The data and findings discussed here come from the cited paper and do not represent test results from VISPEK equipment.
Whether the vitamin C and ellagic acid content of Kakadu plums can be screened first using portable spectroscopy is the starting point of this study. The study compared both whole fruits and purees, but the samples were frozen and thawed. Which form the best model corresponds to and which verification method affects its interpretation in raw material batches.
Summary
In this study, diffuse reflectance spectra were collected from frozen and thawed Kakadu plum whole fruits and purees, and a PLS model was established using the chromatographic content as a reference. Cross-validation of complete results supports screening studies of indicators such as vitamin C, but is not sufficient to promise precise quantification. Whole fruit and puree models cannot be mixed, and sample processing and limited validation scope need to be retained.
(AI-generated conceptual illustration for context; it is not data from the paper, a photograph of the research equipment, or a VISPEK product diagram.)
Why It Matters
Prioritize the identification of raw material batches with large differences in vitamin C content.
Methods and Reference Measurements
Kakadu plums were harvested from ten trees in each place in Australia, stored at low temperature and thawed. 60 samples were first scanned with intact fruits and then with pureed fruits at 950–1600 nm diffuse reflectance. Dimension C and ellagic acid were measured using chromatographic reference, and PLS modeling was performed after second-order derivatives; KS was divided into 40 calibration and 20 validation, and a leave-one-out cross-validation was performed within the calibration.
Wavelengths and Acquisition Parameters
| Band/parameter | Original meaning and usage instructions |
|---|---|
| 950–1600 nm | Original study modeling scope; see Methods and Results for complete wavelength selection. |
Key Findings
The SECV of intact fruit vitamin C=1.81% dry matter, RPD=2.1; the SECV of ellagic acid=3.8 mg/g dry matter, RPD=1.9. Here is the cross-validation error, and the original article positions the method as screening.
Limitations and Interpretation
The original civilization was determined to be in high and low content screening, and RPD was not enough to support precise quantification; whole fruits and fruit purees could not be mixed; the samples were frozen and thawed.
Bands and model boundaries: The model bands used in the study or independently verified are within 250–1700 nm.
Image copyright belongs to the paper’s original authors. License: CC BY 4.0.
Source Paper
Bobasa E, Phan ADT, Netzel M, Smyth HE, Sultanbawa Y, Cozzolino D. (2021). The Use of a Micro Near Infrared Portable Instrument to Predict Bioactive Compounds in a Wild Harvested Fruit-Kakadu Plum (Terminalia ferdinandiana). Sensors (Basel, Switzerland). https://doi.org/10.3390/s21041413
Contact Us
Whether portable equipment can be used for similar detection needs to be evaluated based on samples and experimental conditions, and the specific effect still needs to be verified through actual testing. Welcome to contact VISPEK to exchange your sample and testing needs, jointly evaluate experimental plans, and explore the feasibility of using our company's equipment for actual measurement and verification.
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VISPEK products shown for illustration; these were not the devices used in the cited study.