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1.
Sensors (Basel) ; 24(16)2024 Aug 15.
Artículo en Inglés | MEDLINE | ID: mdl-39204984

RESUMEN

The effectiveness of copper oxide-modified electrochemical sensors using different polymers is being studied. The commercial powder was sonicated in an isopropyl alcohol solution and distilled water with 5 wt% polymers (chitosan, Nafion, PVP, HPC, α-terpineol). It was observed that the chitosan and Nafion caused degradation of CuO, but Nafion formed a stable mixture when diluted. The modified electrodes were drop-casted and analyzed using cyclic voltammetry in 0.1 M KCl + 3 mM [Fe(CN)6]3-/4- solution to determine the electrochemically active surface area (EASA). The results showed that α-terpineol formed agglomerates, while HPC created uneven distributions, resulting in poor stability. On the other hand, Nafion and PVP formed homogeneous layers, with PVP showing the highest EASA of 0.317 cm2. In phosphate-buffered saline (PBS), HPC and PVP demonstrated stable signals. Nafion remained the most stable in various electrolytes, making it suitable for sensing applications. Testing in 0.1 M NaOH revealed HPC instability, partial dissolution of PVP, and Cu ion reduction. The type of polymer used significantly impacts the performance of CuO sensors. Nafion and PVP show the most promise due to their stability and effective dispersion of CuO. Further optimization of polymer-CuO combinations is necessary for enhanced sensor functionality.

2.
J Pharm Health Care Sci ; 10(1): 31, 2024 Jun 21.
Artículo en Inglés | MEDLINE | ID: mdl-38907305

RESUMEN

BACKGROUND: The improvement in flowability and adhesion of starch powder (SP) is essential for using starch as an excipient for lactose intolerant patients. In this study, we attempted to evaluate the usefulness of hydroxypropylcellulose with molecular weight 80,000 (HPC-80) in the preparation of the starch granules (SG) as a substitute for excipient lactose. METHODS: Hydroxypropylcellulose with molecular weight 30,000 (HPC-30) and HPC-80 were used as binders to prepare the SG, and defined as HPC-30-SG and HPC-80-SG, respectively. Mean particle size (D50) was measured according to the Method, Optical Microscopy of Particle Size Determination in Japanese Pharmacopoeia, Eighteenth Edition, and storage stability were evaluated by measuring of the physical properties after vortexing the granules for 180 s (physical impact). The product loss rate was calculated from the weight change of the various excipients before and after the one dose packaging (ODP). RESULTS: The D50 of SP (30 µm) was smaller than that of the lactose powder (115 µm). The granulation with 0.75-3% HPC-30 and HPC-80 increased the particle size of SP, and the D50 in 1.5% HPC-30-SG (255 µm) and HPC-80-SG (220 µm) were higher than that of lactose. The excipient was removed from the heat seal of the ODP, and upon visual inspection, a large amount of starchy material was observed to be adhering to the paper in the SP. On the other hand, the low recovery rate in SP was attenuated by the granulation with HPC-30 and HPC-80. In the both HPC-30 and HPC-80, the improvement in recovery rate reached a plateau at 1.5%, and the levels of recovery rate was similar to that of lactose. The recovery rate in the 0.75-3% HPC-30-SG and 0.75% HPC-80-SG were decreased by the physical impact, however, the recovery rate and amount of 1.5% and 3% HPC-80-SG were not affected by the physical impact, and these levels were similar to that of lactose. CONCLUSIONS: The use of HPC-80 as a binder of SG was found to produce a higher quality granule product than conventional HPC-based SG. This finding is useful in streamlining the preparation of starch-based powdered medicine in clinical applications.

3.
Liver Int ; 43(12): 2794-2807, 2023 12.
Artículo en Inglés | MEDLINE | ID: mdl-37833852

RESUMEN

BACKGROUND AND AIMS: Hepatocellular carcinoma (HCC) is a typically fatal malignancy with limited treatment options and poor survival rates, despite recent FDA approvals of newer treatment options. We aim to address this unmet need by using a proprietary computational drug discovery platform that identifies drug candidates with the potential to advance rapidly and successfully through preclinical studies. METHODS: We generated an in silico model of HCC biology to identify the top 10 small molecules with predicted efficacy. The most promising candidate, CYT997, was tested for its in vitro effects on cell viability and cell death, colony formation, cell cycle changes, and cell migration/invasion in HCC cells. We used an HCC patient-derived xenograft (PDX) mouse model to assess its in vivo efficacy. RESULTS: CYT997 was significantly more cytotoxic against HCC cells than against primary human hepatocytes, and sensitized HCC cells to sorafenib. It arrested cell cycle at the G2/M phase with associated up-regulations of p21, p-MEK1/2, p-ERK, and down-regulation of cyclin B1. Cell apoptosis and senescence-like morphology were also observed. CYT997 inhibited HCC cell migration and invasion, and down-regulated the expressions of acetylated tubulins, ß-tubulin, glypican-3 (GPC3), ß-catenin, and c-Myc. In vivo, CYT997 (20 mg/kg, three times weekly by oral gavage) significantly inhibited PDX growth, while being non-toxic to mice. Immunohistochemistry confirmed the down-regulation of GPC3, c-Myc, and Ki-67, supporting its anti-proliferative effect. CONCLUSION: CYT997 is a potentially efficacious and non-toxic drug candidate for HCC therapy. Its ability to down-regulate GPC3, ß-catenin, and c-Myc highlights a novel mechanism of action.


Asunto(s)
Carcinoma Hepatocelular , Neoplasias Hepáticas , Humanos , Ratones , Animales , Carcinoma Hepatocelular/patología , beta Catenina/metabolismo , Neoplasias Hepáticas/patología , Apoptosis , Microtúbulos/metabolismo , Microtúbulos/patología , Línea Celular Tumoral , Proliferación Celular , Glipicanos
4.
Int J Biol Macromol ; 249: 126008, 2023 Sep 30.
Artículo en Inglés | MEDLINE | ID: mdl-37516229

RESUMEN

In this article, we describe the formulation of polyaniline-chitosan/MoS2 (PANI-CS @MoS2) blended composite and evaluated its efficiency to degrade the dye molecules Rhodamine B (RhB) and Malachite Green (MG) under visible light. In the photocatalytic mechanism, the CS acts as an electron carrier and binding agent during the oxidation reaction to decrease the recombination of electrons and holes generated by the irradiation of light. FTIR, XPS, XRD, TG, Zeta Potential, UV, SEM, AFM and TEM were used to characterize the PANI-CS@MoS2 composite after it had been synthesized. For the degradation analysis, 30 mg/L concentrations of 50 mL MG and RhB dye solutions were used. The recommended dosage of the composite was 100 mg. For MG and RhB dyes, the colour removal rates were 96.2 % and 91.5 %, respectively, under exposure to visible light and at the pH ranges of 8-11. After being exposed to visible light for 60 min, the whole decay process was accomplished. The photocatalyst offers great extensibility up to five iterations. The Langmuir-Hinshelwood kinetic model governs the rate of dye molecules degradation. The result of the study revealed that the PANI-CS@MoS2 composite matrix perhaps be a trustworthy and practical substrate for the efficient refinement of dye-deteriorated water⁠⁠⁠⁠⁠⁠⁠.


Asunto(s)
Quitosano , Colorantes , Molibdeno , Compuestos de Anilina/química
6.
Pharmaceutics ; 15(1)2023 Jan 10.
Artículo en Inglés | MEDLINE | ID: mdl-36678863

