Primary surface measurement reported
The study reports water contact angle (WCA) as a surface-wetting metric for the optimized SCR film.
Client Citation Analysis
Biodegradable films from soyhull cellulosic residue with UV protection and antioxidant properties improve the shelf-life of post-harvested raspberries
This study develops and characterizes an optimized soyhull cellulosic residue (SCR) biodegradable film and reports film surface wettability via water contact angle measured on the film surface.
At-a-Glance Summary
Dropometer attribution in the paper
The paper attributes sessile-drop water contact angle measurement to a “Dropometer (Droplet Lab, Canada)”, using smartphone image capture and sessile drop software to calculate WCA.
How the surface-tension / contact-angle data were used in the study
WCA is used as the study’s quantitative indicator of film surface hydrophobicity/wettability for the optimized film, and is discussed using a hydrophilic/hydrophobic interpretation threshold alongside comparisons to other film types cited in the discussion.
Replication / reliability statement
An average value from triplicate measurements is reported.
Paper Details
Title
Biodegradable films from soyhull cellulosic residue with UV protection and antioxidant properties improve the shelf-life of post-harvested raspberries
Authors
Sumi Regmi; Srinivas Janaswamy
Journal
Food Chemistry
Year
2024
Volume
460
Pages / Article
140672
License
© 2024 Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Journal context
What it is
Journal-level metrics for the publication venue (not a rating of this specific article).
How to read it
Compare metrics within category; updates are annual and lag current-year publications.
Scopus metrics (Elsevier / Scopus rating 2024)
CiteScore 2024
18.3
CiteScore subject ranks (CiteScore 2024)
- Q1 - Chemistry - Analytical Chemistry (3/160)
- Q1 - Agricultural and Biological Sciences - Food Science (10/404)
SNIP 2024
2.153
SJR 2024
1.952
Journal Impact Factor (Clarivate JCR)
Journal Impact Factor (JCR )
9.8
What Was Measured
Primary surface / interfacial measurement
Water contact angle (WCA) was measured on the film surface and reported as a wettability/hydrophobicity indicator for the optimized SCR film.
Supporting measurements
The optimized film is characterized with mechanical properties (tensile strength and elongation at break), water vapor permeability, optical behavior (UV/visible/IR transmittance and transparency), and additional film property measurements that contextualize packaging performance in the study.
Role of the Dropometer
The study uses the Dropometer to measure sessile-drop water contact angle on the film surface: the film is placed on the instrument mount, a water droplet is deposited on the surface, the droplet is imaged using a smartphone interfaced with the equipment, and sessile drop software is used to calculate the water contact angle.
In the Results/Discussion, the reported WCA is interpreted as a wettability/hydrophobicity descriptor for the optimized film and is discussed using a stated hydrophilic/hydrophobic threshold and literature comparisons.
Key Findings
Optimized film wettability quantified by WCA
The optimized SCR film is reported with a water contact angle of 72.6°, presented as the film’s “hydrophobicity” metric in the abstract and as the WCA result in the wettability section.
Paper-stated hydrophilic/hydrophobic interpretation
The authors state that WCA 90° indicates hydrophobic behavior, using this criterion to interpret the film’s surface.
Figure-based presentation of the contact-angle result
The WCA is visually presented as a sessile droplet image with tangent construction in Fig. 2f, where the film is described as hydrophilic with a low water contact angle.
Comparator reference discussed in the WCA section
The discussion cites a low-density polyethylene film WCA of 98.6° as a hydrophobic reference point in contrast to the optimized SCR film’s WCA.
Figures & Visuals
Figure 2 — Multi-property film characterization overview
What it shows
This figure compiles the optimized film’s characterization outputs and includes the water contact angle panel (2f) alongside optical, water-uptake, and biodegradation visuals.
Figure 2f — Water contact angle image used to report wettability
What it shows
This panel shows the sessile droplet on the film surface with tangent construction and labels the reported WCA = 72.6°.
Why It Matters
In the context of developing soyhull cellulosic residue-based biodegradable films for post-harvest raspberry packaging, the paper uses water contact angle as a direct, quantitative descriptor of the optimized film’s surface wettability/hydrophobicity.
The Dropometer-based WCA result is integrated into the study’s broader characterization set (mechanical, barrier, optical, and shelf-life outcomes) to describe the optimized film’s surface interaction with water.
Practical Takeaways
Sessile-drop WCA workflow
The paper’s Dropometer workflow is described as mounting the film, placing a water droplet, capturing a smartphone image, and calculating WCA using sessile drop software.
Reported wettability value
The optimized SCR film is reported with a water contact angle of 72.6°.
Interpretation threshold used
The authors use a 90° cutoff to classify surfaces as hydrophilic (below 90°) or hydrophobic (above 90°).
Figure-ready WCA visual
The contact-angle result is presented as a droplet image with tangent construction in Fig. 2f, aligned with the numeric WCA value.
Contextual comparison provided
The discussion references a low-density polyethylene film WCA value (98.6°) as a hydrophobic comparator when discussing the optimized SCR film’s WCA.