Featured Research

from universities, journals, and other organizations

Research At Great Lakes Meeting Shows More Vitamin C In Organic Oranges Than Conventional Oranges

Date:
June 3, 2002
Source:
American Chemical Society
Summary:
Organically-grown oranges contain up to 30% more vitamin C than those grown conventionally, it was reported at a Great Lakes Regional meeting of the American Chemical Society.

MINNEAPOLIS, June 2 — Organically-grown oranges contain up to 30% more vitamin C than those grown conventionally, it was reported today at a Great Lakes Regional meeting of the American Chemical Society, the world's largest scientific society. The Great Lakes meeting is being held at the Radisson Hotel Metrodome June 2-4 and more than 400 scientists and students are expected to attend. This research paper is being presented in Memorial Hall of the McNamara Alumni Center at the University of Minnesota. Theo Clark, a visiting chemistry professor at Truman State University (Kirksville, Mo), reported the finding based on work done by him and a group of undergraduate students. He said he decided to conduct the analysis because of a lack of analytical information about the nutritional content of organically-grown produce.

"Quite often, organic goods come from smaller farms that market their goods with provocative labels such as ‘healthy,' ‘delicious,' or ‘natural'," he said. "These statements are generally made without reference to any comparable standards." Clark added that he chose oranges to begin the assessment because they are high-profile fruits. "The orange is the traditional source of vitamin C, and it is highly commercialized, but no one to our knowledge has thought to compare the organic and conventionally-grown oranges."

Conventional oranges are larger than organically-grown oranges, and they have a deeper orange color. Because of their size, "we were expecting twice as much vitamin C in the conventional oranges," said Clark. But to his surprise, chemical isolation combined with nuclear magnetic resonance (NMR) spectroscopy revealed that the organically-grown oranges contained 30% more vitamin C than the conventionally-grown fruits — even though they were only about half the size.

Clark said the reason for the added nutritional punch isn't clear, but "we speculate that with conventional oranges, (farmers) use nitrogen fertilizers that cause an uptake of more water, so it sort of dilutes the orange. You get a great big orange but it is full of water and doesn't have as much nutritional value," said Clark. "However, we can only speculate. Other factors such as maturity, climate, processing factors, packaging, and storage conditions require consideration."

In addition to the chemical analysis, Clark and his team conducted a survey of 27 households (approximately 71 individuals) in the rural town of Miller, Mo., to gauge their expectations of organic oranges. Eighty five percent of respondents believed that organic oranges would have a higher nutritional content than their conventionally-grown counterparts, and Clark's research shows that "they were right on." However, 65% believed that there was little or no price difference between the two types of oranges. In fact, Clark's team found that organic oranges cost an average of twice as much.

Clark says these issues are important because consumers have a right to know the real nutritional content of organic produce, and hard numbers such as the vitamin C content can validate the claims of the burgeoning organic industry. On the other hand, farmers considering a change from conventional to organic farming methods need to know what consumers expect, and what they are willing to pay for it.


Story Source:

The above story is based on materials provided by American Chemical Society. Note: Materials may be edited for content and length.


Cite This Page:

American Chemical Society. "Research At Great Lakes Meeting Shows More Vitamin C In Organic Oranges Than Conventional Oranges." ScienceDaily. ScienceDaily, 3 June 2002. <www.sciencedaily.com/releases/2002/06/020603071017.htm>.
American Chemical Society. (2002, June 3). Research At Great Lakes Meeting Shows More Vitamin C In Organic Oranges Than Conventional Oranges. ScienceDaily. Retrieved September 16, 2014 from www.sciencedaily.com/releases/2002/06/020603071017.htm
American Chemical Society. "Research At Great Lakes Meeting Shows More Vitamin C In Organic Oranges Than Conventional Oranges." ScienceDaily. www.sciencedaily.com/releases/2002/06/020603071017.htm (accessed September 16, 2014).

Share This



More Plants & Animals News

Tuesday, September 16, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Some Tobacco Farmers Thrive Amid Challenges

Some Tobacco Farmers Thrive Amid Challenges

AP (Sep. 16, 2014) The South's tobacco country is surviving, and even thriving in some cases, as demand overseas keeps growers in the fields of one of America's oldest cash crops. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Conservationists Face Uphill PR Battle With New Shark Rules

Conservationists Face Uphill PR Battle With New Shark Rules

Newsy (Sep. 14, 2014) New conservation measures for shark fishing face an uphill PR battle in the fight to slow shark extinction. Video provided by Newsy
Powered by NewsLook.com
Shocker: Journalists Are Utterly Addicted To Coffee

Shocker: Journalists Are Utterly Addicted To Coffee

Newsy (Sep. 13, 2014) A U.K. survey found that journalists consumed the most amount of coffee, but that's only the tip of the coffee-related statistics iceberg. Video provided by Newsy
Powered by NewsLook.com
Lion Cubs the Pride of San Diego Zoo

Lion Cubs the Pride of San Diego Zoo

Reuters - US Online Video (Sep. 13, 2014) Roars of excitement as a proud lioness shows off her four cubs at the San Diego Zoo Safari Park. Jillian Kitchener reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins