Featured Research

from universities, journals, and other organizations

Antioxidants extracted from grape seeds, skin show promise for health

Date:
June 17, 2014
Source:
University of Florida Institute of Food and Agricultural Sciences
Summary:
They normally go to landfills as waste, but grape seeds and skin are full of antioxidants, and researchers used enzymes to extract the nutritious elements in a recent study. But by using cellulase, pectinase and glucosidase, scientists found the grape seeds and skin aren’t just a waste product. The enzymes increase the antioxidant activity, from the grape seeds and skins. New uses could include food additives or nutritional supplements.

Soaking muscadine grape seeds or skins in a solution of enzymes can boost antioxidants extracted from the fruit, creating possible new uses for grape leftovers, which are loaded with nutrients, a University of Florida study shows.

After making wine, a producer typically sends the grape seeds and skins to a landfill, said Maurice Marshall, a UF/IFAS food science and human nutrition professor and study co-author. But by using cellulase, pectinase and glucosidase, scientists found the grape seeds and skin aren’t just a waste product. The enzymes increase the antioxidant activity, from the grape seeds and skins. New uses could include food additives or nutritional supplements.

Changmou Xu, a doctoral student in food science and human nutrition at UF, led the study under Marshall’s advisement. Researchers ground muscadine skin or seeds to a powder and extracted phenolics by soaking the powder in a solution of enzymes, Marshall said.

Through that process, Xu and other researchers examined how enzymes break down grape seeds and skin so they could obtain phenolics and antioxidants. They hoped that by treating grape skins and seeds with enzymes that break down cell walls, they could make it easier to extract phenolic compounds.

The enzymes actually decreased the phenolics from the discarded material. That was the downside, said Marshall, who’s supervising Xu’s doctoral work. On the upside, enzyme hydrolysis ─ a form of digestion ─ can release more antioxidants, Marshall said.

“You got less phenolics, but you improve their antioxidant activity,” he said.

Muscadine grapes grow well in Florida and have thick skin that accounts for about 40 percent of the fruit’s weight. The skin gives the muscadine natural resistance to disease, fungi and insects, and it stores many antioxidants, the study said.

Grape phenolics serve as anti-inflammatory agents, can reduce the risk of certain cancers and help prevent high blood pressure and heart disease, Marshall said.

Skin and seed extract from muscadine grapes can be used as a food additive or nutritional supplement, Marshall said. Currently, the food industry puts synthetic antioxidants into food to preserve it, he said. Synthetic antioxidants also preserve fats and oils in cosmetics and pharmaceuticals.

The phenolics extracted during the UF study, on the other hand, are natural, not synthetic, antioxidants.

“This concept of using natural antioxidants in many different things in the food world is a nice concept to consumers,” he said.

In addition to Xu and Marshall, study co-authors were Yavuz Yagiz, a senior chemist in food science and human nutrition at UF; Wlodzimierz Borejsza-Wysocki, IR-4 research programs coordinator at UF; Jiang Lu, professor of viticultural sciences at Florida A&M University and Milena Ramirez-Rodrigues, a former doctoral student in food science and human nutrition.

The study was published in the February online edition of the journal Food Chemistry and is scheduled to be in the journal’s print edition in August.


Story Source:

The above story is based on materials provided by University of Florida Institute of Food and Agricultural Sciences. The original article was written by Brad Buck. Note: Materials may be edited for content and length.


Journal Reference:

  1. Changmou Xu, Yavuz Yagiz, Wlodzimierz Borejsza-Wysocki, Jiang Lu, Liwei Gu, Milena M. Ramνrez-Rodrigues, Maurice R. Marshall. Enzyme release of phenolics from muscadine grape (Vitis rotundifolia Michx.) skins and seeds. Food Chemistry, 2014; 157: 20 DOI: 10.1016/j.foodchem.2014.01.128

Cite This Page:

University of Florida Institute of Food and Agricultural Sciences. "Antioxidants extracted from grape seeds, skin show promise for health." ScienceDaily. ScienceDaily, 17 June 2014. <www.sciencedaily.com/releases/2014/06/140617130803.htm>.
University of Florida Institute of Food and Agricultural Sciences. (2014, June 17). Antioxidants extracted from grape seeds, skin show promise for health. ScienceDaily. Retrieved September 19, 2014 from www.sciencedaily.com/releases/2014/06/140617130803.htm
University of Florida Institute of Food and Agricultural Sciences. "Antioxidants extracted from grape seeds, skin show promise for health." ScienceDaily. www.sciencedaily.com/releases/2014/06/140617130803.htm (accessed September 19, 2014).

Share This



More Plants & Animals News

Friday, September 19, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Chocolate Museum Opens in Brussels

Chocolate Museum Opens in Brussels

AFP (Sep. 19, 2014) — Considered a "national heritage" in Belgium, chocolate now has a new museum in Brussels. In a former chocolate factory, visitors to the permanent exhibition spaces, workshops and tastings can discover derivatives of the cocoa bean. Duration: 01:00 Video provided by AFP
Powered by NewsLook.com
Could Grief Affect The Immune Systems Of Senior Citizens?

Could Grief Affect The Immune Systems Of Senior Citizens?

Newsy (Sep. 19, 2014) — The study found elderly people are much more likely to become susceptible to infection than younger adults going though a similar situation. Video provided by Newsy
Powered by NewsLook.com
Jury Delivers Verdict in Salmonella Trial

Jury Delivers Verdict in Salmonella Trial

AP (Sep. 19, 2014) — A federal jury has convicted three people in connection with an outbreak of salmonella poisoning five years ago that sickened hundreds of people and was linked to a number of deaths. (Sept. 19) Video provided by AP
Powered by NewsLook.com
Raw: Elephant Undergoes Surgery in Tbilisi Zoo

Raw: Elephant Undergoes Surgery in Tbilisi Zoo

AP (Sep. 18, 2014) — Grand the elephant has successfully undergone surgery to remove a portion of infected tusk at Tbilisi Zoo in Georgia. British veterinary surgeons used an electric drill to extract the infected piece. (Sept. 18) Video provided by AP
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