Effect of moisture content

Fig. 3. Effect of moisture content on bending strength of stmctural lumber, MOR = modulus of mpture.

Table 6. The Effect of Moisture Content on the Physical Properties of Wool Fibers at 25°C ...

Figure 22.6 Effect of moisture content, temperature and salt on the resistivity ot soil...

Figure 18.13. Effect of moisture content on the Young s modulus of nylon 66 and nylon 6...

Figure 18.15. Effect of moisture content on tKe volume resistivity of nylon 66...

Fig. 14. DSC evaluation of the effects of moisture content (by weight) on the reactivity of a PF film [160].

Of the numerous reasons for measuring and controlling the moisture content of dehydrated foods, one of the more important is the effect of moisture content on the stability of the food. The storage life of a food generally increases with decreasing amount of water and it is therefore customary to dehydrate the food to some safe moisture level which is determined empirically. 

Fig. 1 The effect of moisture content on the compactibility of anhydrous beta lactose tablets. (From Ref. 8.)...

Accelerated aging and crystal transformation rates have also been traced to high residual moisture content. Ando et al. studied the effect of moisture content on the crystallization of anhydrous theophylline in tablets [9]. Their results also indicate that anhydrous materials convert to hydrates at high levels of relative humidity. In addition, if hygroscopic materials (e.g., polyethylene glycol 6000) are also contained in the formulation, needle-like crystals form at the tablet surface and significantly reduce the release rate of the theophylline. 

Strong, K.P., and Levins, D.M., Effect of Moisture Content on Radon Emanation from Uranium Ore and Tailings, Health Phys. 42 27-32 (1982). 

Jabarin, S. A., Crystallization kinetics of polyethylene terephthalate. III. Effect of moisture content on the crystallization behaviour of PET from the glassy state, J. Appl. Polym. Sci., 34, 103-108 (1987). 

Iyer RM, Augsburger LL, Pope DG, Shah RD. Extrusion/Spheronization— Effect of moisture content and spheronization time on pellet characteristics. Pharm Dev Tech 1996 1(4) 325-331. 

Pitombo, R. N. M., Spring, C., Passos, R. F, Tonato, M., Vitalo, M, Effect of moisture content on the interface activity of freeze-dried S. cerevisiae. Cryobiology 31, p. 383-392,1994. Copyright 1994 by Academic Press, Inc, New York... 

The effects of moisture content in drug substances iancthed dosage form have been widely studied. Static moisture content can be determined by many methods like Karl Fisher titration, loss on drying (LOD), and TGA. Dynamic hygroscopicity of a drug substance has beerLcWaato four... 

Rai, D. Franklin, W. T. "Effect of Moisture Content on Ethylene Glycol Retention by Clay Minerals, Geoderma. 1978,21,75. 

Fig. 3. Effects of moisture content on glucan and xylan conversion of AFEX-treated corn stover at 90°C and 1 1 ammonia loading. All runs were kept at the set temperature for 5 min.

The AFEX reactor consisted of a 300 ml stainless steel pressure vessel (Parr Instrument, Moline, IL) (Fig. 3). The vessel was loaded with prewetted transgenic tobacco leaves with the desired moisture content (a range of moisture content was tested to determine the effect of moisture content on the activity of cellulase in AFEX-treated transgenic plants). The vessel was topped up with stainless steel pellets (approx 1 mm in diameter) to occupy the void space and thus minimize transformation of the ammonia from liquid to gas during loading, and then the lid was bolted shut. Using precalibrated ammonia sample cylinders, a predetermined amount of liquid ammonia was delivered to the vessel. The vessel was heated by a 400-W Parr heating mantle to the desired temperature. 

Two species, chir (Pinus roxburghii Sargent.) size 7.5 x 2.75 x 1.25 cm3and mango (Mangifera indica Linn.) size 7.5 x 1.25 x 1.25 cm3 were studied to establish different reaction variables. Four replicates were taken for each treatment and experiments were carried out with oven-dried samples except in case of those where effect of moisture content was studied. Samples were placed in a reaction chamber and reaction was carried out under reflux conditions at 93+1 C, the boiling point of thioacetic acid. Experimental set-up for vapor phase acetylation is shown in Figure 1. 

Figure 8.5 Schematic diagram of state and phase transitions ofstarch note the effect of moisture content and time on the various states. Tg1 Tg2 and Tg3 represent the glass transition at different moisture content levels. A-L and V-structures denote short- and long-range order of amylose-lipid complexes, whereas d.h. order corresponds to short-range B-type structures.

Figure 8.16 Effect of moisture content on retrogradation kinetics of starch in starch gels or bread 1 wheat starch gels stored at 4°C for 14 days 175 2, 3 and 4 correspond to wheat starch gels, bread and bread with 0.5% monoglyceride, respectively, stored at 25°C for seven days.178...

Jones, D. L., and Edwards, A. C. (1993a). Effect of moisture content and preparation technique on the composition of soil solution obtained by centrifugation. Commun. Soil Sci. Plant Anal. 24(1—2), 171-186. 

Reitemeier, R. F. (1946). Effects of moisture content on the dissolved and exchangeable ions ofsoils of arid regions. Soil Sri. 61, 195—214. 

Figure 1-22 Phase Diagram Showing the Effect of Moisture Content on Melting Temperature (Tm) and Glass Transition Temperature (Tg)...

Figure 1-31 Peroxide Production in Freeze-Dried Salmon Stored at Different Relative Humidities. Source From F. Martinez and T.P. Labuza, Effect of Moisture Content on Rate of Deterioration of Freeze-Dried Salmon, J. Food Sci., Vol. 33, pp. 241-247, 1968.

Martinez, F., and T.P. Labuza. 1968. Effect of moisture content on rate of deterioration of freeze-dried salmon. J. FoodSci. 33 241-247. 

Sebhatu, T., Ahlneck, C., and Alderborn, G. (1997), The effect of moisture content on the compression and bond-formation properties of amorphous lactose particles, Int. J. Pharm., 146,101-114. 

Most mechanical properties reported in the United States are done according to standards described by the American Society of Testing and Materials (ASTM). The standard method for testing small, clear specimens of timber (ASTM D143) calls for the test to be conducted at 65% RH. Control specimens have a moisture content of approximately 9% (Table 3), whereas specimens reacted with acetic anhydride or formaldehyde have a moisture content of only about 4% and specimens reacted with butylene oxide 6%. This means that the standard test is run on specimens of different moisture contents. Because of the great effect of moisture content on mechanical properties (Table 1), it is misleading or even invalid, to compare strength properties of control and modified wood since they were tested at different moisture levels. 

Of particular interest is recent work by Pitombo et al. [ 181. They studied the effect of moisture content on the invertase activity of freeze-dried S. cerevisiae with respect to monolayer moisture content. Samples with water activity above the monolayer moisture content lost at least 60% of their invertase activity samples with water activity at about the monolayer moisture content retained at least 85% of their original invertase activity. 

Many of the large-scale biomass combustion systems for producing heat, hot water, or steam accept biomass fuels containing relatively large amounts of moisture and are operated without much apparent concern for the effects of moisture content of the fuel on the combustion process itself. One of the... 

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