Materials and Methods (Continuation) Results (Continuation)

Slides:



Advertisements
Similar presentations
Aseptic Technique: Media and Equipment
Advertisements

Microbiological Methods
Sterilization and disinfection. Sterilization can be define as the process by which all forms of microbial life including bacterial spores & vegetative.
Predictive Model for Survival and Growth of Salmonella on Chicken during Cold Storage Thomas P. Oscar, Agricultural Research Service, USDA, Room 2111,
How To Prepare, Sterilize, AND Test Culture Media
Media preparation, sterilization and disinfectants
Lab Activity 7 IUG, Fall 2012 Dr. Tarek Zaida IUG, Fall 2012 Dr. Tarek Zaida 1.
Film Casting Formulation and method: Heat 7g absolute ethanol (70 °C), add 1.6g (90%w/w) protein, stir until dissolved. Add 2g distilled water, stir, then.
N=3, *,P
General Laboratory Procedures and Safety Considerations Dr.Abdel Hady Dr.Hany.
Microbiology Safety w Microbes are present everywhere. w Harmful microbes should not be allowed to grow and develop w PRECAUTIONS w All surfaces should.
Determination of MIC by Agar Diffusion Method. Minimum Inhibitory Concentration (MIC)  Definition: is the lowest concentration of an antimicrobial agent.
Microbiology and Cell Culture
Detecting Mutagens and Carcinogens. introduction - Increased number of chemicals used and present as environmental contaminats, testes for the mutagenicity.
PHT351 Sterile Dosage Form.
Lab 4: Determination of Aerobic colony count in Foods
EFFECTS OF FRACKING FLUID ON STAPH. EPIDERMIDIS AND E. COLI LUKE WEARDEN GRADE 11 CENTRAL CATHOLIC HIGH SCHOOL.
Microbiological Methods
Analysis of Bacterial Resistance Henry R. Walther Grade 11 Pittsburgh Central Catholic High School.
The Effect of Potassium Nitrate on Microbes By Liam O'Malley 9th Grade Central Catholic High School.
Antimicrobials from Lactobacillus plantarum isolated from turmeric (Curcuma longa linn.) and their applications as biopreservative and in edible film Melada.
SIBiol. The Microbial World Hands-On Session Day One Singapore Institute of Biology Workshop 30th - 31st May 2003.
Alex Senchak Grade 9 Central Catholic High School 1 Colloidal Silver Antibacterial Assessment.
Aseptic Technique: Media and Equipment. Growth Medium A growth medium or culture medium is a liquid or gel designed to support the growth of microorganisms.
4-2 Sources of DNA.
Culturing Yeast Cells on Media. Pre Lab Definitions: Petri Dish: A round, shallow dish used to grow bacteria. Culture: To grow living organisms in a prepared.
>>0 >>1 >> 2 >> 3 >> 4 >> Development and Characterization Chitosan blended Bacterial cellulose Film Proposed by Mr.Kampole Intasorn Thesis.
Reporter : Chang-Fu Lain Professor: Cheng-Ho Chen Date : 6/11.
Study the effect of industrial antibiotics on microbial growth.
HONEY ANTIMICROBIAL EFFECTS Alicia Grabiec Freeport Senior High School Grade 10.
The Antibacterial Effects of a Household Cleaner Greg Vojtek Central Catholic Pittsburgh Grade 9.
Microbial Count Aim: Count the number of bacterial cells in a provided sample Methods: Total count, Viable count I. Total count This technique involves.
Oil of Oregano Antibacterial Assessment 1 Alex Senchak Grade 10 Central Catholic High School.
Prepared by :Paras Shah Guided by :Dhaval sir.  Packaging is science, art and technology of enclosing or protecting products for distribution, storage,
Aquatic Thermal Tolerance of E.coli
Siddarth Narayan Grade 9 North Allegheny Intermediate High School.
Components Preparation Inoculation
Chromatography Chapter Dr Gihan Gawish. 1. Paper Chromatography Dr Gihan Gawish  Paper chromatography is a technique that involves placing a small.
Efficacy of a novel bactericide for elimination of biofilm in food processing facilities Tong Zhao Center for Food Safety University of Georgia For 3 rd.
Lab Activity 7 IUG, Fall 2012 Dr. Tarek Zaida IUG, Fall 2012 Dr. Tarek Zaida 1.
Tubes centrifuged at room temperature for 10,000 rpm for 10 mins (to precipitate bacterial cells) (Control) E.coli (24h old culture) a loopful /tube was.
