Neomycin Research Articles

An unusual case of giant rhinophyma

Rosacea is a rather common and frequently diagnosed condition of the skin and may in some cases progress to rhinophyma. This is a case report of a patient with a giant rhinophyma of 358 g. He claimed his first symptoms 5 years prior to our first clinical assessment. We performed an excision of the tumor mass by scalpel and a CO2 laser treatment of the remaining skin surface. Post-surgical therapy only included topical treatment with an ointment containing bacitracin zinc and neomycin sulphate to prevent infections. After stable wound closure, we had the chance to examine the patient after a period of 7.5 years with remarkable aesthetical results. Level of Evidence: Level V, therapeutic study.

Monitoring of neomycin sulfate antibiotic in microbial fuel cells

Indirect detection and quantification of the neomycin sulfate antibiotic was accomplished in microbial fuel cells. Performance of the microbial fuel cells was examined on the basis of the following parameters; voltage generation, power density, current density and coulombic efficiencies. Removal of neomycin sulfate was monitored using LC-MS/MS in parallel with chemical oxygen demand and total carbohydrate removal. While neomycin sulfate was partially degraded, microbial fuel cell performance appeared to be affected and eventually inhibited by neomycin sulfate on a concentration-based fashion. In order to further examine the neomycin sulfate bio-sensing activity of the microbial fuel cell, a computational chemistry approach was used to obtain the information about the highest occupied molecular orbital-lowest unoccupied molecular orbital energy values of outer electron orbitals, their distribution, and ionization potentials (IPs). The results showed that electroactive bio-film-based MFCs can be used for sensitive detection of neomycin sulfate found in wastewaters.

Disruption of the Gut Microbiota With Antibiotics Exacerbates Acute Vascular Rejection.

The gut microbiota influences many immunological processes but how its disruption affects transplant rejection is poorly understood. Interposition grafting of aortic segments was used to examine vascular rejection. The gut microbiota was disrupted in graft recipients using an antibiotic cocktail (ampicillin, vancomycin, metronidazole, neomycin sulfate) in their drinking water. Treatment of mice with antibiotics severely reduced total bacterial content in the intestine and disrupted the bacterial composition. Short-term treatment of mice for only the first 3 weeks of life resulted in the population of the intestine in mature mice with bacterial communities that were mildly different from untreated mice, containing slightly more Clostridia and less Bacteroides. Antibiotic disruption of the gut microbiota of graft recipients, either for their entire life or only during the first 3 weeks of life, resulted in increased medial injury of allograft arteries that is reflective of acute vascular rejection but did not affect intimal thickening reflective of transplant arteriosclerosis. Exacerbated vascular rejection resulting from disruption of the gut microbiota was related to increased infiltration of allograft arteries by neutrophils. Disruption of the gut microbiota early in life results in exacerbation of immune responses that cause acute vascular rejection.

Novel hydrogel-based ocular drug delivery system for the treatment of conjunctivitis.

Conventional dosage form like eye drops showed poor therapeutic response and also require frequent dosing. Therefore, developing the dosage form to deliver the drug to the target site without much loss of drug or without causing any systemic side effects is the challenging job for the researchers in pharmaceutical industries. The main aim of the present work was to formulate and evaluate hydrogel-based drug delivery containing combination of neomycin sulphate and betamethasone sodium phosphate in order to provide prolonged release and also better bioavailability of drugs for the treatment of eye infections. In this study, poloxamer 407 and chitosan at different concentrations were used as the gelling agents. The prepared formulations were evaluated for clarity, pH, drug content, gelling capacity, gelling temperature and in vitro drug release study. From the preliminary studies, F5 formulation was selected as an optimized formulation. The optimized formulation was further evaluated for ex vivo permeation study, sterility test, HET-CAM and ocular irritation testing using rabbits. Ocular irritation by HET-CAM assay showed that the formulated gel does not cause any irritation to the blood vessels. Draize irritation test was performed using rabbits and results showed that formulation was non-irritant to the eye. The formulated hydrogel formulation can be used as an alternative to conventional ophthalmic eye drop formulation of drugs neomycin and betamethasone for the purpose of providing prolonged therapy for the treatment of conjunctivitis.

