Introduction

Commonly known as "desert ginseng", Cistanche deserticola is a rare parasitic herb thriving in the arid desert regions of Northwest China, including Xinjiang, Inner Mongolia and Gansu provinces. For thousands of years, this unique desert plant has occupied a vital position in traditional Chinese herbal medicine. Historical herbal records document its therapeutic benefits for tonifying kidney‑essence, relaxing intestines to relieve constipation and delaying aging‑related physical decline. In recent decades, advances in modern food science and nutritional research have unlocked the bioactive compounds hidden within Cistanche deserticola, drawing extensive global attention from nutritionists, food developers and natural‑product researchers.

Among diverse bioactive ingredients from Cistanche deserticola, polysaccharides stand out as one of the most functionally valuable substances. As high‑molecular‑weight macromolecules built by monosaccharide units linked through glycosidic bonds, cistanche polysaccharides feature complex molecular architectures, including linear, branched and cyclic structural forms. Their molecular weight normally ranges from tens of thousands Daltons to several million Daltons. Glucose, galactose and mannose constitute the primary monosaccharide building blocks of these polysaccharide molecules. Variations in sugar‑unit combinations and chain arrangements create distinctive physicochemical traits and biological behaviors for cistanche polysaccharides, laying solid foundations for multiple health‑supporting functions.

Apart from polysaccharide fractions, Cistanche deserticola delivers a complete spectrum of nourishing nutrients. It contains all eight essential amino acids required for human physiological operation, supporting tissue repair and normal growth. Abundant unsaturated fatty acids such as linoleic acid and linolenic acid assist in lipid regulation and cardiovascular wellness. Trace minerals including zinc, selenium and copper modulate immune responses and participate in bodily antioxidant defense systems. Besides nutritional components, secondary metabolites such as polyphenols, flavonoids and alkaloids further enhance the plant's antioxidant capacity, helping neutralize reactive free radicals and suppress lipid peroxidation damage inside living organisms.

The real‑world functional performance of these valuable bioactive substances heavily hinges on extraction processes. Appropriate extraction techniques maximize the yield of target polysaccharides while preserving their native bioactivity. Currently mainstream extraction approaches for plant‑derived active substances cover hot‑water extraction, enzymatic extraction, ultrasonic‑assisted extraction, microwave‑assisted extraction and supercritical fluid extraction. Each technical solution carries distinct strengths and inherent drawbacks. Hot‑water extraction features simple workflows and low production costs yet delivers relatively low extraction efficiency and co‑extracts large quantities of impurities. Enzymatic hydrolysis breaks down plant cell walls using biocatalysts, but its effectiveness varies across different polysaccharide subtypes. Ultrasonic‑assisted extraction leverages physical cavitation effects to accelerate substance dissolution, achieving high yields within short processing durations, despite higher equipment investment. Supercritical‑fluid extraction minimizes solvent residues yet demands sophisticated high‑pressure operating infrastructure.

This article translates laboratory research findings on Cistanche deserticola polysaccharide extraction into accessible public‑oriented science content. It compares three practical extraction workflows: water extraction, enzymatic extraction and ultrasonic‑assisted extraction. It explains how processing parameters such as solid‑liquid ratio, ultrasonic duration and extraction temperature shape polysaccharide recovery rates. It also interprets measured antioxidant performance of purified cistanche polysaccharides via DPPH and ABTS radical‑scavenging assays. Readers will gain clear comprehension regarding what cistanche polysaccharides are, how different manufacturing methods influence final product quality, and what antioxidant potential these desert‑plant molecules hold for human wellness. This knowledge offers practical references for food‑formulation developers, supplement designers and natural‑herb enthusiasts exploring applications of Cistanche deserticola in modern functional‑food markets.

What Are Cistanche Deserticola Polysaccharides and Antioxidant Compounds?

