Anti-interleukin-17 therapies for moderate/severe psoriasis in clinical practice: effectiveness, safety and association with clinical patient factors.

OBJECTIVES: Interleukin-17 (IL-17) contributes to the pathogenesis of psoriasis. Secukinumab, ixekizumab, and brodalumab are monoclonal antibodies anti-IL-17 antibodies, approved for the treatment of moderate/severe plaque psoriasis.The aim of the study was to describe the effectiveness and safety of anti-IL-17 agents in moderate/severe plaque psoriasis in clinical practice. We also analysed anti-IL-17 therapies' survival, dose adjustment, and clinical patients' factors associated with their effectiveness and safety. METHODS: A retrospective, longitudinal study was conducted at a tertiary hospital. We included patients with moderate/severe psoriasis treated with anti-IL-17 agents. The effectiveness was evaluated with Psoriasis Area and Severity Index (PASI) score and safety through the adverse drug reactions (ADRs) collected. RESULTS: 38 patients were studied (median age=47.4 years, 71.0% male). The mean number of biological therapies that patients received was 2.6, and anti-IL-17 therapy was the first biological therapy for 36.8% of patients. The median years in treatment were 2.5 (95% CI 1.95 to 2.98) for secukinumab, 1.2 (95% CI 0.36 to 1.47) for ixekizumab, and 0.7 (IQR 0.71) for brodalumab. The median PASI score after 6 months of treatment was 0 (IQR 0) and 85.3% of patients achieved a PASI of 90 (84.0% with secukinumab, 87.5% with ixekizumab, and 100% with brodalumab). Dose adjustment was associated with the line of treatment (p=0.034 for naïve patients), age (p=0.044 for younger patients), and concomitant pathologies (p=0.015 without more diseases).24 patients suffered from ADRs, mainly infections of the upper respiratory tract, and there were no statistically significant differences between the three therapies. CONCLUSIONS: Anti-IL-17 agents constitute an effective treatment for patients with moderate/severe plaque psoriasis and for longer. Dose reductions were associated with fewer lines of treatment, younger patients and absence of concomitant pathologies. ADR were minor and similar among the anti-IL-17.

[Translated article] Biological and immunosuppressive medications in pregnancy, breastfeeding and fertility in immune mediated diseases.

OBJECTIVE: The objective of this review is to gather the available evidence on the different drugs used in immune-mediated inflammatory diseases in pregnancy, lactation, their influence on female and male fertility, advice on discontinuation before conception and to help in routine clinical practice for better patient advice on family planning. METHODS: A bibliographic search was carried out, where published articles (review studies, observational studies and case series) in English or Spanish until April 2020 that analyzed the management of pregnancy, lactation and/or fertility in patients on treatment in immune-mediated diseases were selected. RESULTS: A total of 95 references were selected and the information on each drug was synthesized in tables. Drugs contraindicated in pregnancy are topical retinoids, pimecrolimus, cyclooxygenase 2 inhibitors, methotrexate, mycophenolate mofetil, leflunomide, acitretin, and thiopurines. The lack of data advises against the use of apremilast, tofacitinib, baricitinib, anakinra, abatacept, tocilizumab and the new biologicals. Topical salicylates, paracetamol, ultraviolet therapy and hydroxychloroquine treatment are safe, and anti-TNF biological therapy are considered low risk, with certolizumab being the drug of choice throughout pregnancy and lactation. Most are compatible with paternal exposure except for sulfasalazine, mycophenolate and leflunomide, for which suspension of treatment prior to conception is recommended, and cyclosporine with dose requirements of less than 2 mg/kg/day. CONCLUSIONS: In this context of chronic treatments with teratogenic potential, it is necessary to highlight the importance of pregnancy planning to select the safest drug. Given the quality of the available data, it is still necessary to continuously update the information, as well as to promote observational studies of cohorts of pregnant patients and men of childbearing age, including prospective studies, in order to generate more scientific evidence.

Biological and immunosuppressive medications in pregnancy, breastfeeding and fertility in immune mediated diseases. / Medicamentos inmunosupresores y biológicos en el embarazo, la lactancia y la fertilidad en enfermedades inmunomediadas.

