Investigating aquaphotomics for fruit quality assessment
type: CreativeWork
description: The methods of aquaphotomics were explored for internal fruit quality assessment, such as dry matter (DM) and soluble solid content (SSC) measurement using near infrared spectroscopy (NIRS). Fruits like apple and kiwifruit are more than 80% water. The NIR spectrum of whole intact fruit is dominated by water absorption peaks that shift and vary in shape with changes in quantities such as SSC, DM, and temperature. These variations can significantly reduce predictive model performance for fruit quality parameters. Because the absorption peak at 1450 nm (first overtone of the OH stretch of water) and 970 nm (second overtone of the OH stretch of water) in the samples varies with SSC, DM concentration, and temperature, an investigation was undertaken on the aquaphotomics approach to quantify changes in the water structure that are apparent in the two wavelength regions. The key question examined was whether aquaphotomics can help in the development of better and simpler prediction models or hardware for intact fruit quality measurements beneficial to the industry. To find answers to this question, several experiments were conducted. Much work in aquaphotomics has been done in the longer wavelength region, that is, at the first overtone (1300–1600 nm), which requires short pathlength cells due to higher water absorption. Experiments were performed on simple aqueous systems such as sucrose solution of various concentrations and an aqueous system such as apple and kiwifruit juice. The second overtone wavelength region (800‒1100 nm) was also scrutinized for fruit juice measurements using a long pathlength cell. Eventually, experiments were conducted on whole intact fruit. A Fourier transform near infrared (FT-NIR) spectrophotometer was used to acquire spectra of aqueous samples over the wavelength range of 900 to 1800 nm. For whole, intact fruit spectra collection, spectrophotometers in the wavelength range below 1100 nm were utilized. An in-house benchtop spectrometer based …
abstract: The methods of aquaphotomics were explored for internal fruit quality assessment, such as dry matter (DM) and soluble solid content (SSC) measurement using near infrared spectroscopy (NIRS). Fruits like apple and kiwifruit are more than 80% water. The NIR spectrum of whole intact fruit is dominated by water absorption peaks that shift and vary in shape with changes in quantities such as SSC, DM, and temperature. These variations can significantly reduce predictive model performance for fruit quality parameters. Because the absorption peak at 1450 nm (first overtone of the OH stretch of water) and 970 nm (second overtone of the OH stretch of water) in the samples varies with SSC, DM concentration, and temperature, an investigation was undertaken on the aquaphotomics approach to quantify changes in the water structure that are apparent in the two wavelength regions. The key question examined was whether aquaphotomics can help in the development of better and simpler prediction models or hardware for intact fruit quality measurements beneficial to the industry. To find answers to this question, several experiments were conducted. Much work in aquaphotomics has been done in the longer wavelength region, that is, at the first overtone (1300–1600 nm), which requires short pathlength cells due to higher water absorption. Experiments were performed on simple aqueous systems such as sucrose solution of various concentrations and an aqueous system such as apple and kiwifruit juice. The second overtone wavelength region (800‒1100 nm) was also scrutinized for fruit juice measurements using a long pathlength cell. Eventually, experiments were conducted on whole intact fruit. A Fourier transform near infrared (FT-NIR) spectrophotometer was used to acquire spectra of aqueous samples over the wavelength range of 900 to 1800 nm. For whole, intact fruit spectra collection, spectrophotometers in the wavelength range below 1100 nm were utilized. An in-house benchtop spectrometer based …
author: Kaur, Harpreet
keywords: Fruit quality, Aquaphotomics, optical sensors, Near infrared spectroscopy
license: https://researchcommons.waikato.ac.nz/bitstreams/d126f801-76e4-4aa1-b0ea-d19c955f5d63/download
date published: 2020
date modified: 2026-07-24T05:57:24Z
provider: University Waikato
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: The University of Waikato