Purified protein glutaminase from Chryseobacterium proteolyticum enhances the properties of wheat gluten
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View abstract on PubMed
Summary
This summary is machine-generated.Researchers enhanced protein glutaminase (PG) production from Chryseobacterium proteolyticum, achieving a 121% yield increase. This optimized PG significantly improved wheat gluten
Area Of Science
- Biotechnology
- Enzymology
- Food Science
Background
- Protein glutaminase (PG) from Chryseobacterium proteolyticum modifies plant proteins by deamidating glutamine to glutamic acid, enhancing functional properties.
- Low yields of PG hinder its industrial application and widespread use in food processing.
- Optimizing PG production is crucial for leveraging its benefits in food ingredient modification.
Purpose Of The Study
- To optimize the production yield of protein glutaminase (PG) from Chryseobacterium proteolyticum TM1040.
- To purify PG and evaluate its efficacy in deamidating wheat gluten.
- To assess the impact of PG-mediated deamidation on the functional properties of wheat gluten for food applications.
Main Methods
- Medium optimization and fermentation in a 15 L fermenter to increase PG yield.
- Purification of PG using sequential cation exchange chromatography (CEX) and hydrophobic interaction chromatography (HIC).
- Deamidation of wheat gluten using purified PG, followed by characterization of its functional properties (emulsifying, foaming, water/oil holding).
Main Results
- PG yield increased by 121% to 7.30 U/mL after medium optimization.
- Wheat gluten deamidation achieved a high degree of deamidation (DD) of 87.11% using purified PG, surpassing chemical methods in safety and efficacy.
- Deamidated wheat gluten exhibited significantly enhanced emulsifying (2.67x), foaming (18.86x), water-holding (4.23x), and oil-holding (18.77x) properties.
Conclusions
- Medium optimization and purification strategies successfully enhanced PG production and yield.
- PG is a safe and effective enzyme for improving wheat gluten functionality, offering superior results compared to chemical deamidation.
- The enhanced functional properties of deamidated wheat gluten demonstrate its potential for improving texture and flavor in baked goods, particularly cakes.
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