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study expands additives' effects on gelling properties
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food additives in alginate-based gel will affect the characteristics of the resulting gel, with new information from the us sure to help food scientists optimise formulations. understanding the key interactions of additives in a food matrix is vital for manufacturers seeking to develop new formulations or improve established ones, and the new research published in the journal of texture studies goes some way to filling in the gaps. researchers from north carolina state university studied the effects of dextran and glycerol on the rheological characteristics of alginate gels and found that the molecular size of an additive should be considered by formulators. “the inclusion of additives may affect physical and chemical properties of the gels, and subsequently, the rheological properties,” wrote the authors “rational optimization of product formulations and processing conditions of food gels depends on a better understanding of the impact of additives on processing and rheological properties,” they added. gelling agents fall under the hydrocolloids umbrella - ingredients used extensively by the food industry to texturise and stabilise food products from dressings to ice cream. though these products are sensitive to spiralling raw material costs, the demand for hydrocolloids remains impressive. the food industry's most frequently used hydrocolloids include: agar, alginates, arabic, carrageenan, carboxy methyl cellulose (cmc), gelatin, konjac flour, locust bean gum (lbg), methyl cellulose and hydroxypropyl methyl cellulose (mc/hpmc), microcrystalline cellulose (mcc), pectin, starch and xanthan. new information on addition of glycerol, a plasticiser commonly used to enhance the mechanical performance of food gels, the researchers report no effects on the gel-forming process, or the gel mechanical performance. “these observations indicated that the gel network remained unchanged with the addition of glycerol,” wrote the researchers. “in this alginate study, glycerol did not appear to have a plasticising effect because mechanical properties did not change with glycerol addition,” they added. for dextran, the north carolina-based researchers tested both low and high molecular weight (mw) types. while the low mw dextran was reported to have similar effects to glycerol, the high molecular weight dextran was found to change certain parameters associated with gel strength, including the a reduction in the so-called gel fracture stress and deformation properties. “this response was hypothesised as a result from the large dextran molecules affecting network structure, and not due to the influence of high mw dextran on liquid phase viscosity,” they stated. growth in the seaweed market according to leatherhead food international (lfi), alginates are predominantly used in the food industry in ice cream and desserts, bakery creams, sauces and dressings, glazes and fillings, and some beverages. the global market for seaweed-derived hydrocolloids is estimated to be around $700m, with carrageenans representing 60 per cent of this, and alginates representing about 20 per cent. source: journal of texture studies volume 39 issue 5, pages 582 – 603 "additive effects on the rheological behavior of alginate gels" authors: j. zhang, c.r. hang, c.r. daubert, j.h. mulligan, e.a. foegeding
Source :Food Ingredients Food Science - Additives, Flavours, Starch
Date :
13
October
2008
Category :
Codiments,Desserts,food additi
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\"through our more than 20 years working with ingredients in mexico, i have seen them evolve from basic commodities to higher quality ingredients and now to functional ingredients,\" said francisco xavier morales, general director of fx morales y asociados s.a. de c.v. \"the increase of health problems in our country related to obesity and overweight has made us look for ingredients such as z trim that can help offset this problem, \" he added.
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the u.s. food and drug administration (fda) notified 18 food manufacturers regarding the labeling of food products that violate the federal food, drug, and cosmetic act. the violations cited include unauthorized health claims, unauthorized nutrient content claims, and the unauthorized use of terms such as “healthy,” and others that have strict, regulatory definitions. companies that received warning letters have 15 business days to inform the fda of the steps they will take to correct their labeling or be subject to legal proceedings that would remove misbranded products from the marketplace.
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the trend for 'clean label' foods containing few e-numbers is emanating from the uk market but it is not yet a keen priority for consumers, retailers and manufacturers in every country, says gc hahn. e-numbers are used on food product labels throughout the eu and refer to additives - be they colours, preservatives, antioxidants, acidity regulators, thickeners, stabilisers, emulsifiers, anti caking agents, flavour enhancers or other miscellaneous ingredients.
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food manufacturers are being urged to cash in on the growing consumer demand for specialised food intolerance products and to steer the trend more towards the mass-market. according to euromonitor international, the food industry is struggling to keep up with the rise in food allergies or 'sensitivities' in the uk, and as a result many sufferers have to seek out premium priced food products in specialist outlets.
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