Effect of faults on stability of partially saturated rock slope
- Authors: You, Greg , Jaggi, Nav , Al Mandalawi, Maged , Dowling, Kim , Dahlhaus, Peter
- Date: 2019
- Type: Text , Book
- Relation: Deep Rock Mechanics : From Research to Engineering
- Full Text: false
- Reviewed:
- Description: The effect of three faults on the slope stability was studied for the Stage 1 open pit in an open cut mine in Australia. The faults were treated as joints using Barton's method, and the slope was under dry and partially saturated conditions. A finite element program in RocScience was used in the study, where the generalized Hoek-Brown criterion was employed for rock mass and the Mohr-coulomb criterion for the faults. It is found that the factor of safety of the slope decreased with the introduction of the fault structures. Furthermore, the fault structures created higher stress concentrations zones at the ends of the faults.
Finite element analysis of rock slope stability using shear strength reduction method
- Authors: You, Greg , Al Mandalawi, Maged , Soliman, Ahmed , Dowling, Kim , Dahlhaus, Peter
- Date: 2017
- Type: Text , Conference proceedings
- Relation: 1st GeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures; Sharm El Sheikh, Egypt;15th-19th July 2017; published in Soil Testing, Soil Stability and Ground Improvement : Proceedings of the 1st GeoMEast International Congress and Exhibition, Egypt 2017 on Sustainable Civil Infrastructures (part of the Sustainable Civil Infrastructures book series) p. 227-235
- Full Text: false
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- Description: Finite element analysis incorporating the shear strength reduction method was applied to study the west slope stability of an open cut mine in Australia using Mohr–Coulomb and generalized Hoek–Brown criteria. The pit of the mine had multiphase excavations and reached 180 m in depth. The study investigated three slope configurations, namely, Stage 1 inter ramp slope 43°, Stage 2 inter ramp slope 49° and optimized Stage 2 slope 54°. When implementing the generalized Hoek–Brown failure criterion, the equivalent factor of safety was 1.96, 1.87 and 1.40 under dry slope for the three configurations, respectively. However, under partly saturated conditions, the optimised slope would have a factor of safety 1.16. Furthermore, the generalised Hoek–Brown criterion generated lower factors of safety than the Mohr–Coulomb failure criterion. The difference is related to an overestimation of the shear strength parameters by the linear Mohr–Coulomb criterion under low confining stresses compared with the non-linear Hoek–Brown.
Seasonal changes in arsenic concentrations and hydrogeochemistry of Canadian Creek, Ballarat (Victoria, Australia)
- Authors: Sultan, Khawar , Dowling, Kim
- Date: 2006
- Type: Text , Journal article
- Relation: Water, Air, and Soil Pollution Vol. 169, no. 1-4 (2006), p. 355-374
- Full Text: false
- Reviewed:
- Description: A 10-month study of surface waters in Canadian Creek (Ballarat, Victoria, Australia) showed the significant influence of historic gold mining waste material. The investigation focussed on the hydrogeochemistry of the surface waters and soils in order to: (1) document the levels and seasonal trends in major, minor and trace elements in the creek, (2) identify the process by which As is released from the soil/waste mining material to surface waters. For most dissolved major and trace elements (Na, Ca, Mg, K, and As) in surface waters, the concentrations decreased with the increasing rainfall and flow conditions except for Al and Fe. Two sites selected along the creek (<1 km apart) allowed evaluation of the possibility that mining waste material is contributing to the elevated As concentrations (up to 145
- Description: C1
- Description: 2003001958
Arsenic and major cation hydrogeochemistry of the Central Victorian (Australia) surface waters
- Authors: Sultan, Khawar , Dowling, Kim
- Date: 2006
- Type: Text , Journal article
- Relation: Journal of Environmental Sciences Vol. 18, no. 1 (2006), p. 184-192
- Full Text: false
- Reviewed:
- Description: This paper reports on the major cations (Ca, Mg, Na and K) and arsenic (As) compositions of surface waters collected from major creeks, rivers and lakes in Central Victoria (Australia). The surface waters were found to be neutral to alkaline (pH 6.7-9.4), oxidised (average redox potential (Eh) about 130 mV) and showed variable concentrations of dissolved ions (EC, about 51-4386
- Description: C1
- Description: 2003002078
Conceptual design of a Submersible Remotely Operated Swimming Dredger (SROSD)
- Authors: Sarkar, Mridul , Bose, Neil , Chai, Shuhong , Dowling, Kim
- Date: 2011
- Type: Text , Conference proceedings
- Full Text: false
