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ANTI-INFLAMMATORY ACTIVITY OF STEM BARK DICHLOROMETHANE FRACTION Syzygium samarangense EXTRACT AS COX-2 INHIBITOR: A BIOINFORMATICS APPROACH 树皮二氯甲烷萃取物作为COX-2抑制剂的抗炎活性:生物信息学方法
Pub Date : 2022-12-09 DOI: 10.20473/jkr.v7i2.39662
A. Sururi, M. Raihan, Elvira Ratna Aisa, Frisca Nadya Safitri, Irene Cornelia Constaty, Tukiran
 Syzygium samarangense is a plant that is rich in flavonoid compounds. Previous researchrevealed that the dichloromethane fraction from the stem bark extract contained fourbioactive compounds, namely, pinocembrin, uvangoletin, stercurensin, and aurentiacin,which had good antioxidant activity. However, research on the potential of these fourcompounds as an anti-inflammatory has not been revealed. This study aims to continueprevious research in revealing the potential of compounds in the dichloromethane fractionof S. samarangense extract as an anti-inflammatory agent in silico COX-2 inhibitors. Thisstudy uses in silico biocomputation, including drug-likeness analysis and molecular dockinganalysis using COX-2 protein and the control drug rofecoxib. The results showed that thereare compounds that have the potential as anti-inflammatory compounds, namelypinocembrin. However, further studies, such as in vitro and in vivo, are still needed to revealits potential as an anti-inflammatory agent
萨马根是一种富含黄酮类化合物的植物。先前的研究发现,从茎皮提取物中提取的二氯甲烷部分含有四种生物活性化合物,分别是匹诺曹素、乌万素、stercurrensin和金合欢素,具有良好的抗氧化活性。然而,关于这四种化合物作为抗炎药的潜力的研究尚未公布。本研究旨在继续以往的研究,揭示沙棘提取物二氯甲烷部分中化合物作为抗硅COX-2抑制剂的潜力。本研究采用硅片生物计算方法,利用COX-2蛋白和对照药物罗非昔布进行药物相似性分析和分子对接分析。结果表明,有可能作为抗炎化合物的化合物,即红霉素。然而,仍需要进一步的研究,如体外和体内研究,以揭示其作为抗炎剂的潜力
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引用次数: 1
EFFECT OF SONICATION ON THE PROPERTIES OF COMPOSITE POLYPYRROLE/MICROCELLULOSE AND ITS POTENTIAL AS A CAPACITOR 超声对聚吡咯/微纤维素复合材料性能的影响及其作为电容器的潜力
Pub Date : 2022-12-09 DOI: 10.20473/jkr.v7i2.39416
Berlian Sitorus, Deni Pranata, Mariana Bara’allo Malino
The research aims to see the effect of sonication on the properties and capacitance of composites made of microcellulose isolated from Oil Palm Empty Fruit Bunches and Polypyrrole (PPy). PPy is a conductive polymer limited by its inflexibility; hence PPy is blended with microcellulose which can serve as a good matrix to increase the flexibility of PPy. The procedure to isolate the microcellulose was done by delignification, bleaching, and hydrolysis. In order to see the effect of sonication, hydrolysis was undertaken in two different ways : (i) without sonication and (ii) using sonication. Besides, the polymerization time for pyrrole was also varied: 4 and 16 hours and simultaneously composited with each microcellulose from (i) and (ii). The results show an increase in cellulose crystallinity from  35.6% without sonication to 40% after sonication, while the diameter of the sonicated microcellulose fibers tends to be smaller than the counterpart. The 4-hour polymerization time shows that the composite containing the unsonicated microcellulose has a higher capacitance than the composite with the sonicated microcellulose, 14.8 nF and 8.8 nF, respectively. Meanwhile, a similar capacitance is measured for the 16-hour polymerization, 1.90 nF and 2.68 nF, using the sonicated and un-sonicated microcellulose. Overall, although the capacitances of the composites are in the nanofarad scale, it can be said that the composite can be potentially used as a capacitor.
研究了超声对油棕空果束分离的微纤维素与聚吡咯(PPy)复合材料性能和电容的影响。聚吡啶是一种导电聚合物,它的不灵活性限制了它的性能;因此,聚吡啶与微纤维素混合可以作为良好的基质,以增加聚吡啶的柔韧性。通过脱木质素、漂白和水解分离微纤维素。为了观察超声波的效果,水解以两种不同的方式进行:(i)不超声波和(ii)使用超声波。此外,吡罗的聚合时间也不同,分别为4和16小时,同时与(i)和(ii)中的每种微纤维素合成。结果表明,纤维素结晶度从未超声处理的35.6%增加到超声处理后的40%,而超声处理后的微纤维素纤维的直径趋于小于对应的微纤维素纤维。4小时聚合时间表明,含未超声微纤维素的复合材料比含超声微纤维素的复合材料具有更高的电容,分别为14.8 nF和8.8 nF。同时,使用超声和非超声微纤维素,在16小时聚合过程中测量了相似的电容,分别为1.90 nF和2.68 nF。总的来说,虽然复合材料的电容都在纳米级,但可以说复合材料有潜力作为电容器使用。
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引用次数: 1
ANTIOXIDANT ACTIVITIES USING DPPH, FIC, FRAP, AND ABTS METHODS FROM ETHANOLIC EXTRACT OF LEMPUYANG GAJAH RHIZOME (Zingiber zerumbet (L.) Roscoeex Sm.) 用DPPH、FIC、FRAP和ABTS等方法研究柠檬根乙醇提取物的抗氧化活性Roscoeex Sm)。
Pub Date : 2022-12-09 DOI: 10.20473/jkr.v7i2.34493
J. Rohmah
One of the Zingiber species that has long been used as traditional medicine by local Indonesian people is lempuyang (Zingiber ssp.). In its use as traditional medicine, it is more often used than other types of lempuyang, namely the lempuyang gajah (Zingiber zerumbet (L.) Roscoeex Sm.). Therefore, this study focused on the Zingiber zerumbet (L.) Roscoeex Sm. Most of the biological activities reported for this plant are attributed to phenolic contents and volatile principles. Hence, a detailed investigation of antioxidant activity, flavonoid, and phenolic content of Zingiber zerumbet (L.) Roscoeex Sm. rhizome was carried out. The purpose of this study was to determine the total flavonoid, phenolic, and antioxidant activity of Zingiber zerumbet (L.) Roscoeex Sm. extract in several methods of reducing free radicals DPPH, FIC, FRAP, and ABTS. The extraction method used is maceration extraction with 70% ethanol solvent and concentrated. The total phenolic content was determined by the Folin-Ciocalteu method with gallic acid as the standard, while the total flavonoid content was determined by the quercetin method. Ascorbic acid was used as a positive control of antioxidant activity. The Zingiber zerumbet (L.) Roscoeex Sm. plant used was obtained from the village of Tegal Bulu Banyuwangi. This type of research is an experimental study with the concentration of the extract used, namely 20, 40, 60, 80, and 100 mg/L. The results showed that the ethanol extract of Zingiber zerumbet (L.) Roscoeex Sm. rhizome contained total phenolic and flavonoid content of 23.58±0.25 mgGAE/g and 12.21±0.03 QUE/g extract, respectively. Antioxidant activity with IC50 value in the DPPH free radical reduction method of 11.40 ± 0.23 which is included in the very strong category, FIC of 121.46±2.93 which is included in the medium category, FRAP of 19.38±0.14 which is included in the very strong category, and ABTS of 89.32±0.15 which is included in the strong category. Phenolics and flavonoids are thought to have an important role in the antioxidant activity of Zingiber zerumbet (L.) Roscoeex Sm. rhizome.
