Preservation procedures

Gould G.W. (ed.) (19S9) Mechanisms of Action of Food Preservation Procedures. Barking Elsevier Science Publishers. (2)... 

McCleskey R. B. and Nordstrom D. K. (2003) Arsenic (III/V) preservation procedures for water samples new data and an evaluation of the literature. Appl. Geochem. (in review). 

Gould, G. W. (1989) Mechanisms of Action of Pood Preservation Procedures. Elsevier Science Publishers, Barking. 

Gould, G.W. and Jones, M.V. 1989. Combination and synergistic effects. In Mechanisms of Action of Food Preservation Procedures, G.W. Gould (Ed.), London Elsevier Science. 

The role of water in relation to microbial growth is treated by G. W. Gould. Drying, raised osmotic pressure and low water activity. In G. W. Gould, ed. Mechanisms of action of food preservation procedures. Elsevier, London, 1989, pp. 97-118. 

There is a general consensus that analysis of fresh material yields results which come closest to the natural distribution pattern in plants. Since this approach is not feasible in most cases suitable preservation procedures must be employed. Advantages and disadvantages of such procedures with respect to polyphenol analysis have been reviewed by several authors [47-49]. The procedure keeping the chemical composition as close as possible to the natural state is lyophilization. A study of the extractability of proanthocyanidins in the bark of several pines (Pinus sp.) showed no difference between freshly collected samples and freeze-dried samples. On the other hand drying at room temperature resulted in an increase in extractability in one sample [50]. Increased extractability after drying at room temperature compared to fresh material has also been... 

One of the most critical steps in the analysis of procyanidins is their extraction. Preservation procedures and storage conditions of the crude samples as well as procedures and conditions during homogenization and extraction have a tremendous impact on the amount and composition of the extractable procyanidins. In view of a good reproducibility a complete standardization of all procedures and experimental conditions from the time of sample collection to the storage of the final extract must be emphasized. It is recommended to analyze fresh samples. If this is not possible, lyophilization is the drying procedure of choice. Samples should not be stored at all. If this can not be avoided care must be taken to exclude... 

Preservation of IM meat is complex in nature. The identified stabilization operations/treatments in processing, water activity, and storage temperature of IM meat are never greater than those for other preserved meats (Leistner, 1987). The specific preservation procedure or step for each empirical product cannot be taken for granted, but must be determined by experimentation. The possible involved consequence and/or synergistic stabilization factors developed in the preservation procedure should be subjected to more scientific scrutiny. 

Samples were taken from all the pieces in the test batch before starting and after finishing the preservation procedure. Some pieces were also sampled after 4.5 months of treatment to test the water and PEG contents of the wood. As a measure of the contents of water and PEG, the ratios between the analytically determined weights of these substances and the weight of the wood fibers in the test samples have been calculated. 

The improvements in techniques for the trace level determination of difficult analytes, such as mercury in cmde oil, serve to focus future efforts on proper sampling and preservation procedures. The inherent simplicity of a total combustion procedure for hydrocarbon samples removes many of the analytical variables that would otherwise confuse the issue. 

Tehrani FA, Ahmadiani A, Niknejad H. The effects of preservation procedures on antibacterial property of amniotic membrane. Cryobiology 2013 67 293-8. 

Improvements in the sample pretreatment procedures. Sample cleanup, preconcentration, and preservation procedures of natural species are urgently needed. There is no guarantee that transformation of elemental speciation along the whole analytical procedure does not take place. In this sense, the use of isotopically labeled compounds using an adequate separation technique coupled to ICP-MS is being established. It seems clear that the use of isotopically enriched species, synthesized for the purpose, will became an important tool for validation of speciation results. 

As a rule of thumb, during sample transportation, the preferred preservation procedure is to keep the sample cool at 4°C. If analysis is to be delayed in the laboratory, sample refrigeration is required. The sample preservation methods described above are only a small number of examples to illustrate sample preservation methods with respect to the analyte of interest, for specific details of individual sampling methods consult APHA (1998). 

Fig. 25.7 Two tendon grafts having different directions are placed intra-articularly (a). In the remnant tissue-preserving procedure, the same two tendon grafts were placed, penetrating the remnant tissue (b)...

Gould, G.W (Ed.) Mechanisms of action of food preservation procedures. Elsevier AppUed Science London (1989)... 

GriflBn, W.C., Lynch, M.J. Surface active agents. In Handbook of food additives, 2nd edn. (Ed. Euria, T.E.), p. 397, CRC Press Cleveland, Ohio. 1972 Haberstroh, H.-J., Hustede, H. Weinsaure. UUmanns Encyklopadie der technischen Chemie, 4. edn., vol. 24, p. 431. Veriag Chemie Weinheim. 1983 Herbert, R.A. Microbial growth at low temperatures. In Gould, G.W. (Ed.) Mechanism of action of food preservation procedures, p. 71. Elsevier AppUed Science London (1989)... 

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