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J Sci Food Agric. 2018 Mar;98(4):1554-1565. doi: 10.1002/jsfa.8627. Epub 2017 Sep 27.

Characteristics and functionality of appetite-reducing thylakoid powders produced by three different drying processes.

Author information

1
Department of Food Technology, Engineering and Nutrition, Faculty of Engineering, Chemical Centre, Lund University, 221 00, Lund, Sweden.
2
Department of Experimental Medical Science, Appetite Control Unit, BMC, Lund University, 221 84, Lund, Sweden.

Abstract

BACKGROUND:

Thylakoids, a chloroplast membrane extracted from green leaves, are a promising functional ingredient with appetite-reducing properties via their lipase-inhibiting effect. Thylakoids in powder form have been evaluated in animal and human models, but no comprehensive study has been conducted on powder characteristics. The aim was to investigate the effects of different isolation methods and drying techniques (drum-drying, spray-drying, freeze-drying) on thylakoids' physicochemical and functional properties.

RESULTS:

Freeze-drying yielded thylakoid powders with the highest lipase-inhibiting capacity. We hypothesize that the specific macromolecular structures involved in lipase inhibition were degraded to different degrees by exposure to heat during spray-drying and drum-drying. We identified lightness (Hunter's L-value), greenness (Hunter's a-value), chlorophyll content and emulsifying capacity to be correlated to lipase-inhibiting capacity. Thus, to optimize the thylakoids functional properties, the internal membrane structure indicated by retained green colour should be preserved. This opens possibilities to use chlorophyll content as a marker for thylakoid functionality in screening processes during process optimization.

CONCLUSION:

Thylakoids are heat sensitive, and a mild drying technique should be used in industrial production. Strong links between physicochemical parameters and lipase inhibition capacity were found that can be used to predict functionality. The approach from this study can be applied towards production of standardized high-quality functional food ingredients. © 2017 Society of Chemical Industry.

KEYWORDS:

chloroplast membrane; drying; lipolysis; physicochemical properties; spinach

PMID:
28816350
DOI:
10.1002/jsfa.8627
[Indexed for MEDLINE]

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