Laboratory canning and evaluation of dry beans are common practices for testing
canning quality of cultivars before commercial release to canning industries. Suitable
laboratory canning and evaluation procedures for small white beans in tomato sauce
were identified. Standard values for choice and standard grade beans for laboratory
evaluation of canning quality were defined, using four small white bean cultivars
from nine localities during the 2000/01 season. The cultivar Teebus was used as
reference standard for choice grade beans and its canning quality complied with
international guidelines when the modified canning technique (MCT) was used. From
the laboratory and modified canning evaluation procedures hydration coefficient,
percentage washed drained weight, visual appearance (scale 1 to 10), splits (scale 1 to
10), texture (kg.100 g -1 .12 s -1 ), size, clumping, L-values, aL-values and bL-values were
identified as suitable canning parameters for small scale evaluation of beans.
Beans canned with the MCT were also canned and evaluated industrially and results
compared. The interpretation of the different canning parameters with laboratory and
industrial canning were simplified by the use of canonical variate analysis (CVA).
Canonical variate analysis indicated the same groupings for cultivars according to
choice and standard grade canning quality for laboratory and industrial canned beans.
Laboratory canning and evaluation could be used in the evaluation of the canning
quality of beans intended for industrial canning.
Canning quality of seven small white bean cultivars from 33 localities and two
seasons was determined with the MCT and CVA. Cultivars with acceptable and
unacceptable canning quality were identified using laboratory evaluation and CVA.
The CVA resulted in a prediction model for canonical variates 1 and 2 (CV 1 and
CV 2) by identifying two discriminative equations for CV 1 and CV 2 scores. The
CVA for environments identified differences in the canning quality of beans from
different regions, while also indicating seasonal differences. The canning quality of
dry bean cultivars from different environments can be determined using CVA.
The model equations for the prediction of the canning quality of small white beans
were validated on four cultivar samples from four regions (2000/01 season) and 24 breeding samples from three localities (2002/03 season) that were not included in the
development of the model. The CVA and the model identified the same entries from
breeding trials over localities not to be significantly different from Teebus (P > 0.05)
in canning quality, but were unable to group cultivars statistically correct according to
choice grade. The model was however capable of grouping standard and choice grade
cultivars separately. The model could be applied to identify breeding trial entries as
choice grade and to identify entry x locality interactions.
The use of small-scale canning and evaluation procedures in combination with CVA
could be employed to classify cultivar canning quality as either choice- or standard
grade and to determine environmental canning quality. These techniques could be
used, with the assistance of the prediction model to compare samples from a breeding
program with a reference standard.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:ufs/oai:etd.uovs.ac.za:etd-05162005-151557 |
| Date | 16 May 2005 |
| Creators | Van Loggerenberg, Magdalena |
| Contributors | Prof. G. Osthoff, Mr. A.J. Pretorius |
| Publisher | University of the Free State |
| Source Sets | South African National ETD Portal |
| Language | en-uk |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.uovs.ac.za//theses/available/etd-05162005-151557/restricted/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to University Free State or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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