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Japanese citrus eyed as potential pectin source

 
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JoeReal
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Posted: Thu 30 Aug, 2007 2:32 pm

http://www.foodnavigator.com/news/ng.asp?n=79193-pectin-citrus-jams

Japanese citrus eyed as potential pectin source

By Stephen Daniells

23/08/2007 - The Japanese citrus fruit Citrus depressa yields high methoxyl pectin in higher quantities than grapefruit and lemon, and could be used as a gelling agent, researchers from Japan have reported.

"The extracted pectin has the potential for utilisation in the food industry as a binder and stabiliser in jams, jellies, beverages and fruit juices," wrote the researchers, from Kagoshima University and University of the Ryukyus.

The research, published in the journal Food Chemistry, taps into the growing trend for alternative and novel sources of pectin, highlighted by an increasing number of studies looking at extracting pectin from sources such as sugar beet, pumpkin and squash.

The functionality of pectin is dictated by the chemical fine structure, and the majority of the pectin used currently comes from citrus peel and apple pomace. Other sources of the ingredient have remained largely unexploited because of certain undesirable structural properties.

Lead author Yukihiro Tamaki reports that the fruit is regarded as a significant agricultural product in Okinawa, Japan, and expects C. depressa to be effectively utilised and exploited in the future.

One such use of the fruit could be as a pectin source, said the researchers, reporting a yield of 4.1 per cent from the endocarp (the hard inner layer surrounding the seeds inside the fruit). This yield was slightly higher than recorded yields of lemon (between three and four per cent) and grapefruit (3.3 to 4.5 per cent), they said.

Chemical analysis showed that galacturonic acid accounted for 89 per cent of the total sugar content of the pectin, while sugars such as xylose and glucose, which are often present in pectin from citrus sources, were not detected by the researchers.

Further analysis showed that the degree of methoxylation (DM) was 66.2 per cent, making the pectin a high methoxyl pectin and therefore suitable for use in jellies, jams, and confectionery uses.

The use of the pectin as a potential gelling agent was confirmed by adding sucrose (60 per cent) and citric acid to a solution of the pectin.

"The results were consistent with the physicochemical properties of commercial pectins (galacturonic acid less than 65 per cent, degree of methoxylation 30 to 75 per cent, degree of acetylation less than 5 per cent, neutral sugars less than 15 per cent, and molecular mass between 100,000 to 200,000), as reported in the literature," wrote the authors.

"More research is needed on extracted pectin from C. depressa for effective utilisation in the food, physiological and pharmaceutical industries," they concluded.

Researchers from Denmark and England recently highlighted the possibilities of this ingredient and proposed that 'designer' pectin will become increasingly common in the future (Trends in Food Science & Technology, Vol. 17, pp. 97-104).

The ingredient, with worldwide production estimated at 35,000 tonnes a year, is currently widely used as gelling agents in jams, confectionery, and bakery fillings, and stabilisers in yoghurts and milk drinks.

Source: Food Chemistry (Elsevier)
Published online ahead of print, 17 August 2007, doi: 10.1016/j.foodchem.2007.08.027
"Isolation and structural characterisation of pectin from endocarp of Citrus depressa"
Authors: Y. Tamaki, T. Konishi, M. Fukuta and M. Tako
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Millet
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Posted: Thu 30 Aug, 2007 4:31 pm

........(Citrus depressa) significant agricultural product in Okinawa, ........ I lived on the island of Okinawa for two years, and never seen even one citrus tree of any kind growing anywhere on the island. I know they grow mandarins in Southern Japan, and Okinawa is warmer and a lot closer to the equator than is Japan. - Millet
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JoeReal
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Posted: Thu 30 Aug, 2007 5:29 pm

Citrus depressa is also in the UCR Citrus collection but is not available for budwood distribution. Does anyone have this?

There are many other various medicinal properties in very credible organizations. It has nobelitin for example which can be used for anti-tumour and the latest one for reversing learning impairment:


http://jpet.aspetjournals.org/cgi/content/abstract/321/2/784
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Laaz
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Posted: Thu 30 Aug, 2007 7:07 pm

It is also known as Shekwasha Tangerine. I thought someone had these available before... May have been on Ebay or one of the online stores.

I think it may have been Darren who had this as well. Gaylord may have this also.

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Millet
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Posted: Thu 30 Aug, 2007 9:04 pm

Well, if Citrus depressa is also known as Shekwasha Tangerine I have several Shekwasha Tangerine trees growing in the greenhouse at the present time. In fact, I think I tossed two other Shekwashas out onto the compost pile a month or so ago. - Millet
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JoeReal
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Posted: Thu 30 Aug, 2007 9:42 pm

Millet, I would appreciate it if you can send me some seeds, Wink Joe
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Laaz
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Posted: Thu 30 Aug, 2007 10:00 pm

http://lib.ucr.edu/agnic/webber/Vol1/Chapter4.html

Quote:
Citrus depressa Hayata (formerly C. pectinifera Tan.)—This species is the shiikuwashâ of Okinawa and Taiwan and shekwasha or sequasse in collections in the United States. The tree is vigorous, round-topped, and finely stemmed. The fruit is very small, orange-colored, oblate, and highly depressed at both ends, with very thin, loose, and aromatic rind. The flesh is soft, gelatinous, and acid, but ultimately attains a rich flavor. The seeds are polyembryonic with green cotyledons. The tree makes an attractive ornamental.

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SusanB
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Posted: Thu 30 Aug, 2007 10:08 pm

Tradewinds Fruit has seeds. I bought some but they haven't germinated. Yet.
<hoping>
Susan

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Millet
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Posted: Thu 30 Aug, 2007 10:40 pm

Susan, if your seed came from Tradewinds, good luck on ever getting them the germinate. Joe, The trees that I have are seedlings, and not very big. I really do not remember who gave me the Shekwasha seed, but it probably was either Citrus Joe, or Ned, however, I could be wrong. Because, many of the Shekwasha seeds germinated, and grew, I kept only two of the trees and tossed the rest. It will be quite some time before they fruit, at least 3 years or so. - Millet
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SusanB
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Posted: Thu 30 Aug, 2007 11:41 pm

Ack! Gee Millet, that's not what I wanted to hear! Bad reputation? The seeds looked OK when I got them...

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Millet
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Posted: Fri 31 Aug, 2007 12:39 am

Susan, it all depends how fresh the seeds are, any seed sold at this time of year probably came from last years crop. If you type Tradewinds into the search forum, you will see a lot of dissatisfied customers. - Millet
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SusanB
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Posted: Fri 31 Aug, 2007 1:29 am

OK, if anyone is going to toss plants, I'd be happy to pay for postage to send them to me!

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