Core Biological Traits of Cistanche‑Derived Polysaccharides

Polysaccharides represent polymeric carbohydrate molecules assembled when numerous monosaccharide monomers connect via glycosidic linkages. In Cistanche deserticola, polysaccharides exist as major water‑soluble bioactive constituents stored inside herb tissues. Their molecular weight spans a broad spectrum from tens of thousands up to millions of Daltons. Different branching patterns and monosaccharide compositions directly determine solubility, viscosity and biological behaviors of isolated polysaccharide samples. Glucose, galactose and mannose serve as predominant sugar residues within cistanche polysaccharide chains. Minor sugar components can also appear depending on plant‑growing environments and harvesting seasons.

Many plant polysaccharides exhibit immunomodulation, oxidation resistance and gastrointestinal regulatory effects. Nevertheless, raw Cistanche deserticola plant material locks most polysaccharide molecules behind rigid plant cell walls built from cellulose and pectin. Without proper extraction treatment, these macromolecules cannot be fully released into aqueous solutions for subsequent utilization. That explains why extraction‑process optimization turns into a critical prerequisite for tapping into polysaccharide bioactivity. Suboptimal processing conditions can cause polysaccharide degradation, molecular‑chain fragmentation or incomplete dissolution, drastically weakening functional outcomes of finished extracts.

Other Antioxidant‑Active Substances Inside Cistanche Deserticola

Polysaccharides are not the sole antioxidant‑relevant compounds in desert cistanche. Multiple secondary metabolite groups jointly contribute to its overall free‑radical‑neutralizing capacity. Polyphenol compounds including catechin and gallic acid carry multiple phenolic hydroxyl groups capable of capturing free radicals and chelating transition metal ions that initiate oxidative chain reactions. Flavonoid molecules such as quercetin and kaempferol suppress lipid peroxidation, modulate immune responses and assist blood‑lipid management. Alkaloid compounds like betaine and cistanche alkaloid add extra protective effects against oxidative cellular injury.

It is worth noting that these antioxidant compounds frequently occur in bound forms within native plant tissues. Hydrolytic treatment is required to liberate free‑state molecules. Synergistic or antagonistic interactions may happen between different compound categories. As a result, total antioxidant performance of cistanche extracts reflects combined contributions of polysaccharides, polyphenols, flavonoids and alkaloids, rather than effects from one single substance. Extraction technology shapes both yield ratios and molecular integrity of every compound class, ultimately deciding antioxidant potency of final extracts. Therefore evaluating extraction outcomes should combine quantitative yield testing together with biological‑activity measurement, instead of only tracking substance mass recovery numbers.

Overview of Three Typical Polysaccharide Extraction Methods for Cistanche Deserticola

Researchers compared hot‑water extraction, compound‑enzyme‑assisted extraction and ultrasonic‑assisted extraction using standardized dried Cistanche deserticola tuber samples. All raw materials came from commercially supplied dried cistanche tubers. Sample preparation followed unified protocols: surface washing with ultrapure water, low‑temperature drying at 40 °C, slicing into thin 0.3 mm pieces, mechanical grinding and screening through 100‑mesh sieves to obtain fine uniform powder. Post‑extraction downstream workflows including rotary‑evaporator concentration, ethanol precipitation, centrifugation and freeze‑drying remained identical for all three groups. Differences in final polysaccharide extraction rates purely originated from variations in primary‑extraction stages.

Hot‑Water Extraction

Hot‑water extraction stands as a traditional, widely adopted plant‑active‑substance separation technique. The operational procedure for cistanche polysaccharide extraction worked as follows: 5.0 g of cistanche powder was mixed with 500 mL distilled water inside a beaker. The mixture received water‑bath heating for two hours. Manual stirring was performed every 100 minutes to agitate bottom sediments and boost contact between powder particles and water solvent. After heating completion, liquid mixtures cooled to ambient temperature, then underwent centrifugation at 4000 rpm for 10 minutes. Collected supernatant liquid was concentrated under reduced pressure at 40 °C using rotary evaporation until liquid volume shrank to approximately 20 mL. Ninety‑five percent ethanol was added to trigger polysaccharide precipitation. After overnight static settlement, precipitates were collected through centrifugation and freeze‑dried to acquire crude polysaccharide powder samples.