OBJECTIVE: The objective of this review is to gather the available evidence on the different drugs used in immune-mediated inflammatory diseases in pregnancy, lactation, their influence on female and male fertility, advice on discontinuation before conception and to help in routine clinical practice for better patient advice on family planning. METHODS: A bibliographic search was carried out, where published articles (review studies, observational studies and case series) in English or Spanish until April 2020 that analyzed the management of pregnancy, lactation and/or fertility in patients on treatment in immune-mediated diseases were selected. RESULTS: A total of 95 references were selected and the information on each drug was synthesized in tables. Drugs contraindicated in pregnancy are topical retinoids, pimecrolimus, cyclooxygenase 2 inhibitors, methotrexate, mycophenolate mofetil, leflunomide, acitretin, and thiopurines. The lack of data advises against the use of apremilast, tofacitinib, baricitinib, anakinra, abatacept, tocilizumab and the new biologicals. Topical salicylates, paracetamol, ultraviolet therapy and hydroxychloroquine treatment are safe, and anti-TNF biological therapy are considered low risk, with certolizumab being the drug of choice throughout pregnancy and lactation. Most are compatible with paternal exposure except for sulfasalazine, mycophenolate and leflunomide, for which suspension of treatment prior to conception is recommended, and cyclosporine with dose requirements of less than 2mg/kg/day. CONCLUSIONS: In this context of chronic treatments with teratogenic potential, it is necessary to highlight the importance of pregnancy planning to select the safest drug. Given the quality of the available data, it is still necessary to continuously update the information, as well as to promote observational studies of cohorts of pregnant patients and men of childbearing age, including prospective studies, in order to generate more scientific evidence.

Medicamentos inmunosupresores y biológicos en el embarazo, la lactancia y la fertilidad en enfermedades inmunomediadas / Biological and immunosuppressive medications in pregnancy, breastfeeding and fertility in immune mediated diseases

Objetivo: El objetivo de esta revisión es reunir la evidencia disponible de los diferentes medicamentos utilizados en las enfermedades inflamatorias inmunomediadas en la gestación y lactancia, su influencia en la fertilidad femenina y masculina, consejos sobre su suspensión antes de la concepción y servir de ayuda en la práctica clínica habitual para un mejor consejo al paciente en la planificación familiar.Métodose realizó una búsqueda bibliográfica, donde se seleccionaron los artículos publicados (estudios de revisión, observacionales y series de casos) en lengua inglesa o española hasta abril de 2020 que analizaban el manejo del embarazo, la lactancia y/o la fertilidad en pacientes con tratamientos utilizados en las enfermedades inflamatorias inmunomediadas de dermatología, reumatología y digestivas.Resultadosse seleccionaron un total de 95 referencias y se sintetizó la información de cada medicamento en tablas. Los fármacos contraindicados en el embarazo son los retinoides tópicos, pimecrolimus, inhibidores de la ciclooxigenasa 2, metotrexato, micofenolato de mofetilo, leflunomida, acitretina y tiopurinas. La falta de datos desaconseja el uso de apremilast, tofacitinib, baricitinib, anakinra, abatacept, tocilizumab y los nuevos biológicos. Mientras que son seguros los salicilatos y los emolientes tópicos, el paracetamol, la terapia ultravioleta, la hidroxicloroquina y en la terapia biológica los anti-TNF se consideran de bajo riesgo, siendo el certolizumab el de elección durante todo el embarazo y la lactancia. La mayoría son compatibles con la exposición paterna, excepto algunos como la sulfasalazina, micofenolato y leflunomida, que se recomienda la suspensión del tratamiento previa a la concepción, y la ciclosporina con requerimientos de dosis inferiores a 2 mg/kg/día. (AU)

