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Applied and Industrial Applied and Industrial MicrobiologyMicrobiology

Microbiology 2314

Early MethodsEarly Methods

Smoking

- Dries the Food

- Enhances the Flavor

- Beef, Ham, Bacon, Fish

- Adds Formadehyde

Ham's substantial, ham is fatHam is firm and sound.Ham's what God was getting atWhen He made pigs so round----- Roy Blount Jr.


Drying/Dessication/Dehydration

- Sun / Wind / Ovens

- Meat and Fruit

Early MethodsEarly Methods• Salting

- Day-Salting and Pickling

- Rock Salt / Sea Salt / Spiced Salt

- Cheese / Olives / Hams / Eggs

Old recipe for Salt Curing Ham, this method can preserve a Ham for years.

For a 20 lb. ham: o 3 Tablespoons Brown Sugar o 2 Tablespoons Black Pepper o 1 Teaspoon Red Pepper o 2 Cups Salt

Mix the ingredients together and rub onto the skin-on ham, paying special attention to the hock. Then the ham is wrapped in paper, then wrapped in cloth, then placed in a cloth bag and hung with the hock down. The ham is hung in a well ventilated, dark and secure building. The ham "drips" for about two months and is ready to eat in about 6 to 9 months and is edible for 3 to 4 years. Hams continued to stay edible right up until they are completely dried out.

Where Else Has Salting Been Where Else Has Salting Been Used?Used?

• Mummification is the preservation of a body, either animal or human. The Egyptian mummies were deliberately made by drying the body. By eliminating moisture, you have eliminated the source of decay. They dried the body by using a salt mixture called natron. Natron is a natural substance that is found in abundance along the Nile river. Natron is made up of four salts: sodium carbonate, sodium bicarbonate, sodium chloride, and sodium sulfate. The sodium carbonate works as a drying agent, drawing the water out of the body. At the same time the bicarbonate, when subjected to moisture, increases the pH that creates a hostile environment for bacteria. The Egyptian climate lent itself well to the mummification process, being both very hot and dry.


Honey

- Preserving Fruit

- Healing

- High Sugar

Content

• HISTORY: • Besides being used as food, it was used as

medicine -- more than half remedies prescribed by Egyptian doctors contained honey. Ancient Egyptians, Greeks, and Romans spread honey on wounds to hasten their healing -- So, did German Field Medical personnel during World War I. Even as Late as 1970 in England, a surgeon announced he was using honey on open wounds after surgery -- and had fewer bacterial infections than similar wounds treated with antibiotics. Honey proved to be an effective disinfectant; It hastened healing; and bacteria did not develop resistance to it, as often happens with antibiotics.


Yogurt and Cheese Making to Preserve Milk

- Easier to Transport

- Lengthen Time Possible to Use

• A Legend

Legend tells that yoghurt was born on the slopes of Mount Elbrus in the Caucasus range of mountains, between the Black and Caspian seas. On the hot southern slopes a pitcher of milk belonging to a Turkish nomad was contaminated by a mixture of organisms that thrived in the warm milk (40 - 45c). The result was what the Turks call "yogurut". The name "yogurut" was supposedly introduced in the 8th century and was changed in the 11th century to the current version "Yoghurt". Legend suggests that Yoghurt can act as a preservative against human ageing, however no scientific evidence actually supports this theory. Undoubtedly a regular intake of the organisms found in yoghurt can have a beneficial affect to the digestive tract.


Cooling

- Collection of Snow and Ice

- Caves / Cellars

- Water Wells

Today We Use Some of the Same Today We Use Some of the Same Methods and Some New OnesMethods and Some New Ones

Industrial Food CanningIndustrial Food Canning

• Commercial Sterilization 1. Steam Under Pressure / Retort2. Minimum Temperature to Reduces Clostridium botulinum3. 12 D Treatment / Reduces by 12 Logarithmic Cycles4. 1012 1

Industrial Food CanningIndustrial Food Canning

• Commercial Sterilization

1. Endospores of Thermophiles can Survive

2. Storage > 45 ºC / Thermophiles

3. Gas Production / Swelling

4. No Gas / Flat Sour Spoilage

5. Mesophilic Bacteria / Improper Heating

6. Acidic Foods / 100 ºC / Survivors Can’t Stand

the Low pH

Picture of RetortPicture of RetortUsed in Commercial Sterilization Used in Commercial Sterilization and uses Steam Under Pressureand uses Steam Under Pressure

Keeping Cans Sealed Can Help Keeping Cans Sealed Can Help Keep Foods SafeKeep Foods Safe

Aseptic PackagingAseptic Packaging

Pre-sterilized materials are assembled into packages and aseptically filled with heat-sterilized liquid foods.

Radiation and Industrial Food Radiation and Industrial Food PreservationPreservation

RadiationRadiation

• Gamma Radiation

1. Used to Sterilize Food

2. Kill Insects & Parasitic Worms

3. Prevent Sprouting of Fruits and

Vegetables

Radiation Treatment of FoodsRadiation Treatment of Foods

Wheat Flour

White Potatoes

Pork

Fruit

Vegetables

Spices

Vegetable Seasonings

Poultry

Frozen Meat

Case Study Decatur, GeorgiaCase Study Decatur, Georgia

• In June 1988, a capsule of radioactive cesium-137-- a waste product from nuclear weapons production-- sprung a leak at a Radiation Sterilizers plant near Atlanta. Though the leak was contained to the site, two of the three exposed workers spread radioactivity to their cars and homes. And an estimated 70,000 milk cartons, contact lens solution boxes and other containers were shipped out after they were splashed with radioactive water. Only about 900 of the contaminated containers were recalled. The ensuing taxpayer-funded cleanup cost more than $30 million, after which a government report concluded that "the public health and safety could have been compromised."

