Solubility of different salts used in the control of the water activity of foods

IF 1.2 4区农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY

Ciencia E Agrotecnologia Pub Date : 2023-07-10 DOI:10.1590/1413-7054202347018722

M. J. N. Martins, M. A. R. Sanches, T. C. Polachini, E. B. Oliveira, J. Coimbra, J. Telis‐Romero

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Abstract

ABSTRACT Saturated salt solutions produce environments with specific relative humidities used in several applications, such as determining water sorption isotherms of foods. However, the preparation of saturated solutions requires knowledge of solubility data. Thus, the objective of this work was to determine the solubility of 14 salts: lithium bromide (LiBr), lithium chloride (LiCl), lithium iodide (LiI), magnesium chloride (MgCl2), sodium iodide (NaI), potassium carbonate (K2CO3), magnesium nitrate (Mg(NO3)2), sodium bromide (NaBr), potassium iodide (KI), sodium chloride (NaCl), ammonium sulfate ((NH4)2SO4), potassium chloride (KCl), potassium nitrate (KNO3), and potassium sulfate (K2SO4) in the temperature range of 275.15 to 363.15 K at 101.3 kPa. The apparatus for the solubility determination consists of a jacketed glass cell and a magnetic stirrer. Furthermore, polynomial and exponential empirical models were fitted to the observed data to determine salt solubilities. Salt solubilities ranged from 7.39 to 80.41 g of salt·(100 g of solution)-1. Sodium iodide (NaI) presented the highest (p<0.05) solubility, up to 343.15 K, and lithium iodide (LiI) up to 363.15 K. The specific equilibrium moistures afforded by saturated saline solutions were associated with water activity data. A general mathematical model to determine the solubility of different salts was not obtained because the dissolution behaviors of each salt are distinct. However, the availability of solubility data of saline solutions covering a wide range of temperatures is helpful since the salts have different behavior.

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不同盐的溶解度用于控制食品的水分活性

饱和盐溶液产生的环境具有特定的相对湿度，在许多应用中使用，例如确定食品的吸水等温线。然而，饱和溶液的制备需要溶解度数据的知识。因此，本工作的目的是测定14种盐:溴化锂(LiBr)、氯化锂(LiCl)、碘化锂(LiI)、氯化镁(MgCl2)、碘化钠(NaI)、碳酸钾(K2CO3)、硝酸镁(Mg(NO3)2)、溴化钠(NaBr)、碘化钾(KI)、氯化钠(NaCl)、硫酸铵((NH4)2SO4)、氯化钾(KCl)、硝酸钾(KNO3)和硫酸钾(K2SO4)在275.15 ~ 363.15 K、101.3 kPa温度范围内的溶解度。测定溶解度的装置由夹套玻璃槽和磁性搅拌器组成。此外，对观测数据进行了多项式和指数经验模型拟合，以确定盐的溶解度。盐的溶解度为7.39 ~ 80.41 g·(100 g溶液)-1。碘化钠(NaI)溶解度最高(p<0.05)，可达343.15 K，碘化锂(LiI)可达363.15 K。饱和盐溶液提供的比平衡水分与水活度数据有关。由于每种盐的溶解行为不同，没有一个通用的数学模型来确定不同盐的溶解度。然而，盐溶液的溶解度数据的可用性覆盖广泛的温度范围是有帮助的，因为盐有不同的行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ciencia E Agrotecnologia 农林科学-农业综合

CiteScore

2.30

自引率

9.10%

发文量

审稿时长

6-12 weeks

期刊介绍： A Ciência e Agrotecnologia, editada a cada 2 meses pela Editora da Universidade Federal de Lavras (UFLA), publica artigos científicos de interesse agropecuário elaborados por membros da comunidade científica nacional e internacional. A revista é distribuída em âmbito nacional e internacional para bibliotecas de Faculdades, Universidades e Instituições de Pesquisa.