The effect of water activity (aw ) or the relative humidity (RH) on the tensile rupture properties of dried laver (DL) associated with structures formed with phycocolloids was investigated. The morphological characteristics of tensile ruptured DL samples at various relative humidities were evaluated by multifractal analysis. The RH of the microclimate was controlled from 10% to 90% at 25 °C using supersaturated salt solutions. The sorption isotherm of DL was experimentally obtained and quantitatively analyzed using mathematical models. The monolayer moisture contents from the Guggenheim-Anderson-de Boer (GAB) model was 5.92% (w.b.). An increase in the RH resulted in increasing ring tensile stress and maintaining constant ring tensile strain up to 58% to 75% RH, whereas the ring tensile stress and the ring tensile strain rapidly decreased and increased, respectively, when the RH was higher than 75%. The general fractal dimensions and the multifractal spectra f(α) manifested that the patterns of the lowest and the highest moisture content of dried laver showed high irregularity. The different multifractal parameters obtained from the DL at various RHs well-represented the transient moment of the structures from the monolayer moisture to texture changes associated with RH. Overall, the ring tensile test and the multifractal analysis were useful tools to analyze the change of crispness of DL from its structural characteristics. In addition, the results of this study revealed that the integration and disintegration properties of DL occurred through the networks of phycocolloids at various moisture contents. PRACTICAL APPLICATION Texture properties are the most important quality attributes for commercial dried laver (DL) products. The relative humidity influences the texture properties of DL during production, storage, shipping, and consuming. This study well characterized the effect of the relative humidity on the texture properties of DL using the tensile tests under microclimate conditions. This information is very practical and can be immediately applied to control the relative humidity of the packaging and the storage room for DL.

中文翻译：

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受相对湿度影响的紫菜（紫菜）环拉伸断裂模式的多重分形方法

研究了水分活度 (aw ) 或相对湿度 (RH) 对与藻胶体形成的结构相关的干紫菜 (DL) 拉伸断裂性能的影响。通过多重分形分析评估了在各种相对湿度下拉伸断裂 DL 样品的形态特征。使用过饱和盐溶液在 25°C 时将小气候的 RH 控制在 10% 至 90%。DL的吸附等温线通过实验获得并使用数学模型进行定量分析。Guggenheim-Anderson-de Boer (GAB) 模型的单层水分含量为 5.92% (wb)。RH 的增加导致环拉应力增加并保持恒定的环拉应变高达 58% 至 75% RH，而当 RH 高于 75% 时，环拉应力和环拉应变分别迅速减小和增加。一般分形维数和多重分形谱f(α)表明，干紫菜含水率最低和最高的图案呈现出高度的不规则性。从不同 RH 下的 DL 获得的不同多重分形参数很好地代表了结构从单层水分到与 RH 相关的纹理变化的瞬态。总体而言，环拉伸试验和多重分形分析是从结构特征分析 DL 脆度变化的有用工具。此外，这项研究的结果表明，DL 的整合和崩解特性是通过不同水分含量的藻胶体网络发生的。实际应用 质地特性是商业干紫菜 (DL) 产品最重要的质量属性。相对湿度会影响 DL 在生产、储存、运输和消费过程中的质地特性。本研究使用小气候条件下的拉伸试验很好地描述了相对湿度对 DL 纹理特性的影响。该信息非常实用，可以立即用于控制 DL 的包装和储藏室的相对湿度。本研究使用小气候条件下的拉伸试验很好地描述了相对湿度对 DL 纹理特性的影响。该信息非常实用，可以立即用于控制 DL 的包装和储藏室的相对湿度。本研究使用小气候条件下的拉伸试验很好地描述了相对湿度对 DL 纹理特性的影响。该信息非常实用，可以立即用于控制 DL 的包装和储藏室的相对湿度。