RESUMEN

Niosomes are a potential tool for the development of active targeted drug delivery systems (DDS) for cancer therapy because of their excellent behaviour in encapsulating antitumorals and the possibility to easily functionalise their surface with targeting agents. Recently, some of us developed a synthetic carbohydrate binding agent (CBA) able to target the mannosidic residues of high-mannose-type glycans overexpressed on the surface of several cancer cell lines, promoting their apoptosis. In this article, we modified the structure of this mannose receptor to obtain an amphiphilic analogue suitable for the functionalization of doxorubicin-based niosomes. Several niosomal formulations and preparation methods were investigated deeply to finally obtain functionalized niosomes suitable for parental administration, which were stable for over six months and able to encapsulate up to 85% of doxorubicin (DOXO). In vitro studies, carried out towards triple-negative cancer cells (MDA-MB231), overexpressing high-mannose-type glycans, showed a cytotoxic activity comparable to that of DOXO but with an appreciable increment in apoptosis given by the CBA. Moreover, niosomal formulation was observed to reduce doxorubicin-induced cytotoxicity towards normal cell lines of rat cardiomyocytes (H9C2). This study is propaedeutic to further in vivo investigations that can aim to shed light on the antitumoral activity and pharmacokinetics of the developed active targeted DDS.

7.
Front Cell Infect Microbiol ; 12: 990875, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-36211961

RESUMEN

Cyanovirin-N (CV-N), a lectin from Nostoc ellipsosporum was found an infusion inhibitory protein for human immunodeficiency virus (HIV)-1. A tandem-repeat of the engineered domain-swapped dimer bound specific sites at hemagglutinin (HA), Ebola and HIV spike glycoproteins as well as dimannosylated HA peptide, N-acetyl-D-glucosamine and high-mannose containing oligosaccharides. Among these, CV-N bound the severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) spike protein at a dissociation constant (KD) of 18.6 µM (and KD=260 µM to RBD), which was low-affinity carbohydrate-binding as compared with the recognition of the other viral spikes. Binding of dimannosylated peptide to homo-dimeric CVN2 and variants of CVN2 that were pairing Glu-Arg residues sterically located close to its high-affinity carbohydrate binding sites, was measured using surface plasmon resonance (SPR) and isothermal titration calorimetry (ITC). Binding affinity increased with polar interactions, when the mutated residues were used to substitute a single, or two disulfide bonds, in CVN2. Site-specific N-linked glycans on spikes were mediating the infection with influenza virus by broadly neutralizing antibodies to HA and lectin binding to HA was further investigated via modes of saturation transfer difference (STD)-NMR. Our findings showed that stoichiometry and the lectin's binding affinity were revealed by an interaction of CVN2 with dimannose units and either the high- or low-affinity binding site. To understand how these binding mechanisms add to viral membrane fusion we compare our tested HA-derived peptides in affinity with SARS-CoV-2 glycoprotein and review lectins and their mechanisms of binding to enveloped viruses for a potential use to simulate neutralization ability.


Asunto(s)
COVID-19 , Infecciones por VIH , VIH-1 , Acetilglucosamina , Antivirales/farmacología , Sitios de Unión , Anticuerpos ampliamente neutralizantes , Proteínas Portadoras/química , Disulfuros , Glicoproteínas , Hemaglutininas , Humanos , Lectinas/genética , Manosa/química , Oligosacáridos/química , Péptidos , Polisacáridos , Unión Proteica , SARS-CoV-2/genética , Glicoproteína de la Espiga del Coronavirus/genética
8.
Polymers (Basel) ; 14(1)2022 Jan 05.
Artículo en Inglés | MEDLINE | ID: mdl-35012237

