Soft drink investigation

A description is given of a comparative study of the glycolysis of PETP waste soft drinks bottles by various mixtures of EG and DEG with subsequent polyesterification of the glycolysed products by maleic anhydride in order to obtain unsaturated polyesters suitable for the production of varnishes. The processing characteristics such as viscosity, exotherm temperatures of curing, compatibility of resins with monomers was investigated with respect to the type and amount of reactive monomers. The mechanical properties of varnishes produced were analysed. 13 refs. 

Parry, J., Shaw, L., Arnaud, M. J., and Smith, A. J. (2001). Investigation of mineral waters and soft drinks in relation to dental erosion. /. Oral Rehab. 28, 766-772. 

The use of food colours is carefully controlled under various legislations (Table 5.5). There is at present no universal listing of colours for soft drinks and it is necessary to investigate the permitted list to ensure compliance for goods to be manufactured in, or exported to, a particular country. 

Table 11.6 Scheme for soft drink forensic microbiological investigations...

In identifying dominant important organisms for the soft drinks industry, there are many pitfalls for the inexperienced yeast microbiologist. Recently, there have been three major investigations of beverage and food problems that have cost the industry millions of pounds in lost product and raw materials. These losses were due to inexperience in the identification of micro-organisms and making appropriate assessment and recommendations. Other limitations of... 

Davenport, R.R. (1997) Forensic microbiology II. Case book investigations. Soft Drinks Management International April, 26-30. 

Aqueous samples were extracted for phenol and 4-chlorophenol using pure carbon dioxide in a specially designed phase separator apparatus (111). The extraction efficiency for these phenols was reported to be over 85%, with a RSD of 8% for eight samples. Additional liquid sample extractions have been investigated for the extraction of phenol from a 6M sulfuric acid solution as well as the extraction of the components of commercial soft drinks and orange juice (112-113). In all cases, specifically designed extraction vessels were utilized. 

Quite a few papers in the medical literature have actually made that point. One of the most recent came from Danish investigators in 2006. Wine drinkers in the Copenhagen study have healthier diets than do people who prefer beer. They buy and eat more fruits, vegetables, olives, low-fat cheese, and cooking oil. Beer drinkers in Denmark, on the other hand, consume fast food, soft drinks, sugar, and saturated and trans fats. To add insult to injury, those wine drinkers were better educated, healthier, and leaner. California investigators have come to the same conclusion about wine drinkers in that state. And, it appears, the same applies to French wine drinkers. 

A new in-channel configuration for the amperometric detection of synthetic dyes in food has also been investigated [34], The well-known advantages of in-channel configuration such as allowing better peak resolution and higher sensitivity due to the prevention of the dispersion of the analyte band were suceessfully demonstrated. Fast separation of the target dyes in the food samples (soft drinks, syrup, and candy) was performed in less than 200 s. 

Normutritive (low-calorie) sweeteners are widely used in foods and soft drinks. However, investigations on the toxicity of these compoimds (especially saccharin, aspartame, cyclamate, and acesulfame-K) have raised questions about their safety. Their daily use is regulated through legislation, and as a result, their concentration in foods and beverages should be determined to prevent excessive intake. 

Benzoic acid and sorbic acid are widely used as acceptable food preservatives. Salicylic acid is not a food preservative and is not allowed to be added to food it is, however, illegally used in foods and beverage due to its superior effectiveness in controlling mold and inhibiting yeast growth. A SIC method for the determination of benzoic acid, sorbic acid, and salicylic acid has been investigated (Jangbai et al., 2012). Separation was performed on a monolithic C-18, (5 x 4.6 mm) column with 1% acetonitrile ammonium acetate buffer pH 4.5 as a mobile phase at a flow rate of 1.20 mL/min at ambient temperature and with UV detection at 235 nm. Separation of the three compounds was achieved within less than 3 min. The developed procedure was demonstrated to be an effective alternative fast and simple method for the analysis of food, fruit juice, syrup, and soft drink samples. 

C. Chen. Study of Glycolysis of Poly(ethylene terephthalate) Recycled from Postconsumer Soft-Drink Bottles. III. Further Investigation. J. Appl. Polym. ScL, 87, 2004-2010 (2003). 

The fluoride content of the heart appeared to increase in old mice fed the low Ca diet and fluoride feeding caused an increase in the level of the hearts of old mice fed high or low Ca diet. When male or female mice were supplied drinking water containing 10 mg/L fluoride, the levels in the soft tissues including heart and kidney were, however, undetectable at 24 months of age (25). This could be due to limited sensitivity of the method used by these investigators. 

---