Objective: The objective of this review is to gather the available evidence on the different drugs used in immune-mediated inflammatory diseases in pregnancy, lactation, their influence on female and male fertility, advice on discontinuation before conception and to help in routine clinical practice for better patient advice on family planning.MethodsA bibliographic search was carried out, where published articles (review studies, observational studies and case series) in English or Spanish until April 2020 that analyzed the management of pregnancy, lactation and/or fertility in patients on treatment in immune-mediated diseases were selected.ResultsA total of 95 references were selected and the information on each drug was synthesized in tables. Drugs contraindicated in pregnancy are topical retinoids, pimecrolimus, cyclooxygenase 2 inhibitors, methotrexate, mycophenolate mofetil, leflunomide, acitretin, and thiopurines. The lack of data advises against the use of apremilast, tofacitinib, baricitinib, anakinra, abatacept, tocilizumab and the new biologicals. Topical salicylates, paracetamol, ultraviolet therapy and hydroxychloroquine treatment are safe, and anti-TNF biological therapy are considered low risk, with certolizumab being the drug of choice throughout pregnancy and lactation.Most are compatible with paternal exposure except for sulfasalazine, mycophenolate and leflunomide, for which suspension of treatment prior to conception is recommended, and cyclosporine with dose requirements of less than 2mg/kg/day. (AU)

Aggressiveness of end-of-life cancer care: what happens in clinical practice?

PURPOSE: End-of-life cancer care varies widely, and very few centers evaluate it systematically. Our objective was to assess indicators of the aggressiveness of end-of-life cancer care in clinical practice. METHODS: An observational, longitudinal, and retrospective cohort study was conducted at a tertiary hospital. Eligible patients were at least 18 years old, had a solid tumor, were followed up by the Oncology Department, and had died because of cancer or associated complications during 2017. We used the criteria of Earle et al. (J Clin Oncol 21(6):1133-1138, 2003) to assess the aggressiveness of care. Multivariate logistic regression analyses were performed to characterize factors associated with aggressiveness of therapy. RESULTS: The study population comprised 684 patients. Eighty-eight patients (12.9%) received anti-cancer treatment during the last 14 days of their lives, and 62 patients (9.1%) started a new treatment line in the last 30 days. During the last month of life, 102 patients (14.9%) visited the ER, 80 patients (11.7%) were hospitalized more than once, and 26 (3.8%) were admitted to the ICU. A total of 326 patients (47.7%) died in the acute care unit. A total of 417 patients (61.0%) were followed by the Palliative Care Unit, and in 54 cases (13.0%), this care started during the last 3 days of life. CONCLUSIONS: The use of anti-cancer therapies and health care services in our clinical practice, except for the ICU, did not meet the Earle criteria for high-quality care. Concerning hospice care, more than half of the patients received hospice services before death, although in some cases, this care started close to the time of death.

The use of autologous serum eye drops for the treatment of ocular surface disorders.

OBJECTIVES: To investigate the use of autologous serum (AS) eye drops in patients with ocular surface disorders who were refractory to conventional treatments. METHODS: A retrospective cohort study was conducted at a tertiary care centre. We included patients with a prescription of AS eye drops from December 2006 to January 2016. Electronic prescriptions (Prescriplant) and clinical histories were reviewed. A database with sociodemographic and pharmacotherapheutic variables was created. The efficacy was evaluated subjectively and adverse effects was a measurement of safety. AS eye drops were elaborated, in a laminar flow hood, with the blood samples for a final concentration of 20%. RESULTS: One hundred and seventy-three patients were considered for the study, 78.03% of them female. Their mean age was 63.87 years (SD 16.69). The use of AS eye drops was indicated for several diseases: corneal diseases (corneal ulcer or corneal persistent epithelial defects) (34.32%); Sjögren syndrome (17.16%); dry eye resulting from autoimmune disease (15.38%); and blepharitis/blepharospasm (12.43%). The regular dosage was every 3 or 4 hours (40.46%). 21.97% patients used the AS in one eye only. The mean length of treatment was 2.71 years. All patients, except one, improved their symptoms with the treatment and no one suffered harmful effects. CONCLUSIONS: Numerous national and international guidelines on dry eye treatment have been published, but they differ in dosing, concentration and indication of AS eye drops. Consequently, there is no consensus about the best therapy with AS. In this article we describe the clinical practice of AS eye drops. In the study, indications for AS therapy were mostly: corneal diseases; Sjögren syndrome; and dry eye resulting from autoimmune disease; and blepharitis or blepharospasm. Patients went to the hospital pharmacy to pick up AS eye drops before 90 days, it ensures the stability of eye drops. AS is an effective, safe and well tolerated treatment.

