Thermal characteristics of a water soluble extract obtained from pomegranate skin

Developing a state diagram for determining stability

Amani Al-Rawahi, Mohammad Shafiur Rahman, Mostafa Waly, Gilles J. Guillemin

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A water-soluble extract of pomegranate peel was prepared and freeze-dried to measure its thermal characteristics as a function of moisture and temperature. Moisture contents of the freeze-dried extracts varied from 0.018 to 0.950g/g sample. A state diagram of the extract was developed by measuring the freezing curve, glass transition line and ultimate maximal-freeze-concentration conditions. The freezing point decreased with increasing solids; whereas glass transition decreased as solid levels decreased. The freezing point and glass transition were modelled using Chen's model based on the Clausius-Clapeyron equation, and Gordon-Taylor equation, respectively. The ultimate maximal-freeze-concentration conditions were (Tm')u equal to -32.2°C and (Tg‴)u equal to -33.4°C, and the characteristic solids content, Xs' was 0.52g/g sample (i.e. un-freezable water, Xw'=0.48g/g sample), respectively. Similarly the value of Tg' (i.e. vertical line passing through (Tm')u and crossing the glass transition line) was determined as -76.0°C.

Original languageEnglish
Pages (from-to)198-204
Number of pages7
JournalIndustrial Crops and Products
Volume48
DOIs
Publication statusPublished - Jul 2013

Fingerprint

glass transition
heat
extracts
freezing point
water
sampling
freezing
water content
temperature

Keywords

  • Freezing point
  • Glass transition
  • Maximal-freeze-concentration condition
  • Phenolic compounds
  • Stability
  • Un-freezable water

ASJC Scopus subject areas

  • Agronomy and Crop Science

Cite this

@article{bd28c5a0a7764308bb19ce892779a192,
title = "Thermal characteristics of a water soluble extract obtained from pomegranate skin: Developing a state diagram for determining stability",
abstract = "A water-soluble extract of pomegranate peel was prepared and freeze-dried to measure its thermal characteristics as a function of moisture and temperature. Moisture contents of the freeze-dried extracts varied from 0.018 to 0.950g/g sample. A state diagram of the extract was developed by measuring the freezing curve, glass transition line and ultimate maximal-freeze-concentration conditions. The freezing point decreased with increasing solids; whereas glass transition decreased as solid levels decreased. The freezing point and glass transition were modelled using Chen's model based on the Clausius-Clapeyron equation, and Gordon-Taylor equation, respectively. The ultimate maximal-freeze-concentration conditions were (Tm')u equal to -32.2°C and (Tg‴)u equal to -33.4°C, and the characteristic solids content, Xs' was 0.52g/g sample (i.e. un-freezable water, Xw'=0.48g/g sample), respectively. Similarly the value of Tg' (i.e. vertical line passing through (Tm')u and crossing the glass transition line) was determined as -76.0°C.",
keywords = "Freezing point, Glass transition, Maximal-freeze-concentration condition, Phenolic compounds, Stability, Un-freezable water",
author = "Amani Al-Rawahi and Rahman, {Mohammad Shafiur} and Mostafa Waly and Guillemin, {Gilles J.}",
year = "2013",
month = "7",
doi = "10.1016/j.indcrop.2013.04.021",
language = "English",
volume = "48",
pages = "198--204",
journal = "Industrial Crops and Products",
issn = "0926-6690",
publisher = "Elsevier",

}

TY - JOUR

T1 - Thermal characteristics of a water soluble extract obtained from pomegranate skin

T2 - Developing a state diagram for determining stability

AU - Al-Rawahi, Amani

AU - Rahman, Mohammad Shafiur

AU - Waly, Mostafa

AU - Guillemin, Gilles J.

PY - 2013/7

Y1 - 2013/7

N2 - A water-soluble extract of pomegranate peel was prepared and freeze-dried to measure its thermal characteristics as a function of moisture and temperature. Moisture contents of the freeze-dried extracts varied from 0.018 to 0.950g/g sample. A state diagram of the extract was developed by measuring the freezing curve, glass transition line and ultimate maximal-freeze-concentration conditions. The freezing point decreased with increasing solids; whereas glass transition decreased as solid levels decreased. The freezing point and glass transition were modelled using Chen's model based on the Clausius-Clapeyron equation, and Gordon-Taylor equation, respectively. The ultimate maximal-freeze-concentration conditions were (Tm')u equal to -32.2°C and (Tg‴)u equal to -33.4°C, and the characteristic solids content, Xs' was 0.52g/g sample (i.e. un-freezable water, Xw'=0.48g/g sample), respectively. Similarly the value of Tg' (i.e. vertical line passing through (Tm')u and crossing the glass transition line) was determined as -76.0°C.

AB - A water-soluble extract of pomegranate peel was prepared and freeze-dried to measure its thermal characteristics as a function of moisture and temperature. Moisture contents of the freeze-dried extracts varied from 0.018 to 0.950g/g sample. A state diagram of the extract was developed by measuring the freezing curve, glass transition line and ultimate maximal-freeze-concentration conditions. The freezing point decreased with increasing solids; whereas glass transition decreased as solid levels decreased. The freezing point and glass transition were modelled using Chen's model based on the Clausius-Clapeyron equation, and Gordon-Taylor equation, respectively. The ultimate maximal-freeze-concentration conditions were (Tm')u equal to -32.2°C and (Tg‴)u equal to -33.4°C, and the characteristic solids content, Xs' was 0.52g/g sample (i.e. un-freezable water, Xw'=0.48g/g sample), respectively. Similarly the value of Tg' (i.e. vertical line passing through (Tm')u and crossing the glass transition line) was determined as -76.0°C.

KW - Freezing point

KW - Glass transition

KW - Maximal-freeze-concentration condition

KW - Phenolic compounds

KW - Stability

KW - Un-freezable water

UR - http://www.scopus.com/inward/record.url?scp=84878537452&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84878537452&partnerID=8YFLogxK

U2 - 10.1016/j.indcrop.2013.04.021

DO - 10.1016/j.indcrop.2013.04.021

M3 - Article

VL - 48

SP - 198

EP - 204

JO - Industrial Crops and Products

JF - Industrial Crops and Products

SN - 0926-6690

ER -