Hot‑water extraction delivers prominent practical merits. It avoids expensive reagents and sophisticated equipment, supports large‑batch industrial‑scale production, and generates minimal chemical‑solvent pollution. However, its drawbacks are equally obvious. Certain cistanche polysaccharide fractions show limited water solubility, so they cannot fully dissolve into hot aqueous solvent. Long‑duration thermal exposure may partially degrade thermally sensitive polysaccharide chains. Moreover, hot water dissolves many water‑soluble impurity substances alongside target polysaccharides, increasing purification burdens in subsequent processing steps. Experimental measurement demonstrated that hot‑water extraction produced the lowest polysaccharide yield among the three tested approaches.

Enzymatic‑Assisted Extraction

Enzymatic‑assisted extraction employs compound biocatalysts to disintegrate plant‑cell‑wall structural components. In this trial, mixed cellulose‑pectinase composite enzyme solution served as reaction medium, with pH adjusted to 5.0. Five grams of cistanche powder dispersed within enzyme solution reacted under constant‑temperature water bath conditions at 45 °C for five hours. Once enzymatic hydrolysis finished, sample liquid was immediately treated at 100 °C for 10 minutes to deactivate enzyme activity and terminate catalytic reactions. After cooling down, samples were centrifuged to harvest supernatant. The supernatant went through vacuum concentration, ethanol precipitation, centrifugation and freeze‑drying sequences identical to water‑extraction workflows to obtain crude polysaccharide powder.

Cellulase breaks cellulose microfibrils constituting plant cell walls; pectinase decomposes pectin intercellular‑cement substances. After cell‑wall structures break down, intracellular polysaccharide ingredients are released more easily into surrounding solvent. Compared with simple hot‑water soaking, enzymatic processing can improve extraction efficiency under relatively mild thermal circumstances, lessening thermal degradation risks. Even so, this technology still presents noticeable limitations. Composite enzyme formulations target cellulose and pectin primarily. They cannot efficiently break down other macromolecular barriers relevant to some polysaccharide subtypes. Enzyme activity is extremely sensitive toward pH value, reaction temperature and substrate concentration. Minor parameter deviations can sharply reduce overall extraction performance. Enzyme‑agent procurement also raises raw‑material costs for mass manufacturing. Test data indicated enzymatic extraction achieved higher polysaccharide recovery than hot‑water extraction yet still lagged behind ultrasonic‑assisted technology.

Ultrasonic‑Assisted Extraction

Ultrasonic‑assisted extraction belongs to physical‑field‑enhanced separation technology. High‑frequency ultrasonic energy generates cavitation phenomena inside liquid solvent. Tiny vacuum bubbles form, expand and collapse violently, producing localized high‑temperature high‑pressure micro‑zones, powerful shock waves and microjet flows. These physical forces smash plant‑cell‑wall structures, create micro‑fractures on powder‑particle surfaces, accelerate mass‑transfer processes and speed up dissolution of intracellular bioactive compounds into solvent systems. This technology shortens extraction durations and elevates substance‑release efficiency compared with conventional heating‑soaking workflows.

In laboratory operations, 5.0 g cistanche powder mixed with 500 mL distilled water was placed inside ultrasonic extraction equipment. Instrument parameters were set to 350 W power and 40 kHz ultrasonic frequency. After ultrasonic treatment finished, mixed liquids cooled to room temperature and received centrifugation at 4000 rpm lasting 10 minutes. Supernatant fractions were concentrated via rotary evaporation, precipitated with 95 % ethanol, settled overnight, centrifuged once more and freeze‑dried to obtain crude polysaccharide extracts. Comparative testing outcomes proved ultrasonic‑assisted extraction delivered the highest polysaccharide yield among the three evaluated technical routes, reaching (7.27 ± 0.04) % under preliminary test conditions. Physical cavitation effects strengthened contact frequency and contact area between water solvent and cistanche powder particles, effectively promoting polysaccharide dissolution. Nevertheless, ultrasonic energy may damage partial thermolabile molecules if temperature and processing time are poorly controlled. Ultrasonic extraction devices also carry higher capital expenditure relative to basic water‑bath apparatus.