- Description: Increasing use of deep-water dredging and mining vehicles has been anticipated for resource collection, engineering construction and environmental protection. Existing deep-dredging or mining equipment can be classified as i) diver-assisted dredging tools, ii) surfacefloating dredgers with deep-dredging capability and iii) submersible dredgers. Diver assisted dredging tools have limited capacity and involve human risk. Surface floating dredgers can work to a specific dredging depth controlled by their ladder length, but modification is limited by their large size and significant cost. Submersible dredgers are deployed for sub-sea operations and are the focus of this research. Submersible crawlers and walkers work in a submerged terrain-contact condition and depend on their apparent weight and ground reactions to counteract the excavation forces. Crawlers are inefficient in negotiating difficult subsea terrain and walking submersibles are slow moving over long-distances. Considering the constraints of dredging depth, negotiation of uneven terrain, slow motion, interchange ability of excavation or transport sub-system components and station keeping during operation, a new type of submersible dredger or miner was conceived. In working mode, it imitates a walking motion by spuds that are also used for station keeping during dredging. For longdistance travel, the vehicle can swim by means of vector thrusters. The vector thrusters also help in position-keeping and motion-control during swimming. To offset higher forces generated during excavation of hard materials, spuds, variable buoyancy tanks and control planes are included as secondary station-keeping devices. The paper describes the general arrangement and the distinguished sub-systems of the conceptualised vehicle. Special attention was given to working and swimming locomotion and the methods of station keeping during operation. Investigations about the station-keeping, propulsion and controlling conditions of the vehicle are in progress. Experiments to measure the cutting forces from the cutter design are described. It is expected that the new design will significantly contribute to the evolution of existing deep-dredging equipment with improved efficiency, increased mobility and location control while minimising larger environmental disturbances. Copyright © 2011 by ASME.
Turbidity caused by spillage from a dredging/mining transverse axis cutter
- Authors: Sarkar, Mridul , Bose, Neil , Sarkar, Sritama , Dowling, Kim
- Date: 2013
- Type: Text , Conference paper
- Relation: 20th World dredging congress and exhibition 2013 (WODCON XX): The art of dredging p. 636-645
- Full Text: false
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Discussions on locomotion and excavation systems of 'SROSD II' : A new concept of submersible dredger
- Authors: Sarkar, Mridul , Sarkar, Sritama , Bose, Neil , Chai, Shuhong , Dowling, Kim
- Date: 2015
- Type: Text , Conference proceedings
- Full Text: false
- Description: Different types of submersible dredgers are conceived, modeled and even some prototype and full-scale vehicles are built for prospective subsea excavation purposes by various researchers and commercial companies. Most common type of submersible dredgers is tracked vehicle. Walking submersible dredgers are also available which can be further subdivided into passive legged systems (locomotion performed by moving frames) and active legged systems (locomotion performed by individually controlled legs). An Archimedian screw system is also conceived for a subsea mining vehicle. Continuous ground contact is necessary for tracks and Archimedan screw types of locomotion systems. Legged locomotion also requires intermittent contact with the terrain. Generation of adequate friction for locomotion purposes in very soft cohesive sediments or submerged rocky terrain is often critical. In soft cohesive terrain, the vehicle can capsize due to insufficient bearing capacity. Additional ground contact forces are necessary to counteract the excavation and environmental forces. In low-friction and/or low bearing capacity subsea terrains, achieving the force balance for the stability of the above mentioned submersible dredgers can thus be difficult. Also, the subsea terrain can be uneven with steep slopes and can be unchartered. Hence, a conceptual design of a submersible remotely-operated swimming dredger (SROSD II) is conceived. The SROSD II can swim with the aid of multiple control planes and thruster system in order to avoid difficult subsea terrains. For disjointed working areas, SROSD II can swim and thus can significantly reduce the non-working time. During excavation, SROSD II can anchor itself with the help of hydraulically actuated spuds. The anchored spuds and the thrusters can provide the necessary reaction forces to counteract the excavation and environmental forces. Unlike other submersible vehicles, the SROSD II is an almost neutrally buoyant system. In this paper the general arrangement of the SROSD II, the proposed locomotion and excavation systems are discussed. A simplified model for position keeping during excavation is also presented. © 2015 IEEE.