Intranasal bevacizumab treatment on epistaxis in hereditary haemorrhagic telangiectasia: a case report.

Hereditary haemorrhagic telangiectasia (HHT), also known as Osler-Weber-Rendu disease, is a rare, vascular, autosomal dominant disorder. The purpose of this paper is to describe the efficacy and safety of treatment with intranasal bevacizumab in HHT. A 42-year-old woman with HHT presented with frequent episodes of epistaxis. Iron studies showed anaemia of iron deficiency from chronic blood loss. Because of the frequent epistaxis (Epistaxis Severity Score (ESS) 6.76) and varying haemoglobin levels (Hb range: 7.7-9.9g/dL) her doctors sought treatment with intranasal bevacizumab. This treatment was prescribed at the hospital pharmacy department in a laminar flow hood. 2.5 mL (25 mg) were placed in a nasal spray bottle. The recommended dosage was twice a day for two consecutive months. Nasal treatment seemed to control her epistaxis, and no adverse effects were reported. She only had a few further minor episodes of epistaxis, which were easily controlled (ESS 3.44). The haemoglobin levels evreached normal levels (Hb range: 12.8-14.1g/dL).

Oncology Patient Interest in the Use of New Technologies to Manage Their Disease: Cross-Sectional Survey.

BACKGROUND: Information and communication technologies (ICTs) in oncology can revolutionize the medical care of cancer patients. ICTs can promote patients' empowerment and real-time disease monitoring. There is limited information about the impact of ICTs in cancer patients or their level of interest in using these tools for greater management of their condition. OBJECTIVE: This study aimed to understand the ICT usage profile in hematology-oncology patients to identify their needs and determine their level of interest in these technologies as a means of managing their disease. METHODS: A 28-item questionnaire was drawn up by a multidisciplinary team including pharmacists and oncologists. The questions were organized into 3 blocks, which were as follows: block A-sociodemographic characteristics; block B-use of ICTs when searching for health-related information; and block C-usage preferences for health apps. Hematology-oncology patients receiving treatment between May and July 2017 were included. A paper copy of the questionnaire was handed over to patients in either the day hospital or the pharmaceutical care consultancy in pharmacy services. RESULTS: A total of 650 questionnaires were handed out, with a participation of 94.0% (611/650). Patient sociodemographic characteristics were as follows: mean age was 57.8 years (age range: 19-91). Of 611 participants, 40.7% (249/611) had a university education, and 45.1% (276/611) of participants reported their overall state of health to be good. Results from use of ICTs when searching for health-related information were as follows: 87.1% (532/611) of participants were interested in being informed about health-related matters. Of all participants, 75.5% (532/611) sought information from health professionals and 61.3% (375/611) on the internet. Before going to their doctor's appointment, 21.8% (133/611) of patients looked up information about their disease or treatment on the internet. This access to the internet rose to 50.9% (311/611) after their first medical appointment with their oncologist. Usage preferences for health apps were as follows: 82.7% (505/611) had a smartphone, whereas 20.3% (124/611) had a health app installed. Overall, 81.5% (498/611) would use an app if their health professional recommended it to them, but 39.6% (242/611) were not willing to pay for it. CONCLUSIONS: The hematology-oncology patients showed a great deal of interest in searching for health-related information by means of ICTs, especially using smartphones and apps. The issues that drew the most interest in terms of apps were appointment management, advice on disease management, and communication with health professionals. Free access to these features and the recommendation by a health professional are important factors when it comes to their use. Therefore, the health care provider is a key element in the recommendation of ICTs, providing their knowledge and experience concerning their correct usage.

Association between clinical factors and dose modification strategies in the treatment with ustekinumab for moderate-to-severe plaque psoriasis.

