Future potential compounds formed

Potential hazards to humans may be connected with the use of chlorine-based washing systems. Apart from the direct occupational hazard, there are increasing concerns about the formation of potentially harmful by-products. Chlorine may react with organic compounds on the products and form hazardous organochlorines that are considered to be potential carcinogens (Beuchat, 1998 Betts and Everis, 2005). Betts and Everis (2005) suggest that a ban on the use of hypochlorite systems is likely in the future. 

As seen from this review, CO2 diemistry is likely to have its second rebirth when it is extended to systems with transition metal participation. Even the first results disclose numerous possibilities for using CO2 in different chemical processes in the future. The industrial chemist is especially interested in producing usable compounds which are formed from the cheap chemical CO2. Further research should be done on the hydrocarboxylatton reactions of alkenes whereby saturated or unsalurated carboxylic acids are obtained. Aromatics or alkanes with activated hydrogen should also be possible reaction partners of carb(Hi dioxide. Future work will extend our knowledge of the scope of transition metal-C02 chemistry and of the potential uiUity of carbon dioxide as a feedstock for the production of organic chemicals. 

The distribution of metabolites obtained after incubation of pineapple slices with keto acids and keto esters, potential precursors of the corresponding hydroxy compounds, is summarized in Table II. The metabolization steps comprise esterification, reduction to hydroxy compounds, formation of acetoxy esters, and cyclization to the corresponding lactones. Metabolization rate and distribution of formed products strongly depend on the structures of the precursors. The detection of these metabolites proves the enzymatic capability of pineapple tissue to catalyze these conversions, an aspect which might be interesting for future use of pineapple tissue cultures in the production of chiral compounds. 

Effectiveness questioned Possible future regulations High oxidation capacity Does not form dangerous chloramine compounds More effective than chlorine due to high reduction potential Higher effectiveness than ozone in reducing viable aerobes on whole lettuce... 

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