Microbial Biotechnology Reem Alsharief Lab 3. General Methods of Isolation and selection of Microorganism Microbial isolation: To separate (a pure strain)
Microbiological Methods
The analysis of essential oils contained in the different sage (Salvia L.) species by means of TLC/densitometry M. Sajewicz 1, Ł. Wojtal 1, D. Staszek.
THIN LAYER CHROMATOGRAPHY.
Lee Sung Yong Department of Bioscience and Biotechnology Inhibition of pork and fish oxidation by a novel plastic film coated with horseradish extract.
Evaluation of chemical immersion treatments to reduce microbial counts in fresh beef Ahmed Kassem1, Joseph Meade1, Kevina McGill1, James Gibbons1, James.
Effects of E-vapor Juice on Microbial Flora
Absorbent pads fortified with thymol or carvacrol
Isolation of Soil Streptomycetes From Gaza
Effects of Ethyl Alcohol on Microbial Survivorship
Karwan Yaseen Kareem (GS34295) Supervisory committee
D and Z values determination
Practical Medical Bacteriology
Marine Biotechnology Lab
Conc. of metal ions (mg/g)
Microbial Survivorship in River Water
Lab Activity 4 IUG, Fall 2017 Dr. Tarek Zaida.
Pure Culture Techniques
ANTIBIOTIC SENSITIVITY
Learning Objectives i Understand the basic aseptic techniques used in culturing organisms. ii Understand the principles and techniques involved in culturing.
BASICS OF SUPERCRITICAL FLUID CHROMATOGRAPHY
VAPOUR PHASE CHROMATOGRAPHY
Lab Activity 4 IUG, Fall 2017 Dr. Tarek Zaida.
Chromatography Daheeya Alenazi.
The effect of 2-Butoxyethanol on microbial life
The Effect of Fertilizers on Microbial Survivorship
Lead Nitrate Suppression of Staph. E Biofilm Formation
Disinfectant Wipe Extract Effects on Bacteria
D and Z values determination
Presentation transcript:

Materials and Methods (Continuation) Results (Continuation) Antibacterial properties of carvacrol and cinnamaldehyde released from solution blow spun fish skin gelatin nanofibers Fei Liu1, Furkan Türker Saricaoglu1, David Bridges2, Roberto J. Avena-Bustillos1, Gary Takeoka1, Vivian Wu2, and Tara H. McHugh1 1Healthy Processed Foods Research, and 2Produce Safety and Microbiology Western Regional Research Center, Agricultural Research Service, USDA, Albany, CA 94710 Introduction Materials and Methods (Continuation) Results (Continuation) Nanofibers have been examined for controlled release of drugs and bioactive agents. The primary advantage of nanofibers over larger diameter fibers is larger surface area to volume ratios. Nanofibers can be produced from natural polymers derived from agriculture products and food-grade solvents. Solution blow spinning (SBS) is a novel and practical technique to produce nano- and microfibers. Gelatin nanofibers can be produced by SBS and used as carriers for controlled release of antioxidants and antimicrobials. Chemical analysis of nanofibers and films Nanofibers sealed in Petri dishes were stored at refrigeration until testing. Carvacrol and cinnamaldehyde were extracted from HMWFG nanofibers with ethanol and dichloromethane respectively and their concentrations determined with an Agilent 6890 GC with a flame ionization detector and a DB-5 bonded-phase fused-silica capillary column. The injector and detector temperatures were 220 °C and 250 °C, respectively. The oven temperature was programmed from 80 °C to 165 °C at 6 °C/min. The linear velocity of the helium carrier gas was 38.2 cm/s (80 °C). Antibacterial analysis of nanofibers and films Frozen stock cultures of E. coli O157:H7, S. enterica, and L. monocytogenes were activated in Trypticase Soy Broth (TSB) and incubated at 37 °C for 24 h. 70 mL of sterilized Trypticase Soy Agar (TSA) media firstly poured into Petri dishes and dried for 5 min in a biosafety hood. After drying, 10-20 mg of fibers were settled on the agar applying slight pressure to avoid breaking the agar gel. Activated cultures were diluted 2 times with peptone water and 0.1 mL of second dilution was mixed with 10 mL of sterilized TSA and poured immediately on the first agar layer, and incubated at 37 °C for 24 h. Each fiber was analyzed in triplicate for each strain. For vapor phase analysis, Petri dish lids were covered