Main content

One-way Degassing Valve Behavior & Function in The Acceptability of Stored Coffee

Show full item record

Title: One-way Degassing Valve Behavior & Function in The Acceptability of Stored Coffee
Author: Cowell, Jessey
Department: Department of Food Science
Program: Food Science
Advisor: Lim, Loong-Tak
Abstract: In this research, the opening/closing behavior of low-profile and button one-way degassing valves were examined with varying silicone oil viscosities (20, 70, 160 and 1100 mPa·s), valves were exposed to darkly roasted fine and coarse grind coffee degas. Furthermore, the degassing rates of fine and coarse coffees were approximated with two-component empirical models, enabling the simulation of CO2 degas behavior via a programmable infusion pump. Oxygen ingress was measured in real-time while the valve was exposed to fine and coarse coffee degas to evaluate the effect of opening/closing behavior on the ingress of air. In addition, consumer acceptability and discrimination testing between reference and treated samples stored in fraction pouches with oiled low-profile and button valves, as well as un-oiled low profile and no valve samples, were conducted in 7 sensory evaluations over a 12-week duration. Headspace analysis of key volatile concentrations was also performed on the brewed coffee.
Date: 2018-09-19
Terms of Use: All items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.

Files in this item

Files Size Format View
Cowell_Jessey_201809_Msc.pdf 5.061Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record

The library is committed to ensuring that members of our user community with disabilities have equal access to our services and resources and that their dignity and independence is always respected. If you encounter a barrier and/or need an alternate format, please fill out our Library Print and Multimedia Alternate-Format Request Form. Contact us if you’d like to provide feedback:  (email address)