Single‑Factor Experimental Analysis of Ultrasonic‑Assisted Extraction Parameters

Since ultrasonic‑assisted extraction exhibited superior polysaccharide‑yield performance, researchers further optimized its operating conditions. Single‑factor experiments investigated influences exerted by solid‑liquid ratio, ultrasonic extraction duration and ultrasonic extraction temperature on polysaccharide recovery rates. A glucose standard curve was built utilizing phenol‑sulfuric‑acid colorimetric methodology for polysaccharide quantification. Regression equation for the standard curve read y = 9.6959x + 0.0077, with coefficient of determination R² = 0.999, showing excellent linear fitting reliability for quantitative‑analysis purposes.

Calculation formula for cistanche polysaccharide extraction rate is shown below:

Polysaccharide extraction rate (%) = (C × V × n / M) × 100 %

Where C represents measured polysaccharide concentration (g/mL); V represents sample‑solution volume; n stands for dilution multiple; M stands for mass of raw cistanche powder sample in grams.

Effect of Solid‑Liquid Ratio on Polysaccharide Extraction Yield

Solid‑liquid ratio describes the mass‑to‑volume proportion between solid cistanche powder and distilled‑water solvent. Experimental gradient settings covered 1:400, 1:200, 1:100, 1:50 and 1:20. A ratio of 1:100 means 5.0 g cistanche powder corresponds to 500 mL distilled water solvent. When solvent proportion increases, concentration gradients between intracellular polysaccharide molecules and external solution expand, which theoretically facilitates diffusion‑driven substance dissolution. However, excessive solvent volume dilutes target‑substance concentration, enlarges subsequent concentration workloads and raises energy consumption for industrial‑scale production. Insufficient solvent volume cannot fully immerse powder particles, limiting polysaccharide dissolution space.

Experimental data demonstrated that polysaccharide extraction yield first climbed and then declined as solid‑liquid‑ratio values changed. The extraction rate peaked at 7.46 % under the 1:100 solid‑liquid‑ratio condition. If solvent volume kept rising beyond this point, extraction efficiency stopped growing and gradually decreased. This observation can be interpreted: adequate solvent supplies guarantee full polysaccharide dissolution, yet further solvent additions no longer improve mass‑transfer efficiency. Excess water may even amplify co‑dissolution of impurity components and interfere with polysaccharide‑detecting measurements. Hence single‑factor‑test outcomes selected solid‑liquid ratio of 1:100 as the preferred baseline parameter for follow‑up response‑surface experimental design.

Effect of Ultrasonic Extraction Time on Polysaccharide Extraction Yield

Ultrasonic processing duration determines cumulative physical cavitation energy delivered to cistanche powder particles. Tested time gradients were set as 10 min, 20 min, 30 min, 40 min and 50 min. Within relatively short‑time intervals, extending ultrasonic duration increased cell‑wall‑damage degrees step‑by‑step, releasing more polysaccharide molecules out of plant‑tissue fragments. Test results illustrated that polysaccharide extraction rate rose rapidly from 10 min toward 30 min. After exceeding 30 minutes, yield‑growth tendencies flattened out and only marginal increases occurred. Once plant‑cell‑wall disruption reaches saturation, prolonging ultrasonic treatment cannot liberate extra polysaccharide content. On the contrary, overly lengthy ultrasonic exposure may generate excessive local thermal effects, triggering partial degradation of polysaccharide macromolecular chains. Considering both extraction efficiency and energy‑cost economy, single‑factor experiments preliminarily chose 30 minutes as the favorable ultrasonic‑time reference value for subsequent multi‑factor optimization work.

