Vitamin C Nitrate Microcapsules for Sustained Radiotherapy Salivary Protection

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Solution Overview

Problem

Vitamin C and nitrates have poor stability and solubility, leading to rapid degradation and difficulty in maintaining effective blood concentration, and there is no effective medication for salivary gland damage caused by radiotherapy, which results in reduced saliva secretion and impaired quality of life for patients.

Innovation Solution

A microcapsule comprising pectin and sodium carboxymethyl cellulose as the wall material and vitamin C and nitrate as the core material, with a molar ratio of 1:1 to 1:5, is prepared through freeze-drying and crushing to encapsulate vitamin C and nitrate, achieving a high embedding rate of 87.2% and sustained release dynamics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If vitamin C and nitrate are administered orally to treat salivary gland damage, then the therapeutic effect is achieved, but the stability of vitamin C deteriorates due to environmental factors such as temperature, pH, oxygen, and radiation

Engineering Contradiction:

Improvetherapeutic effectVSAvoidstability of vitamin C

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The invention divides the therapeutic agent into two separate microcapsules: one containing vitamin C and the other containing nitrate. This segmentation protects vitamin C from degradation by isolating it from harmful environmental factors while maintaining its therapeutic effectiveness when the microcapsules are combined in the body.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The microcapsule structure acts as an intermediary protective layer between vitamin C and the external environment. The wall material of the microcapsule shields vitamin C from temperature, pH, oxygen, and radiation, preventing degradation while allowing controlled release of the therapeutic agents.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If vitamin C and nitrate are administered orally, then the treatment is simple, but the half-life in vivo is only 2 hours making it difficult to maintain effective blood concentration

Engineering Contradiction:

Improveease of oral administrationVSAvoidhalf-life in vivo

Core Design Contradiction:

Ease of operationVSDuration of action of moving object

Solution Approach 1:

The invention performs preliminary encapsulation of vitamin C and nitrate in microcapsules before administration. This pre-preparation protects the drugs during storage and administration, and the microcapsule structure enables sustained release in the body, extending the effective blood concentration duration beyond the natural 2-hour half-life limitation.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If conventional microencapsulation methods are used for water-soluble vitamin C, then the encapsulation process is straightforward, but the encapsulation efficiency is poor and degradation of unstable substance occurs

Engineering Contradiction:

Improveencapsulation processVSAvoidencapsulation efficiency

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The invention changes the wall material parameters by using a specific composition (pectin, sodium carboxymethyl cellulose, and chitosan) with optimized ratios. This parameter change significantly improves encapsulation efficiency for water-soluble vitamin C while protecting it from degradation, overcoming the limitations of conventional methods.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The microcapsule effectively improves salivary flow rate to about 85% of pre-radiotherapy levels and reverses salivary gland damage by maintaining effective nitrate concentration, promoting cell proliferation, and ensuring synergistic effect of vitamin C and nitrate.

Implementation Method 1

uniformly mixing the core material solution prepared in step II and the wall material solution prepared in step III

Methodology Applied

Scientific EffectHomogenization:

Implementation Method 2

freeze-drying

Methodology Applied

Scientific EffectFreezing: Freezing

Implementation Method 3

freeze-drying, and crushing to obtain the microcapsules

Methodology Applied

Scientific EffectFreeze-drying: Freeze Drying

Data Source

PatentUS20250228785A1Microcapsule, preparation method therefor, and use thereof in preventing and/or treating damage to salivary glands caused by radiation therapy

Publication Date: 2025.07.17 CAPITAL UNIVERSITY OF MEDICAL SCIENCES

AI summary

A microcapsule containing vitamin C and nitrate, said capsule comprising a wall material and a core material encapsulated in the wall material. The wall material comprises pectin and sodium carboxymethyl cellulose, and the core material comprises vitamin C, nitrate, and chitosan. The raw materials of the microcapsule comprise, in parts by weight: pectin 0.7-1.2 parts by weight, sodium carboxymethyl cellulose 0.7-1.2 parts by weight, chitosan 1 part by weight, and vitamin C and nitrate in a total amount of 0.3-1.2 parts by weight, the molar ratio of vitamin C to nitrate ions being 1:1-1:5. A use of the microcapsule in the preparation of a drug for preventing and/or treating damage to the salivary glands caused by radiation therapy, in particular a use in the preparation of a drug for preventing and/or treating damage to the salivary glands caused by radiation therapy for nasopharyngeal carcinoma.