Static and dynamic methods to determine adsorption isotherms of hemp seed (Cannabis sativa L.) with different percentages of dockage

Abstract

Adsorption and desorption isotherms of hemp seeds with 0%, 5%, 10%, 15%, and 20% of dockage were determined using the salt solution static (SSS) method. The wet hemp seeds with 0% dockage were also dried at 30℃ with 50% RH, 35℃ with 30% and 50% RH, and 40℃ with 30% and 50% RH inside a thin‐layer dryer (thin‐layer dynamic method). The hemp seeds with different percentages of dockage showed hysteresis, and this hysteresis became more obvious with the decrease of temperature. At the same condition, the equilibrium moisture content of hemp seeds with 0% dockage was approximately 0.5 percent points lower than that of the hemp seeds with dockage. The best equation to fit the equilibrium moisture content data under constant temperature and RH was the modified GAB equation for both adsorption and desorption isotherms. The constant rate period of drying was observed for <0.75 hr when drying air RH was 30% or when drying air temperature was 40℃. The Henderson and Pabis model was the best model to fit the thin‐layer drying data. The equilibrium moisture contents measured by the SSS method were lower than those measured by the thin‐layer dynamic method when temperature was ≤35℃.

Sorption isotherms of tobacco (Nicotiana tabacumL.) seeds

“…Regardless of temperature, the absolute hysteresis values steadily exceeded 0.7% at water activities above 0.5. These results were in compliance with previous observations for pea seeds [32], hemp seeds [30], pistachio nuts [33], and more. Therefore, our results suggested that those sorption capacity variations should be taken into account in tobacco seed storage, as it encompasses a long-term influence of fluctuating air humidity and temperature, characteristic for the unprotected storage environments in many climatic zones worldwide.…”

“…E3S Web of Conferences 207, 010 (2020) PEPM'2020 https://doi.org/10.1051/e3sconf/202020701018 As the figures suggested, all isotherms had the typical S-shaped profile, therefore they belonged to Type II isotherms, according to the classification of Brunauer [22], indicating multilayer moisture adsorption within the material [25,26]. The increase of equilibrium moisture with water activity is typical for agricultural materials, and seeds in particular, as found for example in lime seeds [25], cotton seeds [27], prickly pear seeds [28], flax seeds [29], hemp seeds [30], and others. At lower water activities, aw<0.53, the increase in equilibrium moisture was slower, i.e.…”

“…https://doi.org/10.1051/e3sconf/202020701018 seed isotherm analyses [28,30], was less adequate for experimental data approximation in this study. Some variation was observed from the results by [20,21], who recommended GAB and Oswin models as the most suitable for the seeds of other Bulgarian tobacco varieties.…”

Anticancer property of Hemp Bioactive Peptides in Hep3B liver cancer cells through Akt/GSK3β/β‐catenin signaling pathway

“…Cannabis sativa L ., commonly known as hemp, is an annual herbaceous plant belonging to the Cannabaceae family, which is cultivated in China and Canada (ElSohly et al., 2017; Jian et al., 2018). Hemp has been an important source of raw materials in manufacturing and industry, including use of the hemp seeds, fiber, meal, and oil (Grof, 2018; Potter, 2014).…”

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Cannabis sativa L., commonly known as hemp, is an annual herbaceous plant belonging to the Cannabaceae family, which is cultivated in China and Canada (ElSohly et al, 2017;Jian et al, 2018).Hemp has been an important source of raw materials in manufacturing and industry, including use of the hemp seeds, fiber, meal, and oil (Grof, 2018;Potter, 2014). Industrial hemp seeds are a novel variety of cannabis which contain low levels of δ-9-tetrahydrocannabinol (THC), with a concentration of less than 0.3%; industrial hemp seeds are now legally grown across dozens of countries worldwide (Mechoulam & Gaoni, 1967) and have been used in the development of numerous products, including clothing, chemicals, bioenergy, and food health, among others (Zengin et al, 2018).

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