Effect of Ultrasonic Extraction Temperature on Polysaccharide Extraction Yield

Temperature simultaneously affects solvent molecular‑motion vigor, polysaccharide water‑solubility and thermal‑stability properties of target macromolecules. Experimental temperature gradients included 37 °C, 43 °C, 48 °C, 53 °C and 60 °C. Within moderate‑temperature ranges, higher temperature accelerates molecular diffusion rates and improves polysaccharide solubility in aqueous solvent. Test data showed extraction yield kept increasing as temperature climbed up to 53 °C. Once temperature surpassed 55 °C, polysaccharide extraction rate dropped sharply. High‑temperature environments break glycosidic bonds inside polysaccharide macromolecules, triggering molecular‑chain cleavage and substance degradation, which lowers measurable polysaccharide content in final extracts. Therefore single‑factor testing recommended 53 °C as the preliminary optimal‑temperature candidate for response‑surface design iterations.

Response‑Surface Methodology for Multi‑Factor Extraction‑Process Optimization

Single‑factor experiments only evaluate influences from individual variables in isolation. In real‑world extraction operations, solid‑liquid ratio, ultrasonic duration and extraction temperature interact mutually. Response‑surface methodology based upon Box‑Behnken experimental design was applied to explore interaction effects among these three variables and locate globally optimal parameter combinations. Polysaccharide extraction percentage served as the quantitative response value for modeling calculations.

Quadratic multiple‑regression equation obtained from experimental fitting reads:

Y = 7.120 − 0.065A + 0.280B − 0.210C + 0.390AB + 0.04AC + 0.072BC − 0.190A² − 0.860B² − 0.075C²

Where variable A represents solid‑liquid ratio; variable B represents ultrasonic extraction time; variable C represents ultrasonic extraction temperature; Y stands for predicted polysaccharide extraction rate (%). Analysis‑of‑variance results revealed that regression‑model P‑value equaled 0.0003, reaching extremely significant statistical level. The lack‑of‑fit term obtained P‑value of 0.0592, showing no statistical significance. Adjusted coefficient of determination R² = 0.9232 indicated that over 92 % of variation in polysaccharide‑extraction‑rate data could be explained by this mathematical model. The model delivered reliable fitting performance for experimental data and could be used for parameter‑prediction purposes.

Analysis of factor significance displayed that ultrasonic extraction time (factor B) exerted extremely significant influence on polysaccharide yield (P = 0.0035). Ultrasonic extraction temperature (factor C) brought significant impacts (P = 0.0256). Solid‑liquid ratio (factor A) showed non‑significant statistical effect (P = 0.3938). Interaction term AB between solid‑liquid ratio and ultrasonic time reached extremely‑significant level, while AC and BC interaction terms demonstrated non‑significant differences. Sorting factor influence intensity from strong to weak: ultrasonic extraction time > ultrasonic extraction temperature > solid‑liquid ratio.

According to model‑calculated predictions plus practical experimental verification, the optimal technical combination for ultrasonic‑assisted polysaccharide extraction from Cistanche deserticola is solid‑liquid ratio 1:100 (5.0 g cistanche powder mixed with 500 mL distilled water), ultrasonic extraction duration 40 minutes, extraction temperature 48 °C. Under these concrete operating conditions, actual measured polysaccharide extraction rate hit 7.49 %. This set of balanced parameters reconciles three‑factor interactive relationships. It avoids polysaccharide thermal degradation caused by excessive temperature, makes full use of ultrasonic cavitation energy via reasonable processing duration, and prevents solvent waste from overly‑dilute solid‑liquid ratios. This optimized parameter group provides actionable reference for laboratory preparation and pilot‑scale production of cistanche polysaccharide raw materials.

Antioxidant‑Activity Evaluation of Optimally‑Extracted Cistanche Deserticola Polysaccharides

High polysaccharide‑extraction yield alone cannot guarantee functional quality of extracts. Bioactivity assessment represents an indispensable evaluation step. This research adopted two classic in‑vitro free‑radical‑scavenging test systems: DPPH radical‑scavenging assay and ABTS radical‑scavenging assay. Vitamin C (ascorbic acid, VC) was selected as positive‑control reference substance for comparison of relative antioxidant capacity. Gradient concentrations of cistanche polysaccharide test solutions were configured: 0.1 mg/mL, 0.2 mg/mL, 0.3 mg/mL, 0.4 mg/mL, 0.5 mg/mL, 0.6 mg/mL and 0.7 mg/mL, to carry out antioxidant‑performance measurement work.

