Pretreatment at mild condition is the strategy to minimize energy consumption, to reduce toxic compounds influencing to further process, and to obtain the high reducing sugar yield as fermentation substrate from cellulose and hemicellulose of oil palm empty fruit bunches (OPEFB). The yield still could be increased by optimizing pretreatment condition and varying several process alternatives. In this study, the effect of acetic acid addition and its corresponding concentration (5–15%), pretreatment temperature (115–125 °C), time (60–90 minutes), and two-stage pretreatment (0.01–1M NaOH pretreatment followed by autohydrolysis and autohydrolysis followed by 0.1–1% acetic acid pretreatment) were evaluated. The residual solid after pretreatment was then enzymatically hydrolyzed by Cellic CTec2. The result showed that the addition of acetic acid was able to increase the yield of reducing sugar. In addition, the reducing sugar yield could be still increased when the temperature was escalated, but the extended pretreatment time gave the decline of reducing sugar yield. This yield, however, was still lower than this from NaOH pretreatment followed by autohydrolysis. The maximum yield of this pretreatment could be attained by 1 M NaOH concentration at 125 °C for 60 minutes with solid loading 10% (0.71 g/g-OPEFB).
Pretreatment of oil palm empty fruit bunches (OPEFB) catalyzed by weak acids (oxalic, formic, and citric acid) in an autoclave under moderate condition is one of the appropriate pretreatment alternatives to recover reducing sugar both from cellulose and hemicellulose. This sugar can be fermented to be various bioprocess products. In this study, the effect of weak acid concentration (1–5% for oxalic acid; 5–20% for formic and citric acid), pretreatment temperature (115–125°C), time (60–90 min), and solid loading (5–10%) was investigated. To improve total reducing sugar yield, residual solid after pretreatment was subsequently hydrolyzed by Cellic CTec2. With the increasing weak acid concentration, pretreatment temperature, and time, more reducing sugar was obtained in spent liquor of pretreatment. On the contrary, the increase of solid loading declined the reducing sugar yield. After residual solid was enzymatically hydrolyzed, the amount of reducing sugar significantly elevated for nearly all weak acids, except 5% oxalic acid pretreatment. However, the pretreatment by 5% oxalic acid gave the maximum yield of total reducing sugar at 125°C for 60 min and using 5% solid loading. The reducing sugar obtained in spent liquor and hydrolysate at this optimum condition was 0.245 g/g OPEFB and 0.352 g/g OPEFB, respectively.
Various weeds in paddy rice fields could be utilized as natural polyphenols sources, one of them was kitolod (Hippobroma longiflora (L.) G.Don). Kitolod was widely utilized as traditional medicine by several community groups because of its polyphenols content. Recent trends showed kitolod could be valorized as additive matters in sunscreen products. Polyphenols content, especially flavonoids were able to absorb dangerous spectrum in sunray radiation and it is related to sunscreen activity. This study aimed to evaluate the differences in simplicia treatments and extraction techniques towards total polyphenols content and sunscreen activity on kitolod leaf extracts. Solvent-cold extraction techniques were deployed in this study that consist of water infusion and ethanolic maceration for 24 hours at ambient temperature. Extracts were analyzed by spectrophotometric measurement to determine total phenolics content (TPC), total flavonoids content (TFC), and sunscreen activity by deploying Folin-Ciocalteu assay, AlCl3 colorimetric assay, and Mansur approached assay, respectively. Dry kitolod leaves were extracted by ethanolic maceration techniques provided high yields (15.5±0.3%), high TPC (17.9±0.3 mg GAE/g of solids), high TFC (25.9±0.4 mg QE/g of solids), and moderate sunscreen activity (SPF 11.0±0.1). The results indicated kitolod could be valorized as natural polyphenols sources and additive matters in any cosmetical sunscreen products.
Gondorukem menjadi produk utama dari pengolahan getah pinus yang dikenal sebagai salah satu komoditas unggulan ekspor Indonesia. Peningkatan permintaan terhadap gondorukem terjadi pada setiap tahunnya karena produk ini banyak dimanfaatkan dalam berbagai sektor industri. Permintaan yang semakin meningkat menyebabkan kapasitas produksi gondorukem perlu ditingkatkan, termasuk pada Pabrik Gondorukem dan Terpentin (PGT) Sindangwangi yang merupakan pabrik pengolahan getah pinus milik Perum Perhutani. Peningkatan kapasitas produksi secara langsung mempengaruhi kinerja produksi yang meliputi manajemen proses dan desain produksi, khususnya yang berkaitan dengan jumlah kehilangan bahan. Penelitian ini bertujuan untuk mengevaluasi jumlah kehilahan bahan yang berupa larutan getah selama proses produksi berlangsung di PGT Sindangwangi. Metode yang digunakan meliputi observasi langsung mengenai tahapan produksi dan pendekatan analisis perhitungan neraca massa sehingga dapat teridentifikasi setiap komponen dalam aliran massa bahan di setiap unit proses. Proses produksi gondorukem di PGT Sindangwangi terdiri dari tiga tahapan utama yang diuraikan ke dalam lima unit proses. Kelima unit proses yang terdiri dari unit penerimaan getah, unit pengenceran, unit pencucian dan pengendapan, unit penampungan, dan unit pemasakan kemudian dianalisis mengenai input dan output aliran massa bahan pada setiap unitnya. Hasil analisis menunjukkan larutan getah yang hilang selama proses produksi gondorukem yaitu sebesar 0,03% dari jumlah bahan baku yang diolah. Angka tersebut memenuhi kriteria jumlah kehilangan bahan yang telah ditetapkan oleh perusahaan yaitu ≤0,50% (per bahan baku yang diolah). Gum rosin is the main product of pine resin processing and known as leading commodities export in Indonesia. The increasing demand for gum rosin occurs every year because this product is widely used in various industry. The increasing demand caused the production capacity to be increased, including PGT Sindangwangi which is one of pine resin processing owned by Perum Perhutani. Increased production capacity affected to production performance its consist to process management and production design, especially related to material losses. This study aims to evaluate the amount of material losses in the form of pine gum solution during production processes in PGT Sindangwangi. Research methods deployed direct observation on production process and an analytical approach of mass balance calculation its could be identified material composition on each mass flow. Production processes at PGT Sindangwangi consist to three main stages processes then divided into five process units. The five units consist to pine sap receiving unit, dilution unit, settling unit, shelter unit, and distillation unit were then analysed based on material mass flow inputs and outputs in each unit. The results of analysis showed the amount of material losess during gum rosin production process is 0.03% of raw materials. The value was qualified to company criteria about an amount of material losses about ≤0,50% (per raw materials amount).
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