Cancer incidence and arsenic in soil in a gold mining area of Australia
- Authors: Pearce, Dora , Dowling, Kim , Sim, Malcolm
- Date: 2008
- Type: Text , Journal article
- Relation: Epidemilogy Vol. 19, no. 6 (2008), p. S165-S165
- Full Text: false
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Toenails : They know where you’ve been!
- Authors: Pearce, Dora , Dowling, Kim , Sim, Malcolm , McOrist, Gordon , Russell, Robert
- Date: 2007
- Type: Text , Conference paper
- Relation: Nuclear and Complementary Techniques of Analysis (NCTA) Conference Abstracts volume, Melbourne
- Full Text: false
- Description: 2003006916
Arsenic microdistribution and speciation in toenail clippings of children living in a historic gold mining area
- Authors: Pearce, Dora , Dowling, Kim , Gerson, Andrea , Sim, Malcolm , Sutton, Stephen , Newville, Matthew , Russell, Robert , McOrist, Gordon
- Date: 2010
- Type: Text , Journal article
- Relation: Science of the Total Environment Vol. 408, no. 12 (2010), p. 2590-2599
- Full Text:
- Reviewed:
- Description: Arsenic is naturally associated with gold mineralisation and elevated in some soils and mine waste around historical gold mining activity in Victoria, Australia. To explore uptake, arsenic concentrations in children's toenail clippings and household soils were measured, and the microdistribution and speciation of arsenic in situ in toenail clipping thin sections investigated using synchrotron-based X-ray microprobe techniques. The ability to differentiate exogenous arsenic was explored by investigating surface contamination on cleaned clippings using depth profiling, and direct diffusion of arsenic into incubated clippings. Total arsenic concentrations ranged from 0.15 to 2.1
Cancer incidence and soil arsenic exposure in a historical gold mining area in Victoria, Australia : A geospatial analysis
- Authors: Pearce, Dora , Dowling, Kim , Sim, Malcolm
- Date: 2012
- Type: Text , Journal article
- Relation: Journal of Exposure Science and Environmental Epidemiology Vol. 22, no. 3 (2012), p. 248-257
- Full Text:
- Reviewed:
- Description: Soil and mine waste around historical gold mining sites may have elevated arsenic concentrations. Recent evidence suggests some systemic arsenic absorption by residents in the goldfields region of Victoria, Australia. Victorian Cancer Registry and geochemical data were accessed for an ecological geographical correlation study, 1984-2003. Spatial empirical Bayes smoothing was applied when estimating standardised incidence ratios (SIRs) for cancers in 61 statistical local areas. The derived soil arsenic exposure metric ranged from 1.4 to 1857 mg/kg. Spatial autoregressive modelling detected increases in smoothed SIRs for all cancers of 0.05 (95% confidence interval (CI), 0.02-0.08) and 0.04 (0.01-0.07) per 2.7-fold increase in the natural log-transformed exposure metric for males and females, respectively, in more socioeconomically disadvantaged areas; for melanoma in males (0.05 (0.01-0.08) adjusted for disadvantage) and females (0.05 (0.02-0.09) in disadvantaged areas). Excess risks were estimated for all cancers (relative risk 1.21 (95% CI, 1.15-1.27) and 1.08 (1.03-1.14)), and melanoma (1.52 (1.25-1.85) and 1.29 (1.08-1.55)), for males and females, respectively, in disadvantaged areas in the highest quintile of the exposure metric relative to the lowest. Our findings suggest small but significant increases in past cancer risk associated with increasing soil arsenic in socioeconomically disadvantaged areas and demonstrate the robustness of this geospatial approach. Journal of Exposure Science and Environmental Epidemiology advance online publication, 21 March 2012.
Ongoing soil arsenic exposure of children living in an historical gold mining area in regional Victoria, Australia: Identifying risk factors associated with uptake
- Authors: Martin, Rachael , Dowling, Kim , Pearce, Dora , Bennett, John , Stopic, Attila
- Date: 2013
- Type: Text , Journal article
- Relation: Journal of Asian Earth Sciences Vol. 77, no. (2013), p. 256-261
- Full Text: false
- Reviewed:
- Description: Elevated levels of arsenic have been observed in some mine wastes and soils around historical gold mining areas in regional Victoria, Australia. Arsenic uptake from soil by children living in these areas has been demonstrated using toenail arsenic concentration as a biomarker, with evidence of some systemic absorption associated with periodic exposures. We conducted a follow-up study to ascertain if toenail arsenic concentrations, and risk factors for exposure, had changed over a five year period in an historical gold mining region in western regional Victoria, Australia. Residential soil samples (N= 14) and toenail clippings (N= 24) were analyzed for total arsenic using instrumental neutron activation analysis, including 19 toenail clippings samples that were obtained from the same study cohort in 2006. Toenail arsenic concentrations in 2011 (geometric mean, 0.171. μg/g; range, 0.030-0.540. μg/g) were significantly lower than those in 2006 (geometric mean, 0.464. μg/g; range, 0.150-2.10. μg/g; p<. 0.001). However, toenail arsenic concentrations were again correlated with soil arsenic levels (Spearman's rho= 0.630; p= 0.001). Spending time outdoors more often and for longer periods correlates with increased arsenic uptake (p< 0.05). Mining-influenced residential soils represent a long-term continuing source for potential arsenic exposure for children living in this historical mining region. © 2013.