长期以来被印度尼西亚当地人民用作传统药物的生姜品种之一是lempuyang (Zingiber sp.)。在作为传统药物的使用中,它比其他类型的lempuyang gajah (Zingiber zerumbet (L.))更常用。Roscoeex Sm)。因此,本研究的重点是生姜(Zingiber zerumbet, L.)Roscoeex Sm。据报道,这种植物的大部分生物活性都归因于酚含量和挥发原理。因此,对生姜的抗氧化活性、类黄酮和酚类物质含量进行了详细的研究。Roscoeex Sm。进行根茎试验。本研究的目的是测定生姜(Zingiber zerumbet, L.)的总黄酮、酚类和抗氧化活性。Roscoeex Sm。DPPH、FIC、FRAP、ABTS等自由基的提取方法。提取方法为70%乙醇溶剂浸渍浓缩提取。用没食子酸法测定总酚含量,用槲皮素法测定总黄酮含量。以抗坏血酸作为阳性对照。生姜(L.)Roscoeex Sm。所使用的植物来自Tegal Bulu Banyuwangi村。这种类型的研究是一种实验研究,使用的提取物浓度分别为20、40、60、80和100 mg/L。结果表明,生姜醇提物(L.;Roscoeex Sm。总酚和总黄酮含量分别为23.58±0.25 mg /g和12.21±0.03 QUE/g。DPPH自由基还原法的IC50值为11.40±0.23,属于极强类,FIC为121.46±2.93,属于中等类,FRAP为19.38±0.14,属于极强类,ABTS为89.32±0.15,属于强类。酚类物质和类黄酮被认为在生姜抗氧化活性中起重要作用。Roscoeex Sm。粉末。
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引用次数: 0
DETERMINING THE TANNIN CONTENT IN PISANG AMBON (Musa × paradisiaca L.) WITH THE POTENTIAL AS ANTHELMINTIC PISANG AMBON (Musa x paradisiaca L.)单宁含量的测定有驱虫的潜力
Pub Date : 2022-12-09 DOI: 10.20473/jkr.v7i2.28859
Dwi Haryatmi, I. Susilowati
Tannins result from plants' secondary metabolism, closely associated with plant defense mechanisms against insects. Condensed tannins can disrupt the life cycle of parasitic nematodes starting from eggs, adult worms, and larvae. Currently, the antiparasitic properties of condensed tannins are being investigated as an alternative for controlling parasites. The people use the young Pisang Ambon (Musa × parasidiaca L.) as an anthelmintic. People generally use this part of the banana peel. Based on this, a study was conducted to determine the tannin content in the peel and fruit of Pisang Ambon (Musa × parasidiaca L.). The research was conducted by extracting the fruit and peel of young Pisang Ambon by maceration method using 96% ethanol as solvent. The Harborne method and Thin Layer Chromatography tested the presence of secondary metabolites. The tannin content was determined by the visible, ultraviolet spectrophotometric method. The qualitative results showed that the peel and fruit of Pisang Ambon contained condensed tannins. Meanwhile, the quantitative results showed that the tannin content of the fruit (54.98% w/w) was higher than the peel (14.32 %w/w).
单宁来源于植物的次生代谢,与植物对昆虫的防御机制密切相关。浓缩单宁可以破坏寄生线虫从卵、成虫和幼虫开始的生命周期。目前,人们正在研究缩合单宁的抗寄生性能,以作为控制寄生虫的替代方法。人们使用年轻的Pisang Ambon (Musa x parasidiaca L.)作为驱虫剂。人们通常使用香蕉皮的这一部分。在此基础上,对枇杷果皮和果实中的单宁含量进行了测定。以96%乙醇为溶剂,采用浸渍法提取枇杷幼果和果皮。Harborne法和薄层色谱法检测了次生代谢物的存在。采用可见、紫外分光光度法测定单宁含量。定性分析结果表明,枇杷果皮和果实中含有浓缩单宁。定量结果表明,果实单宁含量(54.98% w/w)高于果皮(14.32% w/w)。
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引用次数: 0
Sintesis, Karakterisasi Struktur, dan Kajian Molecular Docking Senyawa Turunan 4’-Metoksi Flavonol sebagai Antagonis Reseptor Estrogen Alpha (ER-a) pada Kanker Payudara 癌症雌激素α受体拮抗剂4’-甲氧基黄酮的合成、结构特征及分子对接试验
Pub Date : 2022-09-30 DOI: 10.25077/jrk.v13i2.553
Ihsan Ikhtiarudin, Rahma Dona, Neni Frimayanti, R. Utami, Nurul Susianti, Abdi Wira Septama
A long period of drug administration in breast cancer chemotherapy can cause various side effects. These situations encourage researchers to search for and develop alternative anticancer drugs through various approaches. This study aimed to synthesize a flavonol derivative (TF4) and to study the interactions of the synthesized compound with ER-α as one of the targeted receptors in breast cancer treatment. The synthesis was carried out using the stirring method and the study of interactions of TF4 with ER-α was performed through molecular docking against ER-α crystal structures bound to an antagonist (PDB ID: 3ERT) and agonist (PDB ID: 1A52). The synthesis of TF4 produced crude product in 58 % yield and pure product in 6 % yield. The structure of TF4 was confirmed by spectroscopic analyses including UV, FT-IR, 1D, and 2D NMR. The docking results showed that the TF4 does not form any conventional hydrogen bond with ER-α. However, it can form carbon-hydrogen (C--H) bonds and van der Walls interactions with several important residues on the active site of ER-α. In addition, the binding free energy values of TF4 (-9.14 and -9.50 kcal/mol) are more negative than estradiol (E2) as one of the natural ligands for ER-α. Thus, it can be estimated that TF4 can be bounded easier on the active site of ER-α than its natural ligand. It may presume that it can act as an estrogen antagonist because of the similarity in interactions and binding poses compared to TAM, TOR, dan 4-OHT as reference drug molecules.
