Navigation Links
Hydrocooling shows promise for reducing strawberry weight loss, bruising

GAINESVILLE, FLStrawberries are very fragile and highly susceptible to mechanical injury during commercial production. Growers interested in ways to increase profits and reduce product loss are seeking improved handling and temperature management techniques. Collaborative research from scientists from the Brazilian Agricultural Research CorporationEmbrapa and the University of Florida contains several findings that show promise to significantly improve commercial strawberry handling.

Because of their fragile nature, strawberries must be harvested when they are ripe to minimize bruising, a critical concern leading to product and revenue losses for growers. Bruising is caused by impact, compression, and vibration forces. Impact bruising results from a sudden sharp forcefor example when a fruit falls onto another fruit or onto a hard surface, or when an object strikes the fruit. Compression bruising occurs when tissue is subjected to a constant force such as during hand-harvest (finger pressure), or when the fruit is on the bottom layer of a container.

To replicate commercial handling conditions, the research team used forced-air or hydrocooling with three strawberry cultivars ('Chandler', 'Oso Grande', and 'Sweet Charlie') to reach pulp temperatures of 1 or 30C, then subjected the fruit to compression and impact forces. The fruit was subsequently evaluated for bruising; each berry was sliced through the center of the impact area and was considered to be bruised if damaged tissue was visible below the impact area.

Strawberries with a pulp temperature of 24C exhibited sensitivity to compression but greater resistance to impacts. As pulp temperature decreased, fruit were less susceptible to compression, as shown by up to 60% reduction in bruise volume. In contrast, strawberries at 1C pulp temperature had more severe impact bruising, with up to 93% larger bruise volume than at 24C, depending on the cultivar.

Strawberries also showed different susceptibility to impact bruises depending on the cooling method. Impacted fruit that were forced-air cooled had larger bruise volumes than those that were hydrocooled. The impact bruise volume for strawberries forced-air cooled to 1C was 29% larger than for fruit hydrocooled to 20C, 84% higher than those forced-air cooled to 20C, and 164% higher than those hydrocooled to 1C.

The results proved that strawberries had different responses to compression and impact forces based on pulp temperature. Fruit at low temperature were more resistant to compression, while fruit at higher temperatures were more resistant to impact. This finding translates to practical recommendations for commercial strawberry growers, suggesting that fruit bruising caused by compression may be minimized by harvesting and transporting early in the day when pulp temperatures are lowest.

According to the report, "there is potential for strawberries to be graded and packed on a packing line; however, impact bruising at transfer points must be minimized. In this scenario, the strawberries could be harvested into field lugs (two or three layers deep of fruit) and transported to the packing house. It would be more advantageous to use hydrocooling than forced-air cooling because hydrocooling cools fruit at a much faster rate."

The authors added that because incidence and severity of impact and compression bruises are temperature-dependent, strawberry growers should consider pulp temperature for harvest scheduling and for potential grading on a packing line. "Hydrocooling shows to rapidly cool strawberry fruit while reducing weight loss and bruising sensitivity," they concluded.


Contact: Michael W. Neff
American Society for Horticultural Science

Related biology news :

1. Global study shows health joins green as business strategy
2. New study shows rising water temperatures in US streams and rivers
3. Peregrine reports new study from Duke shows anti-HIV potential of targeting PS on cells
4. Study shows compulsive eating shares addictive biochemical mechanism with cocaine, heroin abuse
5. US women and minority scientists discouraged from pursuing STEM careers, national survey shows
6. A marine Mr. Mom: Male pipefish gives birth, but some are deadbeat dads, study shows
7. Study shows potential for using algae to produce human therapeutic proteins
8. Study shows woody plant encroachment has increased stream flow in the Edwards Plateau
9. New study shows teens who drink 100 percent fruit juice have more nutritious diets overall
10. An apple a day? Study shows soluble fiber boosts immune system
11. UAB study shows African-Americans have highest stroke rate, southerners more likely to die
Post Your Comments:
Related Image:
Hydrocooling shows promise for reducing strawberry weight loss, bruising
(Date:11/9/2015)... Nov. 09, 2015 ... of the "Global Law Enforcement Biometrics ... --> ) has announced ... Enforcement Biometrics Market 2015-2019" report to ... Markets ( ) has announced the ...
(Date:11/2/2015)... PARK, Calif. , Nov. 2, 2015  SRI ... $9 million to provide preclinical development services to the ... the contract, SRI will provide scientific expertise, modern testing ... wide variety of preclinical pharmacology and toxicology studies to ... --> The PREVENT Cancer Drug Development ...
(Date:10/29/2015)... 2015 Daon, a global leader in mobile ... a new version of its IdentityX Platform , ... America have already installed IdentityX v4.0 and ... FIDO UAF certified server component as an ... FIDO features. These customers include some of the largest ...
Breaking Biology News(10 mins):
(Date:11/24/2015)... PA (PRWEB) , ... November 24, 2015 , ... This ... entrepreneurs at competitive events in five states to develop and pitch their BIG ideas ... projects from each state are competing for votes to win the title of SAP's ...
(Date:11/24/2015)... SHPG ) announced today that Jeff Poulton , ... Annual Healthcare Conference in New York City ... (1:30 p.m. GMT). --> SHPG ) announced today that ... Piper Jaffray 27 th Annual Healthcare Conference in ... at 8:30 a.m. EST (1:30 p.m. GMT). --> Shire ...
(Date:11/24/2015)... , Nov. 24, 2015  Tikcro Technologies Ltd. (OTCQB: TIKRF) today announced ... 29, 2015 at 11:00 a.m. Israel time, at ... 98 Yigal Allon Street, 36 th Floor, Tel Aviv, ... Eric Paneth and Izhak Tamir to the Board of ... as external directors; , approval of an amendment to certain terms ...
(Date:11/24/2015)...  Twist Bioscience, a company focused on synthetic ... Bioscience chief executive officer, will present at the ... 2015 at 3:10 p.m. Eastern Time at The Lotte New ... --> --> About Twist ... on Twitter. Sign up to follow our Twitter ...
Breaking Biology Technology: