Processing of honey using polymeric microfiltration and ultrafiltration membranes.

Barhate, R. S. and Subramanian, R. and Nandini, K. E. and Umesh Hebbar, H. (2003) Processing of honey using polymeric microfiltration and ultrafiltration membranes. Journal of Food Engineering, 60 (1). pp. 49-54.

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Abstract

Rejection of enzymes and elimination of yeast cells from honeys, using various mol. wt. cut off (MWCO) membranes, were examined in the clarification procedure. Use of membrane technology to produce a honey which is free from microorganisms and suspended matter, but which contains a significant level of enzymes, was also evaluated. Forest/Rock bee honey (Apis dorsata) was strained through a muslin and used in the experiments. Honey samples were analysed for diastase activity, sugars, yeast counts and hydroxymethylfurfural (HMF) value. Permeates from membranes with MWCO of 25-100 (x 103) exhibited no diastase activity; permeate flux rates were 0.9-1.15 kg m-2 h-1. Membrane processing completely removed yeasts. A microfiltration membrane of pore size 100 nm eliminated microorganisms whilst retaining nutritional factors; an ultrafiltration membrane of 20 000 MWCO fractionated this microfiltered honey into 2 fractions, i.e. an enzyme-rich honey (enzymes enriched 2.2x) and a regular ultrafiltered honey. Because honey is viscous, it required dilution before membrane processing, so subsequent vacuum concn was evaluated; as processing temp. increased, HMF value and loss of enzymes increased; it is thus suggested that this process should be conducted at as low a temp. as possible.

Item Type:	Article
Uncontrolled Keywords:	ALDEHYDES-; AMYLASES-; ENZYMES-; FILTRATION-; FURANS-; HONEYS-; MEMBRANES-; MICROORGANISMS-; ULTRAFILTRATION-; YEASTS-; DIASTATIC-ACTIVITY; HYDROXYMETHYLFURFURAL-; MICROFILTRATION-
Subjects:	600 Technology > 08 Food technology > 25 Sugar/Starch/Confectionery 600 Technology > 08 Food technology > 05 Processing and Engineering
Divisions:	Food Engineering
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	05 Aug 2008 09:08
Last Modified:	28 Dec 2011 09:59
URI:	http://ir.cftri.res.in/id/eprint/7575

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