Procedure for Acidifying Salsa Food Safety Scientist Curriculum © 2014 Board of Regents, South Dakota State University iGrow.org This project was supported.

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Presentation transcript:

Procedure for Acidifying Salsa Food Safety Scientist Curriculum © 2014 Board of Regents, South Dakota State University iGrow.org This project was supported by the USDA NIFA grant number

iGrow.org Lab Safety Protocol Lab coat is advised Wash hands before and after handling raw vegetables – Gloves are advised Keep long hair tied back away from face Wear closed toe shoes © 2014 Board of Regents, South Dakota State University iGrow.org

iGrow.org Salsa & Food Preservation What is pH? The measure of the acidity of food. It is measured on a scale of The lower the pH the higher the acidity. The Importance of pH The pH level of homemade salsa is important when preserving the salsa over extended periods of time to prevent the growth of unwanted microorganisms. © 2014 Board of Regents, South Dakota State University iGrow.org

iGrow.org What are the Safety Concerns of Heat Processed Salsa? The pH of food determines the type of heat processing used Less than 4.6: High Acid Food – processed using a boiling water bath. Greater than 4.6: Low Acid Food – must be processed using a pressure canner The pH of the combined vegetables in salsa are often greater than 4.6 Therefore salsa has acid added to it. It is therefore considered an acidified food – processed in a boiling water bath. Acetic acid (vinegar) or lemon juice are often added to lower the pH well below 4.6 If recommended heat processing is not used, the jar of salsa stored on the grocery store shelf, or in your home cupboard, can support the growth of potentially harmful bacterium, Clostridium botulinum © 2014 Board of Regents, South Dakota State University iGrow.org

iGrow.org Ingredients 2 Green Bell Peppers, diced 1 Jalapeno Pepper*, diced 2 Ripe Tomatoes, diced 3 Cloves Garlic, minced 1 White Onion, diced ½ bunch Cilantro, chopped One Can Corn or Black Beans *If you have a adverse reaction to Jalapeno peppers, or other items in this recipe, do not handle any of the ingredients. Wear gloves when handling Jalapeno peppers. Recipe makes 4 cups of salsa © 2014 Board of Regents, South Dakota State University iGrow.org

iGrow.org Making Salsa: Procedure Blanch the tomatoes by placing them in boiling water for 2 minutes After 2 minutes place the tomatoes in ice water to easily peel the skin off the tomatoes © 2014 Board of Regents, South Dakota State University iGrow.org Preparing Fresh Salsa

iGrow.org Making Salsa: Procedure 1. Combine diced peppers, tomatoes, garlic, onion & cilantro in a bowl 2. Obtain a sample by transferring 1 cup of the sample to a food processors. Puree or liquify the sample until it is uniform in texture. © 2014 Board of Regents, South Dakota State University iGrow.org * Why is it important to homogenize the sample before testing the pH?

iGrow.org Making Salsa: Procedure 3. After the mixture is pureed, place ½ cup into a sample dish and test the pH using a calibrated pH meter 4. If the pH meter reads above 4.6, the salsa will not meet the standard that keeps Clostridium botulinum from growing when heat processed (canned) in a jar. © 2014 Board of Regents, South Dakota State University iGrow.org

iGrow.org What can be added to change the pH of salsa? To reduce the pH of salsa an ingredient with a low pH (highly acidic) liquid must be added Two common ingredients are: © 2014 Board of Regents, South Dakota State University iGrow.org pH: pH: What are other ways to alter the pH of a homemade salsa recipe?

iGrow.org Acidifying Salsa Add the lemon juice or acetic acid, 2 mL at a time, to the ½ cups sample Record the resulting pH after each addition (refer to the next slide) Continue until a reading of 4.6 or below is reached. Use the chart on the following slide to assist in keeping track of amount of acid added and the resulting pH. © 2014 Board of Regents, South Dakota State University iGrow.org

iGrow.org Chart to record data © 2014 Board of Regents, South Dakota State University iGrow.org Salsa sample – ½ cup pureed by food processor Acid Added (mL)pH Meter Reading 0 mL 2 mL 4 mL 6 mL 8 mL

iGrow.org Conversions If the beakers or graduated cylinders are unavailable, household items such as measuring spoons can be used. The following conversions include: © 2014 Board of Regents, South Dakota State University iGrow.org Sample (mL) Conversion to Tablespoons/ Teaspoons 2 mL1/2 tsp. 10 mL2 tsp. 15 mL1 TBS. 25 mL2 tsp. + 1 TBS.

iGrow.org Why is acid important in food preservation? Microorganisms grow within a certain pH range. If the pH remains below 4.6. the deadly microogranism Clostridium botulinum will not be able to grow. © 2014 Board of Regents, South Dakota State University iGrow.org