Downstream Utilization of Palm Oil Waste: The Potential of the Unsaponifiable Fraction as a Natural Anti-Aging and Moisturizing Active Ingredient for the Modern Cosmetics Industry / Hilirisasi Limbah Kelapa Sawit: Potensi Fraksi Tak Tersabunkan sebagai Bahan Aktif Anti-Aging dan Pelembap Alami dalam Industri Kosmetik Modern

Background: The Indonesian palm oil industry generates substantial waste, one of which is Palm Fatty Acid Distillate (PFAD), which has been predominantly utilized as a low-value industrial raw material or discarded as waste. However, PFAD contains an unsaponifiable fraction rich in high-value bioactive compounds such as vitamin E (tocotrienols and tocopherols), squalene, phytosterols, and carotenoids, which possess significant potential as natural cosmetic active ingredients. Objective: This study aims to examine the potential of palm oil waste downstreaming, particularly the unsaponifiable fraction of PFAD, as a source of bioactive compounds for anti-aging and moisturizing applications in the modern cosmetics industry. Methods: This research is a Systematic Literature Review (SLR) employing a qualitative descriptive approach. Literature searches were conducted through Google Scholar, PubMed, and Science Direct databases using keywords related to palm oil waste, PFAD, and unsaponifiable fraction, with publication restrictions set for the last five years (2021–2026). From 210 initially identified articles, 9 articles were selected after screening processes based on titles, abstracts, and full-text eligibility. Data were analyzed using a descriptive meta-synthesis approach. Results: The findings indicate that PFAD contains significant bioactive compounds, with total tocotrienol reaching 2,136 ppm and vitamin E levels up to 12,282 ppm after purification processes. The most effective extraction methods were achieved through supercritical CO₂ with ethanol as a co-solvent (30.03 ± 0.03 mg/g) and ionic liquid [C₄MIM]Ac (75.41% efficiency). The bioactive compounds of the unsaponifiable fraction demonstrated potent antioxidant activity (IC₅₀ up to 23.3 ppm), which plays a role in inhibiting oxidative stress—a primary factor in premature aging—while also maintaining skin moisture through emollient mechanisms. Formulation studies revealed that nanoemulsion applications increased skin moisture from 51% to 62.5% and elasticity from 85% to 98.5%, while palm lipid-based body butter, cream, and lotion preparations exhibited good physical stability with skin-safe pH (5–6) and no irritation. Conclusion: The unsaponifiable fraction of palm oil waste has strategic potential to be developed as a modern cosmetic active ingredient, supporting the concept of a circular economy and national cosmetic raw material self-sufficiency. However, further research is still required for clinical validation of anti-aging and moisturizing effects on human skin, as well as optimization of sustainable processing technologies.

Latar Belakang: Industri kelapa sawit Indonesia menghasilkan limbah dalam jumlah besar, salah satunya adalah Palm Fatty Acid Distillate (PFAD), yang selama ini lebih banyak dimanfaatkan sebagai bahan baku industri bernilai rendah atau dibuang sebagai limbah. Padahal, PFAD mengandung fraksi tak tersabunkan (unsaponifiable fraction) yang kaya akan senyawa bioaktif bernilai tinggi seperti vitamin E (tokotrienol dan tokoferol), skualen, fitosterol, dan karotenoid yang memiliki potensi sebagai bahan aktif kosmetik alami. Tujuan: Penelitian ini bertujuan untuk mengkaji potensi hilirisasi limbah kelapa sawit, khususnya fraksi tak tersabunkan dari PFAD, sebagai sumber senyawa bioaktif untuk aplikasi anti-aging dan pelembap dalam industri kosmetik modern. Metode: Penelitian ini merupakan Systematic Literature Review (SLR) dengan pendekatan deskriptif kualitatif. Pencarian literatur dilakukan melalui database Google Scholar, PubMed, dan Science Direct menggunakan kata kunci terkait limbah kelapa sawit, PFAD, dan fraksi tak tersabunkan, dengan batasan publikasi 5 tahun terakhir (2021–2026). Dari 210 artikel yang diidentifikasi, 9 artikel terpilih setelah melalui proses penyaringan berdasarkan judul, abstrak, dan kelayakan naskah lengkap. Data dianalisis menggunakan pendekatan meta-sintesis deskriptif. Hasil: Hasil kajian menunjukkan bahwa PFAD mengandung senyawa bioaktif yang signifikan, dengan total tokotrienol mencapai 2.136 ppm dan kadar vitamin E hingga 12.282 ppm setelah proses pemurnian. Metode ekstraksi terbaik diperoleh melalui supercritical CO₂ dengan etanol sebagai co-solvent (30,03 ± 0,03 mg/g) dan ionic liquid [C₄MIM]Ac (efisiensi 75,41%). Senyawa bioaktif fraksi tak tersabunkan terbukti memiliki aktivitas antioksidan kuat (IC₅₀ hingga 23,3 ppm) yang berperan dalam menghambat stres oksidatif, penyebab utama penuaan dini, serta menjaga kelembapan kulit melalui mekanisme emolien. Studi formulasi menunjukkan aplikasi dalam nanoemulsi meningkatkan kelembapan kulit dari 51% menjadi 62,5% dan elastisitas dari 85% menjadi 98,5%, sedangkan sediaan body butter, krim, dan lotion berbasis lipid sawit menunjukkan stabilitas fisik yang baik dengan pH aman bagi kulit (5–6) serta tidak menimbulkan iritasi. Kesimpulan: Fraksi tak tersabunkan limbah kelapa sawit berpotensi strategis dikembangkan sebagai bahan aktif kosmetik modern yang mendukung konsep ekonomi sirkular dan kemandirian bahan baku kosmetik nasional. Namun, masih diperlukan penelitian lanjutan untuk validasi klinis efek anti-aging dan pelembap pada kulit manusia, serta optimalisasi teknologi pengolahan yang berkelanjutan.