Paraffin‐based shape‐stabilized composite phase change materials (PCM) containing surface modified cellulose nanocrystals (CNCs) for thermal energy storage applications were prepared. In this respect, a three‐step experimental procedure consisting nanoparticle modification, macroporous foam synthesis, and composite PCM preparation was implemented. While CNCs were modified via freeze‐templating, high internal phase emulsion (HIPE) templating was used for the synthesis of polymeric foams ‐ known as polyHIPEs. Meanwhile a simple method was applied to impregnate n‐hexadecane (HD), which is a paraffin‐based PCM within the polyHIPE foam matrix. It was demonstrated that surface modified CNCs can be efficiently used to prepare polyHIPE foams with improved properties. It was also shown that the impregnation of HD into the ‐polyHIPE foam matrix supported by CTAB‐CNCs can be achieved with an incorporation rate of up to 55.7%. Moreover, the phase transition temperature and thermal energy storage capacity of the obtained composite PCM was determined as 22.7°C and 117 J/g, respectively.
Polyphenols are the secondary metabolites of plants and has an important role in human nutrition as the leading antioxidants. According to the carbon number-based classification of polyphenols, resveratrol is a natural polyphenol in the stilbene group with antioxidant and anticarcinogenic effects. Its beneficial effects on cardiovascular diseases have also been reported. It was first identified in 1940 and has recently gained importance especially in medicine and pharmacy. Researchers have carried out various studies on resveratrol and its time-honored use in traditional eastern medicine has been reported. Resveratrol is a food ingredient that has the potential to be used in the treatment of various diseases, but also has antiviral effects. The study focuses on resveratrol’s physical and chemical properties, effects on health, antiviral effects and use in foods as a functional component.
Yetersiz ve dengesiz beslenme endişesi ve artan sağlık problemlerinin gıda katkı maddeleri ile ilişkilendirilmesi, tüketicilerin sağlıklı ve minimal işlenmiş fonksiyonel ürünlere olan ilgisini her geçen gün artırmakladır. Diğer taraftan geri kalmış ve gelişmekte olan ülkelerde açlık sınırında yaşayan ve açlıkla mücadele eden milyonlarca insanın varlığına rağmen, endüstriyel toplumlarda büyük ölçüde önlenemeyen gıda israfı ve gıda kaynaklarında azalma devam etmektedir. Bu durum alternatif gıda arayışında büyük etkiye sahiptir. Denizlerde, göllerde, tatlı sularda doğal olarak yetişmeleri ve zengin besin bileşimleri nedeniyle dünyanın pek çok yerinde mikroalgler uzun yıllardır insanların temel besin ve geçim kaynaklarından biri olmuştur. Spirulina platensis, genellikle tek hücreli bir protein olarak kullanılan ve mavi-yeşil alg olarak bilinen ipliksi bir siyanobakteridir. Gıda sektöründe değerlendirilen hammaddelerle karşılaştırıldığında Spirulina, zengin protein, esansiyel yağ asidi ve aminoasit, karotenoit, vitamin ve mineral içeriği yanında veriminin yüksek oluşu ile dikkat çekmektedir. Zengin fitokimyasal içeriğine bağlı olarak karaciğer, sinir sistemi ve böbrek koruyucu etkileri yanında; antitümör, antienflamatuvar, antioksidan, hipoglisemik ve hipolipidemik fonksiyonlara sahip olduğu bildirilmektedir. Bu çalışmada, S. platensis'in bazı fizikokimyasal nitelikleri, insan sağlığına etkileri ve gıda teknolojisinde kullanım potansiyelinden bahsedilmiştir.
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