Antibiotics protect against EAE by increasing regulatory and anti-inflammatory cells.

A seven day pretreatment course of an oral antibiotic cocktail (Ampicillin, Metronidazole, Neomycin Sulfate, and Vancomycin) was shown to induce changes in peripheral immune regulation and protect mice from signs of experimental autoimmune encephalomyelitis (EAE). To determine if a shorter course of antibiotic pretreatment could also protect the mice from EAE and induce regulatory immune cells, studies were conducted using the same oral antibiotic cocktail for three days. In addition, the CNS was examined to determine the effects of antibiotic pretreatment on EAE disease course and immune modulation within the affected tissue. The shorter three day pretreatment course was also significantly protective against severe EAE in C57BL/6 mice. Moreover, our study found increased frequencies of regulatory cells and a decrease in the frequency of anti-inflammatory macrophages in the spleen of EAE protected mice. Additionally, a chemokine and chemokine receptor array run on mRNA from spinal cords revealed that genes associated with regulatory T cells and macrophage recruitment were strongly upregulated in the antibiotic pretreated mice. Additional RT-PCR data showed genes associated with anti-inflammatory microglia/macrophages were upregulated and pro-inflammatory genes were downregulated. This suggests the macrophages recruited to the spinal cord by chemokines are subsequently polarized toward an anti-inflammatory phenotype. These results lend strong support to the conclusion that a three day course of antibiotic treatment given prior to the induction of severe EAE profoundly protected the mice by inducing regulatory lymphocytes in the periphery and an anti-inflammatory milieu in the affected spinal cord tissue.

Evaluation of the effect of antimicrobials in marine cultures, using the copepod Acartia tonsa as a bioindicator

ABSTRACTCultures of the copepod Acartia tonsa are used both in aquaculture and ecotoxicology studies. However, the cultivation of these crustaceans at high densities results in the proliferation of microorganisms that can affect the organisms of interest, leading to illness or death. Antimicrobials inhibit microbial growth and may favour the cultivated species, aiding the development of ecological studies. This study investigated the potential of antimicrobials (antibiotic + antifungal) to inhibit bacteria and fungi when applied to marine zooplankton cultures, using the copepod A. tonsa as a bioindicator of acute toxicity. Treatment with 0.025 g L−1 of penicillin G potassium + 0.08 g L−1 of streptomycin sulphate + 0.04 g L−1 of neomycin sulphate + 0.005 g L−1 of nystatin resulted in 95% bacterial inhibition (after 12 h of exposure); however, after this time, the inhibitory effect was lost. The antimicrobial combination tested in this study prevented colonisation by fungi until 168 h after exposure, without causing acute toxicity to A. tonsa. Thus, it has potential for use in marine cultures of less sensitive organisms.

Inhibition of biofilm bacteria and adherent fungi from marine plankton cultures using an antimicrobial combination

The presence of organic matter in plankton cultures will lead to 10- to 1000-fold increases in bacterial density in less than 24 h. The presence of bacteria and fungi can damage cultivated phytoplankton and zooplankton. These microorganisms can also inhibit experiments investigating the role of these microorganisms in the community and in biological and ecological laboratory studies. The aim of this study was thus to evaluate the effect of penicillin + streptomycin + neomycin (antibiotics) in combination with nystatin (antifungal) to select an antimicrobial combination for the inhibition of biofilm bacteria and adherent fungi that is effective and also non-toxic to marine phytoplankton and zooplankton. Acartia tonsa was exposed to different antimicrobial treatments and application routes (culture medium, culture food, both) to evaluate the survival and egg and fecal pellet production endpoints. The same treatments were also applied to measure Amphibalanus improvisus survival and settlement and Conticribra weissflogii growth endpoints. We selected the most sensitive experimental organism and exposed it to some novel antimicrobial combinations. To evaluate the inhibition potential, biofilm bacteria and adherent fungi were exposed to the treatments that were safe for the bioindicator species. A tonsa was considered the most sensitive of all tested organisms. The treatment composed of 0.025 g L−1 penicillin G potassium + 0.08 g L−1 streptomycin sulfate + 0.04 g L−1 neomycin sulfate showed the best results for A. tonsa and C. weissflogii cultures. No differences were observed for A. improvisus between the treatments. A. tonsa survival rates showed no differences from the control at nystatin concentrations up to 0.005 g L−1 in combination with the antibiotics. The biofilm bacterial density decreased up to 94% under this treatment, and fungal growth was prevented. Species of other planktonic groups should also be tested to improve our understanding of the effectiveness of the treatments proposed.

