Impacts of different drying strategies on drying characteristics, the retention of bio-active ingredient and colour changes of dried Roselle

doi:10.1016/j.cjche.2017.05.011

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (2): 303-316.DOI: 10.1016/j.cjche.2017.05.011

• Separation Science and Engineering • 上一篇下一篇

Impacts of different drying strategies on drying characteristics, the retention of bio-active ingredient and colour changes of dried Roselle

Thing Chai Tham¹, Mei Xiang Ng¹, Shu Hui Gan¹, Lee Suan Chua², Ramlan Aziz², Luqman Chuah Abdullah³, Sze Pheng Ong¹, Nyuk Ling Chin⁴, Chung Lim Law¹

1 Department of Chemical Engineering, The University of Nottingham, Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor D. E., Malaysia;
2 Institute of Bioproduct Development, Universiti Teknologi Malaysia, UTM, Johor Bahru, 81310 Skudai, Malaysia;
3 Department of Chemical and Environmental Engineering, Universiti Putra Malaysia, UPM, 43400 Serdang, Selangor, Malaysia;
4 Department of Process and Food Engineering, Universiti Putra Malaysia, UPM, 43400 Serdang, Selangor, Malaysia

收稿日期:2017-02-07 修回日期:2017-05-27 出版日期:2018-02-28 发布日期:2018-03-16
通讯作者: Chung Lim Law
基金资助:
Supported by the Ministry of Agriculture and Agro-Based Industry (MOA), Malaysia (NER 30001).

Impacts of different drying strategies on drying characteristics, the retention of bio-active ingredient and colour changes of dried Roselle

Thing Chai Tham¹, Mei Xiang Ng¹, Shu Hui Gan¹, Lee Suan Chua², Ramlan Aziz², Luqman Chuah Abdullah³, Sze Pheng Ong¹, Nyuk Ling Chin⁴, Chung Lim Law¹

1 Department of Chemical Engineering, The University of Nottingham, Malaysia Campus, Jalan Broga, 43500 Semenyih, Selangor D. E., Malaysia;
2 Institute of Bioproduct Development, Universiti Teknologi Malaysia, UTM, Johor Bahru, 81310 Skudai, Malaysia;
3 Department of Chemical and Environmental Engineering, Universiti Putra Malaysia, UPM, 43400 Serdang, Selangor, Malaysia;
4 Department of Process and Food Engineering, Universiti Putra Malaysia, UPM, 43400 Serdang, Selangor, Malaysia

Received:2017-02-07 Revised:2017-05-27 Online:2018-02-28 Published:2018-03-16
Contact: Chung Lim Law
Supported by:
Supported by the Ministry of Agriculture and Agro-Based Industry (MOA), Malaysia (NER 30001).

摘要/Abstract

摘要： The drying kinetics of Roselle (Hibiscus sabdariffa L.) of variety Terengganu (UMKL-1) and the quality attribution of Roselle were studied. The experiments were conducted using four different drying methods, including solar greenhouse drying (SD), solar greenhouse with intermittent heat pump drying (SIHP), hot air drying (HA) and heat pump drying (HP). Among the four drying methods, HP achieved the highest drying rate at a range from 0.054 g H₂O·(g DM)^-1·min^-1 to 0.212 g H₂O·(g DM)^-1·min^-1 while SD had the lowest drying rate, measured at 0.042 g H₂O·(g DM)^-1·min^-1. The analysis on colour kinetics revealed that there is no significant colour loss (p > 0.05) observed from HP's dried Roselle. Greater amount of flavonoid compounds i.e. protocatechuic acid was found in SD and SIHP dried finished product whereas HP's dried Roselle contains higher percentage of catechin as compared to other drying methods.

关键词: Hibiscus sabdariffa L., Drying, Heat pump, Total colour change, Protocatechuic acid, Catechin

Abstract: The drying kinetics of Roselle (Hibiscus sabdariffa L.) of variety Terengganu (UMKL-1) and the quality attribution of Roselle were studied. The experiments were conducted using four different drying methods, including solar greenhouse drying (SD), solar greenhouse with intermittent heat pump drying (SIHP), hot air drying (HA) and heat pump drying (HP). Among the four drying methods, HP achieved the highest drying rate at a range from 0.054 g H₂O·(g DM)^-1·min^-1 to 0.212 g H₂O·(g DM)^-1·min^-1 while SD had the lowest drying rate, measured at 0.042 g H₂O·(g DM)^-1·min^-1. The analysis on colour kinetics revealed that there is no significant colour loss (p > 0.05) observed from HP's dried Roselle. Greater amount of flavonoid compounds i.e. protocatechuic acid was found in SD and SIHP dried finished product whereas HP's dried Roselle contains higher percentage of catechin as compared to other drying methods.

Key words: Hibiscus sabdariffa L., Drying, Heat pump, Total colour change, Protocatechuic acid, Catechin

Thing Chai Tham, Mei Xiang Ng, Shu Hui Gan, Lee Suan Chua, Ramlan Aziz, Luqman Chuah Abdullah, Sze Pheng Ong, Nyuk Ling Chin, Chung Lim Law. Impacts of different drying strategies on drying characteristics, the retention of bio-active ingredient and colour changes of dried Roselle[J]. Chinese Journal of Chemical Engineering, 2018, 26(2): 303-316.

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Impacts of different drying strategies on drying characteristics, the retention of bio-active ingredient and colour changes of dried Roselle

Impacts of different drying strategies on drying characteristics, the retention of bio-active ingredient and colour changes of dried Roselle

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