Physical stabilities of taro starch nanoparticles stabilized Pickering emulsions and the potential application of encapsulated tea polyphenols
109
Citation
39
Reference
10
Related Paper
Citation Trend
Keywords:
Pickering emulsion
Zeta potential
Particle (ecology)
Zeta potential
Surface charge
Cite
Citations (33)
The use of chitosan as a flocculant has become a topic of interest over the years due to its positively charged polymer and biodegradable and non-toxic properties. However, most studies only focus on microalgae and wastewater treatment. This study provides crucial insight into the potential of using chitosan as an organic flocculant to harvest lipids and docosahexaenoic acid (DHA-rich Aurantiochytrium sp. SW1 cells by examining the correlation of flocculation parameters (chitosan concentration, molecular weight, medium pH, culture age, and cell density) toward the flocculation efficiency and zeta potential of the cells. A strong correlation between the pH and harvesting efficiency was observed as the pH increased from 3, with the optimal flocculation efficiency of >95% achieved at a chitosan concentration of 0.5 g/L at pH 6 where the zeta potential was almost zero (3.26 mV). The culture age and chitosan molecular weight have no effect on the flocculation efficiency but increasing the cell density decreases the flocculation efficiency. This is the first study to reveal the potential of chitosan to be used as a harvesting alternative for thraustochytrid cells.
Zeta potential
Cite
Citations (4)
When optimizing the dosage of flocculant by beaker-stirring experiment,its process is very numerous and time-consuming.So the optimization method of flocculant dosage by Zeta potential of the particles in sewage is established in this paper.For the sewage from one company of Daqing oilfield,the dosage of flocculant was optimized by measuring the relationship of Zeta potential and treatment effect of the sewage added flocculant at different concentration.It shows that both inorganic flocculant(polymeric aluminum chloride) and cationic organic macromolecule flocculant can cause Zeta potential shift toward positive value.Combining the two kinds of flocculants can decrease the total dosage of flocculants and improve flocculation effect.The closer to 0 Zeta potential is,the better the treatment effect will be.
Zeta potential
Cationic polymerization
Cite
Citations (0)
Flocculation of Candida Y-10 by self made flocculant was presented, which was shown to be better than other flocculants. The effects of environmental conditions on flocculation were also studied, and the optimum flocculation conditions were: pH=8.1, temperature 25℃, flocculant 16.6 g/L. Flocculation mechanism and dynamics was also discussed.
Cite
Citations (0)
In this study, we utilized different types of particles to stabilize β-carotene-loaded Pickering emulsions: spherical hydrophobic zein colloidal particles (ZCPs) (517.3 nm) and rod-shaped hydrophilic cellulose nanocrystals (CNCs) (115.2 nm). Either of the particles was incapable of stabilizing Pickering emulsions owing to their inappropriate wettability. When the mass ratio of ZCPs and CNCs was 1:4, the Pickering emulsion showed the best physical and photothermal stability. Compared to the ZCP-stabilized Pickering emulsion (9.29%), the retention rate of β-carotene in the Pickering emulsion costabilized by ZCPs and CNCs was increased to 60.23% after 28 days of storage at 55 °C. Confocal microscopy and cryoscanning electron microscopy confirmed that different types of particles could form a multilayered structure or induce the formation of an interparticle network. Furthermore, the complexation of ZCPs and CNCs delayed the lipolysis of the emulsion during in vitro digestion. The free fatty acid (FFA) release rate of Pickering emulsions in the small intestinal phase was reduced from 19.46 to 8.73%. Accordingly, the bioaccessibility of β-carotene in Pickering emulsions ranged from 9.14 to 27.25% through adjusting the mass ratio and addition sequence of distinct particles at the interface. The Pickering emulsion with the novel particle-particle complex interface was designed in foods and pharmaceuticals for purpose of enhanced stability, delayed lipolysis, or sustained nutrient release.
Pickering emulsion
Particle (ecology)
Cite
Citations (46)
The effect of changes in zeta potential on the flocculation of Klebsiella suspensions over the pH range from 4 to 9 was studied by using polyacrylamide(PAM)as flocculating agents.The results indicated that the zeta potential of Klebsiella cells depended on isoelectrical point,and was positive below pH 2.2 and negative in the pH range 4—9.In addition,the zeta potentials of non-ionic polyacrylamide(nPAM)and anionic polyacrylamide(aPAM)were negative as the pH varied in all cases,which led to electrostatic repulsion between negatively charged polymer and negatively charged Klebsiella surface.However,cationic polyacrylamide(cPAM)was strongly pH dependent,and the zeta potential of cPAM varied from positive to negative values with isoelectrical point at pH 8.From flocculation tests,it was seen that cPAM showed good flocculation separation of Klebsiella cells with flocculation ratio(FR) of 94.5% at pH 7.The superior performance of cPAM in comparison with aPAM and nPAM could be attributed to the charge-neutralization with Klebsiella cells.Through the comparison among complexation flocculation of PAM and aluminium sulphate,when aluminium sulphate was present,it was seen that the FR of nPAM was considerably greater than the case when no electrolyte was present with the maximum FR 95.1% occurring at pH 4.The results demonstrated that the flocculating role of charge neutralization gave priority over polymer bridging and this was crucial to optimizing flocculants and flocculating process of Klebsiella suspensions.
Zeta potential
Polyacrylamide
Surface charge
Cationic polymerization
Cite
Citations (2)
Zeta potential
Surface charge
Cite
Citations (0)
In this paper, the Zeta potential change process on colloid particles′ surface of mud with high con-centration and muddy dredger fill in Tianjin and Lianyungang was studied after adding high molecular weightCPAM, APAM, NPAM, PAC, organic and inorganic mixed solvent. The test results show that potential changes ofdredger fill in the two places are similar. All kinds of flocculants can make hydraulic fill slurry form colloid andcause settlement, and CPAM, PAC, PAC+CPAM, PAC+NPAM can make Zeta potential on colloid particles′ surfaceof dredger fill change between positive and negative. Slurry separation is obvious, and the combined flocculation ofPAC+NPAM is the most ideal. When the Zeta potential is between 0 and 4.927, it is beneficial to slurry flocculate.
Zeta potential
Settlement (finance)
Cite
Citations (1)
Flocculating mechanisms of bioflocculant from agrobacteriumradiobacter is dealt with in this paper by flocculation tests and measuring Zeta potential of kaolin particle.It is demonstrated that Ca2+,Al3+,Fe3+ can improve flocculating efficiency by neutralizing charge on the surface of kaolin particles,and bettering adsorption of bioflocculant on the particles.Zeta potential curve of kaolin particle shifts down at the range of pH2.0～10.0 after addition of bioflocculant,therefore it is proved bioflocculant is partly composed of anion groups and its flocculating function is based on bridging not on the neutralizing charge.The flocculating activity remains almost unchanged when heated for half hour under different temperatures(40～100℃).It is showed that the functional component in the bioflocculant is not sensitive to the heat and the ultra-violet spectra is proved that the it is not comprise proteins and nucleic acid.
Zeta potential
Surface charge
Particle (ecology)
Cite
Citations (0)
PAC, FeCl3 and Al2(SO4)3 are 3 kinds flocculants used in water treatment. In this paper the flocculation effects of the 3 kinds of flocculants on flocculation under different water powder condition were discussed in detail. It was found that the 3 kinds of flocculants had different reaction rate gradient values when they showed the best flocculate effects. Furthermore the influences of reaction time on the flocculation effects were studied. It was found that the flocculation effect would be improved with lengthening reaction time. It was found the PAC had the best flocculation effect in water treatment factory in whole year.
Cite
Citations (0)