94 FORMULATING FOR MILDNESS 2% SLS


2% SLS + 2% maltooligosyl glucoside liquid


1 hour after patch removal


2% SLS + 5% maltooligosyl glucoside liquid


Protein denaturation


24 hours after patch removal


100 90 80 70 60 50 40 30 20 10 0


Control **


Maltooligosyl glucoside liquid


Figure 3: Protective effect against surfactant-induced skin roughness (image from one subject)


improve foam quality, delivering dual benefits: protection against surfactant- and friction- induced damage, and enhancement of the overall sensory experience during washing.


Optimization of post-rinse feel Along with the texture during washing, the post-rinse feel is a critical factor in delivering a superior cleansing experience. To assess its impact on post-rinse sensation, a human study was conducted in which two types of skin cleansers- one containing 5% maltooligosyl glucoside liquid and one without-were applied to opposite forearms of each subject at separate times on the same day.8 Each cleanser was diluted tenfold with water


to generate foam. The foam was applied to the entire right or left forearm of 26 Japanese female subjects, then rinsed off with 1.5 litres of water, and any remaining water was lightly wiped away. Sensory evaluation using a seven-point scale was performed five minutes after rinse-off, and the score difference between the two formulations


Average foam bubble size 200000


150000 100000 50000 0 Control


Maltooligosyl glucoside liquid


Control


Maltooligosyl glucoside liquid


Immediately after foaming 30 minutes after foaming


Figure 5: Effect of maintaining fine bubbles ** p<0.01 vs. Control in Unpaired t-test


PERSONAL CARE MAGAZINE April 2026


Figure 6: Effect of maintaining fine bubbles (image captured by a dynamic foam analyser)


www.personalcaremagazine.com ** 30 minutes after foaming


Immediately after foaming


was calculated. Subsequently, the stratum corneum from the


tested area was collected by tape-stripping to measure the amount of maltooligosyl glucoside. Its residual amount on the skin was determined by subtracting the control value for the cleanser without maltooligosyl glucoside liquid, from the other value for the cleanser with maltooligosyl glucoside liquid. As a result, the oligosaccharide was detected on the skin after rinsing (Figure 9). Furthermore, its addition tended to enhance the silky feel after rinse-off (Figure 10). These findings indicate that maltooligosyl glucoside liquid remains on the skin after rinsing, and contributes to an improved post- rinse sensory experience.


Conclusion Skin care plays an essential role in overall well-being and quality of life, extending far beyond surface-level appearance. Improving skin condition through appropriate treatment can help alleviate stress caused by skin concerns, while the


Figure 4: Preventive effect against Zein protein denaturation8 t-test


** p<0.01 vs. Control in Unpaired


act of applying skin care products engages the sense of touch and positively influences emotional well-being. Together, these aspects underscore the


importance of achieving both functional efficacy and a satisfying sensory experience. The growing prevalence of sensitive skin,


together with its impact on both physical comfort and psychological well-being, has intensified demand for gentle cleansing products. In addition, a rich foam texture and comfortable after-feel are required to enhance sensory satisfaction, presenting a persistent formulation challenge. This study reveals that maltooligosyl glucoside


liquid represents a promising functional ingredient for addressing this challenge. The in vivo study demonstrates its preventive effect against surfactant-induced skin irritation, highlighting its potential to mitigate sensitive skin symptoms. In addition, this ingredient contributes to favourable sensory attributes, including rich foam quality and silky after-feel. Today’s personal care industry increasingly


Control


Maltooligosyl glucoside liquid


Bubble area (µm2


)


Zein solubility (%)


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