectively dried samples, while increasing the level of GCF prolonged cooking time and increased cooking losses. Texture analysis revealed that convectively dried pasta showed decreased elasticity and cohesiveness with increasing GCF content, whereas microwave -vacuum-dried pasta maintained a relatively uniform texture regardless of supplementation. The incorporation of GCF enhanced the antioxidant capacity of pasta, with the most pronounced effect at 2% addition, while higher levels showed reduced benefits. Similarly, fortification increased the content of phenolic acids, particularly chlorogenic acid and its isomers, with convectively dried samples exhibiting higher levels than microwave-vacuum-dried pasta. Consumer acceptance was highest for convectively dried pasta without GCF and for samples containing 2%, while pasta with higher GCF levels or microwave-vacuum-dried samples received lower scores.