Клінічне значення хронічного ендометриту у жінок зі зниженою відповіддю на стимуляцію яєчників у програмі екстракорпорального запліднення

The objective: determination of the frequency of detection, risk factors, diagnostic criteria for chronic endometritis in poor responders patients in ART cycles with the study of the effectiveness of the proposed regimens for the treatment of this pathological condition. Materials and methods. A clinical study of the diagnosis of chronic endometritis in in poor responders patients have been conducted to develop individual approaches to overcoming infertility in a given cohort of women, taking into account not only the ovarian reserve, but also the endometrial status, assessed by clinical, instrumental and laboratory research methods, for achievement of successful implantation and ongoing pregnancy. The control group of women included 93 patients with infertility, a normal ovarian response to stimulation and lack of criteria for bad defendants. Results. As a result of a study conducted in poor responders patients, there is a significant percentage of the presence of chronic endometritis, which greatly complicates the overcoming of infertility. Risk factors for the occurrence of this pathological condition are genital tract infections, surgical intervention, intrauterine manipulations. Diagnostic criteria for chronic endometritis in women with infertility are micropolips, stomach edema, local and diffuse congestion of the endometrium during hysteroscopic examination and high expression of the imunohistochemical marker CD-138. Conclusion. The treatment protocol of the first line of chronic endometritis – docxicillin 100 mg 2 times a day 14 days, neomycin sulfate 35 000 MU, polymyxin B sulfate 35 000 MU, nystatin 100 000 MU for 1 suppositirium 1 time per day for 10 days and diclofenac 100 mg rectally for 5 days – is effective in 67.5% of cases . In patients who are resistant to previous antibiotic therapy, the second line treatment regimen is – сefotaxime 2.0 i /v 1 time per day, gentamycin 80 mg 3 times a day in / m, metronidazol 100 ml per day i / v, and diclofenac 100 mg rectally once daily for 7 days – the effectiveness of the treatment of chronic endometritis reached 79.1% of the cases. Key words: chronic endometritis, infertility, poor responders, ART.

EVALUACIÓN DE RÍOS DEL VALLE DE CULIACÁN, MÉXICO, COMO RESERVORIOS DE SEROTIPOS DE Salmonella RESISTENTES A ANTIBIÓTICOS

Salmonella es una de las principales causas de gastroenteritis bacteriana y se ha reportado su presencia y sobrevivencia en ecosistemas acuaticos. Esto, aunado al uso indiscriminado de antibioticos en actividades humanas y agropecuarias, podria favorecer la aparicion y diseminacion de cepas resistentes en estos ambientes. Por ello, el objetivo de este trabajo fue determinar la resistencia a antibioticos (RA) en 111 cepas de Salmonella clasificados en 28 serotipos no tifoideos, aislados de rios del noroeste de Mexico. Se utilizo el metodo de difusion en disco para la evaluacion de un panel de 16 antibioticos, segun lo recomendado por el Instituto de Estandares Clinicos y de Laboratorio. El 50.5 % (56/111) de las cepas fueron resistentes al menos a un antibiotico y el 41.1 % (23/56) de las cepas presentaron multirresistencia. La mayoria (87.5 %) de los serotipos presentaron RA, principalmente a ampicilina, neomicina, y cloranfenicol. El antibiograma revelo 26 patrones de RA entre las cepas de Salmonella . Los serotipos de Salmonella Oranienburg y Saintpaul mostraron gran diversidad de patrones de RA. Estos hallazgos mejoran el conocimiento sobre los serotipos de Salmonella RA de origen acuatico. Ademas, sugieren el riesgo potencial de que los rios del noroeste de Mexico sirvan como reservorios y fuentes de propagacion de esta bacteria entre diferentes hospederos o ambientes.

