Prune growers of Oregon are faced with the prospect
of large crops and surpluses for the next few years. These
surpluses will probably be felt in both fresh and dried prunes.
This thesis presents the results of an investigation to find.
new markets and new products which will be of value in utilizing
these surpluses. The following products have been investigated
and are included in this report.
Canned prepared dried prunes. A. prolonged study was
made of the effect of prepared Italian prunes on various
types of cans. It was found that plain charcoal cans were
entirely satisfactory over a period of 11 months' storage.
Single enameled cans should not be used as they swell in
less than eight months' storage. Methods of preparation of
prunes for canning were studied. A long pre-soaking was
found most satisfactory, for high quality. Short hot blanch
before canning can be used if proper conditions of syrup and
fill are observed. Yields and costs were given for the two
methods of preparation.
Prune beverages. Three types of prune beverages were
discussed. Pulpy juice was most promising. A cloudy and a
clear beverage were also satisfactory. Yields and costs were
given and compared.
Pitted prune pulp. Small or low-grade dried prunes
were made into pulp by means of a suitable machine. This
product was suitable for use in the bakery trade.
Halved Pitted prunes. Fresh prunes were split and
pitted before drying. The machine to do this was developed
during this investigation. Large savings were effected in
drying time, because of quicker evaporation of moisture from
these halved prunes. Because of shorter drying time and lower
temperature the quality was more nearly that of fresh prunes.
Fresh Prune Juice. Small or low-grade fresh prunes
were used to make a pulpy fresh prune juice. This product
was excellent in flavor and color. Cloudy fresh prune juice
was not satisfactory either in flavor, in body, or in yield.
Fresh Prune Pulp. This was prepared from fresh prunes.
It proved to be a very good means of fresh prune utilization.
The combined effect of the products studied in this
report, if they are developed and marketed, should prove
beneficial to marketing conditions of the northwest Italian
prunes. / Graduation date: 1938
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/26201 |
| Date | 06 1900 |
| Creators | Fenner, Keith Peck, 1914- |
| Contributors | Wiegand, Ernest H. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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