DPPH Radical‑Scavenging Capacity Testing Principle and Outcomes

DPPH is a stable synthetic free radical displaying deep‑purple color in ethanol solutions. When antioxidant molecules supply hydrogen atoms to neutralize DPPH free radicals, purple color fades, and absorbance‑value reduction can be detected via ultraviolet‑visible spectrophotometry at 517 nm wavelength. Calculation formula for DPPH radical‑scavenging rate:

DPPH radical‑scavenging rate (%) = [A₀ − (Aᵢ − Aⱼ)] / A₀ × 100 %

A₀: absorbance of blank control group; Aᵢ: absorbance of sample reaction group; Aⱼ: absorbance for sample background correction group.

Test results showed that polysaccharide samples obtained under optimized ultrasonic‑extraction conditions achieved DPPH radical‑scavenging capacity equivalent to 84.27 % of VC's antioxidant performance. This outcome illustrates cistanche polysaccharides possess powerful capability to eliminate DPPH free radicals. Polysaccharide molecular structures contain multiple hydroxyl groups that can donate hydrogen protons to stabilize free‑radical molecules and terminate oxidative chain reactions. It should be noted that VC belongs to small‑molecule fast‑acting antioxidant, while cistanche polysaccharides are large‑molecule substances. Their molecular‑action mechanisms differ fundamentally. Even though absolute activity does not completely reach VC standards, polysaccharides exhibit unique advantages such as good water solubility, biological compatibility and potential multi‑target physiological regulatory effects inside living bodies.

ABTS Radical‑Scavenging Capacity Testing Principle and Outcomes

The ABTS assay generates blue‑green ABTS⁺ free‑radical cations through oxidation reactions. Antioxidant substances can reduce these colored free‑radical cations and decolorize reaction systems. Detect absorbance variations at 752 nm wavelength to quantify radical‑inhibiting effects. Calculation formula for ABTS radical‑scavenging rate:

ABTS radical‑scavenging rate (%) = [A₀ − (Aᵢ − Aⱼ)] / A₀ × 100 %

A₀, Aᵢ and Aⱼ correspond to blank‑control absorbance, sample‑group absorbance and background‑correction absorbance respectively.

Measured data demonstrated that ABTS radical‑scavenging activity of optimized cistanche polysaccharide extracts reached 73.95 % relative to VC reference. DPPH and ABTS testing systems react toward different free‑radical types. DPPH test mainly reflects lipid‑soluble‑system antioxidant performance, while ABTS assay adapts to both aqueous and organic‑solvent environments. Consistent positive results from two independent test systems jointly verify that cistanche polysaccharides deliver reliable broad‑spectrum in‑vitro antioxidant potential. Such antioxidant capacity originates from polysaccharide molecular hydroxyl groups, and may also receive contributions from residual co‑extracted polyphenol and flavonoid impurities within crude polysaccharide samples. For finished functional‑food or dietary‑supplement development, further purification work can be implemented according to product‑positioning requirements to raise polysaccharide purity or retain synergistic auxiliary‑active ingredients appropriately.

Practical Insights for Food‑Industry Applications of Cistanche Deserticola Polysaccharides

Reference Significance of Extraction‑Process Research for Product Development

This comparative study of three extraction technologies delivers clear practical guidance for enterprises developing cistanche‑related functional‑food raw materials. Hot‑water extraction fits low‑cost large‑volume production scenarios where high polysaccharide purity is not mandatory, for instance herbal‑tea raw‑material processing. Enzymatic‑assisted extraction applies to situations requiring mild thermal conditions, yet enterprises must carefully control enzyme quality, pH and temperature parameters to avoid unstable batch‑to‑batch outcomes. Ultrasonic‑assisted extraction achieves higher polysaccharide yields within shorter processing cycles. After adopting the optimized parameters (solid‑liquid ratio 1:100, ultrasonic time 40 min, temperature 48 °C), manufacturers can obtain crude polysaccharide extracts with 7.49 % extraction rate and favorable antioxidant activity. Industrial‑scale ultrasonic equipment needs to resolve challenges such as uniform ultrasonic‑energy distribution across large‑volume reaction vessels and precise temperature‑control systems to prevent local overheating and polysaccharide degradation.