- Description: C1
Trace metal contamination of mineral spring water in an historical mining area in regional Victoria, Australia
- Authors: Martin, Rachael , Dowling, Kim
- Date: 2013
- Type: Text , Journal article
- Relation: Journal of Asian Earth Sciences Vol. 77, no. (2013), p. 262-267
- Full Text: false
- Reviewed:
- Description: Significant global consumption of spring and mineral water is fuelled by perceived therapeutic and medicinal qualities, cultural habits and taste. The Central Victorian Mineral Springs Region, Australia comprises approximately 100 naturally effervescent, cold, high CO2 content springs with distinctive tastes linked to a specific spring or pump. The area has a rich settlement history. It was first settled by miners in the 1840s closely followed by the first commercial operations of a health resort 1895. The landscape is clearly affected by gold mining with geographically proximal mine waste, mullock heaps or tailings. Repeated mineral springs sampling since 1985 has revealed elevated arsenic concentrations. In 1985 an arsenic concentration five times the current Australian Drinking Water Guideline was recorded at a popular tourist spring site. Recent sampling and analyses have confirmed elevated levels of heavy metals/metalloids, with higher concentrations occurring during periods of low rainfall. Despite the elevated levels, mineral water source points remain accessible to the public with some springs actively promoting the therapeutic benefits of the waters.In light of our analysis, the risk to consumers (some of whom are likely to be negatively health-affected or health-compromised) needs to be considered with a view to appropriate and verified analyses made available to the public. © 2013.
- Description: C1
Size-dependent characterisation of historical gold mine wastes to examine human pathways of exposure to arsenic and other potentially toxic elements
- Authors: Martin, Rachael , Dowling, Kim , Pearce, Dora , Florentine, Singarayer , Bennett, John , Stopic, Attila
- Date: 2016
- Type: Text , Journal article
- Relation: Environmental Geochemistry and Health Vol. 38, no. 5 (2016), p. 1097-1114
- Full Text: false
- Reviewed:
- Description: Abandoned historical gold mining wastes often exist as geographically extensive, unremediated, and poorly contained deposits that contain elevated levels of As and other potentially toxic elements (PTEs). One of the key variables governing human exposure to PTEs in mine waste is particle size. By applying a size-resolved approach to mine waste characterisation, this study reports on the proportions of mine waste relevant to human exposure and mobility, as well as their corresponding PTE concentrations, in four distinct historical mine wastes from the gold province in Central Victoria, Australia. To the best of our knowledge, such a detailed investigation and comparison of historical mining wastes has not been conducted in this mining-affected region. Mass distribution analysis revealed notable proportions of waste material in the readily ingestible size fraction (aecurrency sign250 A mu m; 36.1-75.6 %) and the dust size fraction (aecurrency sign100 A mu m; 5.9-45.6 %), suggesting a high potential for human exposure and dust mobilisation. Common to all mine waste types were statistically significant inverse trends between particle size and levels of As and Zn. Enrichment of As in the finest investigated size fraction (aecurrency sign53 A mu m) is of particular concern as these particles are highly susceptible to long-distance atmospheric transport. Human populations that reside in the prevailing wind direction from a mine waste deposit may be at risk of As exposure via inhalation and/or ingestion pathways. Enrichment of PTEs in the finer size fractions indicates that human health risk assessments based on bulk contaminant concentrations may underestimate potential exposure intensities.
