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Recently, the team of Professor Wu Cai'e of the School of Light Industry and Food of Nanjing Forestry University published a title entitled "Pulsed light improved the shelf life of apricot (after simulated long-distance air) in Postharvest Biology and Technology (IF=6.
751), a TOP journal in the field of agriculture and forestry science transportation) by regulating cell wall metabolism"
.
Master student Hua Xiaowen is the first author, Associate Professor Li Tingting is the only corresponding author of this paper, and Nanjing Forestry University is the first completer
.
Little white apricot is called "akqimisi" in Uyghur, which means "white honey"
.
They usually require long-distance air freight to reach the consumer market, but vibrations during transportation are one of
the main reasons why apricots ripen and soften before they are sold.
Vibrations destroy the cellular structure of fruits and vegetables, accelerating the outflow of water from their tissues, causing the fruit to soften and lose moisture
.
Softened fruits are more susceptible to physical damage, disease, and physiological disorders
.
Pulsed intense light (IPL) treatment is a promising non-thermal technology that enables microbiological safety and maintains the properties of
fresh food.
The light intensity of each pulse is about 2×10to 4 times
that of the sun at the surface of the sea.
By converting electrical energy into light energy in a very short time (microseconds), pulsed technology can achieve peak energy far beyond the UV light source with a wide spectral range, resulting in high transmittance
.
The test bench simulates the air transport environment
from Xinjiang to cities in central China according to the example of the American random vibration power spectral density curve according to GB/T 4857.
23-200 and ASTM 4728-1995 standards.
Generally speaking, the simulated vibration intensity is determined by different loads, different vibration damping systems, different road conditions, different weather, different driving speeds, etc.
, and the collective vibration intensity is an average
.
1.
Flow chart of the apricot pretreatment and simulated-vibration test systems.
A) apricot, B) the intensive pulsed light (IPL) treatment system, C) the simulated air transportation vibration test system, and D) the vibration curve during simulated transportation.
Fig.
2.
A) The effects of pretreatments on sensory attributes of apricot during storage.
B) The appearance of apricots during storage.
Fig.
4.
The effects of an intensive pulsed light (IPL) pretreatment on water distribution in apricot cells during storage (A), a nuclear magnetic resonance proton density image (B), and a pseudo color image f apricot (C).
CK: Vibrational stress, IPL: pulsed light treatment pretreatment followed by vibration stress.
The transverse relaxation time represents the fluidity of water, and the corresponding water mass (signal region) is 0.
1–10 ms for cell wall (bound water), 10–100 ms for cytoplasm (loosely bound water), and 100–1000 ms for water content in the vacuole (free water).
Fig.
8.
Transmission electron microscope images of apricot tissues during early storage.
CK: vibrational stress, IPL: intensive pulsed light pretreatment followed by vibrational stress.
CW: cell wall, Chl: chloroplast, V: vacuole, ICS: intercellular space, PM: plasma membrane, M: mutilated tissue.
Studies have shown that invisible mechanical damage during transportation can lead to a decrease
in the quality of apricot fruits during storage.
IPL significantly delayed the decrease of fruit hardness, inhibited the increase of membrane permeability and the accumulation
of malondialdehyde.
During storage, the contents of CDTA-soluble pectin, Na2CO3-soluble pectin, cellulose and hemicellulose in IPL-treated fruits were significantly higher than those in the CK treatment group, and the soluble pectin content
was reduced by IPL treatment.
IPL treatment significantly reduced the activity
of the cell wall degrading enzymes PG, CEL, PME and β-GAL.
Transmission electron microscopy observation showed that IPL pretreatment delayed the degradation of apricot pulp cell wall, increased the content of cell wall polysaccharides and inhibited cell structure fragmentation, delaying the aging
of apricot fruit.
Therefore, IPL treatment is an effective means
to reduce the quality loss caused by invisible damage during transportation of apricot fruits during storage.
Project funding
The research work was supported by the National Key R&D Project of China (2019YFD1002300), the Jiangsu Provincial Government Scholarship Program (2019), the Independent Innovation Project of Jiangsu Academy of Agricultural Sciences (CX(21)3030) and the Research Project of Jiangxi Forestry Bureau (No.
202012
).
About the corresponding author
Li Tingting, female, Ph.
D.
in Engineering, Jiangnan University, Associate Professor
.
Assistant Dean of the College of Light Industry and Food of Nanjing Forestry University, Secretary of the Party Branch of the Department of Food Science and Engineering, and the fourth batch of special experts
of "Vice President of Science and Technology (Enterprise Innovation Post)" in Jiangsu Province.
His main research directions are functionalization and high-value processing of new forest foods, mining of active ingredients and health functions of functional foods, postharvest physiology and storage and preservation of forest-derived foods, etc
。 He presided over the sub-projects of the National Key R&D Program (Key Technologies for Value-added Processing of Harvest Consequences and By-products of Characteristic Economic Forests) (Research and Application of Green Prevention and Control and Safety Monitoring Technology for Postharvest Diseases of Fruits of Characteristic Economic Forests), Jiangsu Youth Fund Projects (Analysis of the Structure and Activity Function of Camellia oleifera Meal Glycoprotein Based on Deglycosylation Transformation), Jiangsu Subei Science and Technology Special Project (Preparation and Industrialization Development of Complex Prebiotic Ginkgo Oligosaccharides) and other key projects
at or above the provincial and ministerial level.
He has published more than 100 journal papers, more than 50 SCI papers, 18 patent authorizations, and participated in the compilation of 4 national planning textbooks
.
He won the second prize of the National Liangxi Forestry Science and Technology Progress Award and the second prize
of the Jiangsu Micro-course Competition.
First author bio
Hua Xiaowen is a 2020 master's student
at the School of Light Industry and Food Science, Nanjing Forestry University.
His research interests include postharvest biology and storage and preservation of forest fruit foods, and the research topic is "Defensive effect of pulsed intense light treatment on postharvest apricot fruit infection by Alternaria finesse"
.
As the first author, he published 2 SCI papers in Postharvest Biology and Technology
.