RESUMEN

Natural eco-friendly materials are recently employed in products to replace synthetic materials due to their superior benefits in preserving the environment. The herb Coccinia grandis is widely distributed in continents like Asia and Africa and used traditionally to treat fever, leprosy, asthma, jaundice, and bronchitis. Mucilage of Coccinia grandis was accordingly extracted, isolated by a maceration technique, and precipitated. The mucilage was evaluated for its physicochemical, binding, and disintegrant properties in tablets using paracetamol as a model drug. The crucial physicochemical properties such as flow properties, solubility, swelling index, loss on drying, viscosity, pH, microbial load, cytotoxicity was evaluated and the compatibility was analyzed using sophisticated instrumental methods (TGA, DTA, DSC, and FTIR). The binding properties of the mucilage was used at three different concentrations and compared with starch and PVP as examples of standard binders. The disintegrant properties of mucilage were used at two different concentrations and compared with standard disintegrants MCCP, SSG, and CCS. The tablets were punched and evaluated for their hardness, friability, assay, disintegration time, in vitro dissolution profiles. In vitro cytotoxicity studies of the mucilage were performed in a human embryonic kidney (HEK) cell line. The outcome of the study indicated that the mucilage had good performance compared with starch and PVP. Further, the mucilage acts as a better disintegrant than MCCP, SSG and CCS for paracetamol tablets. Use of a concentration of 3% or less demonstrated the ability of the mucilage to act as a super disintegrating agent and showed faster disintegration and dissolution, which makes it as an attractive, promising disintegrant in formulating solid dosage forms to improve the therapeutic efficacy and patient compliance. Moreover, the in vitro cytotoxicity evaluation results demonstrated that the mucilage is non-cytotoxic to human cells and is safe.

9.
Foods ; 12(1)2022 Dec 23.
Artículo en Inglés | MEDLINE | ID: mdl-36613300

RESUMEN

A bacon-type meat analogue consists of different structural layers, such as textured protein and a fat mimetic. To obtain a coherent and appealing product, a suitable binder must glue those elements together. A mixture based on pea protein and sugar beet pectin (r = 2:1, 25% w/w solids, pH 6) with and without laccase addition and a methylcellulose hydrogel (6% w/w) serving as benchmark were applied as binder between textured protein and a fat mimetic. A tensile strength test, during which the layers were torn apart, was performed to measure the binding ability. The pea protein-sugar beet pectin mixture without laccase was viscoelastic and had medium and low binding strength at 25 °C (F ≤ 3.5 N) and 70 °C (F ≈ 1.0 N), respectively. The addition of laccase solidified the mixture and increased binding strength at 25 °C (F ≥ 4.0 N) and 70 °C (F ≈ 2.0 N), due to covalent bonds within the binder and between the binder and the textured protein or the fat mimetic layers. Generally, the binding strength was higher when two textured protein layers were glued together. The binding properties of methylcellulose hydrogel was low (F ≤ 2.0 N), except when two fat mimetic layers were bound due to hydrophobic interactions becoming dominant. The investigated mixed pectin-pea protein system is able serve as a clean-label binder in bacon-type meat analogues, and the application in other products seems promising.

10.
Anticancer Agents Med Chem ; 22(2): 344-348, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-33992065

RESUMEN

BACKGROUND: The lead compounds from the series of 2, 4-disubstituted quinoline-3-carboxylic acid derivatives were selected for the in-silico mechanistic study. The compounds were found selective and potent for the cancer cell. Moreover, the relevant ADME in-silico data also support the safety of lead. OBJECTIVE: The objective of the study is to correlate the interaction of DNA and quinoline derivative, which was reported with the fluorescence microscopy images of cells in-vitro data in the recently published data. METHODS: The detailed interaction study with the DNA dodecanucleotide sequenced d(CGCGAATTCGCG) shows the present lead bounds with the A/T minor groove region of a B-DNA duplex through the important major and minor hydrogen bonds. RESULTS: The present in-silico study supports the interactions of the drug with DNA with sufficient binding interactions and energy. The present study also gives vital information related to the mechanism of drug action, which was initially declared as a DNA targeting molecule through a fluorescence-based target study. CONCLUSION: The substitution at 2nd position (the carbonyl group) of the lead revealed as a hydrogen bond donor/acceptor for adenine and guanine nucleic acid-base pair. The in-silico prediction also confirmed the interaction pattern of the lead with the DNA, which will be further utilized for drug development.