Short communication: Roles of outer membrane protein W (OmpW) on survival and biofilm formation of Cronobacter sakazakii under neomycin sulfate stress

Cronobacter sakazakii is associated with severe infections including sepsis, neonatal meningitis, and necrotizing enterocolitis. Antibiotic resistance in Cronobacter species has been documented in recent years, but the genes involved in resistance in Cronobacter strains are poorly understood. In this study, we determined the role of outer membrane protein W (OmpW) on survival rates, morphologic changes, and biofilm formation between wild type (WT) and an OmpW mutant strain (ΔOmpW) under neomycin sulfate stress. Results indicated that the survival rates of ΔOmpW were significantly reduced after half minimum inhibitory concentration (½ MIC) treatment compared with the WT strain. Filamentation of C. sakazakii cells was observed after ½ MIC treatment in WT and ΔOmpW, and morphologic injury, including cell disruption and leakage of cells, was more predominant in ΔOmpW. Under ½ MIC stress, the biofilms of WT and ΔOmpW were significantly decreased, but decreasing rates of biofilm formation in mutant strain were more predominant compared with WT strain. This is the first report to determine the role of OmpW on survival, morphological changes, and biofilm formation in C. sakazakii under neomycin sulfate stress. The findings indicated that OmpW contributed to survival and reduction of morphological injury under neomycin sulfate stress. In addition, enhancing biofilm formation in ΔOmpW may be an alternative advantage for adaptation to neomycin sulfate stress.

A SERS-based multiple immuno-nanoprobe for ultrasensitive detection of neomycin and quinolone antibiotics via a lateral flow assay.

The authors describe an ultrasensitive method for simultaneous detection of neomycin (NEO) and quinolones antibiotics (QNS). It is based on the use of (a) two immuno-nanoprobes (a probe for NEO and a probe for QNS), (b) surface-enhanced Raman scattering (SERS) detection, and (c), a portable lateral flow assay (LFA). The two probes consist of gold nanoparticles (AuNPs) conjugated to the Raman active molecule 4-aminothiophenol (PATP), and to monoclonal antibody against NEO (NEO mAb) or against NOR (NOR mAb). Quantitative detection of NEO and QNS was realized via SERS of the PATP-coated AuNPs captured in the test line of a LFA. Under optimized condition, the visual limits of LFA are 10ng·mL-1 for NEO and 200ng·mL-1 for NOR, and with LODs down to 0.37pg·mL-1 and 0.55pg·mL-1 by using SERS. The NEO test line is not interfered by the NEO analogues gentamycin, streptomycin and tobramycin, but the NOR test line suffers from different degrees of cross-reactivity (CR) to 12 common other QNS, the CRs ranging from 1.5% to 136%. The recoveries of NEO and NOR from spiked milk samples ranged between 86% and 121%, with relative standard deviations (RSD) from 3% to 6%. The method is highly sensitive, accurate and effective. It may be applied to simultaneous detection of NEO and 8 QNS, including NOR, enoxacin, ciprofloxacin, ofloxacin, fleroxacin, marbofloxacin, enrofloxacin, and pefloxacin. Graphical abstract Schematic of a lateral flow assay (LFA) based on an indirect competitive model. By using two test lines, the LFA can detect the neomycin and quinolones antibiotics simultaneously. Based on the surface-enhanced Raman scattering (SERS), the LFA shows high sensitivity to antibiotics with low limit of detection.

Role of neomycin polymyxin sulfate solution bladder wash for prevention of catheter associated urinary tract infection in traumatic brain injury patient admitted to Intensive Care Unit: A prospective randomized study.