癌症化疗长期给药可引起多种副作用。这些情况鼓励研究人员通过各种方法寻找和开发替代抗癌药物。本研究旨在合成黄酮醇衍生物(TF4),并研究合成的化合物与作为癌症治疗靶向受体之一的ER-α的相互作用。使用搅拌法进行合成,并通过与拮抗剂(PDB ID:3ERT)和激动剂(PDB-ID:1A52)结合的ER-α晶体结构的分子对接来研究TF4与ER-α的相互作用。TF4的合成以58%的产率产生粗产物,以6%的产率产生纯产物。通过UV、FT-IR、1D和2D NMR等光谱分析证实了TF4的结构。对接结果表明,TF4与ER-α不形成任何常规氢键。然而,它可以与ER-α活性位点上的几个重要残基形成碳-氢(C-H)键和范德瓦尔斯相互作用。此外,TF4的结合自由能值(-9.14和-9.50 kcal/mol)比雌二醇(E2)更负,雌二醇是ER-α的天然配体之一。因此,可以估计TF4比其天然配体更容易结合在ER-α的活性位点上。它可以推测它可以作为雌激素拮抗剂,因为与作为参考药物分子的TAM、TOR和4-OHT相比,它在相互作用和结合姿态方面具有相似性。
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引用次数: 0
Pengaruh Lama Penyimpanan dan Pengenceran Lindi Hitam Terhadap Karakteristik Lignin Kraft Acacia mangium 老安装商黑林迪存储和加密面对卡夫木质素特征芒果Acacia
Pub Date : 2022-09-30 DOI: 10.25077/jrk.v13i2.506
Faizatul Falah, Rikna Naila Salsabila, Wita Pradiani, Azizatul Karimah, Muhammad Adly Rahandi Lubis, A. Prianto, Nissa Nurfajrin Solihat, Fahriya Puspita Sari, Rita Rusman, Irawan Kusuma Wijaya, Widya Fatriasari
This study aimed to investigate the effects of storage time and dilution of black liquor (BL) from Acacia mangium kraft pulping on the characteristics of isolated Lignin. Lignin isolation was carried out by 1 and 2 steps of isolation using HCL 1M to precipitate Lignin, diluted before isolation. Isolated Lignin was analyzed for its acid-soluble Lignin (ASL), insoluble acid lignin (AIL), functional groups by FTIR, solubility in dioxane and NaOH and thermal properties. The effect of BL storage time was also evaluated on the characteristics of the Lignin produced. The results suggest that the longer BL is stored, the higher the lignin yield. When compared to the isolation approach without dilution, the dilution process produced a higher yield and ash content up to 84% and 21%, respectively. Without dilution, the AIL isolated was lower than the dilution during BL storage. The longer the storage duration, the higher the lignin purity. Compared to two-step lignin isolation, dilution treatment in single-step isolation improves yield and purity. The thermal stability of lignin isolation without dilution (184 ⁰C and 167 ⁰C for 1 and 2 steps, respectively) was higher than that of isolated Lignin with dilution (154.8 ⁰C and 160.9 ⁰C for 1 and 2 steps, respectively), according to thermal study. Both lignin isolates with and without dilution have comparable functional groups, as shown by FTIR spectra. Due to the high yield and purity of isolated Lignin, BL dilution could be a viable alternative in lignin isolation from BL. Moreover, the properties of isolated Lignin are also influenced by BL storage.
