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Drying Technology
An International Journal
Volume 36, 2018 - Issue 2
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ARTICLES

Clinacanthus nutans Lindau: Effects of drying methods on the bioactive compounds, color characteristics, and water activity

Mei Xiang NgDepartment of Chemical and Environmental Engineering, The University of Nottingham - Malaysia Campus, Semenyih, Selangor Darul Ehsan, Malaysia
,
Thing Chai ThamDepartment of Chemical and Environmental Engineering, The University of Nottingham - Malaysia Campus, Semenyih, Selangor Darul Ehsan, Malaysia
,
Shu Hui GanDepartment of Chemical and Environmental Engineering, The University of Nottingham - Malaysia Campus, Semenyih, Selangor Darul Ehsan, MalaysiaORCID Iconhttp://orcid.org/0000-0001-9527-0836
ORCID Icon,
Lee Suan ChuaInstitute of Bioproduct Development (IBD), Universiti Teknologi Malaysia, Skudai, Johor Bahru, MalaysiaORCID Iconhttp://orcid.org/0000-0003-2493-9963
ORCID Icon,
Rassmlan AzizInstitute of Bioproduct Development (IBD), Universiti Teknologi Malaysia, Skudai, Johor Bahru, Malaysia
,
Mohamed Redza BabaDivision of Industrial Plant, Department of Agriculture, Ministry of Agriculture, Putrajaya, Malaysia
,
Luqman Chuah AbdullahDepartment of Chemical and Environmental Engineering, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
,
Nyuk Ling ChinDepartment of Process and Food Engineering, Universiti Putra Malaysia, Serdang, Selangor, MalaysiaORCID Iconhttp://orcid.org/0000-0001-5787-9149
ORCID Icon,
Sze Pheng OngDepartment of Chemical and Environmental Engineering, The University of Nottingham - Malaysia Campus, Semenyih, Selangor Darul Ehsan, MalaysiaORCID Iconhttp://orcid.org/0000-0001-8965-8711
ORCID Icon &
Chung Lim LawDepartment of Chemical and Environmental Engineering, The University of Nottingham - Malaysia Campus, Semenyih, Selangor Darul Ehsan, MalaysiaCorrespondence[email protected]
ORCID Iconhttp://orcid.org/0000-0003-1305-4537
ORCID Icon show all
Pages 146-159 | Received 20 Jun 2016, Accepted 20 Feb 2017, Published online: 26 Jul 2017
 
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ABSTRACT

The application of solar drying (SD) and heat pump-assisted solar drying (HPSD) on the retention of flavonoid components, total color changes, and water activity of Clinacanthus nutans Lindau leaves were investigated. Analysis of data shows significantly higher extractable yield and flavonoid (orientin and vitexin) percentage during the drying with HPSD. The same drying technique also revealed optimum color values and low water activity. Thin-layer models fitted to the experimental data show that Hii and Law model is suitable for SD, while logarithmic model is able to give a good fit to HPSD.

Acknowledgments

The authors acknowledge the great contribution of Institute of Bioproduct Development, Universiti Teknologi Malaysia.

Conflict of interest

The authors have declared that no competing interest exist.

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