Waxing fruits and vegetables can improve their appearance, prevent moisture loss, and extend their post-harvest life. There are various types of edible waxes that can be applied through methods like liquid paraffin wax, slab wax, spraying, or dipping. Waxes act as a protective barrier on the surface of produce. While waxing provides benefits like reduced decay and weight loss, it can also result in an artificial appearance or wax buildup. Waxes used are generally recognized as safe by the FDA but safety should still be maintained in coating operations. Waxing is an effective preservation technique for valued produce.
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Waxing Fruits or Fruit coating
1. Post harvesting operationsWaxing fruits and vegetables By KHALID Sayed Mohammad Naim SF2M-Master Student ISA Lille-France Dec 2010 Food Processing homework 1
3. Introduction External appearance vs. quality vs. market acceptance It is the first attribute. Shiny and glossy appearance. Various types of waxes and edible surface coatings may be applied to fruits and vegetables to improve the cosmetic features (shine, color) of the product. Waxing is recommended only for good quality products Waxing consists of applying a thin layer of edible wax to the outer surface of the product. Food Processing homework 3
10. PROPERTIES OF WAX ⹠Kneadableat 20° C. ⹠Easilyemulsifiable. ⹠Should not impart undesirable odour. ⹠Shouldbeeconomical. ⹠Efficient drying performance. ⹠Non-sticky or tacky. ⹠Should never interfere with the quality of fresh fruit / vegetable. ⹠Melts above 40° C without decomposition. ⹠Has relativelylowviscosity. ⹠Capable of being polished by slight pressure. ⹠Translucent to opaque form but not like glass. Food Processing homework 10
12. Waxing methods: 1. Liquid Paraffin wax method: In this method fruits and vegetables are dipped in hot paraffin. Some times resins are added. The main disadvantage of this method is too much of coating materialisused. 2. Slab wax method: (Roller Brushing) In this case the wax is pressed against rapidly revolving brushes. But the efficiencyisveryless. Food Processing homework 12
13. 3. Spray method: Spraying of melted wax on the fruit, which is subsequently brushed mechanically until a film of desired thickness is obtained. The wax is dissolved in a suitable solvent. This depends on, The pressure employed Volume of wax used Wax temperature Distance of fruit from the spray Numberof spray nozzles. 4. Dipping or cold wax method: Fruits and vegetables are washed and then without being dried are dipped into a wax emulsion of proper concentration. They are dried before packing. Purified wax is odour less, tasteless and nontoxic and it can be heat- sealed. Food Processing homework 13
15. Safety of waxes Food Processing homework 15 FDA ( it is generally accepted safe)
16. conclusion Coatingimprovesproductappearance and colour, coating is an effective method of value addition and preservation for the food product Continuous Mechanization is not available for various coating operations. Till now, many of the coating operations are doneby batch processing. Safety of food product should be maintained in the coating operations. Food Processing homework 16
17. References Lisa Kitinoja and Adel A. Kader . Small-ScalePostharvest Handling Practices: A Manual for Horticultural Crops. ( Nov 2003). UCDAVIS. Postharvest Horticulture Series No. 8E WAXING FRUITS AND VEGETABLES. ( June 2004). Postharvest Handling Technical Bulletin No. 33. http://pdf.usaid.gov/pdf_docs/PNACY849.pdf Preservation of fruits and vegetables by wax coating. (Aug 2006). http://www.techno-preneur.net/information-desk/sciencetech-magazine/2006/aug06/Preservation.pdf http://chillibreeze.in/rate-articles-get-your-writing-rated/feature-article/waxing-of-fruits-and-vegetables/