Changes in oil-in-water emulsion size distribution during the atomization step in spray-drying encapsulation

Munoz-Ibanez, Marta; Azagoh, Christiane; Dubey, Bipro; Dumoulin, Élisabeth; Turchiuli, Christelle

doi:10.1016/j.jfoodeng.2015.02.008

Cited by 47 publications

(20 citation statements)

References 24 publications

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“…According to Jafari et al (2008), small oil droplets will be entrapped more efficiently within the wall material matrix, and the emulsion will also be more stable during the atomization and drying processes. The larger the oil droplets are, the greater the breakup during atomization of the emulsion in the spray dryer chamber changing the size distribution (Munoz-Obanez et al, 2015). This breakup of the emulsion favors the increase in of the surface oil, decreasing the encapsulation efficiency (Soottitantawat et al, 2003).…”

Section: Surface Oil Content Oil Retention and Encapsulation Efficiencymentioning

confidence: 99%

Microencapsulation of grape seed oil by spray drying

2018

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On the search for alternative wall materials to replace gum Arabic (GA), a good but expensive encapsulating agent, this work aimed to evaluate the effectiveness of maltodextrin 10DE in combination with GA (GA/MD, 50:50 ratio) for the microencapsulation of grape seed oil by spray drying. The addition of maltodextrin to gum Arabic did not influence the mean particle diameter, powder bulk density, encapsulation efficiency or the total oil retained in the microspheres. Although the oil encapsulated with GA showed greater retention of phenolic compounds after spray drying, the sample encapsulated with GA/MD had greater ferric reduction antioxidant power and DPPH radical scavenging activity, and a lower peroxide index.

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Section: Surface Oil Content Oil Retention and Encapsulation Efficiencymentioning

confidence: 99%

Microencapsulation of grape seed oil by spray drying

2018

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“…Nonetheless, for homogenization at 20 MPa, the surface oil ratio decreased from 5.4% to 1.79% when the amount of NC was increased from 3 wt% to 5 wt%. Munoz-Ibanez et al [34] showed the importance of estimating the capillary number in controlling the oil-droplet breakup under right atomization conditions and/or emulsion formation in a microencapsulation application. The homogenization procedure of the encapsulated SQ did not affect SQ retention but influenced the surface oil ratio of the encapsulated SQ powder.…”

Section: Physical Characteristicsmentioning

confidence: 99%

Effects of oil-droplet diameter on the stability of squalene oil in spray-dried powder

et al. 2016

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Effects of the oil-droplet diameter and emulsification with polymerized sodium caseinate (PNC) on the stability of squalene oil (SQ) retention in spray-dried powder were investigated. The SQ droplet diameter significantly affected the stability of the oil in spray-dried powders. The degradation behavior of SQ powders at 105 C was correlated using the Avrami equation. This oxidation mechanism may occur because of the propagative transfer of radical oxidation between oil-droplet particles. SQ emulsified with 5 wt% PNC and small oil droplets had better oxidative stability when compared with 3 wt% sodium caseinate (NC).

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“…Millions of atomised droplets in the order of micrometre (10-200 µm) create extensively large surface area, which makes it possible for drying in a very short time when exposed to hot air in the drying chamber [87,90]. Atomisation, however, involves subjecting the materials under intense shear stress in order to produce the required fine droplets which will subsequently be in direct contact with hot air [26,91].The main advantages of spray drying over other drying methods are short drying process (less than 30 s), flexibility in choice of particle size, and high quality product with no adverse effects as well as diversity and availability of machinery [92].…”

Section: Spray Dryingmentioning

confidence: 99%

Microorganism preservation by convective air-drying—A review

2017

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Newcastle University ePrints -eprint.ncl.ac.uk Tan DT, Poh PE, Chin SK. Microorganism preservation by convective air-drying-A review. AbstractAt present, microorganisms are mainly preserved by freeze drying. There is, however, lack of studies conducted on various cheaper yet promising convective air drying alternatives. Convective air drying has been proven to produce dried culture with comparable cell survival and final moisture content to that of freeze drying. This paper aims to draw an understanding to application and suitability of convective air drying which indludes spray-, oven, heat pump, fluidised bed, conveyor, and rotary drying to preserve microorganisms. The paper concludes that drying near ambient temperature and the addition of dehydration protectants are important to obtain satisfactory drying quality. ambient temperature and mild processing conditions [28]. Such condition is hypothesised to be favourable towards high cell survival of microorganisms [29].Majority of studies and reviews, however, largely revolve around freeze-drying and cryogenic preservation which are both costly [8,15,30,31]. Although convective air drying has been used to preserve many foodstuffs, research on its applicability for bacteria preservation is still limited [32][33][34][35][36]. This paper is aimed to critically review work on preservation of microbes; looking into the factors that will affect the cell viability in convective air drying and to suggest future directions on the use of convective air drying for microbial preservation. Methods for microorganism preservationWhile there are many means to preserve a desired culture of microorganisms, some methods might be more suitable than the other depending on the purpose of preservation. Based on applicability of the techniques, preservation methods can be distinguished into those that are limited to just laboratory scale and those that can be applied in industry, as some pilot techniques could be simple and reliable but are not scalable [15]. The key difference between laboratory and industrial scale is the amount of culture that needs to be salvaged [26]. For laboratory purposes, low cell survival is sufficient whereas large quantity (and therefore high cell survival) is required for industrial usage [15]. Typical laboratory preservation techniques include smearing and storing on agar or gelatine, cell immersion in paraffin oil, and the adsorption-desiccation of bacteria culture on filter-paper or on pre-dried plugs of starch or silica gel [15,37,38].High number of successfully preserved viable cells is particularly important to ensure possible direct inoculation to the process fluid where the bacterial culture is to be utilised [11]. The laboratory preservation methods mentioned above are unsuitable due to the complexity of the process, requirement of additives, and low recovery rate [15]. Preservation methods which are recognised to be practical for industrial use are subcultivation, freezing, and drying [39,40].

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Changes in oil-in-water emulsion size distribution during the atomization step in spray-drying encapsulation

Cited by 47 publications

References 24 publications

Microencapsulation of grape seed oil by spray drying

Microencapsulation of grape seed oil by spray drying

Effects of oil-droplet diameter on the stability of squalene oil in spray-dried powder

Microorganism preservation by convective air-drying—A review

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