Heat shock in Cronobacter sakazakii induces direct protection and cross-protection against simulated gastric fluid stress

2021 ◽  
pp. 103948
Author(s):  
Hongmei Niu ◽  
MingzheYang ◽  
Yonghua Qi ◽  
Yangtai Liu ◽  
Xiang Wang ◽  
...  
Keyword(s):  
Heat Shock ◽  
Gastric Fluid ◽  
Cross Protection ◽  
Simulated Gastric Fluid ◽  
Cronobacter Sakazakii

scholarly journals Formulation of Quaternized Aminated Chitosan Nanoparticles for Efficient Encapsulation and Slow Release of Curcumin

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 449
Author(s):  
Ahmed M. Omer ◽  
Zyta M. Ziora ◽  
Tamer M. Tamer ◽  
Randa E. Khalifa ◽  
Mohamed A. Hassan ◽  
...  
Keyword(s):  
Slow Release ◽  
Sodium Tripolyphosphate ◽  
Chitosan Nanoparticles ◽  
Gastric Fluid ◽  
Release Profile ◽  
Simulated Gastric Fluid ◽  
Maximum Value ◽  
Structure Surface ◽  
Drug Encapsulation Efficiency

An effective drug nanocarrier was developed on the basis of a quaternized aminated chitosan (Q-AmCs) derivative for the efficient encapsulation and slow release of the curcumin (Cur)-drug. A simple ionic gelation method was conducted to formulate Q-AmCs nanoparticles (NPs), using different ratios of sodium tripolyphosphate (TPP) as an ionic crosslinker. Various characterization tools were employed to investigate the structure, surface morphology, and thermal properties of the formulated nanoparticles. The formulated Q-AmCs NPs displayed a smaller particle size of 162 ± 9.10 nm, and higher surface positive charges, with a maximum potential of +48.3 mV, compared to native aminated chitosan (AmCs) NPs (231 ± 7.14 nm, +32.8 mV). The Cur-drug encapsulation efficiency was greatly improved and reached a maximum value of 94.4 ± 0.91%, compared to 75.0 ± 1.13% for AmCs NPs. Moreover, the in vitro Cur-release profile was investigated under the conditions of simulated gastric fluid [SGF; pH 1.2] and simulated colon fluid [SCF; pH 7.4]. For Q-AmCs NPs, the Cur-release rate was meaningfully decreased, and recorded a cumulative release value of 54.0% at pH 7.4, compared to 73.0% for AmCs NPs. The formulated nanoparticles exhibited acceptable biocompatibility and biodegradability. These findings emphasize that Q-AmCs NPs have an outstanding potential for the delivery and slow release of anticancer drugs.

Modelling inactivation of wild‐type and clinical Escherichia coli O26 strains using UV‐C and thermal treatment and subsequent persistence in simulated gastric fluid

2019 ◽  
Vol 127 (5) ◽  
pp. 1564-1575 ◽  
Author(s):  
V.S. Castro ◽  
D.K.A. Rosario ◽  
Y.S. Mutz ◽  
A.C.C. Paletta ◽  
E.E.S. Figueiredo ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Thermal Treatment ◽  
Gastric Fluid ◽  
Simulated Gastric Fluid ◽  
Wild Type ◽  
Uv C

scholarly journals Fabrication of Multi-Layered Microspheres Based on Phase Separation for Drug Delivery

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 723
Author(s):  
He Xia ◽  
Ang Li ◽  
Jia Man ◽  
Jianyong Li ◽  
Jianfeng Li
Keyword(s):  
Aqueous Solution ◽  
Phase Separation ◽  
Gastric Fluid ◽  
Simulated Gastric Fluid ◽  
Sustained Drug Release ◽  
Simulated Intestinal Fluid ◽  
Glycol Diacrylate ◽  
Emulsion Droplets ◽  
Collection Tube ◽  
Poly Ethylene

In this work, we used a co-flow microfluidic device with an injection and a collection tube to generate droplets with different layers due to phase separation. The phase separation system consisted of poly(ethylene glycol) diacrylate 700 (PEGDA 700), PEGDA 250, and sodium alginate aqueous solution. When the mixture droplets formed in the outer phase, PEGDA 700 in the droplets would transfer into the outer aqueous solution, while PEGDA 250 still stayed in the initial droplet, breaking the miscibility equilibrium of the mixture and triggering the phase separation. As the phase separation proceeded, new cores emerged in the droplets, gradually forming the second and third layers. Emulsion droplets with different layers were polymerized under ultraviolet (UV) irradiation at different stages of phase separation to obtain microspheres. Microspheres with different layers showed various release behaviors in simulated gastric fluid (SGF) and simulated intestinal fluid (SIF). The release rate decreased with the increase in the number of layers, which showed a potential application in sustained drug release.