with 30-40 mg fibers, and fibers were slightly pressed with a spatula in order to stick them to lids. 14 mL of sterilized TSA were poured into dishes and dried in hood without closing the lids. After drying 0.1 mL of second dilution were spread on to agar and then with lids down were closed. All dishes were covered with Parafilm in order to inhibit vapors leaking out. Each fiber was analyzed in duplicate for each strain. Antibacterial analysis of nanofibers and films (continuation) Antibacterial diffusion activity of fish gelatin nanofibers and films Cinnamaldehyde nanofibers Cinnamaldehyde films   Mean Dia., mm Std. Dev. E. coli C 0.00 E-5 7.38 1.05 E-10 8.46 1.80 E-15 20.46 1.67 E-20 23.62 2.28 E-25 27.38 2.26 E-30 29.08 3.21 Salmonella typhimurium 6.33 0.30 10.73 0.53 13.20 0.71 18.20 1.24 19.67 0.65 2.11 22.46 2.49 Listeria monocytogenes 4.66 0.37 9.00 1.57 18.79 1.09 33.92 4.44 37.28 2.47 45.61 2.64 46.91 3.83   Mean Dia., mm Std. Dev. E. coli C 0.00 E-5 5.16 0.08 E-10 15.48 0.37 E-15 21.33 3.65 E-20 28.44 2.45 E-25 34.04 2.32 E-30 34.31 1.71 Salmonella typhimurium 9.76 0.70 17.95 2.31 19.93 1.03 21.50 1.76 25.26 1.19 29.24 0.84 32.25 1.31 Listeria monocytogenes 7.05 0.33 16.24 0.60 20.21 0.40 26.76 1.04 31.21 0.74 32.51 0.54 44.38 1.94 Objective This study evaluated antibacterial properties of carvacrol and cinnamaldehyde against three pathogenic bacteria E. coli O157:H7, S. enterica, and L. monocytogenes as released by diffusion and vapors from SBS nanofibers. Materials and Methods High molecular weight fish skin gelatin (HMWFG) at 16.5% (w/v) was solubilized in 20% (v/v) acetic acid solution. Carvacrol and cinammaldehyde was added at 5-30 % concentrations respectively, based on HMWFG weight, with lecithin at 5% in emulsions produced by microfluidization. SBS was done at a flow rate of 0.1 mL/min and 0.38 MPa air pressure. For film casting, solutions were degassed and 60-65 mL of film forming solution was cast onto glass plates lined with polyester film (Mylar) using a metallic draw down bar at a thickness of 45 mils. The films were allowed to dry for 15 h at room temperature, and then stored in a plastic bag at refrigerator until they were used for testing. Cinnamaldehyde nanofibers, vapor phase Carvacrol nanofibers, vapor phase Solution blow spinning experimental set-up Results Chemical analysis of nanofibers and films Cinnamaldehyde films, vapor phase Carvacrol films, vapor phase Antibacterial activity by vapor phase release from fish gelatin nanofibers and films Conclusions SBS of HMWFG nanofibers resulted in higher losses of carvacrol and cinnamaldehyde than by film casting. All nanofibers and films showed antibacterial activity by diffusion and vapor release at all concentrations of carvacrol and cinnamaldehyde for the three pathogenic bacteria. Bacterial inhibition area increased as concentrations of carvacrol and cinnamaldehyde were increased in the HMWFG formulations. Cinnamaldehyde was more volatile and potent antibacterial released as vapor than carvacrol from the HMWFG nanofibers and films. Gelatin nanofibers produced by solution blow spinning and casted films proved to be effective carriers of antibacterials with promising applications in food systems. Antibacterial analysis of nanofibers and films Antibacterial diffusion activity of fish gelatin nanofibers and films Carvacrol nanofibers Carvacrol films   Mean Dia., mm Std. Dev. E. coli C 0.00 E-15 19.47 2.92 E-20 15.36 2.20 E-25 14.37 0.11 E-30 12.15 2.05 Salmonella typhimurium 6.33 0.30 11.34 1.38 13.91 0.64 12.73 1.37 11.91 2.67 Listeria monocytogenes 8.37 0.44 19.79 1.58 16.00 3.95 15.25 0.31 11.31 0.95   Mean Dia., mm Std. Dev. E. coli C 4.73 6.68 E-15 21.03 0.47 E-20 30.99 5.38 E-25 35.42 2.29 E-30 40.30 0.40 Salmonella typhimurium 9.29 1.53 12.25 0.25 13.59 0.42 14.67 0.68 13.92 1.54 Listeria monocytogenes 15.70 1.70 25.77 0.23 26.77 0.36 36.97 0.61 27.84 20.81 Acknowledgment This project is supported by Agriculture and Food Research Initiative Nanotechnology for Agricultural and Food Systems Grant Program 2013-01598 from the USDA National Institute of Food and Agriculture.