scholarly journals Evaluation of Chitosan Derivatives Modified Mesoporous Silica Nanoparticles as Delivery Carrier

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2490
Author(s):  
Qi Li ◽  
Wenqian Wang ◽  
Gaowei Hu ◽  
Xianlan Cui ◽  
Dejun Sun ◽  
...  
Keyword(s):  
Water Solubility ◽  
Mesoporous Silica Nanoparticles ◽  
Acid Resistance ◽  
Sio2 Nanoparticles ◽  
The Body ◽  
Chitosan Derivatives ◽  
Mucous Membranes ◽  
Bile Resistance ◽  
Mesoporous Sio2 ◽  
Low Cytotoxicity

Chitosan is a non-toxic biological material, but chitosan is insoluble in water, which hinders the development and utilization of chitosan. Chitosan derivatives N-2-Hydroxypropyl trimethyl ammonium chloride (N-2-HACC) and carboxymethyl chitosan (CMCS) with good water solubility were synthesized by our laboratory. In this study, we synthesized mesoporous SiO2 nanoparticles by the emulsion, and then the mesoporous SiO2 nanoparticles were modified with γ-aminopropyltriethoxysilane to synthesize aminated mesoporous SiO2 nanoparticles; CMCS and N-2-HACC was used to cross-link the aminated mesoporous SiO2 nanoparticles to construct SiO2@CMCS-N-2-HACC nanoparticles. Because the aminated mesoporous SiO2 nanoparticles with positively charged can react with the mucous membranes, the virus enters the body mainly through mucous membranes, so Newcastle disease virus (NDV) was selected as the model drug to evaluate the performance of the SiO2@CMCS-N-2-HACC nanoparticles. We prepared the SiO2@CMCS-N-2-HACC nanoparticles loaded with inactivated NDV (NDV/SiO2@CMCS-N-2-HACC). The SiO2@CMCS-N-2-HACC nanoparticles as delivery carrier had high loading capacity, low cytotoxicity, good acid resistance and bile resistance and enteric solubility, and the structure of NDV protein encapsulated in the nano vaccine was not destroyed. In addition, the SiO2@CMCS-N-2-HACC nanoparticles could sustain slowly released NDV. Therefore, the SiO2@CMCS-N-2-HACC nanoparticles have the potential to be served as delivery vehicle for vaccine and/or drug.

pH-controlled release of substrates from mesoporous SiO2 nanoparticles gated by metal ion-dependent DNAzymes

2014 ◽  
Vol 2 (28) ◽  
pp. 4449-4455 ◽  
Author(s):  
Zhanxia Zhang ◽  
Fuan Wang ◽  
Dora Balogh ◽  
Itamar Willner
Keyword(s):  
Controlled Release ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Metal Ion ◽  
Mesoporous Silica Nanoparticles ◽  
Sio2 Nanoparticles ◽  
Mesoporous Sio2 ◽  
Ph Controlled ◽  
Programmed Release

pH-programmed release of fluorescent substrates from mesoporous silica nanoparticles is stimulated by Mg2+- or UO22+-dependent DNAzymes unlocking the pores.

scholarly journals Are Biogenic and Pyrogenic Mesoporous SiO2 Nanoparticles Safe for Normal Cells?

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1427
Author(s):  
Katarzyna Solarska-Ściuk ◽  
Kinga Adach ◽  
Sylwia Cyboran-Mikołajczyk ◽  
Dorota Bonarska-Kujawa ◽  
Agnieszka Rusak ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Biological Effects ◽  
Mesoporous Silica Nanoparticles ◽  
Volume Ratio ◽  
Sio2 Nanoparticles ◽  
Amorphous Structure ◽  
Intracellular Ros ◽  
Materials Used ◽  
The Impact