Chemical Forms of Mercury and Selenium in Fish Following Digestion with Simulated Gastric Fluid

2008 ◽  
Vol 21 (11) ◽  
pp. 2106-2110 ◽  
Author(s):  
Graham N. George ◽  
Satya P. Singh ◽  
Roger C. Prince ◽  
Ingrid J. Pickering
Keyword(s):  
Gastric Fluid ◽  
Simulated Gastric Fluid ◽  
Chemical Forms

Hydrolysis of Temazepam in Simulated Gastric Fluid and Its Pharmacological Consequence

1994 ◽  
Vol 83 (11) ◽  
pp. 1543-1547 ◽  
Author(s):  
Tian Jian Yang ◽  
Quan Long Pu ◽  
Shen K. Yang
Keyword(s):  
Gastric Fluid ◽  
Simulated Gastric Fluid ◽  
Hydrolysis Of

Preparation and Characterization of Cefradine/Montmorillionite Composites

2012 ◽  
Vol 560-561 ◽  
pp. 434-437 ◽  
Author(s):  
Lan Wang ◽  
Wen Ji Guo ◽  
Yan Zhao Zhao
Keyword(s):  
Gastric Fluid ◽  
Simulated Gastric Fluid ◽  
X Ray Diffraction ◽  
Simulated Intestinal Fluid ◽  
Solution Intercalation ◽  
Method Of Solution ◽  
Ft Ir ◽  
In The Beginning ◽  
Ft Ir Spectroscopy

The objective of this paper was to prepare the composite of crefradine/montmorillionite in the method of solution intercalation. The drug load and intercalation rate varied with the drug concentration. X-ray diffraction (XRD), Fourier transformed infrared (FT-IR) Spectroscopy, and thermal analysis (TG-DSC) were applied to characterize composite mentioned above. Together with drug release tests, results indicate cefradine intercalated into montmorillionite.The release profiles of cefradine/MMT in simulated gastric fluid (pH 1.2) and simulated intestinal fluid (pH 7.4) at 37°Cduring 10h are shown in Fig. 4. The amount of cefradine in the beginning 2h came up to 35% and 50%, and in the following time, cefradine released slowly. The release behaviors met the requirements of sustained release.

scholarly journals The Effect of Extrusion Voltage and Flowrate to the Viability and Survivability of Probiotic L. casei Encapsulated in Alginate-Chitosan

2021 ◽  
Vol 9 (3) ◽  
Author(s):  
Djaenudin ◽  
Endang Saepudin ◽  
Muhamad Nasir
Keyword(s):  
Sodium Alginate ◽  
Flow Rate ◽  
Liquid Flow Rate ◽  
Chitosan Solution ◽  
Gastric Fluid ◽  
Simulated Gastric Fluid ◽  
Chitosan Beads ◽  
Alginate Capsules ◽  
Encapsulation Process ◽  
Extrusion Method

 Chitosan-coated L. casei containing alginate capsules (shortened as L. casei capsules) were prepared by extruding L. casei containing alginate solution at different extrusion voltage and and flow rate followed by coating the wet capsules in chitosan solution. This study aimed to determine the effect of extrusion voltage and sodium alginate liquid flow rate on the viability of L. casei bacteria in the encapsulation process. The encapsulation process in this study was carried out by the extrusion method using sodium alginate of 1% (w/v) and chitosan of 0.2% (w/v). The resulted beads were immersed in a simulated gastric fluid (SGF) (NaCl 0.2%; HCl 0.5 M with a pH of 1.5) for 1, 60, and 120 min at 37 °C. The number of L. casei cells before encapsulation was 12.3 log CFU. After encapsulation, the maximum viability of L. Casei obtained by voltage variations of 0 kV and flow rate 5 mL/min were 12.26 log CFU.  After testing the beads in SGF for 1 min, the results obtained indicate that viability of L.casei in the sodium alginate - chitosan beads with an extrusion voltage of 0 kV and 5 mL/min was 11.8 log CFU/g. The result indicated that encapsulated L. casei in the sodium alginate - chitosan beads with a voltage of 0 kV and 5 mL/min was the highest survivability level of 97.38 %. The conclusions of the study were The higher extrusion voltage can kill more L. casei while the higher extrusion flow rate can protect more L. casei.

scholarly journals The The Effect of Alginate, Chitosan, and Nano Chitin as Encapsulation Materials of L. casei Probiotic Bacteria

2021 ◽  
Vol 9 (3) ◽  
Author(s):  
Djaenudin ◽  
Endang Saepudin ◽  
Muhamad Nasir
Keyword(s):  
Lactobacillus Casei ◽  
Gastric Fluid ◽  
Probiotic Bacteria ◽  
Simulated Gastric Fluid ◽  
Encapsulation Process ◽  
Chitin And Chitosan ◽  
Extrusion Method

Alginate, nano chitin, and chitosan polymers can be used to protect the Lactobacillus casei  from gastric conditions. The goal of this study was to determine the effect of alginate, nano chitin, and chitosan as encapsulation materials of  L. casei  on their survivability in simulated gastric fluid (SGF). The encapsulation  process in this study was carried out by the extrusion  method. The resulted beads were soaked  in SGF (pH of 1.2 and 3) for 1 and 60  min at 37°C. In SGF pH 1.2 for 60 min, the survivability of L.casei in all variations of the experiment was 0% except those encapsulated from alginate (1%), nano chitin (0.2%), and chitosan (0.2) % of 75.35%. In SGF pH 3 for 60 min, the survivability of L.casei was 0% for beads unencapsulation and encapsulation made from alginate, while the highest survivability of L.casei was 81.22% obtained in various encapsulation experiments using alginate (1%), nano chitin (0.2%), and chitosan (0.2%). The addition of nano chitin or chitosan to L.casei encapsulation material can increase the survivability of L.casei, also showed that the combination of alginate, nano chitin, and chitosan  in the encapsulated material significantly increased the survivability of L.casei at SGF pH 1.2 and 3.

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