Case Study Dover, NJCase Study Dover, NJIn June 1986, two senior executives of Palo Alto, CA-based International Neutronics were indicted on federal charges of conspiracy, mail fraud and wire fraud in connection with an October 1982 spill of 600 gallons of water contaminated by radioactive cobalt-60. After a pump malfunctioned, workers were instructed to pour the radioactive water down a shower drain that emptied into the public sewer system. Workers were also ordered to wear their radiation-detection "badges" in such a way to falsify radiation levels. In the words of a federal prosecutor, company executives "bamboozled" Nuclear Regulatory Commission (NRC) inspectors by delaying an inspection of the facility, where food, gems, chemicals and medical supplies were irradiated. A $2 million cleanup included the cost to dispose of radioactive material at a nuclear waste dump in South Carolina. Company vice president Eugene O'Sullivan, a former member of the U.S. Atomic Energy Commission, was convicted of conspiracy and fraud in October 1986.

Cheese forms Cheese forms when milk when milk protein casein protein casein curdles because curdles because of action by of action by lactic acid lactic acid bacteria or the bacteria or the enzyme renninenzyme rennin

Cheese is the curd separated from the liquid portion of milk, called whey.

Other Dairy ProductsOther Dairy Products1. Butter

2. Buttermilk

3. Sour Cream

4. Yogurt

Microbial FermentationsMicrobial Fermentations

Sugars in bread dough are fermented by yeast to ethanol and carbon dioxide; the carbon dioxide causes the bread to rise.

Sauerkraut, pickles, olives, and soy sauce are products of microbial fermentations

Alcoholic FermentationsAlcoholic FermentationsCarbohydrates are Fermented by Carbohydrates are Fermented by

Yeasts to Produce EthanolYeasts to Produce Ethanol

Industrial MicrobiologyIndustrial Microbiology

• Biotechnology

- The production of commercial

products through the use of living

organisms.

Industrial Industrial FermentationsFermentations

Utilize bioreactors which control aeration, pH, and temperature.

Industrial ProductsIndustrial Products

• Amino Acids in Food and Medicine

• Enzymes Used in Foods and Medicines

• Vitamins Used as Food Supplements

• Vaccines / Antibiotics / Steroids

• Ore Recovery / Uranium and Copper

• Yeasts / Wine and Bread

• Agricultural Microbes

FOOD MICROBE(S)Coffee A bacteria and a yeastCassave (Gari) A bacteria and a moldCassave: (Peujeum) Several moldsCorn (Kenkey) A couple of molds, a yeast and some

bacteriaCorn (Ogi) A couple of bacteria and a

yeastSoybeans (Miso) A mold and a yeast Soy Sauce Molds, yeast and bacteria mixture Peanuts (Ontjom) A moldRotted Shark Meat Buried in Ground Until Ready

(Icelandic treat)

OTHER COMMON FERMENTED FOODS

Alternative Energy SourcesAlternative Energy Sources

• Biomass

Organic waste that can be converted by

microorganisms into alternative fuels

• Bioconversion

The process of converting

microorganisms into alternative fuels

Methane ProductionMethane Production

“Bartertown is powered by an energy source that is, in its own way, a compelling argument against nuclear war: In chambers beneath Bartertown, countless pigs live and eat and defecate, and from their waste products, Turner's soldiers generate methane gas.”

EthanolEthanol

Quick FactsQuick Facts

• The level of interest in using alcohol as a motor fuel has followed cycles of fuel shortages and/or low feed-grain prices.

• Alcohols burn more completely, thus increasing combustion efficiency.

• Advantages of mixing alcohol with gasoline are that alcohol tends to increase the octane rating and reduce carbon monoxide emissions.

• Alcohols may corrode certain materials used in engines.

• Lift StationThe lift stations bring the initial sewage from Edmond wastewater lines into the plant.

• Bar ScreenThe bar screens remove large debris such as rags, sticks, plastics, roots, etc.

• Grit ChamberThe function of a grit chamber is to capture inorganic solids such as dirt and sand that cause wear to pumps and reduce space in process tanks.

• Distribution ChamberScrew PumpThis return sludge structure provides sludge pumping, flow rate control to primary oxidation ditch process, and mixing point for raw sewage and return sludge, i.e. Return Activated Sludge.

• Oxidation DitchesProvide mixing, oxygen transfer and retention time for microorganisms to convert organics to more stable compounds creating an activated sludge mixed liquor.

• ClarifiersProvide detention time for activated sludge to settle and be drawn off gradually and returned to be mixed with incoming raw sewage, known as Return Activated Sludge. The process also removes floatable materials by skimming. The effluent water from the clarifiers then goes to the sand filters for further treatment.

• Sand FiltersThese filters further aid in the removal of suspended particles, floating matter and BOD (Biochemical Oxygen Demand). BOD is a measurement of remaining organics that could cause pollution.

• Chlorination/De-chlorination BasinThe basin provides the point of chlorination, mixing, and contact time to destroy pathogenic organisms. The sulfur dioxide neutralizes the residue chlorine resulting in an environmentally safe effluent.

• Sonic Flow MeterThe meter measures the volume released into the watershed and is used to generate accurate numbers that are included in all reports to regulatory agencies..

• Discharge into Coffee Creek After treatment, the wastewater has fewer contaminants than the lake water before it is treated at the water treatment plant. At least 90% (and up to 98%) of the contaminants are removed before the treated wastewater is discharged into the creek. The Edmond Wastewater Treatment Plant has twice received the Plant of the Year Award for Large Wastewater Treatment Plants from the Oklahoma Water and Pollution Control Association.