UNDERSTANDING CLARIFICATION OF SWEET ORANGE JUICE BY MICROFILTRATION AND FOULING BEHAVIOUR

Authors

Abstract

Sweet orange is a important citrus fruit grown throughout the world as it rich in phytonutrients properties and excellent source of vitamin C.  The conventional clarification process involves more costs with personnel, equipment, and physical space. As an alternative, microfiltration (MF) has been applied in fruit juices for clarification. Clarification of sweet orange juice was carried out by microfiltration process using 0.2 µm size cellulose acetate MF membrane in a stirred cell. Flux decline was majorly due to deposits formed with soluble and suspended fraction of pectin, proteins and fibers, forming a low methoxy gel layer on membrane surface causing fouling during clarification. Long term flux decline was dictated by intermediate pore blocking in combination with growth of gel layer over the membrane surface. Reversible resistance was considered as domineering resistance and therefore, 90% of original permeate flux was recovered by following proper washing protocol to clean membranes. It was noticed that most of the total soluble solids (TSS), pH and vitamin C expressed as ascorbic acid of the feed were recovered in the permeate after filtration and there was no loss of the important properties pertaining to sweet orange juice.

Author Biographies

SATYANARAYANA CHVV, ACHARYA NG RANGA AGRICULTURAL UNIVERSITY

PROFESSOR & HEAD

DEPARTMENT OF FOOD PROCESS ENGINEERING,

DR. NTR COLLEGE OF FOOD SCIENCE & TECHNOLOGY,  BAPATLA - 522 101, ANDHRA PRADESH, INDIA

SMITH, DD, ACHARYA NG RANGA AGRICULTURAL UNIVERSITY

ASSCOCIATE DEAN

COLLEGE OF FOOD SCIENCE & TECHNOLOGY

PULIVENDULA, KADAPA , ANDHRA PREDESH, INDIA

LAKSHMIPATHY R, ACHARYA NG RANGA AGRICULTURAL UNIVERSITY

ASSOCIATE PROFESSOR (MICROBIOLOGY)

AGRICULTURAL RESEARCH STATION, AMARAVATI

GUNTUR, ANDHRA PRADESH

BHASKARARAO D, ACHARYA NG RANGA AGRICULTURAL UNIVERSITY

PROFESSOR & UNIVERSITY HEAD (BASIC ENGG)

DR. NTR COLLEGE OF AGRICULTURAL ENGINEERING, BAPATLA, ANDHRA PRADESH, INDIA

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Published

2023-06-28

Issue

Section

VI-Postharvest Technology and Process Engineering