Asunto(s)
ADN/química , Quinolinas/química , Relación Dosis-Respuesta a Droga , Ligandos , Simulación del Acoplamiento Molecular , Estructura Molecular , Relación Estructura-Actividad
11.
BMC Anesthesiol ; 21(1): 206, 2021 08 17.
Artículo en Inglés | MEDLINE | ID: mdl-34404345

RESUMEN

BACKGROUND: Residual neuromuscular block at the end of surgery may compromise the patient's safety. The risk of airway complications can be minimized through monitoring of neuromuscular function and reversal of neuromuscular block if needed. Effective reversal can be achieved with selective relaxant binding agents, however, sugammadex is the only clinically approved drug in this group. We investigated the concentration-response properties of a novel selective relaxant binding agent, carboxymethyl-γ-cyclodextrin for the reversal of neuromuscular block. We evaluated the hypothesis that it is equally potent for reversing neuromuscular block as sugammadex. METHODS: Phrenic nerve - hemidiaphragm tissue preparations were isolated from male Wistar rats and suspended in a tissue holder allowing electrical stimulation of the nerve and monitoring of muscle contraction force. Concentration-response relationships were constructed for the neuromuscular blocking agents rocuronium, pipecuronium, and vecuronium. The half-effective concentrations of sugammadex and carboxymethyl-γ-cyclodextrin for reversal of neuromuscular block were determined. RESULTS: The half effective concentrations (95% confidence interval, CI) were 7.50 (6.93-8.12) µM for rocuronium, 1.38 (1.33-1.42) µM for pipecuronium, and 3.69 (3.59-3.80) µM for vecuronium. The half effective concentrations (95% CI) of carboxymethyl-γ-cyclodextrin and sugammadex were 35.89 (32.67-39.41) µM and 3.67 (3.43-3.92) µM, respectively, for the reversal of rocuronium-induced block; 10.14 (9.61-10.70) µM and 0.67 (0.62-0.74) µM, respectively, for the reversal of pipecuronium-induced block; and 376.1 (341.9-413.8) µM and 1.45 (1.35-1.56) µM, respectively, for the reversal of vecuronium-induced block. CONCLUSIONS: Carboxymethyl-γ-cyclodextrin is an effective, but less potent agent for reversal of neuromuscular block than sugammadex.


Asunto(s)
Bloqueo Neuromuscular , Bloqueantes Neuromusculares/antagonistas & inhibidores , gamma-Ciclodextrinas/farmacología , Animales , Ratas Wistar
12.
Artículo en Inglés | MEDLINE | ID: mdl-33183208

RESUMEN

AIM: To formulate and preliminary evaluated polysaccharide based mucoadhesive floating tablets of Cinnarizine. BACKGROUND: Gastro-retentive drug delivery systems has proved to be a successful approach to enhance the gastric residence with site specific targeting for achieving local or generalized effect. Various patents has also been filed globally employing gastro-retentive approach. OBJECTIVE: The study is designed to explore the mucoadhesive and low density characteristics of corn fibre gum (CFG) for preparation of gastro-retentive floating tablets of cinnarizine. METHODS: Floating tablets were prepared by direct compression technique using different concentrations of CFG (45, 50, 60% w/w). The formulated floating tablet batches were evaluated for their hardness, friability, drug content, floating duration/ lag time, swelling behavior, bioadhesive strength and in vitro drug release. RESULTS: Mucoadhesive strength was found to increase with an increment in the polysaccharide concentration. Swelling index was found to increase both with the increase in CFG concentration and with duration for which tablet remains in medium. The in vitro drug release studies indicated decrease in drug release (91% to 77%) with the increase in polymer concentration. The release data was further fitted to various kinetic models which revealed the drug release to be in accordance with Zero-order and Higuchi models, indicating polymer to exhibit the swellable matrix forming abilities. The value of n (between 0.458 and 0.997) from Korsemeyer Peppas model depicted the possibility of drug to follow more than one mechanism of release from the formulation i.e. diffusion and erosion. Stability studies revealed the preparations to retain their integrity and pharmaceutical characteristics at variable storage conditions. CONCLUSION: Thus from the research findings, CFG could be concluded to possess potential binder, release retardant and mucoadhesive characteristics which could be successfully employed for the formulation of gastro-retentive floating tablets.