PURPOSE: The aim of this study was to identify clinical factors associated with dose reduction and dose escalation in the treatment with ustekinumab in patients with moderate-to-severe plaque psoriasis. MATERIALS AND METHODS: An observational, longitudinal and retrospective study was conducted using patients with moderate-to-severe plaque psoriasis. We reviewed clinical histories and variables were recorded on a database (patients' characteristics, pharmacotherapeutics, effectiveness and safety). We evaluated correlation between dose reduction, dose escalation and used dose with other variables. RESULTS: Of the study's 62 patients, Ustekinumab dose was adjusted in 45.2% (22.6% with reduced doses and 22.6% with increased doses). We found a statistically significant correlation between extending the dosing interval and the absence of psoriatic arthritis, no concomitant systemic therapies, treatment time with ustekinumab, lower PASI at week 28 and achieving PASI75 at week 28. There was also a statistically significant correlation between dose escalation and diabetes mellitus, psoriatic arthritis, prior biological treatments, concomitant systemic therapies, concomitant phototherapy and not achieving PASI75 at week 28. CONCLUSIONS: Dose-reduction strategies would increase ustekinumab efficiency in patients that achieve PASI 75 without psoriatic arthritis, diabetes mellitus, previous BT and concomitant treatment with conventional systemic drugs.

Linfohistiocitosis hemofagocítica: análisis de 18 casos / Hemophagocytic lymphohistiocytosis: Analysis of 18 cases

Antecedentes y objetivo: La hemophagocytic lymphohistiocytosis (HLH, «linfohistiocitosis hemofagocítica») es una entidad grave, producida por una incorrecta regulación de la respuesta inmunológica frente a diversos estímulos del sistema inmunitario. Su diagnóstico y tratamiento precoz suponen un reto para el clínico. Pacientes y método: Hemos realizado un estudio descriptivo retrospectivo de los pacientes adultos diagnosticados de HLH, según los criterios de la Histiocyte Society, entre los años 2010 y 2015 en nuestra institución, analizando sus características clínicas, el estudio diagnóstico-etiológico y su evolución. Resultados: Se analizaron 18 pacientes. La mediana de tiempo al diagnóstico fue de 24 días. La etiología fue neoplásica en 8 casos (hematológica en 7), infecciosa en 6 (leishmaniasis visceral en 4), inflamatoria en uno, y en los 3 restantes, idiopática. Se realizó tratamiento en 16 pacientes con corticoides, asociando ciclosporina en 2, inmunoglobulinas en uno, y etopósido con tacrolimus en otro. Conclusiones: Destacamos la escasa utilización de etopósido en el tratamiento dirigido, el actualmente recomendado. La mortalidad global fue del 44%, asociada a la etiología neoplásica principalmente (67 frente a 16,6% de mortalidad en la etiología infecciosa, p < 0,05) (AU)

Background and objective: Hemophagocytic lymphohistiocytosis (HLH) is a serious condition, caused by an improper regulation of the immune response to different stimuli of the immune system. Early diagnosis and treatment are a challenge for the clinician. Patients and method: We conducted a retrospective study at our institution between 2010 and 2015, of adult patients diagnosed with HLH, in accordance with the criteria of the Histiocyte Society, analyzing their clinical characteristics, diagnostic and etiological studies and the outcome. Results: Eighteen patients were analyzed. Median time to diagnosis was 24 days. We found neoplastic etiology in 8 cases (7 hematologic), while it was infection-related in 6 (4 visceral leishmaniasis), and an inflammatory disease in one. In the remaining 3, an underlying cause for the HLH was not found. Course of treatment was corticosteroids in 16 patients, associated with cyclosporine in 2 of them, one received immunoglobulins, while another received etoposide with tacrolimus. Conclusions: We emphasize the scarce use of etoposide therapy, the currently recommended treatment. Overall mortality was 44%, mainly associated with neoplastic etiology (67 compared to 16.6% mortality in infection-related etiology, P < 0,05) (AU)

[Hemophagocytic lymphohistiocytosis: Analysis of 18 cases]. / Linfohistiocitosis hemofagocítica: análisis de 18 casos.