本研究旨在研究芒果Acacia硫酸盐法制浆黑液的贮存时间和稀释度对分离木质素特性的影响。木质素分离通过1和2个分离步骤进行,使用HCL1M沉淀木质素,在分离前稀释。通过红外光谱分析了分离木质素的酸溶性木质素(ASL)、不溶性酸性木质素(AIL)、官能团、在二恶烷和氢氧化钠中的溶解度以及热性能。还评价了BL储存时间对所生产的木质素特性的影响。结果表明,BL储存时间越长,木质素产率越高。与不稀释的分离方法相比,稀释过程产生了更高的产率和灰分含量,分别高达84%和21%。在没有稀释的情况下,分离的AIL低于BL储存期间的稀释度。贮藏时间越长,木质素纯度越高。与两步分离木质素相比,一步分离中的稀释处理提高了产率和纯度。未经稀释的木质素分离的热稳定性(184⁰C和167⁰C分别用于1步和2步)高于稀释的分离木质素(154.8⁰C和160.9⁰C分别用于1步和2步)。FTIR光谱显示,稀释和未稀释的木质素分离物都具有相当的官能团。由于分离的木质素产量高、纯度高,BL稀释可能是从BL中分离木质素的一种可行的选择。此外,分离的木质蛋白的性质也受到BL储存的影响。
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引用次数: 0
Evaluation of Lipid Profile and Liver Function After Administration of Scenedesmus dimorphus in Obese Mice 给药后肥胖小鼠血脂和肝功能的变化
Pub Date : 2022-09-30 DOI: 10.25077/jrk.v13i2.503
Armaini Armaini, Siti Hajir, Y. Rilda
Obesity is a major public health problem in developing countries and is a significant risk factor for metabolic disorders. Microalgae Scenedesmus dimorphus (S. dimorphus) contains bioactive compounds such as pigment function as antioxidants, and omega-3 and omega-6 PUFAs have potential as nutraceuticals. The study aimed to evaluate the lipid profile and liver function after the administration of S. dimorphus in obese mice. The research design uses mice which are divided into 6 groups; Group 1 (G1) normal control, G2 control Obesity, G3 treatment with Orlistat, G4 treatment S. dimorphus (0.25mg/g BW), G5 treatment S. dimorphus (0.5 mg/g BW) and G6 treatment S. dimorphus (0.75 mg/g BW) each group consisted of 5 mice and 21 days of observation time. The parameters observed were lipid profile and liver function of mice. Based on the results of the study, the effective dose for treating obesity is a dose of S. dimorphus 0.75 mg/g (BW) can reduce cholesterol, triglycerides, and LDL levels, respectively 67.7 mg/dl, 49.2 mg/dl, 10 , 2 mg/dl, and increased HDL, 68.32 mg/dl compared to control of obesity (G2), respectively 108.7 mg/dl, 139.1 mg/dl, 20.6 mg/dl and HDL 60, 28 mg/dl, this dose is also effective for improving the function of blood pressure by reducing AST and ALT 15.6 U/L and 18.8 U/L, respectively, compared to the obesity group (G2), which is 26.6 U/L, and 29,7 U/L. Based on the results of the study it can be concluded that S. dimorphus is useful for anti-obesity for mice (Mus musculus).
肥胖是发展中国家的一个主要公共卫生问题,也是代谢紊乱的一个重要风险因素。微藻Scenedesmus dimorphus(S.dimorphs)含有生物活性化合物,如具有抗氧化剂功能的色素,ω-3和ω-6 PUFA具有作为营养品的潜力。本研究旨在评估肥胖小鼠服用二形态硫杆菌后的脂质状况和肝功能。研究设计采用小鼠,分为6组;第1组(G1组)正常对照组,G2组对照肥胖组,G3组用奥利司他治疗,G4组用双孢双孢双孢子虫(0.25mg/g BW)治疗,G5组用双孢子双孢单孢子虫(0.5mg/g BW)和G6组用双锥双孢子单孢双孢子菌(0.75mg/g BW.)治疗,每组5只小鼠,观察时间21天。观察到的参数是小鼠的脂质概况和肝功能。基于该研究的结果,治疗肥胖的有效剂量是0.75 mg/g剂量的双孢单胞菌(BW),与控制肥胖(G2)相比,其可分别降低胆固醇、甘油三酯和LDL水平,分别为67.7mg/dl、49.2mg/dl、10、2mg/dl,并增加HDL,分别为68.32mg/dl,分别为108.7mg/dl、139.1mg/dl、20.6mg/dl和HDL 60、28mg/dl,与肥胖组(G2)26.6U/L和29.7U/L相比,该剂量还通过降低AST和ALT分别为15.6 U/L和18.8 U/L而有效改善血压功能。根据这项研究的结果,可以得出结论,二形态S.dimorphus对小鼠(Mus musculus)的抗肥胖是有用的。
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引用次数: 1
Aktivitas Anti Hiperurisemia Ekstrak Akar Kaik-kaik (Uncaria cordata. L. Merr) pada Mencit (Mus muscullus) yang Diinduksi Kalium Oksonat 钩藤(Uncaria corda.L.Merr)在草酸钾诱导的Mus Musculus中的抗嬉皮士活性
Pub Date : 2022-09-30 DOI: 10.25077/jrk.v13i2.517
Nurhamidah Nurhamidah, Rima Fadillah, Elvinawati Elvinawati, D. Handayani