13.
Molecules ; 25(18)2020 Sep 15.
Artículo en Inglés | MEDLINE | ID: mdl-32942531

RESUMEN

Pellets refer to solid biofuels for heating and power. The pellet's integrity is of great relevant to ensure safe and effective transportation and storage, and comfort to stakeholders. Several materials that are supportive, whether organic and inorganic, to pellets exist. However, no work in the literature is linking making hybrid non-wood pellets with addition of residual biomass from distillation of cellulosic bioethanol, and this requires further investigations. Figuring out how effective this challenging agro-industrial residue could be for reinforcing non-wood pellets is accordingly the scientific point of this study focusing on management of waste and valorization of biomass. The pilot-scale manufacturing of hybrid pellets consisted of systematically pressing sugarcane bagasse with the lignocellulosic reinforcement at the mass ratios of 3:1, 1:1, and 1:3 on an automatic pelletizer machine at 200 MPa and 125 °C. Elemental contents of C and H, durability, and energy density all increased significantly from 50.05 to 53.50%, 5.95 to 7.80%, 95.90 to 99.55%, and 28.20 to 31.20 MJ kg-1, respectively, with blending the starting material with the reinforcement at 1:3. Preliminary evidence of residual biomass from distillation of second-generation bioethanol capable of highly improving molecular flammable/combustible properties, mechanical stability, and fuel power of composite non-wood pellets exist.


Asunto(s)
Biocombustibles , Lignina/química , Biomasa , Carbono/química , Calor , Hidrógeno/química , Oxígeno/química , Tamaño de la Partícula , Presión , Saccharum/química
14.
Polymers (Basel) ; 12(8)2020 Jul 29.
Artículo en Inglés | MEDLINE | ID: mdl-32751175

RESUMEN

Citric acid (CA) can be found naturally in fruits and vegetables, particularly citrus fruit. CA is widely used in many fields but its usage as a green modifying agent and binder for wood is barely addressed. Esterification is one of the most common chemical reactions applied in wood modification. CA contains three carboxyl groups, making it possible to attain at least two esterification reactions that are required for crosslinking when reacting with the hydroxyl groups of the cell wall polymers. In addition, the reaction could form ester linkages to bring adhesivity and good bonding characteristics, and therefore CA could be used as wood binder too. This paper presents a review concerning the usage of CA as a wood modifying agent and binder. For wood modification, the reaction mechanism between wood and CA and the pros and cons of using CA are discussed. CA and its combination with various reactants and their respective optimum parameters are also compiled in this paper. As for the major wood bonding component, the bonding mechanism and types of wood composites bonded with CA are presented. The best working conditions for the CA in the fabrication of wood-based panels are discussed. In addition, the environmental impacts and future outlook of CA-treated wood and bonded composite are also considered.

15.
Cancers (Basel) ; 12(4)2020 Apr 22.
Artículo en Inglés | MEDLINE | ID: mdl-32331483

RESUMEN

Despite emerging targeted and immunotherapy treatments, no monoclonal antibodies or antibody-drug conjugates (ADCs) directly targeting tumor cells are currently approved for melanoma therapy. The tumor-associated antigen chondroitin sulphate proteoglycan 4 (CSPG4), a neural crest glycoprotein over-expressed on 70% of melanomas, contributes to proliferative signaling pathways, but despite highly tumor-selective expression it has not yet been targeted using ADCs. We developed a novel ADC comprising an anti-CSPG4 antibody linked to a DNA minor groove-binding agent belonging to the novel pyrridinobenzodiazepine (PDD) class. Unlike conventional DNA-interactive pyrrolobenzodiazepine (PBD) dimer payloads that cross-link DNA, PDD-based payloads are mono-alkylating agents but have similar efficacy and substantially enhanced tolerability profiles compared to PBD-based cross-linkers. We investigated the anti-tumor activity and safety of the anti-CSPG4-(PDD) ADC in vitro and in human melanoma xenografts. Anti-CSPG4-(PDD) inhibited CSPG4-expressing melanoma cell growth and colony formation and triggered apoptosis in vitro at low nanomolar to picomolar concentrations without off-target Fab-mediated or Fc-mediated toxicity. Anti-CSPG4-(PDD) restricted xenograft growth in vivo at 2 mg/kg doses. One 5 mg/kg injection triggered tumor regression in the absence of overt toxic effects or of acquired residual tumor cell resistance. This anti-CSPG4-(PDD) can deliver a highly cytotoxic DNA mono-alkylating payload to CSPG4-expressing tumors at doses tolerated in vivo.