BACKGROUND AND OBJECTIVE: Hemophagocytic lymphohistiocytosis (HLH) is a serious condition, caused by an improper regulation of the immune response to different stimuli of the immune system. Early diagnosis and treatment are a challenge for the clinician. PATIENTS AND METHOD: We conducted a retrospective study at our institution between 2010 and 2015, of adult patients diagnosed with HLH, in accordance with the criteria of the Histiocyte Society, analyzing their clinical characteristics, diagnostic and etiological studies and the outcome. RESULTS: Eighteen patients were analyzed. Median time to diagnosis was 24 days. We found neoplastic etiology in 8 cases (7 hematologic), while it was infection-related in 6 (4 visceral leishmaniasis), and an inflammatory disease in one. In the remaining 3, an underlying cause for the HLH was not found. Course of treatment was corticosteroids in 16 patients, associated with cyclosporine in 2 of them, one received immunoglobulins, while another received etoposide with tacrolimus. CONCLUSIONS: We emphasize the scarce use of etoposide therapy, the currently recommended treatment. Overall mortality was 44%, mainly associated with neoplastic etiology (67 compared to 16.6% mortality in infection-related etiology, P<.05).

Alveolar graft in the cleft lip and palate patient: Review of 104 cases

INTRODUCTION: Alveolar bone grafting is a vital part of the rehabilitation of cleft patients. The factors that have been most frequently associated with the success of the graft are the age at grafting and the pre-grafting orthodontic treatment.OBJECTIVES:1) Describe the cases of alveolar bone grafts performed at the Maxilofacial Unit of Hospital Sant Joan de Déu, Barcelona (HSJD); and 2) Analyze the success/failure of alveolar grafts and related variables. MATERIAL AND METHODS: Descriptive retrospective study using a sample of 104 patients who underwent a secondary alveolar graft at the Craniofacial Unit of HSJD between 1998 and 2012. The graft was done by the same surgeon in all patients using bone from the iliac crest. RESULTS:70% of the patients underwent the procedure before the age of 15 (median 14.45 years); 70% of the graft patients underwent pre-graft maxillary expansion. A total of 100 cases were recorded as successful (median age of 14.58 years, 68 underwent pre-graft expansion) and only 4 were recorded as failures (median age of 17.62 years, 3 underwent pre-graft expansion). We did not find statistically significant differences in age at the time of grafting or pre-surgical expansion when comparing the success and failure groups. We found the success rate of the graft to be 96.2%. CONCLUSIONS: The number of failures was too small to establish a statistically significant conclusion in our sample regarding the age at grafting and pre-grafting expansion. The use of alveolar bone grafting from the iliac crest has a very high success rate with a very low incidence of complications. Existing controversies regarding secondary bone grafting and the wide range of success rates found in the literature suggest that it is necessary to establish a specific treatment protocol that ensures the success of this procedure

Alveolar graft in the cleft lip and palate patient: review of 104 cases.

INTRODUCTION: Alveolar bone grafting is a vital part of the rehabilitation of cleft patients. The factors that have been most frequently associated with the success of the graft are the age at grafting and the pre-grafting orthodontic treatment. OBJECTIVES: 1) Describe the cases of alveolar bone grafts performed at the Maxilofacial Unit of Hospital Sant Joan de Déu, Barcelona (HSJD); and 2) Analyze the success/failure of alveolar grafts and related variables. MATERIAL AND METHODS: Descriptive retrospective study using a sample of 104 patients who underwent a secondary alveolar graft at the Craniofacial Unit of HSJD between 1998 and 2012. The graft was done by the same surgeon in all patients using bone from the iliac crest. RESULTS: 70% of the patients underwent the procedure before the age of 15 (median 14.45 years); 70% of the graft patients underwent pre-graft maxillary expansion. A total of 100 cases were recorded as successful (median age of 14.58 years, 68 underwent pre-graft expansion) and only 4 were recorded as failures (median age of 17.62 years, 3 underwent pre-graft expansion). We did not find statistically significant differences in age at the time of grafting or pre-surgical expansion when comparing the success and failure groups. We found the success rate of the graft to be 96.2%. CONCLUSIONS: The number of failures was too small to establish a statistically significant conclusion in our sample regarding the age at grafting and pre-grafting expansion. The use of alveolar bone grafting from the iliac crest has a very high success rate with a very low incidence of complications. Existing controversies regarding secondary bone grafting and the wide range of success rates found in the literature suggest that it is necessary to establish a specific treatment protocol that ensures the success of this procedure.

Enzymatic re-esterification of lower glycerides from soybean oil with conjugated linoleic acid (CLA).