In vitro assessment of arsenic mobility in historical mine waste dust using simulated lung fluid
- Authors: Martin, Rachael , Dowling, Kim , Nankervis, Scott , Pearce, Dora , Florentine, Singarayer , McKnight, Stafford
- Date: 2018
- Type: Text , Journal article
- Relation: Environmental Geochemistry and Health Vol. 40, no. 3 (2018), p. 1037-1049
- Full Text: false
- Reviewed:
- Description: Exposure studies have linked arsenic (As) ingestion with disease in mining-affected populations; however, inhalation of mine waste dust as a pathway for pulmonary toxicity and systemic absorption has received limited attention. A biologically relevant extractant was used to assess the 24-h lung bioaccessibility of As in dust isolated from four distinct types of historical gold mine wastes common to regional Victoria, Australia. Mine waste particles less than 20 µm in size (PM20) were incubated in a simulated lung fluid containing a major surface-active component found in mammalian lungs, dipalmitoylphosphatidylcholine. The supernatants were extracted, and their As contents measured after 1, 2, 4, 8 and 24 h. The resultant As solubility profiles show rapid dissolution followed by a more modest increasing trend, with between 75 and 82% of the total 24-h bioaccessible As released within the first 8 h. These profiles are consistent with the solubility profile of scorodite, a secondary As-bearing phase detected by X-ray diffraction in one of the investigated waste materials. Compared with similar studies, the cumulative As concentrations released at the 24-h time point were extremely low (range 297 ± 6–3983 ± 396 µg L−1), representing between 0.020 ± 0.002 and 0.036 ± 0.003% of the total As in the PM20.
Health effects associated with inhalation of airborne arsenic arising from mining operations
- Authors: Martin, Rachael , Dowling, Kim , Pearce, Dora , Sillitoe, Jim , Florentine, Singarayer
- Date: 2014
- Type: Text , Journal article
- Relation: Geosciences (Switzerland) Vol. 4, no. 3 (2014), p. 128-175
- Full Text:
- Reviewed:
- Description: Arsenic in dust and aerosol generated by mining, mineral processing and metallurgical extraction industries, is a serious threat to human populations throughout the world. Major sources of contamination include smelting operations, coal combustion, hard rock mining, as well as their associated waste products, including fly ash, mine wastes and tailings. The number of uncontained arsenic-rich mine waste sites throughout the world is of growing concern, as is the number of people at risk of exposure. Inhalation exposures to arsenic-bearing dusts and aerosol, in both occupational and environmental settings, have been definitively linked to increased systemic uptake, as well as carcinogenic and non-carcinogenic health outcomes. It is therefore becoming increasingly important to identify human populations and sensitive sub-populations at risk of exposure, and to better understand the modes of action for pulmonary arsenic toxicity and carcinogenesis. In this paper we explore the contribution of smelting, coal combustion, hard rock mining and their associated waste products to atmospheric arsenic. We also report on the current understanding of the health effects of inhaled arsenic, citing results from various toxicological, biomedical and epidemiological studies. This review is particularly aimed at those researchers engaged in the distinct, but complementary areas of arsenic research within the multidisciplinary field of medical geology. © 2014 by the authors; licensee MDPI, Basel, Switzerland.
Preparation, characterization and functional properties of flax seed protein isolate
- Authors: Kaushik, Pratibha , Dowling, Kim , McKnight, Stafford , Barrow, Colin , Wang, Bo , Adhikari, Benu
- Date: 2016
- Type: Text , Journal article
- Relation: Food Chemistry Vol. 197, no. (2016/04/15/ 2016), p. 212-220
- Full Text: false
- Reviewed:
- Description:
Flaxseed protein isolate (FPI) was extracted from flaxseeds, and its amino acid composition and functional properties (solubility, thermal stability, emulsifying properties and electrostatic charge density, water holding and fat absorption capacities) were determined. The highest purity of FPI (90.6%) was achieved by extraction at 60°C. FPI had a low lysine to arginine ratio of 0.25, which is desired in heart-healthy foods and infant formulas. The denaturation temperature of FPI was 105°C. FPI had the highest emulsion activity index (375.51m2/g), highest emulsion stability index (179.5h) and zeta potential (−67.4mV) when compared to those of other commonly used proteins, such as sodium caseinate (SC), whey protein isolate (WPI), gelatin (Gel) and soy protein isolate (SPI). The average emulsion droplet size of emulsions stabilized by these proteins was in the order SC