Functional‑Product Development Directions

Given the verified in‑vitro antioxidant properties of cistanche polysaccharides, multiple product‑development avenues are open for food‑formulation designers. Polysaccharide powder can serve as functional additive for compound beverages, solid‑drink formulations, granule supplements and health‑care food premixes. It can be compounded with other plant‑derived antioxidant raw materials to create synergistic‑effect formulas. It is critical to remind readers that in‑vitro free‑radical‑scavenging experimental results cannot be directly equated with human‑body therapeutic effects. In‑vitro lab data only prove molecular‑level antioxidant potential. Actual physiological benefits inside human organisms depend on digestive‑tract absorption, metabolic transformation and in‑vivo biological‑response processes. Consumers should not treat cistanche polysaccharide extracts as replacement for pharmaceutical medications. Relevant health‑food product claims must comply with local regulatory requirements in target sales markets.

Existing Limitations and Future‑Research Perspectives

This research focuses on crude polysaccharide extracts from Cistanche deserticola. Crude polysaccharide powder contains mixed polysaccharide subgroups plus trace polyphenol, flavonoid impurities. Further separation and fractionation work is required to isolate single homogeneous polysaccharide components and clarify structure‑activity relationships between specific molecular structures and antioxidant behaviors. Present‑day antioxidant evaluation stays confined to in‑vitro test systems. Follow‑up animal‑model experiments and human‑clinical investigations are needed to confirm in‑vivo antioxidant and physiological‑regulating effects. In addition, how drying technologies, storage temperature and humidity influence stability of cistanche polysaccharide products also constitutes an important subject for product‑development teams. When independent‑site merchants launch cistanche‑polysaccharide‑related products, content publicity should stick to science‑based descriptions, avoid exaggerated medical‑effect assertions, and fully inform customers about current research boundaries of this desert‑plant active substance.

Conclusion

Cistanche deserticola, the well‑known "desert ginseng", accumulates abundant polysaccharide bioactive ingredients within its tuber tissues. Polysaccharides represent core functional substances supporting its antioxidant‑relevant properties. Comparing hot‑water extraction, enzymatic extraction and ultrasonic‑assisted extraction workflows, ultrasonic‑assisted extraction delivers superior polysaccharide‑recovery performance. Through single‑factor screening combined with Box‑Behnken response‑surface optimization methodology, the optimal technical parameters are confirmed as solid‑liquid ratio 1:100, ultrasonic extraction duration 40 minutes, extraction temperature 48 °C. Under these conditions, polysaccharide extraction rate achieves 7.49 %. The acquired polysaccharide extracts show prominent in‑vitro free‑radical‑eliminating capacity: DPPH radical‑scavenging ability reaches 84.27 % of vitamin‑C activity, while ABTS radical‑scavenging performance attains 73.95 % of vitamin‑C activity, demonstrating dependable antioxidant potential.

Factor‑influence‑strength ranking shows ultrasonic extraction time imposes the strongest impact on polysaccharide yield, followed by extraction temperature; solid‑liquid ratio exhibits comparatively weaker statistical influence. These experimental conclusions supply process‑parameter references for laboratory preparation and industrial pilot‑production of cistanche polysaccharide raw materials. Meanwhile, this article reminds industry practitioners and consumers that in‑vitro antioxidant test results cannot directly translate into curative medical claims. Further animal experiments and human clinical studies remain necessary to validate in‑vivo physiological effects. As research on desert‑plant bioactive substances keeps advancing, Cistanche deserticola polysaccharides will gain broader application prospects within functional‑food, nutritional‑supplement and natural‑health‑product markets across the globe.