Process performance and quality attributes of temperature and step-down relative humidity controlled hot air drying of Panax notoginseng roots

Jiang, Dalong; Li, Congcong; Zielinska, Sara; Liu, Yanhong; Gao, Zhen-Jiang; Wang, Rongyan; Zhou, Zheng

doi:10.25165/j.ijabe.20211406.6198

Cited by 3 publications

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“…The moisture ratio (MR) of chrysanthemum during drying was calculated using the following equation [12] :…”

Section: Drying Characteristics Analysis 241 Moisture Ratiomentioning

confidence: 99%

Effects of different pulsed vacuum drying strategies on drying kinetics, phenolic composition, and antioxidant capacity of chrysanthemum (Imperial chrysanthemum)

Zhang

et al. 2022

International Journal of Agricultural and Biological Engineering

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This work aimed to discuss effects of pulsed vacuum drying (PVD) at different temperatures (45°C, 50°C, 55°C and 60°C), vacuum durations (5 min, 10 min and 15 min) and multi-stage heating on drying kinetics, colour attributes, phenolic compounds and antioxidant capacity of chrysanthemum (Imperial chrysanthemum). Results indicated that successive temperature increase reduced the drying time and enhanced the drying rate and moisture diffusivity. Lower temperature (45°C) and the multi-stage (35°C -55°C -60°C ) drying presented the superiority in the protection of color, preservation of phytochemical composition (chlorogenic acid, luteolin, total phenolic and total flavonoid content) and improvement of antioxidant capacity (DPPH and FRAP) of chrysanthemum, which was attributed to the low-oxygen drying environment and reduction of thermal degradation losses. Based on the results of drying efficiency and drying quality, the multi-stage heating (35°C -55°C -60°C ) has the excellent potential to produce high-quality dried chrysanthemum on a commercial scale.

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“…The moisture ratio (MR) of chrysanthemum during drying was calculated using the following equation [12] :…”

Section: Drying Characteristics Analysis 241 Moisture Ratiomentioning

confidence: 99%

Effects of different pulsed vacuum drying strategies on drying kinetics, phenolic composition, and antioxidant capacity of chrysanthemum (Imperial chrysanthemum)

Zhang

et al. 2022

International Journal of Agricultural and Biological Engineering

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“…Five saponins, i.e., ginsenoside R b1 , ginsenoside R g1 , notoginsenoside R 1 , ginsenoside R d and ginsenoside R e , are most often used in pharmacy and medicine [7] . Importantly, ginsenoside R 1 is an important component of Xueshuantong capsule [8] . The sum of R 1 , R g1 , R e , R d, and R b1 contents is equal to the PNS value.…”

Section: Introduction mentioning

confidence: 99%

Effects of combined infrared and hot-air drying on ginsenosides and drying characteristics of Panax notoginseng (Araliaceae) roots

Jiang¹,

Liu²,

Lin³

et al. 2022

International Journal of Agricultural and Biological Engineering

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Exploring new drying technology can help to deal with the challenge of better preservation of rhizome medicinal materials in the traditional Chinese medicine industry. In current work, combined infrared and hot-air drying (IR-HAD) was employed to Panax notoginseng roots and its effect on drying kinetics, energy efficiency and quality, i.e., rehydration ratio (RR), color parameters (L*, a*, b*), total color difference (∆E), Panax notoginseng saponins (PNS) content, and ginsenosides content (R 1 , R g1 , R e , R d , R b1 ) were evaluated. Hot air drying (HAD) was used as the control. Results showed that the increase in drying temperature significantly shortened drying time and reduced energy consumption. The shortest drying time of 43.0 h and lowest specific energy consumption of 15.9 kW• h/(kg-water) were obtained by IR-HAD at 55°C. The decrease of radiation distance and the increase of radiation power led to the shortening of drying time. However, high drying temperature resulted in large ΔE values, large collapse structure, and RR of samples. The drying time of Panax notoginseng roots dried by IR-HAD at a drying temperature of 50°C was shorter (15.5%) than HAD dried at the same drying temperature. The contents of R 1 , R g1 , R e , R b1 , and PNS were higher when the samples were dried by IR-HAD than those dried by HAD at the same temperature of 50°C. Moreover, the IR-HAD dried samples shortened 15.5% drying time and saved 22.1% energy consumption compared with HAD. Therefore, the optimal process condition was Panax notoginseng roots under IR-HAD at drying temperature of 50°C, radiation distance of 12 cm and radiation power of 1350 W, which can shorten drying time, maintain high ginsenosides contents and satisfactory apparent qualities.

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Study on Drying Control Strategy of White Radish Slice Based on Monitoring Medium Relative Humidity

Jiang

Zhou

2022

Foods

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Enhancing the drying rate and dried products quality, as well as energy efficiency, is very tempting for the drying industry. Recently, a lot of investigations have illustrated that the drying temperature, air velocity, and sample thickness have significant influences on the drying process. However, few investigations took into account the relative humidity (RH) as an important hot-air-drying parameter in the drying process. Therefore, in the current work, white radish slabs were used to explore the drying characteristics and quality under the drying condition of a constant RH, decreasing the RH step by step and decreasing RH automatically, together with a constant air velocity of 1 m·s−1 and a drying temperature of 60 °C. Compared to continuous dehumidification, the step-down RH process was conducive to the material center temperature rise in the early stage of drying. When the material central temperature was increased and then the RH was reduced, the drying rate was increased and the overall drying time was shortened. The automatic-down RH control drying process includes three dehumidification processes. The respective RH control values were 40%, 30%, and 20% and the respective durations were 180 min, 90 min, and 60 min. The comprehensive quality evaluation showed that the comprehensive score of the automatic-down RH control process at 60 °C was the highest, which was 0.85. The L* and b* values of the automatic-down RH control were 26.0 and 1.67, respectively, which were better than those of the step-down RH, constant 20% RH, and constant 40% RH. The maximum rehydration ratio was 3.96 under the automatic-down RH control condition, and the quality was good. The lowest energy consumption under the condition of the automatic-down RH control was 0.90 kW·h·kg−1. The present work contributes to a better understanding of the effect of the RH on the drying characteristics and quality of white radish slices, which is useful for enhancing the drying rate and dried products’ quality as well as energy efficiency.

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Process performance and quality attributes of temperature and step-down relative humidity controlled hot air drying of Panax notoginseng roots

Cited by 3 publications

References 0 publications

Effects of different pulsed vacuum drying strategies on drying kinetics, phenolic composition, and antioxidant capacity of chrysanthemum (Imperial chrysanthemum)

Effects of different pulsed vacuum drying strategies on drying kinetics, phenolic composition, and antioxidant capacity of chrysanthemum (Imperial chrysanthemum)

Effects of combined infrared and hot-air drying on ginsenosides and drying characteristics of Panax notoginseng (Araliaceae) roots

Study on Drying Control Strategy of White Radish Slice Based on Monitoring Medium Relative Humidity

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