Background:Catheter - associated urinary tract infection (CAUTI) remains a critical threat for patients in intensive care unit especially in traumatic brain injury patients with low Glasgow coma score (GCS). Almost all patients in ICU receive antibiotic either prophylactic or therapeutic based on local antibiogram of particular ICU or hospital. For prophylaxis, systemic antibiotics are used. It will be helpful to avoid systemic side effects by introducing antibiotics locally through bladder irrigation. The indwelling urinary catheter is an essential part of modern medical care.Aims and Objectives:The primary objective was to study the effect of Neomycin and Polymyxin sulphate solution for bladder wash on CAUTI in traumatic brain injury patients. The secondary objectives was to study the various organisms causing CAUTI and their antibiotic sensitivity and resistance pattern.Materials and Methods:This was a prospective randomized controlled study performed on 100 patients who met the inclusion criteria at the trauma intensive care unit of Banaras Hindu University between September and February 2016. The patients were randomized into two groups – one was the study group which received Neomycin and Polymyxin Sulphate solution bladder wash, while the other was the control group that received Normal saline bladder wash. Urine samples were collected at certain days and sent for culture and sensitivity.Results:There was significant reduction in the incidence of CAUTI in neomycin/polymyxin test group in comparison to normal saline irrigated control group. Out of 50 patients in test group 8 patients and in control group 26 patients was identified as CAUTI positive and they were statistically significant. In our study pseudomonas aeruginosa (51%) was the commonest isolated pathogen.Conclusions:Neomycin and Polymyxin Sulphate bladder wash was effective in preventing CAUTI. It can thus decrease the antibiotic usage thereby preventing the emergence of antibiotic resistance.

Development and Validation of New Analytical Method for the Estimation of Beclomethasone Dipropionate, Clotrimazole and Neomycin Sulphate in Bulk and Pharmaceutical Dosage Forms

Development and Validation of New Analytical Method for the Estimation of Beclomethasone Dipropionate, Clotrimazole and Neomycin Sulphate in Bulk and Pharmaceutical Dosage Forms

Development of an immunochromatographic lateral flow strip for the simultaneous detection of aminoglycoside residues in milk.

A colloidal gold-based immunochromatographic strip with a competitive format has been developed for the rapid, simultaneous, semi-quantitative and quantitative detection of several aminoglycoside residues in milk, including gentamicin sulfate (GM), neomycin sulfate (NEO) and kanamycin sulfate (KN). Three monoclonal antibodies against the three corresponding aminoglycosides were conjugated to colloidal gold particles and applied to the conjugate pads of the strip. The competitors [GM-bovine serum albumin (GM-BSA), NEO-BSA and KN-BSA conjugates] of GM, NEO and KN were immobilized onto a nitrocellulose (NC) membrane at three detection zones, T1, T2, and T3, respectively. The minimal cut-off values of the strip were 10 ng mL−1 for GM, and 100 ng mL−1 for NEO and KN, which are lower than the maximum residue levels (MRLs) established for aminoglycosides. The IC50 values of the strip were 0.737 ng mL−1, 8.971 ng mL−1 and 11.110 ng mL−1 for GM, NEO and KN respectively. In conclusion, the immunochromatographic lateral flow strip could be used for rapid, simultaneous, semi-quantitative and quantitative detection of GM, NEO and KN residues in milk.

Microbiological aspects of Escherichia coli in urinary tract infections in sows of commercial farms in Sinop-MT

Urinary infections (UI) in nuts are highly prevalent in modern intensive farming systems and cause significant economic losses, especially for reproductive failure and shortening the life of the array. The most frequently isolated agent is the bacterium Escherichia coli (E. coli). Variables such as environmental contamination pressure, management, nutrition, physiological and anatomical facilities and conditions of the animal itself are directly linked to illness. The objective of this work was to monitor microbiological urine nuts with suspected UI on commercial farms in the municipality of Sinop-MT, by counting of aerobic mesophilic total of Escherichia coli research and antimicrobial susceptibility profile. Urine samples with aerobic mesophilic total counts above 105UFC / mL were considered positive, confirming IU in 12 samples (28.57%) of the 42 females subjected to collections. Of the 42 urine samples, 305 were isolated colonies of Gram negative bacteria and through biochemical tests it was confirmed E.coli in 165 (54.09%) of these. In 37 (88.09%) of the 42 samples collected had involvement of E. coli, with or without other pathogens and all positive samples for UI by total aerobic mesophilic bacteria count showed. Through the antimicrobial susceptibility profile test, E. coli strains showed sensitivity to the following percentages: Gentamicin (100%), Streptomycin (98.70%), Neomycin (92.85%) Doxycycline (91.55%) , Enrofloxacin (80.51%), Sulfazotrim (64.28%), Ampicillin (62.97%), tetracycline (61.68%) and Amoxicillin (24.04%). The diagnosis of UI should be carried out thoroughly, assessing clinical and microbiological aspects, for the identification of the microorganism involved and the realization of antimicrobial susceptibility testing prevents the appearance of multi-resistant bacterial strains.

