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Solid lipid microparticles loaded with cinnamon oleoresin: Characterization, stability and antimicrobial activity
Fernanda Ramalho Procopio1, Vivian Boesso Oriani1, Bruno Nicolau Paulino2
1Laboratory of Process Engineering, Department of Food Engineering, School of Food Engineering, University of Campinas, CEP 13083-862 Campinas, SP, Brazil.
Food Research International (Ottawa, Ont.)
|September 10, 2018
Summary
This study developed stable microparticles of cinnamon bark oleoresin (CO) using spray chilling. These microparticles effectively retained volatile compounds and enhanced antimicrobial activity against fungi and bacteria during storage.
Area of Science:
- Food Science
- Material Science
- Microbiology
Background:
- Cinnamon bark oleoresin (CO) possesses antimicrobial properties but is prone to degradation.
- Developing stable delivery systems for CO is crucial for its application as a natural antimicrobial agent.
- Spray chilling offers a method for encapsulating sensitive compounds like CO into microparticles.
Purpose of the Study:
- To produce and characterize solid lipid microparticles (SLM) loaded with CO using the spray chilling technique.
- To evaluate the stability and antimicrobial efficacy of CO-loaded SLM under different storage conditions.
- To investigate the influence of carrier materials (Hardfat and palm oil) and CO concentration on microparticle properties.
Main Methods:
- Production of SLM using spray chilling with Hardfat (PH) and palm oil (PO) as carriers at various ratios (100:0, 80:20, 60:40) and CO concentrations (1%, 2%).
- Characterization of SLM including particle size, polymorphism, volatile compound retention, and antimicrobial activity over 28 days at 25°C and 45°C.
- Analysis of major volatile components in CO, including cinnamaldehyde (Cn), O-methoxy cinnamaldehyde (OmCn), and coumarin (Co).
Main Results:
- SLM exhibited a mean particle size ranging from 8-72 μm, with most formulations showing the polymorphic form β'.
- The formulation with 100% PH and 2% CO demonstrated superior retention of volatile compounds.
- Formulations with 80:20 and 60:40 PH:PO ratios and 2% CO showed enhanced stability of cinnamaldehyde during storage.
- Antimicrobial activity against Candida pseudointermedia and Penicillium paneum increased over the 28-day storage period.
Conclusions:
- Spray chilling is an effective method for producing CO-loaded SLM with improved stability and antimicrobial properties.
- The choice of carrier material and CO concentration significantly impacts the characteristics and performance of the microparticles.
- CO-loaded SLM show potential as natural antimicrobial agents with enhanced efficacy and stability for food applications.
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