Silicon dioxide, in the form of nanoparticles, possesses unique physicochemical properties (size, shape, and a large surface to volume ratio). Therefore, it is one of the most promising materials used in biomedicine. In this paper, we compare the biological effects of both mesoporous silica nanoparticles extracted from Urtica dioica L. and pyrogenic material. Both SEM and TEM investigations confirmed the size range of tested nanoparticles was between 6 and 20 nanometers and their amorphous structure. The cytotoxic activity of the compounds and intracellular ROS were determined in relation to cells HMEC-1 and erythrocytes. The cytotoxic effects of SiO2 NPs were determined after exposure to different concentrations and three periods of incubation. The same effects for endothelial cells were tested under the same range of concentrations but after 2 and 24 h of exposure to erythrocytes. The cell viability was measured using spectrophotometric and fluorimetric assays, and the impact of the nanoparticles on the level of intracellular ROS. The obtained results indicated that bioSiO2 NPs, present higher toxicity than pyrogenic NPs and have a higher influence on ROS production. Mesoporous silica nanoparticles show good hemocompatibility but after a 24 h incubation of erythrocytes with silica, the increase in hemolysis process, the decrease in osmotic resistance of red blood cells, and shape of erythrocytes changed were observed.

EVALUATION OF TOXIOLOGICAL INDICATORS OF MONTHMORRILLONITE CLAY FOR THE PURPOSE OF USING THEM AS ALUMOSILICATE SOBENT AGAINST THE NEGATIVE EFFECT OF MYCOTOXINS ON THE BODY OF ANIMALS AND BIRDS

2021 ◽  
Vol 1 (1) ◽  
pp. 72-78
Keyword(s):  
Experimental Studies ◽  
The Body ◽  
Montmorillonite Clay ◽  
Test Substance ◽  
Negative Effects ◽  
Experimental Animals ◽  
Eyelid Edema ◽  
White Rats ◽  
Mucous Membranes ◽  
Negative Effect

The article presents the results of laboratory studies to assess the toxicological parameters of montmorillonite clay from the Pogadaevskoye deposit in the West Kazakhstan region in order to use them as an aluminosilicate sorbent in the composition of feeds that reduce the negative effects of mycotoxins on the body of animals and birds. The relevance of research is associated with the cultivation of healthy and highly productive animals and poultry in order to ensure the food security of the Republic of Kazakhstan.The studies carried out to assess the toxicological parameters of montmorillonite clay in order to use them as an aluminosilicate sorbent in experimental animals (rabbits and white rats) allowed the following results to be obtained: Visual study of the intensity of erythema when exposed to the test substance on the skin of rabbits showed their absence (0 points). The study of the intensity of edema (an increase in the thickness of the skin clutch of rabbits) when exposed to the test substance on the skin of rabbits showed no reaction (0 points). Studies evaluating the irritating effect of the test substances on the mucous membranes of the eyes of rabbits by symptoms of damage showed the absence of hyperemia (0 points). Weak eyelid edema (1 point), the minimum amount of discharge in the corner of the eye (1 point). The results of studies on the classification assessment of the test substance for the severity of the irritant effect on the eyes of rabbits showed that the average total score of the severity of the irritative effect corresponds to 1 point. A comprehensive analysis of the results obtained on the basis of scientific and experimental studies to assess the toxicological indicators of montmorillonite clay from the Pogadaevskoye deposit in relation to irritating effects on the skin and mucous membranes of experimental animals (rabbits) showed their harmlessness.

scholarly journals TOXICOLOGICAL EVALUATION OF INDOMETHACIN AS A RISK FACTOR FOR WORKERS’ HEALTH

2019 ◽  
Vol 98 (5) ◽  
pp. 503-508
Author(s):  
N. A. Martynova ◽  
Larisa G. Gorokhova ◽  
V. A. Shtaiger
Keyword(s):  
Blood Serum ◽  
Guinea Pigs ◽  
Muscle Relaxation ◽  
Lethal Dose ◽  
The Body ◽  
Male Rats ◽  
Hazard Class ◽  
Toxicological Evaluation ◽  
Mucous Membranes ◽  
Ulcerogenic Effect

Introduction. The toxicity of indomethacin was studied for its hygienic regulation. Material and methods. The toxic properties of indomethacin in the experiments on out-bred and linear mice, rats, Guinea pigs and rabbits contained in standard vivarium conditions and quarantined have been studied. In the experiments, various modes (single, repeated, chronic) and ways of exposure (intragastric, inhalation, epicutaneous) were modeled. The average lethal dose (LD50) of Indomethacin and the threshold of a single acute action (Limac) were determined; irritant effect on the skin and mucous membranes, cumulative and allergenic activity were revealed. In subacute and chronic intake to the body, the main target organs were determined on the based of the results of biochemical and hematological studies. Results. DL50 for male rats, females and male mice, when introduced into the stomach, were have been established to be 20, 15 and 25.6 mg/kg respectively. It refers to the substances of hazard class 2. DL50 in the intraperitoneal introduction for the rats accounted for 13.8 mg/kg, for Guinea pigs - 500 mg/kg. The clinical picture of acute poisoning in mice and rats was characterized by low mobility, decreasing breathing, ataxia, muscle relaxation, anorexia, diarrhea, ulceration with the perforation of the intestines, and the death on the 2-4th days after the poisoning. In the experiments on Guinea pigs, the ulcerogenic effect was not detected. Local irritant effect on the skin and mucous membranes of the eyes was not revealed. It has a marked skin-resorptive action causing ulcerogenic effect and the death of the animals after 6 applications. The introduction of verospiron to the rats in a dose of 25 mg/kg simultaneously with the application of indomethacin ointment on the skin prevented the ulcer development in the gastrointestinal tract and the death of the animals. No sensitizing effect was detected. It has an average cumulative ability: the cumulation coefficient amounted to 2.6. In a subacute experiment, there was a decrease in the body temperature and summation-threshold index, an increase in the vertical motor activity and a threshold of pain sensitivity. During the study of blood serum an increase in AcAt activity, a rise of chlorides in the blood serum and their decrease in the urine, and an increase in the number of erythrocytes and hemoglobin in peripheral blood were revealed. In the pathomorphological study, there was an increase in the coefficients of liver mass and ulceration of the stomach and intestines. The threshold of acute inhalation action accounted for 0.52 mg/m3 (by the reduction of the summation-threshold index and the content of sodium and chlorides in the urine). Conclusion. The maximum permissible concentration of indomethacin in the air of the working area was of 0.05 mg/m3 with the mark “special protection of the skin and eyes”, hazard class 1, aerosol.

Optical properties of hemicyanines with terminal amino groups and their applications in near-infrared fluorescent imaging of nucleoli

2014 ◽  
Vol 2 (40) ◽  
pp. 7065-7072 ◽  
Author(s):  
Jia-Tao Miao ◽  
Chen Fan ◽  
Ru Sun ◽  
Yu-Jie Xu ◽  
Jian-Feng Ge
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Water Solubility ◽  
Stokes Shift ◽  
Fluorescent Imaging ◽  
Amino Groups ◽  
Long Wave ◽  
Terminal Amino ◽  
Wave Emission ◽  
Low Cytotoxicity

A cellular dye with properties of long-wave emission, large Stokes shift, water solubility, low cytotoxicity, and good photostability is reported.

About bismuth pigmentation of mucous membranes

1930 ◽  
Vol 26 (9) ◽  
pp. 942-942
Author(s):  
A. Dmitriev
Keyword(s):  
Urinary Bladder ◽  
Mucous Membrane ◽  
The Body ◽  
Bladder Mucosa ◽  
Mucous Membranes

Abstracts. Venereology and Dermatology. Lohe and Rosenfeld (Derm. Z. Bd. 57, H. 4.29), studying the issue of bismuth pigmentation of the mucous membranes of the body with Bi therapy, describes two cases of Bi pigmentation of the urinary bladder mucosa. B1 pigmentation according to A. a., can exist with an inflamed state of the mucous membrane (qi stopelitis) and with normal; a. a. found at Bi pygm. mucous urine. belly. bacteria, however, the possibility of the existence of Bi n is not excluded. and without them; as a further symptom of capillary damage in general Bi pigmentation a. a. found in the sediment from the kidneys hemosiderin.