New structured lipids essentially free of saturated fatty acids and rich in essential fatty acids and CLA were prepared from soybean oil using a selective enzymatic procedure of synthesis. Saturated fatty acids originally present in the oil were selectively removed in a selective alcoholysis step. Enzymatic re-esterification with conjugated linoleic acid (CLA) of lower glycerides (di- and monoglycerides) obtained from soybean oil was studied using several commercially available lipases. Higher maximum reaction conversions were obtained with the free acid form of CLA than with the corresponding ethyl ester. Reactions with Novozym 435 were fastest, producing 84% diacylglycerols (DAG) in 0.5 h of reaction at 60 degrees C. For Lipozyme RM IM the maximum yields of triacylglycerols (TAG) were achieved at 60 degrees C (43% in 4.5 h) and 25 degrees C (43% TAG in 7 h). The dominant species in DAG-rich products were LnL and LL. TAG-rich products obtained with Lipozyme RM IM had LLL and LLO/OLO as their predominant TAG. Quantitative conversions to DAG were obtained in 3-4.5 h with 10% (w/w) Lipase G 50 at 60 degrees C and a molar ratio of free CLA to hydroxyl groups of 5:1.

Different enzyme requirements for the synthesis of biodiesel: Novozym 435 and Lipozyme TL IM.

Enzymatic syntheses of biodiesel via alcoholysis of different vegetable oils (sunflower, borage, olive and soybean) have been studied. Loss of lipase activity induced by the nucleophile is greater with methanol than with ethanol, and is greater for Lipozyme TL IM than for Novozym 435. The optimum volume of ethanol depends on the loading of solid biocatalyst and is higher for preparations of Novozym 435 than for Lipozyme TL IM. Maximum rates were obtained with Lipozyme TL IM, for a molar ratio of alcohol to FA residues of 0.33. By contrast, Novozym 435 requires at least a 2:1 ratio. Alcoholysis of the vegetable oils is faster with Lipozyme TL IM than with Novozym 435. Use of a high loading of Novozym 435 (50% w/w) and a large molar excess of ethanol are required to obtain an initial rate similar to that obtained with Lipozyme TL IM at a lower enzyme loading (10% w/w) and an equimolar ratio of ethanol and FA residues. Novozym 435 produces quantitative conversions in only 7h at 25 degrees C, but complete conversions are not obtained with Lipozyme TL IM. Three stage stepwise addition of ethanol yields 84% conversion to ethyl esters for Lipozyme TL IM. Hence use of Novozym 435 is preferred. After nine cycles in a batch reactor Novozym 435 retained 85% of its initial activity.

Continuous enzymatic transesterification of sesame oil and a fully hydrogenated fat: effects of reaction conditions on product characteristics.

An immobilized lipase from Thermomyces lanuginosus (TL IM) was employed to mediate the continuous transesterification of sesame oil and fully hydrogenated soybean oil (FHSBO) in a packed-bed reactor operating at 70 degrees C. Reactions between sesame oil (rich in LLL (15.97%), LOL (31.56%), and OLO (21.15%) [L = linoleic; O = oleic]) and the fully hydrogenated fat ((73.7% SSS, 26.3% SPS) [S = stearic; P = palmitic]) produced semi-solid fats. These products are complex mixtures of triacylglycerol (TAG) species whose compositions depend on reaction conditions. The dependence of the steady state product TAG profile on space time was determined for four initial weight ratios of sesame oil to hydrogenated fat (90:10, 80:20, 70:30, and 60:40). Except for the trial involving a weight ratio of sesame oil to FHSBO of 60:40, near equilibrium conditions were achieved at space times of 30 min-1 h. The chemical, physical, and functional properties of the product semi-solid fats were characterized. The predominant TAG species in the quasi-equilibrium products obtained from the mixture initially containing 90% (w/w) sesame oil and 10% FHSBO were LOL (26.22%) and OLO (21.92%). For transesterification of 80% sesame oil and 20% FHSBO, the major product species were OOP (21.27%), LOL (17.46%), and OLO (13.93%). OOP (24.38%) was the major product for reaction of 70% sesame oil with 30% FHSBO. Appropriate choices of reaction conditions and initial ratios of sesame oil to FHSBO lead to TAG with melting profiles and solid fat contents (SFC) similar to those of a variety of commercial products.