16.
J Anim Sci Technol ; 62(1): 94-102, 2020 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-32082603

RESUMEN

This study aimed to investigate the possibility of replacing the isolated soy protein (ISP) as a binding agent for wheat, oat, and bamboo shoot dietary fibers. Dietary fibers and ISP were added to manufacturing process of pork emulsion, respectively, for investigate quality properties. Moisture contents of pork emulsion added wheat fiber-treated group was significantly higher than ISP-treated group (p < 0.05), and protein contents of dietary fiber-treated group were significantly lower than ISP-treated group (p < 0.05). Raw pork emulsion CIE a* value of oat, bamboo shoot fiber-treated group were significantly lower than ISP-treated group (p < 0.05). After cooking pork emulsion CIE L* value of dietary fiber-treated group were significantly higher than ISP-treated group (p < 0.05). Raw pork emulsion water holding capacity (WHC) of wheat, oat fiber-treated group were significantly higher than ISP-treated group (p < 0.05), and cooked pork emulsion WHC of wheat, bamboo shoot fiber-treated group were higher than ISP-treated group (p < 0.05). Cooking loss of ISP-treated group was significantly higher than dietary fiber-treated group (p < 0.05), and viscosity of ISP-treated group was lower than dietary fiber-treated group. Hardness of ISP-treated group was significantly lower than dietary fiber-treated group (p < 0.05); however, cohesiveness of ISP-treated group was significantly higher than dietary fiber-treated group (p < 0.05). In conclusion, dietary fiber added as binding agent to manufacturing process of pork emulsion was suitable to replacing ISP.

17.
Acta Biochim Biophys Sin (Shanghai) ; 52(1): 91-96, 2020 Jan 02.
Artículo en Inglés | MEDLINE | ID: mdl-31833535

RESUMEN

Distamycin (DST) is a well-characterized DNA minor groove binder with antivirus activity and antitumor potency. Two separate gene clusters (a 28-kb cluster and a 7-kb cluster) have recently been identified to coordinately encode the biosynthetic machinery of DST in Streptomyces netropsis. Here we report a gene cassette, which is linked to the aforementioned smaller dst gene cluster and plays an important role in the self-resistance to DST in S. netropsis. This cassette consists of three uncharacterized genes that might be implicated in DNA replication/repair. Knockout of the cassette led to the decrease in the production of DST, while heterologous expression of part of the cassette in S. lividans made it become resistant to both DST and mitomycin C, another DNA-binding agent. More interestingly, homologs of these three genes were found in genomes of other actinomyces that produce DNA-binding antibiotics, suggesting that a novel common mechanism in addition to pumping may enable these strains to resist the cytotoxic metabolites they produced.


Asunto(s)
Antibacterianos/farmacología , Reparación del ADN/genética , Replicación del ADN/genética , Distamicinas/farmacología , Farmacorresistencia Bacteriana/genética , Genes Bacterianos/genética , Streptomyces/genética , Antibacterianos/biosíntesis , Células Cultivadas , Proteínas de Unión al ADN/biosíntesis , Proteínas de Unión al ADN/farmacología , Distamicinas/biosíntesis , Escherichia coli/genética , Técnicas de Inactivación de Genes , Mitomicina/farmacología , Familia de Multigenes/genética , Streptomyces/efectos de los fármacos , Streptomyces lividans/efectos de los fármacos
18.
Data Brief ; 33: 106535, 2020 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-34026955

