Effects of extrusion conditions and nitrogen injection on physical, mechanical, and microstructural properties of red lentil puffed snacks
| Autor: | Chyngyz Erkinbaev, Filiz Koksel, Jitendra Paliwal, Mustafa Tugrul Masatcioglu, Siwen Luo, Elyssa Chan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
Materials science Moisture General Chemical Engineering chemistry.chemical_element 04 agricultural and veterinary sciences Die swell Microstructure 040401 food science 01 natural sciences Biochemistry Nitrogen 0404 agricultural biotechnology chemistry Blowing agent 010608 biotechnology Extrusion Texture (crystalline) Composite material Water content Food Science Biotechnology |
| Zdroj: | Food and Bioproducts Processing. 121:143-153 |
| ISSN: | 0960-3085 |
| Popis: | Purpose Red lentils are rich in proteins and fibres, and thus have great potential to be used as healthy ingredients in extruded snacks. However, at high protein and fibre concentrations, the level of expansion, microstructure uniformity and textural appeal are impaired. Using physical blowing agents during extrusion can overcome these quality issues. This study investigates the effects of moisture content (18%–22%), screw speed (150 rpm–200 rpm), and blowing agent (i.e., N2) injection pressure (0−500 kPa) on physical, mechanical and microstructural properties of puffed red lentil snacks. Principle results Compared to conventional extrusion, N2 injection at 300 kPa decreased extrudate density from 0.25 to 0.41 kg/m3 to 0.12 to 0.26 kg/m3 (across all feed moistures and screw speeds studied), and substantially altered the extrudate’s microstructure. Extrudates with N2 injection had numerous small cells that were more evenly distributed. Moreover, an increase in feed moisture from 18% to 22% increased extrudate hardness and decreased crispiness. Major conclusions N2 injection during extrusion has a great potential in manipulating extrudate expansion, microstructure, texture, and colour of red lentil extrudates. Extrudates produced with 300 kPa N2 injection pressure had the maximum expansion compared to other N2 injection pressures studied. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect