# Comparing Sodium Redistribution, Cooking Performance, Texture, and Sensory Properties of Guar Gum and Semperfresh Salt-Coated Noodles

## TL;DR

This study shows how salt coatings using guar gum or Semperfresh improve noodle quality by controlling sodium distribution and enhancing texture and cooking performance.

## Contribution

The first visualization of sodium distribution using stained NaCl to demonstrate how coatings affect ion mobility and protein-starch interactions in noodles.

## Key findings

- Salt coatings increased sodium retention by 129–134% and improved controlled redistribution during cooking.
- Coated noodles showed enhanced texture, reduced cooking loss, and a more compact gluten–starch network.
- Microstructural analysis revealed a denser protein matrix and improved sensory scores in coated noodles.

## Abstract

This study evaluated the effects of novel salt coating
strategies
on the functional and structural properties of the yellow alkaline
noodles. Noodles were coated by immersion in 0.15% guar gum or 5%
Semperfresh solutions containing 10% NaCl to produce salt-coated noodles.
The coatings enhanced Na retention (129–134%) and promoted
controlled sodium redistribution during cooking compared with commercial
noodles. Improvements included increased lightness, reduced cooking
time, lower cooking loss, and a more compact gluten–starch
network that limited starch leaching. Microstructural analysis revealed
a denser, honeycomb-like protein matrix encapsulating starch granules,
while textural measurements showed higher tensile strength, elasticity,
hardness, and springiness, consistent with improved sensory scores.
For the first time, Na distribution was visualized using stained NaCl,
demonstrating how coating matrices modulate ion mobility and reinforce
protein–starch interactions. These findings provide mechanistic
insights into how salt coatings affect noodle structure and functionality,
offering a practical strategy to enhance quality and support the WHO-recommended
reduction in sodium intake in foods.