Consuming food containing high level of purin leads to increase uric acid in the blood which, in turn, cause hyperuricemia or high uric acid level. The use of improper allopurinol for hyperuricemia medication that doesn’t follow medical doctor’s prescription can give harmful side effect. It is therefore required to use an alternative safe medication. Uncaria cordata (Lour.) Merr.) is a plant often used for medication of high levels of blood uric acid by communities in Pasar Ngalam village, Bengkulu Province. This research aims to evaluate the potency of extracted compounds from Uncaria cordata (Lour.) Merr.) in reducing uric acid of Mus musculus suffering from hyperuricemia. This research is a laboratory experiment using completed random design. As many as 25 Mus musculus were divided into 5 groups of treatment: PN = normal treatment, PA = treated with allopurinol, P1 – P3 = treated with extracted compound of Uncaria cordata (Lour.) Merr.) with a dose of 5.3 mg/30gBW (P1); 10.6 mg/30gBW (P2); and 21.2 mg/30gBW (P3). In order for Mus musculus to suffer from high uric acid level, potassium oxonate-induced hyperuricemia was injected. The result showed that extracted compounds of Uncaria cordata (Lour.) Merr.) using ethanol exhibited antihyperuricemia proven by decline of uric acid level of Mus musculus from hyperuricemia on each given dose. Decreasing uric acid level for each given dose of ethanol extract (5.3 mg/30gBW, 10.6mg/30gBW and 21.2mg/30gBW) was not significant different (0.541; with a ³0.05).
食用含有高水平嘌呤的食物会导致血液中的尿酸增加,从而导致高尿酸血症或高尿酸水平。不按照医生的处方使用不正确的别嘌呤醇治疗高尿酸血症会产生有害的副作用。因此需要使用另一种安全的药物。钩藤(Lour.)在Bengkulu省Pasar Ngalam村的社区,Merr.)是一种经常用于治疗高血尿酸水平的植物。本研究旨在评价钩藤(Uncaria cordata, Lour)提取物的效价。在降低患有高尿酸血症的小家鼠的尿酸。本研究采用完全随机设计的实验室实验。将25只小家鼠分为5组:PN组为正常组,PA组为别嘌呤醇组,P1 ~ P3组为鱼尾藤提取物组。剂量为5.3 mg/30gBW (P1);10.6 mg/30gBW (P2);21.2 mg/30gBW (P3)。为了使小家鼠出现高尿酸血症,注射氧酸钾致高尿酸血症。结果表明,钩藤提取物的主要成分为:在每次给药后,高尿酸血症引起的小家鼠尿酸水平下降,证明使用乙醇能抗高尿酸血症。各剂量乙醇提取物(5.3 mg/30gBW、10.6mg/30gBW和21.2mg/30gBW)降低尿酸水平无显著差异(0.541;a³0.05)。
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引用次数: 0
Teknik Edible Coating dengan menggunakan Campuran Gel Lidah Buaya dan Ekstrak Daun Psidium guajava L. untuk Mempertahankan Sifat Fisikokimia Buah Jambu Biji
Pub Date : 2022-09-30 DOI: 10.25077/jrk.v13i2.501
Refilda Refilda, Riga Habib Ngestu, Emil Salim, Yefrida
The synthetic chemicals is a common substance used to extend the shelf life of postharvest fruit. But it can have health impact. The use of edible coatings from natural ingredients has begun to be developed. Modification of aloe vera gel by guava leaf extract as the edible coating to increase guava fruit shelf life has not been reported yet. Guava fruit coated by several compositions of aloe vera gel and guava leaf extract have been carried out. Observations on physichochemical in fruit on the days 0, 3, 6, 9, 12 and 15 were evaluated. The best quality found on guava fruit treated with the compotition of aloe vera gel:ethanol guava leaf extract: CMC:glycerol (90: 5:0.25: 0.5) on the day 15. It had a weight loss of 9.88%, a spoilage of 3.33%, the decrease of water content 11.61%, titratable acidity 0.5%, total antioxidant 1.08 mg AA/g FW, total phenolic 0.51 mg GAE/g FW, and increase of total dissolved solids 3.01 oBrix. This result was significantly better than the uncoated fruit. It can be concluded that guava leaf extract can be used to maintain the physicochemical properties during storage.