Preparation and characterization of chitosan–poly(vinyl alcohol)–neomycin sulfate films

The aim of our study was obtaining chitosan–poly(vinyl alcohol)–neomycin sulfate films (Cs–PVA–Ne) by using solvent casting technique and the characterization of the products. The films were analyzed by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy, thermogravimetry (TG and DTG), differential scanning calorimetry (DSC), contact angle (CA) measurements, mechanical, and antibacterial activity tests. FTIR and DSC analysis demonstrated that interaction between Cs, PVA, and Ne took place. Static water CA measurements showed an improvement in the hydrophilicity of the Cs–PVA–Ne films. Also, the drug-loaded films proved to have fairly good mechanical strength and significant effects against Staphylococcus aureus and Escherichia coli. The unloaded films show minimum bacterial inhibition (~ 10.00 mm) compared to drug-loaded films (~ 30.00 mm). The bacterial inhibition was higher in all the cases of S. aureus than E. coli. Furthermore, PVA was found to improve the films properties. Due to their physical–chemical and mechanical features and the excellent antibacterial properties, the obtained Cs–PVA–Ne films are suitable for their use as wound-dressing materials.

Inhibitory Properties of Neomycin Thin Film Formed on Carbon Steel in Sulfuric Acid Solution: Electrochemical and AFM Investigation

Our study aims to implement a strategy to reduce the carbon steel corrosion rate in a sulfuric acid solution, using an expired drug with adsorption affinity on the metal surface. To investigate the corrosion protection efficiency of an environmental friendly inhibitor, namely neomycin sulfate (NMS), the electrochemical measurements were applied on carbon steel immersed in 1.0 M H2SO4 solution with and without NMS. The protective layer that formed on the steel surface was studied by atomic force microscopy (AFM). The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) showed that the presence of the neomycin sulfate in acid solution leads to the decrease in corrosion current density (icorr) and the increase of polarization resistance (Rp). The mixed mechanism between physical and chemical adsorption of NMS molecules on the steel surface was proposed according to the Langmuir adsorption isotherm. AFM indicated that the NMS molecules contributed to a protective layer formation by their adsorption on the steel surface. The AFM parameters, such as root mean square roughness (Rq), average roughness (Ra), and maximum peak to valley height (Rp−v) revealed that in the presence of NMS a smoother surface of carbon steel was obtained, compared to the steel surface corroded in sulfuric acid blank solution.

Alternative Growth Promoters Modulate Broiler Gut Microbiome and Enhance Body Weight Gain.

Antibiotic growth promoters (AGPs) are frequently used to enhance weight-gain in poultry production. However, there has been increasing concern over the impact of AGP on the emergence of antibiotic resistance in zoonotic bacterial pathogens in the microbial community of the poultry gut. In this study, we adopted mass-spectrophotometric, phylogenetic, and shotgun-metagenomic approaches to evaluate bioactive phenolic extracts (BPE) from blueberry (Vaccinium corymbosum) and blackberry (Rubus fruticosus) pomaces as AGP alternatives in broilers. We conducted two trials with 100 Cobb-500 broiler chicks (in each trial) in four equal groups that were provided water with no supplementation, supplemented with AGP (tylosin, neomycin sulfate, bacitracin, erythromycin, and oxytetracycline), or supplemented with 0.1 g Gallic acid equivalent (GAE)/L or 1.0 g GAE/L (during the last 72 h before euthanasia) of BPE for 6 weeks. When compared with the control group (water only), the chickens supplemented with AGP and 0.1 g GAE/L of BPE gained 9.5 and 5.8% more body weight, respectively. The microbiomes of both the AGP- and BPE-treated chickens had higher Firmicutes to Bacteroidetes ratios. AGP supplementation appeared to be associated with higher relative abundance of bacteriophages and unique cecal resistomes compared with BPE supplementation or control. Functional characterization of cecal microbiomes revealed significant animal-to-animal variation in the relative abundance of genes involved in energy and carbohydrate metabolism. These findings established a baseline upon which mechanisms of plant-based performance enhancers in regulation of animal growth can be investigated. In addition, the data will aid in designing alternate strategies to improve animal growth performance and consequently production.

