Chemical Additives as Food Preservatives
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M a y 6 , 2 0 2 2 1 ROLE OF CHEMICAL ADDITIVES IN FOOD PRESERVATIVES M.Sohail National Institute of Food Science & Technology, University of Agriculture, Faisalabad Pakistan
Transcript of Chemical Additives as Food Preservatives
April 11, 2023
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ROLE OF CHEMICAL ADDITIVES IN FOOD PRESERVATIVES
M.SohailNational Institute of Food Science & Technology,University of Agriculture, FaisalabadPakistan
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OUTLINE
Additives?Chemical additives as
preservativesAnti-ripening agentsSprout inhibitorsAntioxidantsChelating agentsAnti-microbial agents
Chemical additives and food laws
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Chemical Additives
“A chemical additive is a substance or a mixture of substances added intentionally for a technological purpose during manufacturing, preparation, treatment, packing, transport or storage”
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CHEMICAL ADDITIVES AS PRESERVATIVES
Chemical additives as preservatives may be used as anti-ripening agents, sprout inhibiters, anti-microbial agents and anti-oxidants.
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CHEMICAL ADDITIVES AS PRESERVATIVES
Anti-ripening agentsDelay ripening process by lowring
physiological functions in fruits an vegetables
Examples: Purafil used for plantain, 2,4,5-trichlorophenoxy acetic acid used for mango
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CHEMICAL ADDITIVES AS PRESERVATIVES
Sprout inhibitersOnion, carrots and potatoes more prone
to sprouting.More sprouting at 50-80 % R.H.
Examples include Methyl esters of naphthalene acetic acid, maleic hydride, propham, chloropropham, phenyl carbamate, vapours of nonylalcohal
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CHEMICAL ADDITIVES AS PRESERVATIVES
Anti-oxidantsSubstances that prevent the reaction of
various food constituents with oxygen thereby avoiding deterioration.
Specially in fats and oils, carotenoids, chlorophyll and heamoglobin.
Examples: BHA, BHT, α-tocopherol, isopropyl citrate mixture, L-ascorbic acid, sulpher dioxide
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CHEMICAL ADDITIVES AS PRESERVATIVES
Chelating agentsInactivate the metals which react with
food constituents, by binding them and forming complex
Contain two or more donor groups and form inner ring structure
Examples includes: EDTA, polyphosphates and citric acid
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CHEMICAL ADDITIVES AS PRESERVATIVES
Antimicrobial agents
Fumigants: Ethylene oxide, Ethyle formate
Anti-fungal: Dithane M45 for surface growth. Sodium salt of O-phenyl phenol for citrus fruits.
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CHEMICAL ADDITIVES AS PRESERVATIVES
Antimicrobial agents
Antibacterial agents: Sodium benzoat and patassiiuum metabisulphite
in soft drinks
Mold inhibiters: Sodium and calcium propeonats Sorbic acid for cheese
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Chemical additives and food laws
Food laws regulate the amount of chemicals allowed to add in specific foods
Sulpher dioxide: Can be added to a maximum of 1500 ppm in fruit
juice concentrates In squashes, syrup and sharbats, 350 ppm
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Chemical additives and food laws
Benzoic acid:Can be added to a maximum of 600 ppm
in syrups, sharbatsA maximum of 250 ppm in tamato puree
and paste
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