Water Activity, Water Glass Dynamics, and the Control of Microbiological Growth in Foods
Water is probably the single most important factor governing microbial spoilage in foods, and the concept of water activity (aw) has been very valuable because measured values generally correlate well with the potential for growth and metabolic activity. Despite some drawbacks (e.g., solute effect),...
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Taylor and Francis Inc.
1996
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| LEADER | 32931caa a22024497a 4500 | ||
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| 003 | AR-BaUEN | ||
| 005 | 20230518203253.0 | ||
| 008 | 190411s1996 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-0030138758 | |
| 024 | 7 | |2 cas |a Water, 7732-18-5 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 030 | |a CRFND | ||
| 100 | 1 | |a Chirife, J. | |
| 245 | 1 | 0 | |a Water Activity, Water Glass Dynamics, and the Control of Microbiological Growth in Foods |
| 260 | |b Taylor and Francis Inc. |c 1996 | ||
| 270 | 1 | 0 | |m Chirife, J.; Departamento de Industrias, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, (1428) Buenos Aires, Argentina |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a Water is probably the single most important factor governing microbial spoilage in foods, and the concept of water activity (aw) has been very valuable because measured values generally correlate well with the potential for growth and metabolic activity. Despite some drawbacks (e.g., solute effect), the concept of aw has assisted food scientists in their effort to predict the onset of food spoilage as well as to control food-borne disease hazards in food products. In the last decade the concept of aw has been challenged. It has been suggested that reduced-moisture food products (e.g., low and intermediate) may be nonequilibrium systems and that most of them are in the amorphous metastable state, which is very sensitive to changes in moisture content and temperature. It has been proposed that the glass transition temperature Tg (temperature at which the glass-rubber transition occurs), is a parameter that can determine many product properties, the safety of foods among them. The concept of water dynamics, originating in a food polymer science approach, has been suggested instead of aw to better predict the microbial stability of intermediate-moisture foods. The usage of aw to predict microbial safety of foods has been discouraged on the basis that (1) in intermediate-moisture foods the measured water vapor pressure is not an equilibrium one, and because aw is a thermodynamic concept, it refers only to equilibrium; and (2) the microbial response may differ at a particular aw when the latter is obtained with different solutes. This review analyzes these suggestions on the basis of abundant experimental evidence found in the literature. It is concluded that nonequilibrium effects (e.g., inability of water to diffuse in a semimoist food) appear to be in many cases slow within the time frame (food's shelf life) of the experiments and/or so small that they do not affect seriously the application of the aw concept as a predictor of microbial stability in foods. The claims that a food science polymer approach to understanding the behavior of aqueous sugar glasses and concentrated solutions may be used to predict the microbial stability of food systems is not substantiated by experimental evidence. This approach does not offer, at the present time, a better alternative to the concept of aw as a predictor of microbial growth in foods. It is also recognized that aw has several limitations and should be always used carefully, and this must include precautions regarding the possible influences of nonequilibrium situations. This aspect may be summarized by simply saying that anyone who is going to employ the term water activity must be aware of the implications of its definition. |l eng | |
| 593 | |a Departamento de Industrias, Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, (1428) Buenos Aires, Argentina | ||
| 593 | |a Consejo Nac. de Invest. Cie. y Tec., Argentina | ||
| 690 | 1 | 0 | |a MICROBIOLOGICAL GROWTH |
| 690 | 1 | 0 | |a WATER ACTIVITY |
| 690 | 1 | 0 | |a WATER GLASS DYNAMICS |
| 690 | 1 | 0 | |a GLASS |
| 690 | 1 | 0 | |a WATER |
| 690 | 1 | 0 | |a CHEMISTRY |
| 690 | 1 | 0 | |a FOOD CONTAMINATION |
| 690 | 1 | 0 | |a FOOD CONTROL |
| 690 | 1 | 0 | |a FOOD HANDLING |
| 690 | 1 | 0 | |a FOOD PRESERVATION |
| 690 | 1 | 0 | |a METHODOLOGY |
| 690 | 1 | 0 | |a QUALITY CONTROL |
| 690 | 1 | 0 | |a REVIEW |
| 690 | 1 | 0 | |a STANDARD |
| 690 | 1 | 0 | |a THERMODYNAMICS |
| 690 | 1 | 0 | |a FOOD CONTAMINATION |
| 690 | 1 | 0 | |a FOOD HANDLING |
| 690 | 1 | 0 | |a FOOD MICROBIOLOGY |
| 690 | 1 | 0 | |a FOOD PRESERVATION |
| 690 | 1 | 0 | |a GLASS |
| 690 | 1 | 0 | |a QUALITY CONTROL |
| 690 | 1 | 0 | |a THERMODYNAMICS |
| 690 | 1 | 0 | |a WATER |
| 651 | 4 | |a ARGENTINA | |
| 651 | 4 | |a ARGENTINA | |
| 700 | 1 | |a Del Pilar Buera, M. | |
| 773 | 0 | |d Taylor and Francis Inc., 1996 |g v. 36 |h pp. 465-513 |k n. 5 |p Crit. Rev. Food Sci. Nutr. |x 10408398 |w (AR-BaUEN)CENRE-293 |t Critical Reviews in Food Science and Nutrition | |
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| 856 | 4 | 0 | |u https://doi.org/10.1080/10408399609527736 |y DOI |
| 856 | 4 | 0 | |u https://hdl.handle.net/20.500.12110/paper_10408398_v36_n5_p465_Chirife |y Handle |
| 856 | 4 | 0 | |u https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10408398_v36_n5_p465_Chirife |y Registro en la Biblioteca Digital |
| 961 | |a paper_10408398_v36_n5_p465_Chirife |b paper |c PE | ||
| 962 | |a info:eu-repo/semantics/article |a info:ar-repo/semantics/artículo |b info:eu-repo/semantics/publishedVersion | ||
| 999 | |c 64371 | ||