Association of the Addition of Oral Antibiotics to Mechanical Bowel Preparation for Left Colon and Rectal Cancer Resections With Reduction of Surgical Site Infections

ImportanceSurgical site infections (SSIs) after colorectal surgery remain a significant complication, particularly for patients with cancer, because they can delay the administration of adjuvant therapy. A combination of oral antibiotics and mechanical bowel preparation (MBP) is a potential, yet controversial, SSI prevention strategy.ObjectiveTo determine the association of the addition of oral antibiotics to MBP with preventing SSIs in left colon and rectal cancer resections and its association with the timely administration of adjuvant therapy.Design, Setting, and ParticipantsA retrospective review was performed of 89 patients undergoing left colon and rectal cancer resections from October 1, 2013, to December 31, 2016, at a single institution. A bowel regimen of oral antibiotics and MBP (neomycin sulfate, metronidazole hydrochloride, and magnesium citrate) was implemented August 1, 2015. Patients receiving MBP and oral antibiotics and those undergoing MBP without oral antibiotics were compared using univariate analysis. Multivariable logistic regression controlling for factors that may affect SSIs was used to evaluate the association between use of oral antibiotics and MBP and the occurrence of SSIs.Main Outcomes and MeasuresSurgical site infections within 30 days of the index procedure and time to adjuvant therapy.ResultsOf the 89 patients (5 women and 84 men; mean [SD] age, 65.3 [9.2] years) in the study, 49 underwent surgery with MBP but without oral antibiotics and 40 underwent surgery with MBP and oral antibiotics. The patients who received oral antibiotics and MBP were younger than those who received only MBP (mean [SD] age, 62.6 [9.1] vs 67.5 [8.8] years; P = .01), but these 2 cohorts of patients were otherwise similar in baseline demographic, clinical, and cancer characteristics. Surgical approach (minimally invasive vs open) and case type were similarly distributed; however, the median operative time of patients who received oral antibiotics and MBP was longer than that of patients who received MBP only (391 minutes [interquartile range, 302-550 minutes] vs 348 minutes [interquartile range, 248-425 minutes]; P = .03). The overall SSI rate was lower for patients who received oral antibiotics and MBP than for patients who received MBP only (3 [8%] vs 13 [27%]; P = .03), with no deep or organ space SSIs or anastomotic leaks in patients who received oral antibiotics and MBP compared with 9 organ space SSIs (18%; P = .004) and 5 anastomotic leaks (10%; P = .06) in patients who received MBP only. Despite this finding, there was no difference in median days to adjuvant therapy between the 2 cohorts (60 days [interquartile range, 46-73 days] for patients who received MBP only vs 72 days [interquartile range, 59-85 days] for patients who received oral antibiotics and MBP; P = .13). Oral antibiotics and MBP (odds ratio, 0.11; 95% CI, 0.02-0.86; P = .04) and minimally invasive surgery (odds ratio, 0.22; 95% CI, 0.05-0.89; P = .03) were independently associated with reduced odds of SSIs.Conclusions and RelevanceThe combination of oral antibiotics and MBP is associated with a significant decrease in the rate of SSIs and should be considered for patients undergoing elective left colon and rectal cancer resections.

A simple and selective resonance Rayleigh scattering-energy transfer spectral method for determination of trace neomycin sulfate using Cu2O particle as probe

The stable Cu2O nanocubic (Cu2ONC) sol was prepared, based on graphene oxide (GO) catalysis of glucose-Fehling's reagent reaction, and its absorption and resonance Rayleigh scattering (RRS) spectra, transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS) were examined. Using the as-prepared Cu2ONC as RRS probe, and coupling with the neomycin sulfate (NEO) complex reaction, a new, simple, sensitive and selective RRS-energy transfer (RRS-ET) method was established for detection of neomycin sulfate, with a linear range of 1.4–112μM and a detection limit of 0.4μM. The method has been applied to the detection of neomycin sulfate in samples with satisfactory results.