Evaluation of Proximate Composition, Antioxidant Properties, and Phylogenetic Analysis of Two Edible Seaweeds

Innovative strategies for protein content determination in dried laver (Porphyra spp.): Evaluation of preprocessing methods and machine learning algorithms through short-wave infrared imaging

In this study, we explored the application of Short-Wave Infrared (SWIR) hyperspectral imaging combined with Competitive Adaptive Reweighted Sampling (CARS) and advanced regression models for the non-destructive assessment of protein content in dried laver. Utilizing a spectral range of 900-1700 nm, we aimed to refine the quality control process by selecting informative wavelengths through CARS and applying various preprocessing techniques (standard normal variate [SNV], Savitzky-Golay filtering [SG], Orthogonal Signal Correction [OSC], and StandardScaler [SS]) to enhance the model's accuracy. The SNV-OSC-StandardScaler- Support vector regression (SVR) model trained on CARS-selected wavelengths significantly outperformed the other configurations, achieving a prediction determination coefficient (Rp2) of 0.9673, root mean square error of prediction of 0.4043, and residual predictive deviation of 5.533. These results highlight SWIR hyperspectral imaging's potential as a rapid and precise tool for assessing dried laver quality, aiding food industry quality control and dried laver market growth.

Physicochemical, thermal, and functional properties of edible red algae (Gracilaria corticata)

In the present research, physicochemical, functional, and antioxidant properties of Gracilaria corticata (GC) powder were evaluated. The seaweed was found rich in protein (21%) carbohydrate (53.03%) and fat (7.8%). The inductively coupled plasma-optical emission spectrometry showed among the mineral's calcium (13.987 mg/g) and magnesium (7.48 mg/g) were found to be in higher percent. Three transition peaks were observed as the samples were subjected to DSC (-5.27°C for fat, 82.25°C for carbohydrates, and 98.79°C for proteins). The CHNS analysis demonstrated sulfur content (2.23%) depicts presence of sulfate polysaccharide confirmed by Fourier transform infrared spectroscopy spectra band at 1235 cm-1. A significant increase in the swelling capacity (14.26-21 mL/g) and water holding capacity (8.21-9.09 g/g) was observed as the temperature was increased from 25 to 80°C. On the contrary, oil holding capacity decreased significantly from 3.98 to 2.11 g/g with an increase in temperature. Nowadays, the sedentary lifestyle leads to chronic disease; however, the antioxidants derived from plants provide the biochemical defense from free radical formation. The marine-derived algal are good sources of nutrition and antioxidants, being natural sources of GC, the antioxidant activity exhibited by total phenolic content and α-diphenyl-β-picrylhydrazyl were found to be (11 mg GAE/g and 18%) inhibition, respectively. The principal phytochemicals profile was quantified by liquid chromatography-mass spectrometry as catechin, coumaric acid, phloroglucinol, and luteolin.