Food additives
-
Upload
gloriaganxona -
Category
Education
-
view
211 -
download
2
description
Transcript of Food additives
FOOD ADDITIVES
Why do we use additives more now than we did in the past?
WE WANT WHOLESOME FOOD WITH……
High in nutritional value Good taste Long shelf life Safe Sensory pleasing
CONDITIONS THAT AFFECT WHOLESOMENESS
Temperature Sanitation Storage Packaging Age Preservation techniques
WHAT ARE FOOD ADDITIVES?
Food additives are substances added to food to preserve flavor or enhance its taste and appearance.
Food Additives can be intentional or unintentional
FUNCTIONS
Prolong shelf life Change/preserve colorEnhance flavor Improve nutritional valueCompensate for vitamin and mineral
deficienciesMaintain freshnessPrevent spoilingFacilitate food processing
BENEFITS OF FOOD ADDITIVES
Reduce food spoilageMaintain nutrient qualityLower food costsReduce occurrence of disease
WHY NOT KEEP TO NATURAL ADDITIVES?
Some artificial colours have almost disappeared from foods being identified as harmful.
No sufficient variety of natural additives required to perform all the required functions of additives.
Manmade additives may prove more efficient at preserving
Some natural colours fade in some products.
NUMBERING OF ADDITIVES
Each additive is assigned a unique number, termed as "E numbers“ which is used in Europe for all approved additives. This numbering scheme has now been adopted and extended by the Codex Alimentarius Commission
E 100 – Curcumin, turmericE 123 – AmaranthE 140 – Chlorophylls, ChlorophyllinE 210 – Benzoic acidE 224 – Potassium metabisulphiteE 300 – Ascorbic acidE 330 – Citric acid
TYPES OF ADDITIVES
Natural – found naturally, such as extracts from beetroot juice (E162), used as a colouring agent;
Manmade versions – synthetic identical copies of substances found naturally, such as benzoic acid (E210), used as a preservative;
Artificial – produced synthetically and not found naturally, such as Nisin (E234), used as a preservative in some dairy products and in semolina and tapioca puddings.
CATEGORIES OF FOOD ADDITIVES
ACIDS
Food acids are added to make flavors "sharper", and also act as preservatives and antioxidants.
Common food acids include vinegar, citric acid, tartaric acid, malic acid, fumaric acid, and lactic acid.
ACIDITY REGULATORS
Acidity regulators are used to change or otherwise control the acidity and alkalinity of foods.
Examples --- Acetic acid, Citric acid
ANTIFOAMING AGENTS
Antifoaming agents reduce or prevent foaming in foods.
Examples -- polydimethylsiloxane (a type of silicone). Silicone oil is also added to cooking oil to prevent foaming in deep-frying.
ANTICAKING AGENTS
Anticaking agents keep powders such as milk powder from caking or sticking.
Examples -- Sodium bicarbonate (E500), Calcium silicate (E552), Sodium aluminosilicate (E554), Bentonite (E558)
ANTIOXIDANTS
Antioxidants act as preservatives by inhibiting the effects of oxygen on food, and can be beneficial to health.
Examples – Ascorbic acid (Vit C), Tocopherols (Vit E)
BULKING AGENTS
Bulking agents such as starch are additives that increase the bulk of a food without affecting its nutritional value.
FOOD COLORING
Colorings are added to food to replace colors lost during preparation, or to make food look more attractive.
Natural colorants are Caramel coloring (E150), Annatto (E160b), chlorophyll (E140), Cochineal (E120), Betanin extracted from beets, Turmeric (curcuminoids, E100), Grape Skin Extract etc.
Synthetic colorants are FD&C Blue No. 1 – (E133), FD&C Green No. 3 (E143), FD&C Red No. 40 (E129) etc.
COLOR RETENTION AGENTS
In contrast to colorings, color retention agents are used to preserve a food's existing color.
Example – Ascorbic acid (E300)
EMULSIFIERS
Emulsifiers allow water and oils to remain mixed together in an emulsion, as in mayonnaise, ice cream, and homogenized milk.
FLAVOURS
Flavours are additives that give food a particular taste or smell, and may be derived from natural ingredients or created artificially.
FLAVOR ENHANCERS Flavor enhancers enhance a food's existing
flavors. They may be extracted from natural sources (through distillation, solvent extraction, maceration, among other methods) or created artificially. E620 Glutamic acid E621 Monosodium glutamate, MSG E622 Monopotassium glutamate
FLOUR TREATMENT AGENTS
Flour treatment agents are added to flour to improve its color or its use in baking. azodicarbonamide (E927) carbamide (E927b)
GLAZING AGENTS
Glazing agents provide a shiny appearance or protective coating to foods. Stearic acid (E570) Beeswax (E901) Candelilla wax (E902)
HUMECTANTS
Humectants prevent foods from drying out. Examples – glycerol/propylene glycol
(E1520), and glyceryl triacetate (E1518), sorbitol (E420)
PRESERVATIVES
Preservatives prevent or inhibit spoilage of food due to fungi, bacteria and other microorganisms.
STABILIZERS
Stabilizers, thickeners and gelling agents, like agar or pectin (used in jam for example) give foods a firmer texture. While they are not true emulsifiers, they help to stabilize emulsions.
SWEETENERS
Sweeteners are added to foods for flavoring. Sweeteners other than sugar are added to keep the food energy (calories) low, or because they have beneficial effects for diabetes mellitus and tooth decay and diarrhea.
Some sugar substitutes are natural and some are synthetic. Those that are not natural are, in general, called artificial sweeteners.
Examples -- stevia, aspartame, sucralose, neotame, acesulfame potassium, and saccharin
THICKENERS
Thickeners are substances which, when added to the mixture, increase its viscosity without substantially modifying its other properties.
Example -- arrowroot, cornstarch, potato starch, sago, tapioca, vegetable gums (guar gum, locust bean gum, and xanthan gum, protein (Proteins used as food thickeners include collagen, egg whites etc.
ACKNOWLEDGEMENT
All the photographs and graphics used in the slides are downloaded versions from web. Thanks to those creators for their brilliant works