RESUMEN

Pellet mixed with 5 wt% and 10 wt% of binders was tested. The pelleting process was performed using a pellet mill operated at 100 °C and at 50 MPa. The physical and chemical characteristics including hardness, high heating value and proximate analysis of pellet produces were obtained using durometer and through thermographic analysis and the results were reported in this paper. Bulk and unit density were determined according to ASABE standard. The dataset presented here are the data of palm kernel shell pellet prepared using two types of binder; (1) sago starch and (2) sodium acetate. The pelletization of palm kernel shell aimed to increase the density and strength of the palm kernel shell pellet and consequently provide better thermal degradation characteristics.

19.
Artículo en Inglés | MEDLINE | ID: mdl-31185415

RESUMEN

In recent years, Cobinamide (Cbi) has shown promise as a therapeutic for cyanide poisoning. There are several forms of Cbi based on the identity of the ligands bound to the cobalt in Cbi and these different forms of Cbi have divergent behavior (e.g., the aquo and hydroxo forms of Cbi readily bind to proteins, limiting their distribution significantly, whereas [Cbi(CN)2] does not). While current analysis techniques only measure total Cbi, methods to elucidate the behavior of 'available' Cbi versus cyanide-complexed Cbi would be valuable for biomedical and pharmacokinetic studies. Therefore, a method was developed for the analysis of cyanide-complexed Cbi in plasma via liquid chromatography tandem mass spectrometry (LC-MS-MS). Plasma samples were prepared by denaturing proteins with 10% ammonium hydroxide in acetonitrile. The resulting mixture was centrifuged, and the supernatant was removed, dried, and reconstituted. Cyanide-complexed Cbi was then analyzed via LC-MS-MS. The limit of detection was 0.2 µM, and the linear dynamic range was between 1 and 200 µM. The accuracy was 100 ±â€¯17% and the precision, measured by relative standard deviation (%RSD), was ≤18.5%. Carryover, a severe problem when analyzing Cbi via liquid chromatography was eliminated using a polymeric-based stationary phase (PLRP-S) and a controlled washing protocol. The method allowed evaluation of the cyanide-bound and 'available' Cbi from treated animals and, when paired with a method for total Cbi analysis, allows for estimation of Cbi utilization when treating cyanide poisoning.


Asunto(s)
Cromatografía Líquida de Alta Presión/métodos , Cobamidas/sangre , Espectrometría de Masas en Tándem/métodos , Animales , Cianuros/sangre , Límite de Detección , Plasma/química , Conejos , Porcinos
20.
Food Chem ; 283: 390-396, 2019 Jun 15.
Artículo en Inglés | MEDLINE | ID: mdl-30722889

RESUMEN

To examine the effect of starch variety and structure-related attributes on noodle starch digestibility, cooked Japanese commercial noodles, such as Harusame (mung bean starch), Malony (potato starch) and Udon (wheat flour), were kinetically analyzed during simulated in vitro digestion. The kinetic constant of the homogenized noodle slurry (10.8 × 10-2-22.9 × 10-2) was 10-20 times higher than that of the intact one (0.9 × 10-2-1.5 × 10-2), whereas the equilibrium starch hydrolysis (%) was equivalent. Therefore, the noodle microstructure, which is influenced by the present of binding agent and enhancer, should relate to the starch digestibility. Also, the starch digestibility at the early small intestine phase was associated with the cohesiveness and water retention ability of the cooked noodles. These results indicate that the internal microstructures of cooked noodles and the binding agent properties play an important role in the starch digestibility of noodles.


Asunto(s)
Manipulación de Alimentos/métodos , Solanum tuberosum/metabolismo , Almidón/metabolismo , Triticum/metabolismo , Vigna/metabolismo , Amilosa/análisis , Módulo de Elasticidad , Hidrólisis , Japón , Microscopía Electrónica de Rastreo , Almidón/química , Agua/química
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