Additives intentional

Food additives can be divided into two major groups, intentional additives and incidental additives. Intentional additives are chemical substances that are added to food for specific purposes. Although we have little control over unintentional or incidental additives, intentional additives are regulated... 

See also Food additives Additives, intentional, major classes... 

Organoalkoxysilanes are utilized in different application sectors, because under application conditions no acidic cleavage products are formed as is the case with organo-halosilanes. In addition intentional hydrolysis, e.g. in silicone chemistry, is generally easier to control than in the case of organohalosilanes. 

Over the years the ADIs established by JECFA and JMPR have become more and more esteemed by national food regulatory agencies, the food industry and pesticide manufacturers. It would, however, be unfortunate if those concerned with additives (intentional and unintentional) and pesticide residues in food failed to appreciate the basis of the ADI figures and the uncertainties that beset their accuracy and reliability. It is not the intention of this paper to deal specifically with these aspects and the reader is again referred to two recent publications [8, 9]. 

General Characteristics of the Additives. Intentionally added to the raw polymer, additives can be classified according to their action as processing aids or functional auxiliaries. 

Tensoactive agent Chemical agents or additives intentionally used to change the water surface tension mainly used in cake making. 

The acronym LASER (Light Amplification via tire Stimulated Emission of Radiation) defines the process of amplification. For all intents and purjDoses tliis metliod was elegantly outlined by Einstein in 1917 [H] wherein he derived a treatment of the dynamic equilibrium of a material in a electromagnetic field absorbing and emitting photons. Key here is tire insight tliat, in addition to absorjDtion and spontaneous emission processes, in an excited system one can stimulate tire emission of a photon by interaction witli tire electromagnetic field. It is tliis stimulated emission process which lays tire conceptual foundation of tire laser. 

By intentionally adding inorganic salts to the solution used for FD, cationated molecular ions can be produced in abundance. Equation 5.3 illustrates how addition of NaCl can give rise to [M + Na] ions. 

For nickel, cobalt, and hon-base alloys the amount of solute, particularly tungsten or molybdenum, intentionally added for strengthening by lattice or modulus misfit is generally limited by the instability of the alloy to unwanted CJ-phase formation. However, the Group 5(VB) bcc metals rely on additions of the Group 6(VIB) metals Mo and W for sohd-solution strengthening. 

The amount of plasticizer added to the polymer in question varies, depending on the magnitude of the effect required. For example, a small addition of plasticizer may be made simply to improve the workabiUty of the polymer melt. This contrasts with larger additions made with the specific intention of completely transforming the properties of the product. For example, PVC without a plasticizer, ie, unplasticized PVC (PVC-U), is used in appHcations such as pipes and window profiles with plasticizer added, articles such as PVC food film, PVC cable insulation, and sheathing and PVC floorings are formed. 

Production figures are not pubHshed by these producers, so precise production amounts are not available however, it is roughly estimated that global production in 1989—1990 was 500,000—600,000 t/yr. Approximately 90% of this aHyl chloride production is used captively to synthesize epichlorohydrin. The remainder is sold on the merchant market with bulk Hst U.S. prices in 1989—1990 of 1.63/kg. Some of the producers Hsted above and several additional companies have announced their intentions to expand or build aHyl chloride capacity. 

In addition to films that originate at least in part in the corroding metal, there are others that originate in the corrosive solution. These include various salts, such as carbonates and sulfates, which may be precipitated from heated solutions, and insoluble compounds, such as beer stone, which form on metal surfaces in contac t with certain specific products. In addition, there are films of oil and grease that may protect a material from direct contact with corrosive substances. Such oil films may be apphed intentionally or may occur naturally, as in the case of metals submerged in sewage or equipment used for the processing of oily substances. 

Repeatedly in this book, the important functions of dopants , intentional additives made in small amounts to materials, have been highlighted the use of minor additives to the tungsten used to make lamp filaments is one major example. The role of impurities, both intentional and unintentional, in matters such as phase transformations, mechanical properties and diffusion, was critically reviewed in one of the early seminar volumes published by the American Society for Metals (Marzke 1955). But extreme purity was not considered that came a little later. 

All the design and operating intentions are achieved together with some additional activity... 

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