Diseases caused by the herpes simplex virus

2021 ◽  
pp. 8-13
Author(s):  
Nataliya Nikolaevna Sakhno
Keyword(s):  
Herpes Simplex Virus ◽  
Herpes Simplex ◽  
Asymptomatic Carrier ◽  
Complete Removal ◽  
The Body ◽  
Herpetic Infection ◽  
Herpes Infection ◽  
Route Of Transmission ◽  
Mucous Membranes ◽  
Simplex Virus

Herpetic infection is a disease caused by herpes simplex virus types 1 and 2; it belongs to the category of TORCH infections along with toxoplasmosis, rubella and cytomegalovirus. Herpetic infection is widespread, and recently there has been an increase in the number of cases of herpetic lesions detected, which is most likely due to the expansion of the range of diagnostic tests. Herpes simplex virus type 1 most often affects the skin and mucous membranes, type 2 leads to damage to the urogenital tract. The source of infection can be either a sick person or an asymptomatic carrier. This disease can be transmitted by household contact, during sexual intercourse; the «vertical» route of transmission from mother to child is also known. Depending on the extent of the lesion, localized, widespread and generalized forms are distinguished; the course of herpes infection can be acute, subacute and chronic; latent course of the disease is often found. In addition to the skin and mucous membranes, the central nervous system and (less often) internal organs can be affected. A typical clinical manifestation of herpes simplex is small blistering eruptions that appear on the face, mucous membrane of the lips, wings of the nose, ears, limbs, gluteal folds. The eruptions are usually preceded by itching and hyperemia at the site of the lesion. Diagnosis of herpes infection is carried out on the basis of clinical data and laboratory tests of blood or vesicle contents. Treatment of the disease involves the prescription of antiviral drugs, symptomatic agents, and immunocorrective therapy. Complete removal of the virus from the body is usually impossible, but strengthening the defenses and normalizing the lifestyle contribute to a significant decrease in the frequency of possible relapses.

A Synergistic Antimicrobial Mechanism of GO: Why Oxidative Stress Can Inactivate E. coli

NANO ◽  
2020 ◽  
Vol 15 (04) ◽  
pp. 2050054 ◽  
Author(s):  
Xin Li ◽  
Haoqi Zhao ◽  
Shidong Wang ◽  
Weiwu Zou ◽  
Peiyan Yang ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Antibacterial Activity ◽  
Mammalian Cells ◽  
Water Solubility ◽  
Direct Interaction ◽  
Medical Application ◽  
Future Application ◽  
Sem Images ◽  
E Coli ◽  
Low Cytotoxicity

Graphene oxide (GO), a 2D nanomaterial, is a promising material for medical application, thanks to its water solubility, antibacterial activity and relatively low cytotoxicity. However, many factors, such as lateral dimension, purity and surface chemistry, may influence its antibacterial activity, its exact mechanism is still unknown. In this work, E. coli was used as model bacterium to determine the antibacterial activity of well-dispersed GO which was obtained by a modified Hummer method and dialyzed to remove the salts and acid used in the oxidation process. After co-culture with GO for 2[Formula: see text]h, up to 90% E. coli cells were inactivated when GO concentration at 8[Formula: see text][Formula: see text]g/mL. The direct interaction was not detected in FE-SEM images and the results of [Formula: see text] potential showed that the interaction between GO and E. coli are repulsive[Formula: see text] Our results showed that GO can produce ROS and inactivate SOD and CAT enzymes in low concentration after co-cultured with E. coli which explained the antibacterial activity of GO in aqueous solution. Meanwhile, GO, with high purity, showed low cytotoxicity towards mammalian cells and did not cause any observable hemoglobin after co-cultured with blood cells. The data presented here prove that GO is effectively inhibit E. coli through inactivating SOD, CAT enzymes and the oxidative stress produced by ROS. Furthermore, the good biocompatibility promised its future application.

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