Complex coacervation between flaxseed protein isolate and flaxseed gum
- Authors: Kaushik, Pratibha , Dowling, Kim , Barrow, Colin , Adhikari, Benu
- Date: 2015
- Type: Text , Journal article
- Relation: Food Research International Vol. 72, no. (2015), p. 91-97
- Full Text:
- Reviewed:
- Description:
Flaxseed protein isolate (FPI) and flaxseed gum (FG) were extracted, and the electrostatic complexation between these two biopolymers was studied as a function of pH and FPI-to-FG ratio using turbidimetric and electrophoretic mobility (zeta potential) tests. The zeta potential values of FPI, FG, and their mixtures at the FPI-to-FG ratios of 1:1, 3:1, 5:1, 10:1, 15:1 were measured over a pH range 8.0-1.5. The alteration of the secondary structure of FPI as a function of pH was studied using circular dichroism. The proportion of a-helical structure decreased, whereas both β-sheet structure and random coil structure increased with the lowering of pH from 8.0 to 3.0. The acidic pH affected the secondary structure of FPI and the unfolding of helix conformation facilitated the complexation of FPI with FG. The optimum FPI-to-FG ratio for complex coacervation was found to be 3:1. The critical pH values associated with the formation of soluble (pHc) and insoluble (pH
Φ1 ) complexes at the optimum FPI-to-FG ratio were found to be 6.0 and 4.5, respectively. The optimum pH (pHopt ) for the optimum complex coacervation was 3.1. The instability and dissolution of FPI-FG complex coacervates started (pHΦ2 ) at pH2.1. These findings contribute to the development of FPI-FG complex coacervates as delivery vehicles for unstable albeit valuable nutrients such as omega-3 fatty acids. © 2015.
Microencapsulation of omega-3 fatty acids : A review of microencapsulation and characterization methods
- Authors: Kaushik, Pratibha , Dowling, Kim , Barrow, Colin , Adhikari, Benu
- Date: 2015
- Type: Text , Journal article , Review
- Relation: Journal of Functional Foods Vol. 19, no. Part B (2015), p. 868-881
- Full Text: false
- Reviewed:
- Description: To improve consumption of omega-3 fatty acids, foods can be enriched with omega-3 rich oils. Microencapsulation of omega-3 oils minimizes oxidative deterioration and allows their use in stable and easy-to-handle form. Microencapsulation of omega-3 fatty acids can be achieved by using a variety of methods, with the two most commonly used commercial processes being complex coacervation and spray dried emulsions. A variety of other methods are in development including spray chilling, extrusion coating and liposome entrapment. The key parameter in any of these processes is the selection of wall material. For spray dried emulsions and complex coacervates protein or polysaccharides are primarily used as shell material, although complex coacervation is currently commercially limited to gelatin. Here we review the need for microencapsulation of omega-3 oils, methods of microencapsulation and analysis, and the selection of shell material components. In particular, we discuss the method of complex coacervation, including its benefits and limitations. This review highlights the need for research on the fundamentals of interfacial and complexation behaviour of various proteins, gums and polyphenols to encapsulate and deliver omega-3 fatty acids, particularly with regard to broadening the range of shell materials that can be used in complex coacervation of omega-3 rich oils. © 2014 Published by Elsevier Ltd. All rights reserved.
Microencapsulation of flaxseed oil in flaxseed protein and flaxseed gum complex coacervates
- Authors: Kaushik, Pratibha , Dowling, Kim , McKnight, Stafford , Barrow, Colin , Adhikari, Benu
- Date: 2016
- Type: Text , Journal article
- Relation: Food Research International Vol. 86, no. (2016), p. 1-8
- Full Text: false
- Reviewed:
- Description: Flaxseed oil, a rich source of omega-3 fatty acids, was microencapsulated in a novel matrix formed by complex coacervation between flaxseed protein isolate (FPI) and flaxseed gum (FG). This matrix was crosslinking with glutaraldehyde. Liquid microcapsules with three core (oil)-to-wall ratios (1:2, 1:3 and 1:4) were prepared and spray-dried or freeze-dried to produce powders. The microencapsulation efficiency, surface oil, morphology and oxidative stability of these microcapsules were determined. The spray-dried solid microcapsules had higher oil microencapsulation efficiency, lower surface oil content, smoother surface morphology and higher oxidation stability than the freeze-dried microcapsules. The highest microencapsulation efficiency obtained in spray-dried microcapsules was 87% with a surface oil of 2.78% at core-to-wall ratio 1:4 and oil load 20%. The oxidation stability obtained from spray-dried microcapsules at core-to-wall ratio of 1:4 was nearly double that of the unencapsulated flaxseed oil. © 2016 Elsevier Ltd.