合成化学物质是一种常见的用于延长采后水果保质期的物质。但它会对健康产生影响。使用天然成分制成的可食用涂料已经开始得到发展。用番石榴叶提取物改性芦荟凝胶作为可食用涂层以延长番石榴果实的保质期尚未报道。用芦荟凝胶和番石榴叶提取物的几种成分包被番石榴果实。对第0、3、6、9、12和15天果实理化性质的观察结果进行了评价。在第15天,用芦荟凝胶:乙醇番石榴叶提取物:CMC:甘油(90:5:0.25:0.5)的复合物处理番石榴果实的质量最好。它的重量损失了9.88%,变质率为3.33%,含水量下降了11.61%,可滴定酸度下降了0.5%,总抗氧化剂1.08 mg AA/g FW,总酚0.51 mg GAE/g FW,溶解固体总量增加了3.01 oBrix。这一结果明显好于未包衣的果实。可以得出结论,番石榴叶提取物可以在储存过程中保持其理化性质。
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引用次数: 0
Ekspansi Termal, Oxygen Content, dan Sifat Elektrokimia Oksida SmBa0.5Sr0.5Co2O5+δ (70%) + SDC (30%) Sebagai Katoda SOFC SmBa0.5Sr0.5Co2O5+δ(70%)+SDC(30%)作为SOFC阴极的膨胀期、含氧量和电化学性能
Pub Date : 2022-09-30 DOI: 10.25077/jrk.v13i2.557
Adi Subardi, Yen-Pei Fu
The thermal properties of the double perovskite SmBa0.5Sr0.5Co2O5+δ (70%) + SDC (30%) have been investigated as potential cathodes for intermediate-temperature solid oxide fuel cells (IT-SOFC). This study also includes the oxygen content and electrochemical performance of long-term tests carried out to evaluate the electrochemical stability. Cathode powder is fabricated by a simple and relatively inexpensive solid-state reaction. Oxygen content decreased gradually from room temperature to 800oC by 18.3%. Doping 30% SDC into SBSC oxide can reduce the thermal expansion coefficients (TEC) value from 19.80 x 10-6 (K-1) to 18.17 x 10-6 (K-1) or a decrease of 8.23%. The activation energy (Ea) identified by the electrochemical impedance spectroscopy (EIS), low field (LF), and high field (HF) techniques were 125.3 kJ mol-1, 60.6 kJ mol-1, and 62.5 kJ mol-1, respectively. The SBSC73|SDC|SBSC73 symmetric cell test for 96 hours at 600oC showed an increase in the average polarization resistance value of 0.30% h-1. The cathode grains are evenly distributed with a size of 2-3 µm and tend to be porous. These results exhibit that SmBa0.5Sr0.5Co2O5+δ (70%) + SDC (30%) is a promising cathode material for IT-SOFCs.
研究了双钙钛矿SmBa0.5Sr0.5Co2O5+δ (70%) + SDC(30%)作为中温固体氧化物燃料电池(IT-SOFC)阴极的热性能。本研究还包括对氧含量和电化学性能的长期测试,以评价其电化学稳定性。阴极粉末是通过一种简单且相对便宜的固态反应制备的。从室温到800oC,氧含量逐渐下降18.3%。在SBSC氧化物中掺入30% SDC后,其热膨胀系数(TEC)由19.80 × 10-6 (K-1)降至18.17 × 10-6 (K-1),降低幅度为8.23%。电化学阻抗谱(EIS)、低场(LF)和高场(HF)技术鉴定的活化能(Ea)分别为125.3 kJ mol-1、60.6 kJ mol-1和62.5 kJ mol-1。SBSC73|SDC|SBSC73对称电池在600℃下测试96小时,平均极化电阻值增加0.30% h-1。阴极颗粒分布均匀,尺寸为2 ~ 3µm,具有多孔性。结果表明,SmBa0.5Sr0.5Co2O5+δ (70%) + SDC(30%)是一种很有前途的it - sofc正极材料。
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Jurnal Riset Kimia
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